/*
- * liblttngctl.c
+ * lttng-ctl.c
*
* Linux Trace Toolkit Control Library
*
- * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2011 EfficiOS Inc.
+ * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
*
- * This library is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License, version 2.1 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: LGPL-2.1-only
*
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
#include <assert.h>
#include <grp.h>
-#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
+#include <stdint.h>
#include <string.h>
#include <unistd.h>
+#include <common/bytecode/bytecode.h>
#include <common/common.h>
+#include <common/compat/errno.h>
+#include <common/compat/string.h>
#include <common/defaults.h>
+#include <common/dynamic-array.h>
+#include <common/dynamic-buffer.h>
+#include <common/payload-view.h>
+#include <common/payload.h>
#include <common/sessiond-comm/sessiond-comm.h>
+#include <common/tracker.h>
+#include <common/unix.h>
#include <common/uri.h>
+#include <common/utils.h>
+#include <lttng/channel-internal.h>
+#include <lttng/destruction-handle.h>
+#include <lttng/endpoint.h>
+#include <lttng/error-query-internal.h>
+#include <lttng/event-internal.h>
+#include <lttng/health-internal.h>
+#include <lttng/lttng-error.h>
#include <lttng/lttng.h>
+#include <lttng/session-descriptor-internal.h>
+#include <lttng/session-internal.h>
+#include <lttng/trigger/trigger-internal.h>
+#include <lttng/userspace-probe-internal.h>
+
+#include "lttng-ctl-helper.h"
+#include <common/filter/filter-ast.h>
+#include <common/filter/filter-parser.h>
+#include <common/filter/memstream.h>
-#include "filter/filter-ast.h"
-#include "filter/filter-parser.h"
-#include "filter/filter-bytecode.h"
-#include "filter/memstream.h"
-
-#ifdef DEBUG
-static const int print_xml = 1;
-#define dbg_printf(fmt, args...) \
- printf("[debug liblttng-ctl] " fmt, ## args)
-#else
-static const int print_xml = 0;
-#define dbg_printf(fmt, args...) \
+#define COPY_DOMAIN_PACKED(dst, src) \
do { \
- /* do nothing but check printf format */ \
- if (0) \
- printf("[debug liblttnctl] " fmt, ## args); \
+ struct lttng_domain _tmp_domain; \
+ \
+ lttng_ctl_copy_lttng_domain(&_tmp_domain, &src); \
+ dst = _tmp_domain; \
} while (0)
-#endif
-
/* Socket to session daemon for communication */
-static int sessiond_socket;
+static int sessiond_socket = -1;
static char sessiond_sock_path[PATH_MAX];
-static char health_sock_path[PATH_MAX];
/* Variables */
static char *tracing_group;
*/
int lttng_opt_quiet;
int lttng_opt_verbose;
-
-static void set_default_url_attr(struct lttng_uri *uri,
- enum lttng_stream_type stype)
-{
- uri->stype = stype;
- if (uri->dtype != LTTNG_DST_PATH && uri->port == 0) {
- uri->port = (stype == LTTNG_STREAM_CONTROL) ?
- DEFAULT_NETWORK_CONTROL_PORT : DEFAULT_NETWORK_DATA_PORT;
- }
-}
-
-/*
- * Parse a string URL and creates URI(s) returning the size of the populated
- * array.
- */
-static ssize_t parse_str_urls_to_uri(const char *ctrl_url, const char *data_url,
- struct lttng_uri **uris)
-{
- int ret;
- unsigned int equal = 1, idx = 0;
- /* Add the "file://" size to the URL maximum size */
- char url[PATH_MAX + 7];
- ssize_t size_ctrl = 0, size_data = 0, size;
- struct lttng_uri *ctrl_uris = NULL, *data_uris = NULL;
- struct lttng_uri *tmp_uris = NULL;
-
- /* No URL(s) is allowed. This means that the consumer will be disabled. */
- if (ctrl_url == NULL && data_url == NULL) {
- return 0;
- }
-
- /* Check if URLs are equal and if so, only use the control URL */
- if (ctrl_url && data_url) {
- equal = !strcmp(ctrl_url, data_url);
- }
-
- /*
- * Since we allow the str_url to be a full local filesystem path, we are
- * going to create a valid file:// URL if it's the case.
- *
- * Check if first character is a '/' or else reject the URL.
- */
- if (ctrl_url && ctrl_url[0] == '/') {
- ret = snprintf(url, sizeof(url), "file://%s", ctrl_url);
- if (ret < 0) {
- PERROR("snprintf file url");
- goto parse_error;
- }
- ctrl_url = url;
- }
-
- /* Parse the control URL if there is one */
- if (ctrl_url) {
- size_ctrl = uri_parse(ctrl_url, &ctrl_uris);
- if (size_ctrl < 1) {
- ERR("Unable to parse the URL %s", ctrl_url);
- goto parse_error;
- }
-
- /* At this point, we know there is at least one URI in the array */
- set_default_url_attr(&ctrl_uris[0], LTTNG_STREAM_CONTROL);
-
- if (ctrl_uris[0].dtype == LTTNG_DST_PATH && data_url) {
- ERR("Can not have a data URL when destination is file://");
- goto error;
- }
-
- /* URL are not equal but the control URL uses a net:// protocol */
- if (size_ctrl == 2) {
- if (!equal) {
- ERR("Control URL uses the net:// protocol and the data URL is "
- "different. Not allowed.");
- goto error;
- } else {
- set_default_url_attr(&ctrl_uris[1], LTTNG_STREAM_DATA);
- /*
- * The data_url and ctrl_url are equal and the ctrl_url
- * contains a net:// protocol so we just skip the data part.
- */
- data_url = NULL;
- }
- }
- }
-
- if (data_url) {
- /* We have to parse the data URL in this case */
- size_data = uri_parse(data_url, &data_uris);
- if (size_data < 1) {
- ERR("Unable to parse the URL %s", data_url);
- goto error;
- } else if (size_data == 2) {
- ERR("Data URL can not be set with the net[4|6]:// protocol");
- goto error;
- }
-
- set_default_url_attr(&data_uris[0], LTTNG_STREAM_DATA);
- }
-
- /* Compute total size */
- size = size_ctrl + size_data;
-
- tmp_uris = zmalloc(sizeof(struct lttng_uri) * size);
- if (tmp_uris == NULL) {
- PERROR("zmalloc uris");
- goto error;
- }
-
- if (ctrl_uris) {
- /* It's possible the control URIs array contains more than one URI */
- memcpy(tmp_uris, ctrl_uris, sizeof(struct lttng_uri) * size_ctrl);
- ++idx;
- }
-
- if (data_uris) {
- memcpy(&tmp_uris[idx], data_uris, sizeof(struct lttng_uri));
- }
-
- *uris = tmp_uris;
-
- return size;
-
-error:
- free(ctrl_uris);
- free(data_uris);
- free(tmp_uris);
-parse_error:
- return -1;
-}
-
-/*
- * Copy string from src to dst and enforce null terminated byte.
- */
-static void copy_string(char *dst, const char *src, size_t len)
-{
- if (src && dst) {
- strncpy(dst, src, len);
- /* Enforce the NULL terminated byte */
- dst[len - 1] = '\0';
- } else if (dst) {
- dst[0] = '\0';
- }
-}
+int lttng_opt_mi;
/*
* Copy domain to lttcomm_session_msg domain.
*
* If domain is unknown, default domain will be the kernel.
*/
-static void copy_lttng_domain(struct lttng_domain *dst, struct lttng_domain *src)
+LTTNG_HIDDEN
+void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
+ struct lttng_domain *src)
{
if (src && dst) {
switch (src->type) {
case LTTNG_DOMAIN_KERNEL:
case LTTNG_DOMAIN_UST:
- /*
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- */
+ case LTTNG_DOMAIN_JUL:
+ case LTTNG_DOMAIN_LOG4J:
+ case LTTNG_DOMAIN_PYTHON:
memcpy(dst, src, sizeof(struct lttng_domain));
break;
default:
goto end;
}
- DBG("LSM cmd type : %d", lsm->cmd_type);
+ DBG("LSM cmd type: '%s' (%d)", lttcomm_sessiond_command_str(lsm->cmd_type),
+ lsm->cmd_type);
ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
sizeof(struct lttcomm_session_msg));
* On success, returns the number of bytes sent (>=0)
* On error, returns -1
*/
-static int send_session_varlen(void *data, size_t len)
+static int send_session_varlen(const void *data, size_t len)
{
int ret;
return ret;
}
+/*
+ * Send file descriptors to the session daemon.
+ *
+ * On success, returns the number of bytes sent (>=0)
+ * On error, returns -1
+ */
+static int send_session_fds(const int *fds, size_t nb_fd)
+{
+ int ret;
+
+ if (!connected) {
+ ret = -LTTNG_ERR_NO_SESSIOND;
+ goto end;
+ }
+
+ if (!fds || !nb_fd) {
+ ret = 0;
+ goto end;
+ }
+
+ ret = lttcomm_send_fds_unix_sock(sessiond_socket, fds, nb_fd);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_FATAL;
+ }
+
+end:
+ return ret;
+}
+
/*
* Receive data from the sessiond socket.
*
* On success, returns the number of bytes received (>=0)
- * On error, returns -1 (recvmsg() error) or -ENOTCONN
+ * On error, returns a negative lttng_error_code.
*/
static int recv_data_sessiond(void *buf, size_t len)
{
int ret;
+ assert(len > 0);
+
if (!connected) {
ret = -LTTNG_ERR_NO_SESSIOND;
goto end;
ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
if (ret < 0) {
ret = -LTTNG_ERR_FATAL;
+ } else if (ret == 0) {
+ ret = -LTTNG_ERR_NO_SESSIOND;
+ }
+
+end:
+ return ret;
+}
+
+/*
+ * Receive a payload from the session daemon by appending to an existing
+ * payload.
+ * On success, returns the number of bytes received (>=0)
+ * On error, returns a negative lttng_error_code.
+ */
+static int recv_payload_sessiond(struct lttng_payload *payload, size_t len)
+{
+ int ret;
+ const size_t original_payload_size = payload->buffer.size;
+
+ ret = lttng_dynamic_buffer_set_size(
+ &payload->buffer, payload->buffer.size + len);
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
}
+ ret = recv_data_sessiond(
+ payload->buffer.data + original_payload_size, len);
end:
return ret;
}
/*
- * Check if we are in the specified group.
+ * Check if we are in the specified group.
*
- * If yes return 1, else return -1.
+ * If yes return 1, else return -1.
*/
-static int check_tracing_group(const char *grp_name)
+LTTNG_HIDDEN
+int lttng_check_tracing_group(void)
{
- struct group *grp_tracing; /* no free(). See getgrnam(3) */
- gid_t *grp_list;
+ gid_t *grp_list, tracing_gid;
int grp_list_size, grp_id, i;
int ret = -1;
+ const char *grp_name = tracing_group;
/* Get GID of group 'tracing' */
- grp_tracing = getgrnam(grp_name);
- if (!grp_tracing) {
+ if (utils_get_group_id(grp_name, false, &tracing_gid)) {
/* If grp_tracing is NULL, the group does not exist. */
goto end;
}
/* Get number of supplementary group IDs */
grp_list_size = getgroups(0, NULL);
if (grp_list_size < 0) {
- perror("getgroups");
+ PERROR("getgroups");
goto end;
}
/* Alloc group list of the right size */
- grp_list = malloc(grp_list_size * sizeof(gid_t));
+ grp_list = zmalloc(grp_list_size * sizeof(gid_t));
if (!grp_list) {
- perror("malloc");
+ PERROR("malloc");
goto end;
}
grp_id = getgroups(grp_list_size, grp_list);
if (grp_id < 0) {
- perror("getgroups");
+ PERROR("getgroups");
goto free_list;
}
for (i = 0; i < grp_list_size; i++) {
- if (grp_list[i] == grp_tracing->gr_gid) {
+ if (grp_list[i] == tracing_gid) {
ret = 1;
break;
}
return ret;
}
+static enum lttng_error_code check_enough_available_memory(
+ uint64_t num_bytes_requested_per_cpu)
+{
+ int ret;
+ enum lttng_error_code ret_code;
+ long num_cpu;
+ uint64_t best_mem_info;
+ uint64_t num_bytes_requested_total;
+
+ /*
+ * Get the number of CPU currently online to compute the amount of
+ * memory needed to create a buffer for every CPU.
+ */
+ num_cpu = sysconf(_SC_NPROCESSORS_ONLN);
+ if (num_cpu == -1) {
+ ret_code = LTTNG_ERR_FATAL;
+ goto end;
+ }
+
+ if (num_bytes_requested_per_cpu > UINT64_MAX / (uint64_t) num_cpu) {
+ /* Overflow */
+ ret_code = LTTNG_ERR_OVERFLOW;
+ goto end;
+ }
+
+ num_bytes_requested_total =
+ num_bytes_requested_per_cpu * (uint64_t) num_cpu;
+
+ /*
+ * Try to get the `MemAvail` field of `/proc/meminfo`. This is the most
+ * reliable estimate we can get but it is only exposed by the kernel
+ * since 3.14. (See Linux kernel commit:
+ * 34e431b0ae398fc54ea69ff85ec700722c9da773)
+ */
+ ret = utils_get_memory_available(&best_mem_info);
+ if (ret >= 0) {
+ goto success;
+ }
+
+ /*
+ * As a backup plan, use `MemTotal` field of `/proc/meminfo`. This
+ * is a sanity check for obvious user error.
+ */
+ ret = utils_get_memory_total(&best_mem_info);
+ if (ret >= 0) {
+ goto success;
+ }
+
+ /* No valid source of information. */
+ ret_code = LTTNG_ERR_NOMEM;
+ goto end;
+
+success:
+ if (best_mem_info >= num_bytes_requested_total) {
+ ret_code = LTTNG_OK;
+ } else {
+ ret_code = LTTNG_ERR_NOMEM;
+ }
+end:
+ return ret_code;
+}
+
/*
* Try connect to session daemon with sock_path.
*
ret = lttcomm_connect_unix_sock(sock_path);
if (ret < 0) {
- /* Not alive */
+ /* Not alive. */
goto error;
}
ret = lttcomm_close_unix_sock(ret);
if (ret < 0) {
- perror("lttcomm_close_unix_sock");
+ PERROR("lttcomm_close_unix_sock");
}
return 0;
*/
static int set_session_daemon_path(void)
{
- int ret;
- int in_tgroup = 0; /* In tracing group */
+ int in_tgroup = 0; /* In tracing group. */
uid_t uid;
uid = getuid();
if (uid != 0) {
/* Are we in the tracing group ? */
- in_tgroup = check_tracing_group(tracing_group);
+ in_tgroup = lttng_check_tracing_group();
}
- if ((uid == 0) || in_tgroup) {
- copy_string(sessiond_sock_path, DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
+ if ((uid == 0) || in_tgroup == 1) {
+ const int ret = lttng_strncpy(sessiond_sock_path,
+ DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
sizeof(sessiond_sock_path));
+
+ if (ret) {
+ goto error;
+ }
}
if (uid != 0) {
+ int ret;
+
if (in_tgroup) {
- /* Tracing group */
+ /* Tracing group. */
ret = try_connect_sessiond(sessiond_sock_path);
if (ret >= 0) {
goto end;
/* ...or not in tracing group (and not root), default */
/*
- * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
- * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
+ * With GNU C < 2.1, snprintf returns -1 if the target buffer
+ * is too small;
+ * With GNU C >= 2.1, snprintf returns the required size
+ * (excluding closing null)
*/
ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
- DEFAULT_HOME_CLIENT_UNIX_SOCK, getenv("HOME"));
+ DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
goto error;
}
}
/*
- * Connect to the LTTng session daemon.
+ * Connect to the LTTng session daemon.
*
- * On success, return 0. On error, return -1.
+ * On success, return the socket's file descriptor. On error, return -1.
*/
-static int connect_sessiond(void)
+LTTNG_HIDDEN int connect_sessiond(void)
{
int ret;
goto error;
}
- /* Connect to the sesssion daemon */
+ /* Connect to the sesssion daemon. */
ret = lttcomm_connect_unix_sock(sessiond_sock_path);
if (ret < 0) {
goto error;
}
- sessiond_socket = ret;
- connected = 1;
-
- return 0;
+ return ret;
error:
return -1;
}
+static void reset_global_sessiond_connection_state(void)
+{
+ sessiond_socket = -1;
+ connected = 0;
+}
+
/*
* Clean disconnect from the session daemon.
+ *
* On success, return 0. On error, return -1.
*/
static int disconnect_sessiond(void)
if (connected) {
ret = lttcomm_close_unix_sock(sessiond_socket);
- sessiond_socket = 0;
- connected = 0;
+ reset_global_sessiond_connection_state();
+ }
+
+ return ret;
+}
+
+static int recv_sessiond_optional_data(size_t len, void **user_buf,
+ size_t *user_len)
+{
+ int ret = 0;
+ void *buf = NULL;
+
+ if (len) {
+ if (!user_len) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ buf = zmalloc(len);
+ if (!buf) {
+ ret = -ENOMEM;
+ goto end;
+ }
+
+ ret = recv_data_sessiond(buf, len);
+ if (ret < 0) {
+ goto end;
+ }
+
+ if (!user_buf) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /* Move ownership of command header buffer to user. */
+ *user_buf = buf;
+ buf = NULL;
+ *user_len = len;
+ } else {
+ /* No command header. */
+ if (user_len) {
+ *user_len = 0;
+ }
+
+ if (user_buf) {
+ *user_buf = NULL;
+ }
}
+end:
+ free(buf);
return ret;
}
/*
* Ask the session daemon a specific command and put the data into buf.
- * Takes extra var. len. data as input to send to the session daemon.
+ * Takes extra var. len. data and file descriptors as input to send to the
+ * session daemon.
*
* Return size of data (only payload, not header) or a negative error code.
*/
-static int ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
- void *vardata, size_t varlen, void **buf)
+LTTNG_HIDDEN
+int lttng_ctl_ask_sessiond_fds_varlen(struct lttcomm_session_msg *lsm,
+ const int *fds, size_t nb_fd, const void *vardata,
+ size_t vardata_len, void **user_payload_buf,
+ void **user_cmd_header_buf, size_t *user_cmd_header_len)
{
int ret;
- size_t size;
- void *data = NULL;
+ size_t payload_len;
struct lttcomm_lttng_msg llm;
ret = connect_sessiond();
if (ret < 0) {
ret = -LTTNG_ERR_NO_SESSIOND;
goto end;
+ } else {
+ sessiond_socket = ret;
+ connected = 1;
}
- /* Send command to session daemon */
ret = send_session_msg(lsm);
if (ret < 0) {
/* Ret value is a valid lttng error code. */
goto end;
}
/* Send var len data */
- ret = send_session_varlen(vardata, varlen);
+ ret = send_session_varlen(vardata, vardata_len);
+ if (ret < 0) {
+ /* Ret value is a valid lttng error code. */
+ goto end;
+ }
+
+ /* Send fds */
+ ret = send_session_fds(fds, nb_fd);
if (ret < 0) {
/* Ret value is a valid lttng error code. */
goto end;
goto end;
}
- size = llm.data_size;
- if (size == 0) {
- /* If client free with size 0 */
- if (buf != NULL) {
- *buf = NULL;
- }
- ret = 0;
+ /* Get command header from data transmission */
+ ret = recv_sessiond_optional_data(llm.cmd_header_size,
+ user_cmd_header_buf, user_cmd_header_len);
+ if (ret < 0) {
+ goto end;
+ }
+
+ /* Get payload from data transmission */
+ ret = recv_sessiond_optional_data(llm.data_size, user_payload_buf,
+ &payload_len);
+ if (ret < 0) {
+ goto end;
+ }
+
+ ret = llm.data_size;
+
+end:
+ disconnect_sessiond();
+ return ret;
+}
+
+LTTNG_HIDDEN
+int lttng_ctl_ask_sessiond_payload(struct lttng_payload_view *message,
+ struct lttng_payload *reply)
+{
+ int ret;
+ struct lttcomm_lttng_msg llm;
+ const int fd_count = lttng_payload_view_get_fd_handle_count(message);
+
+ assert(reply->buffer.size == 0);
+ assert(lttng_dynamic_pointer_array_get_count(&reply->_fd_handles) == 0);
+
+ ret = connect_sessiond();
+ if (ret < 0) {
+ ret = -LTTNG_ERR_NO_SESSIOND;
+ goto end;
+ } else {
+ sessiond_socket = ret;
+ connected = 1;
+ }
+
+ /* Send command to session daemon */
+ ret = lttcomm_send_creds_unix_sock(sessiond_socket, message->buffer.data,
+ message->buffer.size);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_FATAL;
goto end;
}
- data = (void*) malloc(size);
+ if (fd_count > 0) {
+ ret = lttcomm_send_payload_view_fds_unix_sock(sessiond_socket,
+ message);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_FATAL;
+ goto end;
+ }
+ }
- /* Get payload data */
- ret = recv_data_sessiond(data, size);
+ /* Get header from data transmission */
+ ret = recv_payload_sessiond(reply, sizeof(llm));
if (ret < 0) {
- free(data);
+ /* Ret value is a valid lttng error code. */
goto end;
}
- /*
- * Extra protection not to dereference a NULL pointer. If buf is NULL at
- * this point, an error is returned and data is freed.
- */
- if (buf == NULL) {
- ret = -LTTNG_ERR_INVALID;
- free(data);
+ llm = *((typeof(llm) *) reply->buffer.data);
+
+ /* Check error code if OK */
+ if (llm.ret_code != LTTNG_OK) {
+ if (llm.ret_code < LTTNG_OK || llm.ret_code >= LTTNG_ERR_NR) {
+ /* Invalid error code received. */
+ ret = -LTTNG_ERR_UNK;
+ } else {
+ ret = -llm.ret_code;
+ }
goto end;
}
- *buf = data;
- ret = size;
+ if (llm.cmd_header_size > 0) {
+ ret = recv_payload_sessiond(reply, llm.cmd_header_size);
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ /* Get command header from data transmission */
+ if (llm.data_size > 0) {
+ ret = recv_payload_sessiond(reply, llm.data_size);
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ if (llm.fd_count > 0) {
+ ret = lttcomm_recv_payload_fds_unix_sock(
+ sessiond_socket, llm.fd_count, reply);
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ /* Don't return the llm header to the caller. */
+ memmove(reply->buffer.data, reply->buffer.data + sizeof(llm),
+ reply->buffer.size - sizeof(llm));
+ ret = lttng_dynamic_buffer_set_size(
+ &reply->buffer, reply->buffer.size - sizeof(llm));
+ if (ret) {
+ /* Can't happen as size is reduced. */
+ abort();
+ }
+
+ ret = reply->buffer.size;
end:
disconnect_sessiond();
return ret;
}
-/*
- * Ask the session daemon a specific command and put the data into buf.
- *
- * Return size of data (only payload, not header) or a negative error code.
- */
-static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
-{
- return ask_sessiond_varlen(lsm, NULL, 0, buf);
-}
-
/*
* Create lttng handle and return pointer.
+ *
* The returned pointer will be NULL in case of malloc() error.
*/
struct lttng_handle *lttng_create_handle(const char *session_name,
struct lttng_domain *domain)
{
+ int ret;
struct lttng_handle *handle = NULL;
- if (domain == NULL) {
- goto end;
- }
-
- handle = malloc(sizeof(struct lttng_handle));
+ handle = zmalloc(sizeof(struct lttng_handle));
if (handle == NULL) {
PERROR("malloc handle");
goto end;
}
/* Copy session name */
- copy_string(handle->session_name, session_name,
- sizeof(handle->session_name));
+ ret = lttng_strncpy(handle->session_name, session_name ? : "",
+ sizeof(handle->session_name));
+ if (ret) {
+ goto error;
+ }
- /* Copy lttng domain */
- copy_lttng_domain(&handle->domain, domain);
+ /* Copy lttng domain or leave initialized to 0. */
+ if (domain) {
+ lttng_ctl_copy_lttng_domain(&handle->domain, domain);
+ }
end:
return handle;
+error:
+ free(handle);
+ return NULL;
}
/*
*/
void lttng_destroy_handle(struct lttng_handle *handle)
{
- if (handle) {
- free(handle);
- }
+ free(handle);
}
/*
* Register an outside consumer.
+ *
* Returns size of returned session payload data or a negative error code.
*/
int lttng_register_consumer(struct lttng_handle *handle,
const char *socket_path)
{
+ int ret;
struct lttcomm_session_msg lsm;
if (handle == NULL || socket_path == NULL) {
- return -LTTNG_ERR_INVALID;
- }
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ memset(&lsm, 0, sizeof(lsm));
lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
- copy_string(lsm.session.name, handle->session_name,
+ ret = lttng_strncpy(lsm.session.name, handle->session_name,
sizeof(lsm.session.name));
- copy_lttng_domain(&lsm.domain, &handle->domain);
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
- copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
- return ask_sessiond(&lsm, NULL);
+ ret = lttng_strncpy(lsm.u.reg.path, socket_path,
+ sizeof(lsm.u.reg.path));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+end:
+ return ret;
}
/*
- * Start tracing for all traces of the session.
- * Returns size of returned session payload data or a negative error code.
+ * Start tracing for all traces of the session.
+ *
+ * Returns size of returned session payload data or a negative error code.
*/
int lttng_start_tracing(const char *session_name)
{
+ int ret;
struct lttcomm_session_msg lsm;
if (session_name == NULL) {
- return -LTTNG_ERR_INVALID;
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
+ memset(&lsm, 0, sizeof(lsm));
lsm.cmd_type = LTTNG_START_TRACE;
- copy_string(lsm.session.name, session_name, sizeof(lsm.session.name));
+ ret = lttng_strncpy(lsm.session.name, session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
- return ask_sessiond(&lsm, NULL);
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+end:
+ return ret;
}
/*
struct lttcomm_session_msg lsm;
if (session_name == NULL) {
- return -LTTNG_ERR_INVALID;
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
}
+ memset(&lsm, 0, sizeof(lsm));
lsm.cmd_type = LTTNG_STOP_TRACE;
- copy_string(lsm.session.name, session_name, sizeof(lsm.session.name));
+ ret = lttng_strncpy(lsm.session.name, session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
- ret = ask_sessiond(&lsm, NULL);
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
goto error;
}
goto end;
}
- _MSG("Waiting for data availability");
-
/* Check for data availability */
do {
data_ret = lttng_data_pending(session_name);
}
/*
- * Data sleep time before retrying (in usec). Don't sleep if the call
- * returned value indicates availability.
+ * Data sleep time before retrying (in usec). Don't sleep if the
+ * call returned value indicates availability.
*/
if (data_ret) {
- usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
- _MSG(".");
+ usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US);
}
} while (data_ret != 0);
- MSG("");
-
end:
error:
return ret;
}
/*
- * Add context to event and/or channel.
- * If event_name is NULL, the context is applied to all events of the channel.
- * If channel_name is NULL, a lookup of the event's channel is done.
- * If both are NULL, the context is applied to all events of all channels.
+ * Add context to a channel.
+ *
+ * If the given channel is NULL, add the contexts to all channels.
+ * The event_name param is ignored.
*
* Returns the size of the returned payload data or a negative error code.
*/
struct lttng_event_context *ctx, const char *event_name,
const char *channel_name)
{
+ int ret;
+ size_t len = 0;
+ char *buf = NULL;
struct lttcomm_session_msg lsm;
- /* Safety check. Both are mandatory */
+ /* Safety check. Both are mandatory. */
if (handle == NULL || ctx == NULL) {
- return -LTTNG_ERR_INVALID;
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
memset(&lsm, 0, sizeof(lsm));
-
lsm.cmd_type = LTTNG_ADD_CONTEXT;
- /* Copy channel name */
- copy_string(lsm.u.context.channel_name, channel_name,
+ /* If no channel name, send empty string. */
+ ret = lttng_strncpy(lsm.u.context.channel_name, channel_name ?: "",
sizeof(lsm.u.context.channel_name));
- /* Copy event name */
- copy_string(lsm.u.context.event_name, event_name,
- sizeof(lsm.u.context.event_name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
- copy_lttng_domain(&lsm.domain, &handle->domain);
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
+ ret = lttng_strncpy(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
+ size_t provider_len, ctx_len;
+ const char *provider_name = ctx->u.app_ctx.provider_name;
+ const char *ctx_name = ctx->u.app_ctx.ctx_name;
+
+ if (!provider_name || !ctx_name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ provider_len = strlen(provider_name);
+ if (provider_len == 0) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ lsm.u.context.provider_name_len = provider_len;
+
+ ctx_len = strlen(ctx_name);
+ if (ctx_len == 0) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ lsm.u.context.context_name_len = ctx_len;
+
+ len = provider_len + ctx_len;
+ buf = zmalloc(len);
+ if (!buf) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ memcpy(buf, provider_name, provider_len);
+ memcpy(buf + provider_len, ctx_name, ctx_len);
+ }
memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
- copy_string(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
+ if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
+ /*
+ * Don't leak application addresses to the sessiond.
+ * This is only necessary when ctx is for an app ctx otherwise
+ * the values inside the union (type & config) are overwritten.
+ */
+ lsm.u.context.ctx.u.app_ctx.provider_name = NULL;
+ lsm.u.context.ctx.u.app_ctx.ctx_name = NULL;
+ }
- return ask_sessiond(&lsm, NULL);
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, buf, len, NULL);
+end:
+ free(buf);
+ return ret;
}
/*
- * Enable event(s) for a channel.
- * If no event name is specified, all events are enabled.
- * If no channel name is specified, the default 'channel0' is used.
- * Returns size of returned session payload data or a negative error code.
+ * Enable event(s) for a channel.
+ *
+ * If no event name is specified, all events are enabled.
+ * If no channel name is specified, the default 'channel0' is used.
+ *
+ * Returns size of returned session payload data or a negative error code.
*/
int lttng_enable_event(struct lttng_handle *handle,
struct lttng_event *ev, const char *channel_name)
{
- struct lttcomm_session_msg lsm;
+ return lttng_enable_event_with_exclusions(handle, ev, channel_name,
+ NULL, 0, NULL);
+}
- if (handle == NULL || ev == NULL) {
- return -LTTNG_ERR_INVALID;
+/*
+ * Create or enable an event with a filter expression.
+ *
+ * Return negative error value on error.
+ * Return size of returned session payload data if OK.
+ */
+int lttng_enable_event_with_filter(struct lttng_handle *handle,
+ struct lttng_event *event, const char *channel_name,
+ const char *filter_expression)
+{
+ return lttng_enable_event_with_exclusions(handle, event, channel_name,
+ filter_expression, 0, NULL);
+}
+
+/*
+ * Depending on the event, return a newly allocated agent filter expression or
+ * NULL if not applicable.
+ *
+ * An event with NO loglevel and the name is * will return NULL.
+ */
+static char *set_agent_filter(const char *filter, struct lttng_event *ev)
+{
+ int err;
+ char *agent_filter = NULL;
+
+ assert(ev);
+
+ /* Don't add filter for the '*' event. */
+ if (strcmp(ev->name, "*") != 0) {
+ if (filter) {
+ err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter,
+ ev->name);
+ } else {
+ err = asprintf(&agent_filter, "logger_name == \"%s\"", ev->name);
+ }
+ if (err < 0) {
+ PERROR("asprintf");
+ goto error;
+ }
}
- memset(&lsm, 0, sizeof(lsm));
+ /* Add loglevel filtering if any for the JUL domain. */
+ if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) {
+ const char *op;
- /* If no channel name, we put the default name */
- if (channel_name == NULL) {
- copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME,
- sizeof(lsm.u.enable.channel_name));
- } else {
- copy_string(lsm.u.enable.channel_name, channel_name,
- sizeof(lsm.u.enable.channel_name));
- }
+ if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) {
+ op = ">=";
+ } else {
+ op = "==";
+ }
- copy_lttng_domain(&lsm.domain, &handle->domain);
+ if (filter || agent_filter) {
+ char *new_filter;
- if (ev->name[0] != '\0') {
- lsm.cmd_type = LTTNG_ENABLE_EVENT;
- } else {
- lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
+ err = asprintf(&new_filter, "(%s) && (int_loglevel %s %d)",
+ agent_filter ? agent_filter : filter, op,
+ ev->loglevel);
+ if (agent_filter) {
+ free(agent_filter);
+ }
+ agent_filter = new_filter;
+ } else {
+ err = asprintf(&agent_filter, "int_loglevel %s %d", op,
+ ev->loglevel);
+ }
+ if (err < 0) {
+ PERROR("asprintf");
+ goto error;
+ }
}
- memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
-
- copy_string(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
- return ask_sessiond(&lsm, NULL);
+ return agent_filter;
+error:
+ free(agent_filter);
+ return NULL;
}
/*
- * set filter for an event
- * Return negative error value on error.
- * Return size of returned session payload data if OK.
+ * Enable event(s) for a channel, possibly with exclusions and a filter.
+ * If no event name is specified, all events are enabled.
+ * If no channel name is specified, the default name is used.
+ * If filter expression is not NULL, the filter is set for the event.
+ * If exclusion count is not zero, the exclusions are set for the event.
+ * Returns size of returned session payload data or a negative error code.
*/
-
-int lttng_set_event_filter(struct lttng_handle *handle,
- const char *event_name, const char *channel_name,
- const char *filter_expression)
+int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
+ struct lttng_event *ev, const char *channel_name,
+ const char *original_filter_expression,
+ int exclusion_count, char **exclusion_list)
{
struct lttcomm_session_msg lsm;
- struct filter_parser_ctx *ctx;
- FILE *fmem;
- int ret = 0;
+ struct lttng_payload payload;
+ int ret = 0, i;
+ unsigned int free_filter_expression = 0;
+ struct filter_parser_ctx *ctx = NULL;
- /* Safety check. */
- if (handle == NULL) {
- return -LTTNG_ERR_INVALID;
- }
+ /*
+ * We have either a filter or some exclusions, so we need to set up
+ * a variable-length payload from where to send the data.
+ */
+ lttng_payload_init(&payload);
- if (!filter_expression) {
- return 0;
+ /*
+ * Cast as non-const since we may replace the filter expression
+ * by a dynamically allocated string. Otherwise, the original
+ * string is not modified.
+ */
+ char *filter_expression = (char *) original_filter_expression;
+
+ if (handle == NULL || ev == NULL) {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
}
/*
- * casting const to non-const, as the underlying function will
- * use it in read-only mode.
+ * Empty filter string will always be rejected by the parser
+ * anyway, so treat this corner-case early to eliminate
+ * lttng_fmemopen error for 0-byte allocation.
*/
- fmem = lttng_fmemopen((void *) filter_expression,
- strlen(filter_expression), "r");
- if (!fmem) {
- fprintf(stderr, "Error opening memory as stream\n");
- return -LTTNG_ERR_FILTER_NOMEM;
- }
- ctx = filter_parser_ctx_alloc(fmem);
- if (!ctx) {
- fprintf(stderr, "Error allocating parser\n");
- ret = -LTTNG_ERR_FILTER_NOMEM;
- goto alloc_error;
- }
- ret = filter_parser_ctx_append_ast(ctx);
+ if (filter_expression && filter_expression[0] == '\0') {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+
+ /* If no channel name, send empty string. */
+ ret = lttng_strncpy(lsm.u.enable.channel_name, channel_name ?: "",
+ sizeof(lsm.u.enable.channel_name));
if (ret) {
- fprintf(stderr, "Parse error\n");
- ret = -LTTNG_ERR_FILTER_INVAL;
- goto parse_error;
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ lsm.cmd_type = LTTNG_ENABLE_EVENT;
+ if (ev->name[0] == '\0') {
+ /* Enable all events. */
+ ret = lttng_strncpy(ev->name, "*", sizeof(ev->name));
+ assert(ret == 0);
}
- ret = filter_visitor_set_parent(ctx);
+
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
+ memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
+
+ ret = lttng_strncpy(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
if (ret) {
- fprintf(stderr, "Set parent error\n");
- ret = -LTTNG_ERR_FILTER_INVAL;
- goto parse_error;
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
}
- if (print_xml) {
- ret = filter_visitor_print_xml(ctx, stdout, 0);
+
+ lsm.u.enable.exclusion_count = exclusion_count;
+ lsm.u.enable.bytecode_len = 0;
+
+ /* Parse filter expression. */
+ if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
+ || handle->domain.type == LTTNG_DOMAIN_LOG4J
+ || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
+ if (handle->domain.type == LTTNG_DOMAIN_JUL ||
+ handle->domain.type == LTTNG_DOMAIN_LOG4J ||
+ handle->domain.type == LTTNG_DOMAIN_PYTHON) {
+ char *agent_filter;
+
+ /* Setup JUL filter if needed. */
+ agent_filter = set_agent_filter(filter_expression, ev);
+ if (!agent_filter) {
+ if (!filter_expression) {
+ /*
+ * No JUL and no filter, just skip
+ * everything below.
+ */
+ goto ask_sessiond;
+ }
+ } else {
+ /*
+ * With an agent filter, the original filter has
+ * been added to it thus replace the filter
+ * expression.
+ */
+ filter_expression = agent_filter;
+ free_filter_expression = 1;
+ }
+ }
+
+ ret = filter_parser_ctx_create_from_filter_expression(filter_expression, &ctx);
if (ret) {
- fflush(stdout);
- fprintf(stderr, "XML print error\n");
- ret = -LTTNG_ERR_FILTER_INVAL;
- goto parse_error;
+ goto filter_error;
}
+
+ lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
+ + bytecode_get_len(&ctx->bytecode->b);
+ lsm.u.enable.expression_len = strlen(filter_expression) + 1;
}
- dbg_printf("Generating IR... ");
- fflush(stdout);
- ret = filter_visitor_ir_generate(ctx);
+ ret = lttng_dynamic_buffer_set_capacity(&payload.buffer,
+ lsm.u.enable.bytecode_len +
+ lsm.u.enable.expression_len +
+ LTTNG_SYMBOL_NAME_LEN *
+ exclusion_count);
if (ret) {
- fprintf(stderr, "Generate IR error\n");
- ret = -LTTNG_ERR_FILTER_INVAL;
- goto parse_error;
+ ret = -LTTNG_ERR_EXCLUSION_NOMEM;
+ goto mem_error;
}
- dbg_printf("done\n");
- dbg_printf("Validating IR... ");
- fflush(stdout);
- ret = filter_visitor_ir_check_binary_op_nesting(ctx);
- if (ret) {
- ret = -LTTNG_ERR_FILTER_INVAL;
- goto parse_error;
+ /* Put exclusion names first in the data. */
+ for (i = 0; i < exclusion_count; i++) {
+ size_t exclusion_len;
+
+ exclusion_len = lttng_strnlen(exclusion_list[i],
+ LTTNG_SYMBOL_NAME_LEN);
+ if (exclusion_len == LTTNG_SYMBOL_NAME_LEN) {
+ /* Exclusion is not NULL-terminated. */
+ ret = -LTTNG_ERR_INVALID;
+ goto mem_error;
+ }
+
+ ret = lttng_dynamic_buffer_append(&payload.buffer,
+ exclusion_list[i], exclusion_len);
+ if (ret) {
+ goto mem_error;
+ }
+
+ /*
+ * Padding the rest of the entry with zeros. Every exclusion
+ * entries take LTTNG_SYMBOL_NAME_LEN bytes in the buffer.
+ */
+ ret = lttng_dynamic_buffer_set_size(&payload.buffer,
+ LTTNG_SYMBOL_NAME_LEN * (i + 1));
+ if (ret) {
+ goto mem_error;
+ }
}
- dbg_printf("done\n");
- dbg_printf("Generating bytecode... ");
- fflush(stdout);
- ret = filter_visitor_bytecode_generate(ctx);
- if (ret) {
- fprintf(stderr, "Generate bytecode error\n");
- ret = -LTTNG_ERR_FILTER_INVAL;
- goto parse_error;
+ /* Add filter expression next. */
+ if (filter_expression) {
+ ret = lttng_dynamic_buffer_append(&payload.buffer,
+ filter_expression, lsm.u.enable.expression_len);
+ if (ret) {
+ goto mem_error;
+ }
+ }
+ /* Add filter bytecode next. */
+ if (ctx && lsm.u.enable.bytecode_len != 0) {
+ ret = lttng_dynamic_buffer_append(&payload.buffer,
+ &ctx->bytecode->b, lsm.u.enable.bytecode_len);
+ if (ret) {
+ goto mem_error;
+ }
}
- dbg_printf("done\n");
- dbg_printf("Size of bytecode generated: %u bytes.\n",
- bytecode_get_len(&ctx->bytecode->b));
+ if (ev->extended.ptr) {
+ struct lttng_event_extended *ev_ext =
+ (struct lttng_event_extended *) ev->extended.ptr;
+
+ if (ev_ext->probe_location) {
+ /*
+ * lttng_userspace_probe_location_serialize returns the
+ * number of bytes that was appended to the buffer.
+ */
+ ret = lttng_userspace_probe_location_serialize(
+ ev_ext->probe_location, &payload);
+ if (ret < 0) {
+ goto mem_error;
+ }
- memset(&lsm, 0, sizeof(lsm));
+ /*
+ * Set the size of the userspace probe location element
+ * of the buffer so that the receiving side knows where
+ * to split it.
+ */
+ lsm.u.enable.userspace_probe_location_len = ret;
+ }
+ }
- lsm.cmd_type = LTTNG_SET_FILTER;
+ {
+ struct lttng_payload_view view = lttng_payload_view_from_payload(
+ &payload, 0, -1);
+ int fd_count = lttng_payload_view_get_fd_handle_count(&view);
+ int fd_to_send;
- /* Copy channel name */
- copy_string(lsm.u.filter.channel_name, channel_name,
- sizeof(lsm.u.filter.channel_name));
- /* Copy event name */
- copy_string(lsm.u.filter.event_name, event_name,
- sizeof(lsm.u.filter.event_name));
- lsm.u.filter.bytecode_len = sizeof(ctx->bytecode->b)
- + bytecode_get_len(&ctx->bytecode->b);
+ if (fd_count < 0) {
+ goto mem_error;
+ }
- copy_lttng_domain(&lsm.domain, &handle->domain);
+ assert(fd_count == 0 || fd_count == 1);
+ if (fd_count == 1) {
+ struct fd_handle *h =
+ lttng_payload_view_pop_fd_handle(&view);
- copy_string(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
+ if (!h) {
+ goto mem_error;
+ }
- ret = ask_sessiond_varlen(&lsm, &ctx->bytecode->b,
- lsm.u.filter.bytecode_len, NULL);
+ fd_to_send = fd_handle_get_fd(h);
+ fd_handle_put(h);
+ }
- filter_bytecode_free(ctx);
- filter_ir_free(ctx);
- filter_parser_ctx_free(ctx);
- if (fclose(fmem) != 0) {
- perror("fclose");
+ ret = lttng_ctl_ask_sessiond_fds_varlen(&lsm,
+ fd_count ? &fd_to_send : NULL, fd_count,
+ view.buffer.size ? view.buffer.data : NULL,
+ view.buffer.size, NULL, NULL, 0);
}
- return ret;
-parse_error:
- filter_bytecode_free(ctx);
- filter_ir_free(ctx);
- filter_parser_ctx_free(ctx);
-alloc_error:
- if (fclose(fmem) != 0) {
- perror("fclose");
+mem_error:
+ if (filter_expression && ctx) {
+ filter_bytecode_free(ctx);
+ filter_ir_free(ctx);
+ filter_parser_ctx_free(ctx);
+ }
+filter_error:
+ if (free_filter_expression) {
+ /*
+ * The filter expression has been replaced and must be freed as
+ * it is not the original filter expression received as a
+ * parameter.
+ */
+ free(filter_expression);
}
+error:
+ /*
+ * Return directly to the caller and don't ask the sessiond since
+ * something went wrong in the parsing of data above.
+ */
+ lttng_payload_reset(&payload);
+ return ret;
+
+ask_sessiond:
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
return ret;
}
-/*
- * Disable event(s) of a channel and domain.
- * If no event name is specified, all events are disabled.
- * If no channel name is specified, the default 'channel0' is used.
- * Returns size of returned session payload data or a negative error code.
- */
-int lttng_disable_event(struct lttng_handle *handle, const char *name,
- const char *channel_name)
+int lttng_disable_event_ext(struct lttng_handle *handle,
+ struct lttng_event *ev, const char *channel_name,
+ const char *original_filter_expression)
{
struct lttcomm_session_msg lsm;
+ char *varlen_data;
+ int ret = 0;
+ unsigned int free_filter_expression = 0;
+ struct filter_parser_ctx *ctx = NULL;
+ /*
+ * Cast as non-const since we may replace the filter expression
+ * by a dynamically allocated string. Otherwise, the original
+ * string is not modified.
+ */
+ char *filter_expression = (char *) original_filter_expression;
- if (handle == NULL) {
- return -LTTNG_ERR_INVALID;
+ if (handle == NULL || ev == NULL) {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ /*
+ * Empty filter string will always be rejected by the parser
+ * anyway, so treat this corner-case early to eliminate
+ * lttng_fmemopen error for 0-byte allocation.
+ */
+ if (filter_expression && filter_expression[0] == '\0') {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
}
memset(&lsm, 0, sizeof(lsm));
- if (channel_name) {
- copy_string(lsm.u.disable.channel_name, channel_name,
- sizeof(lsm.u.disable.channel_name));
- } else {
- copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME,
- sizeof(lsm.u.disable.channel_name));
+ /* If no channel name, send empty string. */
+ ret = lttng_strncpy(lsm.u.disable.channel_name, channel_name ?: "",
+ sizeof(lsm.u.disable.channel_name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
}
- copy_lttng_domain(&lsm.domain, &handle->domain);
+ lsm.cmd_type = LTTNG_DISABLE_EVENT;
- if (name != NULL) {
- copy_string(lsm.u.disable.name, name, sizeof(lsm.u.disable.name));
- lsm.cmd_type = LTTNG_DISABLE_EVENT;
- } else {
- lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
- }
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
+ memcpy(&lsm.u.disable.event, ev, sizeof(lsm.u.disable.event));
- copy_string(lsm.session.name, handle->session_name,
+ ret = lttng_strncpy(lsm.session.name, handle->session_name,
sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
- return ask_sessiond(&lsm, NULL);
-}
-
-/*
- * Enable channel per domain
- * Returns size of returned session payload data or a negative error code.
- */
-int lttng_enable_channel(struct lttng_handle *handle,
- struct lttng_channel *chan)
-{
- struct lttcomm_session_msg lsm;
+ lsm.u.disable.bytecode_len = 0;
/*
- * NULL arguments are forbidden. No default values.
+ * For the JUL domain, a filter is enforced except for the
+ * disable all event. This is done to avoid having the event in
+ * all sessions thus filtering by logger name.
*/
- if (handle == NULL || chan == NULL) {
- return -LTTNG_ERR_INVALID;
+ if (filter_expression == NULL &&
+ (handle->domain.type != LTTNG_DOMAIN_JUL &&
+ handle->domain.type != LTTNG_DOMAIN_LOG4J &&
+ handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
+ goto ask_sessiond;
}
- memset(&lsm, 0, sizeof(lsm));
+ /*
+ * We have a filter, so we need to set up a variable-length
+ * memory block from where to send the data.
+ */
+
+ /* Parse filter expression */
+ if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
+ || handle->domain.type == LTTNG_DOMAIN_LOG4J
+ || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
+ if (handle->domain.type == LTTNG_DOMAIN_JUL ||
+ handle->domain.type == LTTNG_DOMAIN_LOG4J ||
+ handle->domain.type == LTTNG_DOMAIN_PYTHON) {
+ char *agent_filter;
+
+ /* Setup JUL filter if needed. */
+ agent_filter = set_agent_filter(filter_expression, ev);
+ if (!agent_filter) {
+ if (!filter_expression) {
+ /*
+ * No JUL and no filter, just skip
+ * everything below.
+ */
+ goto ask_sessiond;
+ }
+ } else {
+ /*
+ * With a JUL filter, the original filter has
+ * been added to it thus replace the filter
+ * expression.
+ */
+ filter_expression = agent_filter;
+ free_filter_expression = 1;
+ }
+ }
- memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
+ ret = filter_parser_ctx_create_from_filter_expression(filter_expression, &ctx);
+ if (ret) {
+ goto filter_error;
+ }
- lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
+ lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
+ + bytecode_get_len(&ctx->bytecode->b);
+ lsm.u.enable.expression_len = strlen(filter_expression) + 1;
+ }
- copy_lttng_domain(&lsm.domain, &handle->domain);
+ varlen_data = zmalloc(lsm.u.disable.bytecode_len
+ + lsm.u.disable.expression_len);
+ if (!varlen_data) {
+ ret = -LTTNG_ERR_EXCLUSION_NOMEM;
+ goto mem_error;
+ }
- copy_string(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
+ /* Add filter expression. */
+ if (lsm.u.disable.expression_len != 0) {
+ memcpy(varlen_data,
+ filter_expression,
+ lsm.u.disable.expression_len);
+ }
+ /* Add filter bytecode next. */
+ if (ctx && lsm.u.disable.bytecode_len != 0) {
+ memcpy(varlen_data
+ + lsm.u.disable.expression_len,
+ &ctx->bytecode->b,
+ lsm.u.disable.bytecode_len);
+ }
+
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, varlen_data,
+ lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL);
+ free(varlen_data);
+
+mem_error:
+ if (filter_expression && ctx) {
+ filter_bytecode_free(ctx);
+ filter_ir_free(ctx);
+ filter_parser_ctx_free(ctx);
+ }
+filter_error:
+ if (free_filter_expression) {
+ /*
+ * The filter expression has been replaced and must be freed as
+ * it is not the original filter expression received as a
+ * parameter.
+ */
+ free(filter_expression);
+ }
+error:
+ /*
+ * Return directly to the caller and don't ask the sessiond since
+ * something went wrong in the parsing of data above.
+ */
+ return ret;
- return ask_sessiond(&lsm, NULL);
+ask_sessiond:
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+ return ret;
}
/*
- * All tracing will be stopped for registered events of the channel.
- * Returns size of returned session payload data or a negative error code.
+ * Disable event(s) of a channel and domain.
+ * If no event name is specified, all events are disabled.
+ * If no channel name is specified, the default 'channel0' is used.
+ * Returns size of returned session payload data or a negative error code.
*/
-int lttng_disable_channel(struct lttng_handle *handle, const char *name)
+int lttng_disable_event(struct lttng_handle *handle, const char *name,
+ const char *channel_name)
{
- struct lttcomm_session_msg lsm;
+ int ret;
+ struct lttng_event ev;
- /* Safety check. Both are mandatory */
- if (handle == NULL || name == NULL) {
+ memset(&ev, 0, sizeof(ev));
+ ev.loglevel = -1;
+ ev.type = LTTNG_EVENT_ALL;
+ ret = lttng_strncpy(ev.name, name ?: "", sizeof(ev.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = lttng_disable_event_ext(handle, &ev, channel_name, NULL);
+end:
+ return ret;
+}
+
+struct lttng_channel *lttng_channel_create(struct lttng_domain *domain)
+{
+ struct lttng_channel *channel = NULL;
+ struct lttng_channel_extended *extended = NULL;
+
+ if (!domain) {
+ goto error;
+ }
+
+ /* Validate domain. */
+ switch (domain->type) {
+ case LTTNG_DOMAIN_UST:
+ switch (domain->buf_type) {
+ case LTTNG_BUFFER_PER_UID:
+ case LTTNG_BUFFER_PER_PID:
+ break;
+ default:
+ goto error;
+ }
+ break;
+ case LTTNG_DOMAIN_KERNEL:
+ if (domain->buf_type != LTTNG_BUFFER_GLOBAL) {
+ goto error;
+ }
+ break;
+ default:
+ goto error;
+ }
+
+ channel = zmalloc(sizeof(*channel));
+ if (!channel) {
+ goto error;
+ }
+
+ extended = zmalloc(sizeof(*extended));
+ if (!extended) {
+ goto error;
+ }
+
+ channel->attr.extended.ptr = extended;
+
+ lttng_channel_set_default_attr(domain, &channel->attr);
+ return channel;
+error:
+ free(channel);
+ free(extended);
+ return NULL;
+}
+
+void lttng_channel_destroy(struct lttng_channel *channel)
+{
+ if (!channel) {
+ return;
+ }
+
+ if (channel->attr.extended.ptr) {
+ free(channel->attr.extended.ptr);
+ }
+ free(channel);
+}
+
+/*
+ * Enable channel per domain
+ * Returns size of returned session payload data or a negative error code.
+ */
+int lttng_enable_channel(struct lttng_handle *handle,
+ struct lttng_channel *in_chan)
+{
+ enum lttng_error_code ret_code;
+ int ret;
+ struct lttcomm_session_msg lsm;
+ uint64_t total_buffer_size_needed_per_cpu = 0;
+
+ /* NULL arguments are forbidden. No default values. */
+ if (handle == NULL || in_chan == NULL) {
+ return -LTTNG_ERR_INVALID;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+ memcpy(&lsm.u.channel.chan, in_chan, sizeof(lsm.u.channel.chan));
+ lsm.u.channel.chan.attr.extended.ptr = NULL;
+
+ if (!in_chan->attr.extended.ptr) {
+ struct lttng_channel *channel;
+ struct lttng_channel_extended *extended;
+
+ channel = lttng_channel_create(&handle->domain);
+ if (!channel) {
+ return -LTTNG_ERR_NOMEM;
+ }
+
+ /*
+ * Create a new channel in order to use default extended
+ * attribute values.
+ */
+ extended = (struct lttng_channel_extended *)
+ channel->attr.extended.ptr;
+ memcpy(&lsm.u.channel.extended, extended, sizeof(*extended));
+ lttng_channel_destroy(channel);
+ } else {
+ struct lttng_channel_extended *extended;
+
+ extended = (struct lttng_channel_extended *)
+ in_chan->attr.extended.ptr;
+ memcpy(&lsm.u.channel.extended, extended, sizeof(*extended));
+ }
+
+ /*
+ * Verify that the amount of memory required to create the requested
+ * buffer is available on the system at the moment.
+ */
+ if (lsm.u.channel.chan.attr.num_subbuf >
+ UINT64_MAX / lsm.u.channel.chan.attr.subbuf_size) {
+ /* Overflow */
+ ret = -LTTNG_ERR_OVERFLOW;
+ goto end;
+ }
+
+ total_buffer_size_needed_per_cpu = lsm.u.channel.chan.attr.num_subbuf *
+ lsm.u.channel.chan.attr.subbuf_size;
+ ret_code = check_enough_available_memory(
+ total_buffer_size_needed_per_cpu);
+ if (ret_code != LTTNG_OK) {
+ ret = -ret_code;
+ goto end;
+ }
+
+ lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
+
+ ret = lttng_strncpy(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+end:
+ return ret;
+}
+
+/*
+ * All tracing will be stopped for registered events of the channel.
+ * Returns size of returned session payload data or a negative error code.
+ */
+int lttng_disable_channel(struct lttng_handle *handle, const char *name)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ /* Safety check. Both are mandatory. */
+ if (handle == NULL || name == NULL) {
return -LTTNG_ERR_INVALID;
}
lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
- copy_string(lsm.u.disable.channel_name, name,
+ ret = lttng_strncpy(lsm.u.disable.channel_name, name,
sizeof(lsm.u.disable.channel_name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
- copy_lttng_domain(&lsm.domain, &handle->domain);
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
- copy_string(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
+ ret = lttng_strncpy(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
- return ask_sessiond(&lsm, NULL);
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+end:
+ return ret;
}
/*
- * Lists all available tracepoints of domain.
- * Sets the contents of the events array.
- * Returns the number of lttng_event entries in events;
- * on error, returns a negative value.
+ * Lists all available tracepoints of domain.
+ * Sets the contents of the events array.
+ * Returns the number of lttng_event entries in events;
+ * on error, returns a negative value.
*/
int lttng_list_tracepoints(struct lttng_handle *handle,
struct lttng_event **events)
return -LTTNG_ERR_INVALID;
}
+ memset(&lsm, 0, sizeof(lsm));
lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
- copy_lttng_domain(&lsm.domain, &handle->domain);
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
- ret = ask_sessiond(&lsm, (void **) events);
+ ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
if (ret < 0) {
return ret;
}
}
/*
- * Lists all available tracepoint fields of domain.
- * Sets the contents of the event field array.
- * Returns the number of lttng_event_field entries in events;
- * on error, returns a negative value.
+ * Lists all available tracepoint fields of domain.
+ * Sets the contents of the event field array.
+ * Returns the number of lttng_event_field entries in events;
+ * on error, returns a negative value.
*/
int lttng_list_tracepoint_fields(struct lttng_handle *handle,
struct lttng_event_field **fields)
return -LTTNG_ERR_INVALID;
}
+ memset(&lsm, 0, sizeof(lsm));
lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
- copy_lttng_domain(&lsm.domain, &handle->domain);
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
- ret = ask_sessiond(&lsm, (void **) fields);
+ ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
if (ret < 0) {
return ret;
}
}
/*
- * Returns a human readable string describing
- * the error code (a negative value).
+ * Lists all available kernel system calls. Allocates and sets the contents of
+ * the events array.
+ *
+ * Returns the number of lttng_event entries in events; on error, returns a
+ * negative value.
+ */
+int lttng_list_syscalls(struct lttng_event **events)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ if (!events) {
+ return -LTTNG_ERR_INVALID;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_LIST_SYSCALLS;
+ /* Force kernel domain for system calls. */
+ lsm.domain.type = LTTNG_DOMAIN_KERNEL;
+
+ ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return ret / sizeof(struct lttng_event);
+}
+
+/*
+ * Returns a human readable string describing
+ * the error code (a negative value).
*/
const char *lttng_strerror(int code)
{
return error_get_str(code);
}
+enum lttng_error_code lttng_create_session_ext(
+ struct lttng_session_descriptor *session_descriptor)
+{
+ enum lttng_error_code ret_code;
+ struct lttcomm_session_msg lsm = {
+ .cmd_type = LTTNG_CREATE_SESSION_EXT,
+ };
+ void *reply = NULL;
+ struct lttng_buffer_view reply_view;
+ int reply_ret;
+ bool sessiond_must_generate_ouput;
+ struct lttng_dynamic_buffer payload;
+ int ret;
+ size_t descriptor_size;
+ struct lttng_session_descriptor *descriptor_reply = NULL;
+
+ lttng_dynamic_buffer_init(&payload);
+ if (!session_descriptor) {
+ ret_code = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ sessiond_must_generate_ouput =
+ !lttng_session_descriptor_is_output_destination_initialized(
+ session_descriptor);
+ if (sessiond_must_generate_ouput) {
+ const char *home_dir = utils_get_home_dir();
+ size_t home_dir_len = home_dir ? strlen(home_dir) + 1 : 0;
+
+ if (!home_dir || home_dir_len > LTTNG_PATH_MAX) {
+ ret_code = LTTNG_ERR_FATAL;
+ goto end;
+ }
+
+ lsm.u.create_session.home_dir_size = (uint16_t) home_dir_len;
+ ret = lttng_dynamic_buffer_append(&payload, home_dir,
+ home_dir_len);
+ if (ret) {
+ ret_code = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+ }
+
+ descriptor_size = payload.size;
+ ret = lttng_session_descriptor_serialize(session_descriptor,
+ &payload);
+ if (ret) {
+ ret_code = LTTNG_ERR_INVALID;
+ goto end;
+ }
+ descriptor_size = payload.size - descriptor_size;
+ lsm.u.create_session.session_descriptor_size = descriptor_size;
+
+ /* Command returns a session descriptor on success. */
+ reply_ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, payload.data,
+ payload.size, &reply);
+ if (reply_ret < 0) {
+ ret_code = -reply_ret;
+ goto end;
+ } else if (reply_ret == 0) {
+ /* Socket unexpectedly closed by the session daemon. */
+ ret_code = LTTNG_ERR_FATAL;
+ goto end;
+ }
+
+ reply_view = lttng_buffer_view_init(reply, 0, reply_ret);
+ ret = lttng_session_descriptor_create_from_buffer(&reply_view,
+ &descriptor_reply);
+ if (ret < 0) {
+ ret_code = LTTNG_ERR_FATAL;
+ goto end;
+ }
+ ret_code = LTTNG_OK;
+ lttng_session_descriptor_assign(session_descriptor, descriptor_reply);
+end:
+ free(reply);
+ lttng_dynamic_buffer_reset(&payload);
+ lttng_session_descriptor_destroy(descriptor_reply);
+ return ret_code;
+}
+
/*
- * Create a brand new session using name and url for destination.
+ * Create a new session using name and url for destination.
*
- * Returns LTTNG_OK on success or a negative error code.
+ * Return 0 on success else a negative LTTng error code.
*/
int lttng_create_session(const char *name, const char *url)
{
+ int ret;
ssize_t size;
- struct lttcomm_session_msg lsm;
struct lttng_uri *uris = NULL;
+ struct lttng_session_descriptor *descriptor = NULL;
+ enum lttng_error_code ret_code;
+
+ if (!name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ size = uri_parse_str_urls(url, NULL, &uris);
+ if (size < 0) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ switch (size) {
+ case 0:
+ descriptor = lttng_session_descriptor_create(name);
+ break;
+ case 1:
+ if (uris[0].dtype != LTTNG_DST_PATH) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ descriptor = lttng_session_descriptor_local_create(name,
+ uris[0].dst.path);
+ break;
+ case 2:
+ descriptor = lttng_session_descriptor_network_create(name, url,
+ NULL);
+ break;
+ default:
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ if (!descriptor) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ ret_code = lttng_create_session_ext(descriptor);
+ ret = ret_code == LTTNG_OK ? 0 : -ret_code;
+end:
+ lttng_session_descriptor_destroy(descriptor);
+ free(uris);
+ return ret;
+}
+
+/*
+ * Create a session exclusively used for snapshot.
+ *
+ * Return 0 on success else a negative LTTng error code.
+ */
+int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
+{
+ int ret;
+ enum lttng_error_code ret_code;
+ ssize_t size;
+ struct lttng_uri *uris = NULL;
+ struct lttng_session_descriptor *descriptor = NULL;
+
+ if (!name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ size = uri_parse_str_urls(snapshot_url, NULL, &uris);
+ if (size < 0) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ /*
+ * If the user does not specify a custom subdir, use the session name.
+ */
+ if (size > 0 && uris[0].dtype != LTTNG_DST_PATH &&
+ strlen(uris[0].subdir) == 0) {
+ ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s",
+ name);
+ if (ret < 0) {
+ PERROR("Failed to set session name as network destination sub-directory");
+ ret = -LTTNG_ERR_FATAL;
+ goto end;
+ } else if (ret >= sizeof(uris[0].subdir)) {
+ /* Truncated output. */
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ }
+
+ switch (size) {
+ case 0:
+ descriptor = lttng_session_descriptor_snapshot_create(name);
+ break;
+ case 1:
+ if (uris[0].dtype != LTTNG_DST_PATH) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ descriptor = lttng_session_descriptor_snapshot_local_create(
+ name,
+ uris[0].dst.path);
+ break;
+ case 2:
+ descriptor = lttng_session_descriptor_snapshot_network_create(
+ name,
+ snapshot_url,
+ NULL);
+ break;
+ default:
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ if (!descriptor) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ ret_code = lttng_create_session_ext(descriptor);
+ ret = ret_code == LTTNG_OK ? 0 : -ret_code;
+end:
+ lttng_session_descriptor_destroy(descriptor);
+ free(uris);
+ return ret;
+}
+
+/*
+ * Create a session exclusively used for live.
+ *
+ * Return 0 on success else a negative LTTng error code.
+ */
+int lttng_create_session_live(const char *name, const char *url,
+ unsigned int timer_interval)
+{
+ int ret;
+ enum lttng_error_code ret_code;
+ struct lttng_session_descriptor *descriptor = NULL;
+
+ if (!name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (url) {
+ descriptor = lttng_session_descriptor_live_network_create(
+ name, url, NULL, timer_interval);
+ } else {
+ descriptor = lttng_session_descriptor_live_create(
+ name, timer_interval);
+ }
+ if (!descriptor) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ ret_code = lttng_create_session_ext(descriptor);
+ ret = ret_code == LTTNG_OK ? 0 : -ret_code;
+end:
+ lttng_session_descriptor_destroy(descriptor);
+ return ret;
+}
+
+/*
+ * Stop the session and wait for the data before destroying it
+ *
+ * Return 0 on success else a negative LTTng error code.
+ */
+int lttng_destroy_session(const char *session_name)
+{
+ int ret;
+ enum lttng_error_code ret_code;
+ enum lttng_destruction_handle_status status;
+ struct lttng_destruction_handle *handle = NULL;
+
+ /*
+ * Stop the tracing and wait for the data to be
+ * consumed.
+ */
+ ret = _lttng_stop_tracing(session_name, 1);
+ if (ret && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
+ goto end;
+ }
+
+ ret_code = lttng_destroy_session_ext(session_name, &handle);
+ if (ret_code != LTTNG_OK) {
+ ret = (int) -ret_code;
+ goto end;
+ }
+ assert(handle);
+
+ /* Block until the completion of the destruction of the session. */
+ status = lttng_destruction_handle_wait_for_completion(handle, -1);
+ if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED) {
+ ret = -LTTNG_ERR_UNK;
+ goto end;
+ }
+
+ status = lttng_destruction_handle_get_result(handle, &ret_code);
+ if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
+ ret = -LTTNG_ERR_UNK;
+ goto end;
+ }
+ ret = ret_code == LTTNG_OK ? 0 : -ret_code;
+end:
+ lttng_destruction_handle_destroy(handle);
+ return ret;
+}
+
+/*
+ * Destroy the session without waiting for the data.
+ */
+int lttng_destroy_session_no_wait(const char *session_name)
+{
+ enum lttng_error_code ret_code;
+
+ ret_code = lttng_destroy_session_ext(session_name, NULL);
+ return ret_code == LTTNG_OK ? 0 : -ret_code;
+}
+
+/*
+ * Ask the session daemon for all available sessions.
+ * Sets the contents of the sessions array.
+ * Returns the number of lttng_session entries in sessions;
+ * on error, returns a negative value.
+ */
+int lttng_list_sessions(struct lttng_session **out_sessions)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+ const size_t session_size = sizeof(struct lttng_session) +
+ sizeof(struct lttng_session_extended);
+ size_t session_count, i;
+ struct lttng_session_extended *sessions_extended_begin;
+ struct lttng_session *sessions = NULL;
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_LIST_SESSIONS;
+ /*
+ * Initialize out_sessions to NULL so it is initialized when
+ * lttng_list_sessions returns 0, thus allowing *out_sessions to
+ * be subsequently freed.
+ */
+ *out_sessions = NULL;
+ ret = lttng_ctl_ask_sessiond(&lsm, (void**) &sessions);
+ if (ret <= 0) {
+ goto end;
+ }
+ if (!sessions) {
+ ret = -LTTNG_ERR_FATAL;
+ goto end;
+ }
+
+ if (ret % session_size) {
+ ret = -LTTNG_ERR_UNK;
+ free(sessions);
+ goto end;
+ }
+ session_count = (size_t) ret / session_size;
+ sessions_extended_begin = (struct lttng_session_extended *)
+ (&sessions[session_count]);
- if (name == NULL) {
- return -LTTNG_ERR_INVALID;
+ /* Set extended session info pointers. */
+ for (i = 0; i < session_count; i++) {
+ struct lttng_session *session = &sessions[i];
+ struct lttng_session_extended *extended =
+ &(sessions_extended_begin[i]);
+
+ session->extended.ptr = extended;
}
- memset(&lsm, 0, sizeof(lsm));
+ ret = (int) session_count;
+ *out_sessions = sessions;
+end:
+ return ret;
+}
- lsm.cmd_type = LTTNG_CREATE_SESSION;
- copy_string(lsm.session.name, name, sizeof(lsm.session.name));
+enum lttng_error_code lttng_session_get_creation_time(
+ const struct lttng_session *session, uint64_t *creation_time)
+{
+ enum lttng_error_code ret = LTTNG_OK;
+ struct lttng_session_extended *extended;
- /* There should never be a data URL */
- size = parse_str_urls_to_uri(url, NULL, &uris);
- if (size < 0) {
- return -LTTNG_ERR_INVALID;
+ if (!session || !creation_time || !session->extended.ptr) {
+ ret = LTTNG_ERR_INVALID;
+ goto end;
}
- lsm.u.uri.size = size;
-
- return ask_sessiond_varlen(&lsm, uris, sizeof(struct lttng_uri) * size,
- NULL);
+ extended = session->extended.ptr;
+ if (!extended->creation_time.is_set) {
+ /* Not created on the session daemon yet. */
+ ret = LTTNG_ERR_SESSION_NOT_EXIST;
+ goto end;
+ }
+ *creation_time = extended->creation_time.value;
+end:
+ return ret;
}
-/*
- * Destroy session using name.
- * Returns size of returned session payload data or a negative error code.
- */
-int lttng_destroy_session(const char *session_name)
+int lttng_set_session_shm_path(const char *session_name,
+ const char *shm_path)
{
+ int ret;
struct lttcomm_session_msg lsm;
if (session_name == NULL) {
return -LTTNG_ERR_INVALID;
}
- lsm.cmd_type = LTTNG_DESTROY_SESSION;
-
- copy_string(lsm.session.name, session_name, sizeof(lsm.session.name));
-
- return ask_sessiond(&lsm, NULL);
-}
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_SET_SESSION_SHM_PATH;
-/*
- * Ask the session daemon for all available sessions.
- * Sets the contents of the sessions array.
- * Returns the number of lttng_session entries in sessions;
- * on error, returns a negative value.
- */
-int lttng_list_sessions(struct lttng_session **sessions)
-{
- int ret;
- struct lttcomm_session_msg lsm;
+ ret = lttng_strncpy(lsm.session.name, session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
- lsm.cmd_type = LTTNG_LIST_SESSIONS;
- ret = ask_sessiond(&lsm, (void**) sessions);
- if (ret < 0) {
- return ret;
+ ret = lttng_strncpy(lsm.u.set_shm_path.shm_path, shm_path ?: "",
+ sizeof(lsm.u.set_shm_path.shm_path));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
- return ret / sizeof(struct lttng_session);
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+end:
+ return ret;
}
/*
- * Ask the session daemon for all available domains of a session.
- * Sets the contents of the domains array.
- * Returns the number of lttng_domain entries in domains;
- * on error, returns a negative value.
+ * Ask the session daemon for all available domains of a session.
+ * Sets the contents of the domains array.
+ * Returns the number of lttng_domain entries in domains;
+ * on error, returns a negative value.
*/
int lttng_list_domains(const char *session_name,
struct lttng_domain **domains)
struct lttcomm_session_msg lsm;
if (session_name == NULL) {
- return -LTTNG_ERR_INVALID;
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
}
+ memset(&lsm, 0, sizeof(lsm));
lsm.cmd_type = LTTNG_LIST_DOMAINS;
- copy_string(lsm.session.name, session_name, sizeof(lsm.session.name));
+ ret = lttng_strncpy(lsm.session.name, session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
- ret = ask_sessiond(&lsm, (void**) domains);
+ ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
if (ret < 0) {
- return ret;
+ goto error;
}
return ret / sizeof(struct lttng_domain);
+error:
+ return ret;
}
/*
- * Ask the session daemon for all available channels of a session.
- * Sets the contents of the channels array.
- * Returns the number of lttng_channel entries in channels;
- * on error, returns a negative value.
+ * Ask the session daemon for all available channels of a session.
+ * Sets the contents of the channels array.
+ * Returns the number of lttng_channel entries in channels;
+ * on error, returns a negative value.
*/
int lttng_list_channels(struct lttng_handle *handle,
struct lttng_channel **channels)
{
int ret;
+ size_t channel_count, i;
+ const size_t channel_size = sizeof(struct lttng_channel) +
+ sizeof(struct lttng_channel_extended);
struct lttcomm_session_msg lsm;
+ void *extended_at;
if (handle == NULL) {
- return -LTTNG_ERR_INVALID;
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
+ memset(&lsm, 0, sizeof(lsm));
lsm.cmd_type = LTTNG_LIST_CHANNELS;
- copy_string(lsm.session.name, handle->session_name,
+ ret = lttng_strncpy(lsm.session.name, handle->session_name,
sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
- copy_lttng_domain(&lsm.domain, &handle->domain);
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
- ret = ask_sessiond(&lsm, (void**) channels);
+ ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
if (ret < 0) {
- return ret;
+ goto end;
+ }
+
+ if (ret % channel_size) {
+ ret = -LTTNG_ERR_UNK;
+ free(*channels);
+ *channels = NULL;
+ goto end;
+ }
+ channel_count = (size_t) ret / channel_size;
+
+ /* Set extended info pointers */
+ extended_at = ((void *) *channels) +
+ channel_count * sizeof(struct lttng_channel);
+ for (i = 0; i < channel_count; i++) {
+ struct lttng_channel *chan = &(*channels)[i];
+
+ chan->attr.extended.ptr = extended_at;
+ extended_at += sizeof(struct lttng_channel_extended);
}
- return ret / sizeof(struct lttng_channel);
+ ret = (int) channel_count;
+end:
+ return ret;
}
/*
- * Ask the session daemon for all available events of a session channel.
- * Sets the contents of the events array.
- * Returns the number of lttng_event entries in events;
- * on error, returns a negative value.
+ * Ask the session daemon for all available events of a session channel.
+ * Sets the contents of the events array.
+ * Returns the number of lttng_event entries in events;
+ * on error, returns a negative value.
*/
int lttng_list_events(struct lttng_handle *handle,
const char *channel_name, struct lttng_event **events)
{
int ret;
- struct lttcomm_session_msg lsm;
+ struct lttcomm_session_msg lsm = {};
+ const struct lttcomm_event_command_header *cmd_header = NULL;
+ uint32_t nb_events, i;
+ const void *comm_ext_at;
+ struct lttng_dynamic_buffer listing;
+ size_t storage_req;
+ struct lttng_payload payload;
+ struct lttng_payload payload_copy;
+ struct lttng_payload_view lsm_view =
+ lttng_payload_view_init_from_buffer(
+ (const char *) &lsm, 0, sizeof(lsm));
+ struct lttng_buffer_view cmd_header_view;
+ struct lttng_buffer_view cmd_payload_view;
+ struct lttng_buffer_view flat_events_view;
+ struct lttng_buffer_view ext_view;
/* Safety check. An handle and channel name are mandatory */
if (handle == NULL || channel_name == NULL) {
- return -LTTNG_ERR_INVALID;
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
+ lttng_payload_init(&payload);
+ lttng_payload_init(&payload_copy);
+
lsm.cmd_type = LTTNG_LIST_EVENTS;
- copy_string(lsm.session.name, handle->session_name,
+ ret = lttng_strncpy(lsm.session.name, handle->session_name,
sizeof(lsm.session.name));
- copy_string(lsm.u.list.channel_name, channel_name,
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = lttng_strncpy(lsm.u.list.channel_name, channel_name,
sizeof(lsm.u.list.channel_name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
- copy_lttng_domain(&lsm.domain, &handle->domain);
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
- ret = ask_sessiond(&lsm, (void**) events);
+ ret = lttng_ctl_ask_sessiond_payload(&lsm_view, &payload);
if (ret < 0) {
- return ret;
+ goto end;
}
- return ret / sizeof(struct lttng_event);
+ /*
+ * A copy of the payload is performed since it will be
+ * consumed twice. Consuming the same payload twice is invalid since
+ * it will cause any received file descriptor to become "shared"
+ * between different instances of the resulting objects.
+ */
+ ret = lttng_payload_copy(&payload, &payload_copy);
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ cmd_header_view = lttng_buffer_view_from_dynamic_buffer(
+ &payload.buffer, 0, sizeof(*cmd_header));
+ if (!lttng_buffer_view_is_valid(&cmd_header_view)) {
+ ret = -LTTNG_ERR_INVALID_PROTOCOL;
+ goto end;
+ }
+
+ cmd_header = (typeof(cmd_header)) cmd_header_view.data;
+
+ /* Set number of events and free command header */
+ nb_events = cmd_header->nb_events;
+ if (nb_events > INT_MAX) {
+ ret = -LTTNG_ERR_OVERFLOW;
+ goto end;
+ }
+
+ cmd_payload_view = lttng_buffer_view_from_dynamic_buffer(
+ &payload.buffer, sizeof(*cmd_header), -1);
+
+ /*
+ * The buffer that is returned must contain a "flat" version of
+ * the events that are returned. In other words, all pointers
+ * within an lttng_event must point to a location within the returned
+ * buffer so that the user may free everything by simply calling free()
+ * on the returned buffer. This is needed in order to maintain API
+ * compatibility.
+ *
+ * A first pass is performed to compute the size of the buffer that
+ * must be allocated. A second pass is then performed to setup
+ * the returned events so that their members always point within the
+ * buffer.
+ *
+ * The layout of the returned buffer is as follows:
+ * - struct lttng_event[nb_events],
+ * - nb_events times the following:
+ * - struct lttng_event_extended,
+ * - flattened version of userspace_probe_location
+ * - filter_expression
+ * - exclusions
+ * - padding to align to 64-bits
+ */
+ ext_view = lttng_buffer_view_from_view(&cmd_payload_view,
+ nb_events * sizeof(struct lttng_event), -1);
+ comm_ext_at = ext_view.data;
+ storage_req = nb_events * sizeof(struct lttng_event);
+ {
+ struct lttng_payload_view payload_view =
+ lttng_payload_view_from_payload(&payload, 0, -1);
+
+ for (i = 0; i < nb_events; i++) {
+ const struct lttcomm_event_extended_header *ext_comm =
+ (struct lttcomm_event_extended_header *)
+ comm_ext_at;
+ int probe_storage_req = 0;
+
+ comm_ext_at += sizeof(*ext_comm);
+ comm_ext_at += ext_comm->filter_len;
+ comm_ext_at += ext_comm->nb_exclusions *
+ LTTNG_SYMBOL_NAME_LEN;
+
+ if (ext_comm->userspace_probe_location_len) {
+ struct lttng_userspace_probe_location
+ *probe_location = NULL;
+ struct lttng_payload_view probe_location_view = lttng_payload_view_from_view(
+ &payload_view,
+ (const char *) comm_ext_at -
+ payload_view.buffer.data,
+ ext_comm->userspace_probe_location_len);
+
+ if (!lttng_payload_view_is_valid(&probe_location_view)) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto end;
+ }
+
+ /*
+ * Create a temporary userspace probe location
+ * to determine the size needed by a "flattened"
+ * version of that same probe location.
+ */
+ ret = lttng_userspace_probe_location_create_from_payload(
+ &probe_location_view,
+ &probe_location);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto end;
+ }
+
+ ret = lttng_userspace_probe_location_flatten(
+ probe_location, NULL);
+ lttng_userspace_probe_location_destroy(
+ probe_location);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto end;
+ }
+
+ probe_storage_req = ret;
+ comm_ext_at += ext_comm->userspace_probe_location_len;
+ }
+
+ storage_req += sizeof(struct lttng_event_extended);
+ storage_req += ext_comm->filter_len;
+ storage_req += ext_comm->nb_exclusions *
+ LTTNG_SYMBOL_NAME_LEN;
+ /* Padding to ensure the flat probe is aligned. */
+ storage_req = ALIGN_TO(storage_req, sizeof(uint64_t));
+ storage_req += probe_storage_req;
+ }
+ }
+
+ lttng_dynamic_buffer_init(&listing);
+ /*
+ * We must ensure that "listing" is never resized so as to preserve
+ * the validity of the flattened objects.
+ */
+ ret = lttng_dynamic_buffer_set_capacity(&listing, storage_req);
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ cmd_payload_view = lttng_buffer_view_from_dynamic_buffer(
+ &payload_copy.buffer, sizeof(*cmd_header), -1);
+ flat_events_view = lttng_buffer_view_from_view(&cmd_payload_view, 0,
+ nb_events * sizeof(struct lttng_event));
+ ret = lttng_dynamic_buffer_append_view(&listing, &flat_events_view);
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+
+ ext_view = lttng_buffer_view_from_view(&cmd_payload_view,
+ nb_events * sizeof(struct lttng_event), -1);
+ comm_ext_at = ext_view.data;
+
+ {
+ struct lttng_payload_view payload_copy_view =
+ lttng_payload_view_from_payload(
+ &payload_copy, 0, -1);
+
+ for (i = 0; i < nb_events; i++) {
+ struct lttng_event *event = (typeof(event))(
+ listing.data +
+ (sizeof(struct lttng_event) * i));
+ const struct lttcomm_event_extended_header *ext_comm =
+ (typeof(ext_comm)) comm_ext_at;
+ struct lttng_event_extended *event_extended =
+ (typeof(event_extended))(listing.data +
+ listing.size);
+
+ /* Insert struct lttng_event_extended. */
+ ret = lttng_dynamic_buffer_set_size(&listing,
+ listing.size + sizeof(*event_extended));
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+ event->extended.ptr = event_extended;
+
+ comm_ext_at += sizeof(*ext_comm);
+
+ /* Insert filter expression. */
+ if (ext_comm->filter_len) {
+ event_extended->filter_expression =
+ listing.data + listing.size;
+ ret = lttng_dynamic_buffer_append(&listing,
+ comm_ext_at,
+ ext_comm->filter_len);
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+ comm_ext_at += ext_comm->filter_len;
+ }
+
+ /* Insert exclusions. */
+ if (ext_comm->nb_exclusions) {
+ event_extended->exclusions.count =
+ ext_comm->nb_exclusions;
+ event_extended->exclusions.strings =
+ listing.data + listing.size;
+
+ ret = lttng_dynamic_buffer_append(&listing,
+ comm_ext_at,
+ ext_comm->nb_exclusions *
+ LTTNG_SYMBOL_NAME_LEN);
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+ comm_ext_at += ext_comm->nb_exclusions *
+ LTTNG_SYMBOL_NAME_LEN;
+ }
+
+ /* Insert padding to align to 64-bits. */
+ ret = lttng_dynamic_buffer_set_size(&listing,
+ ALIGN_TO(listing.size,
+ sizeof(uint64_t)));
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+
+ /* Insert flattened userspace probe location. */
+ if (ext_comm->userspace_probe_location_len) {
+ struct lttng_userspace_probe_location
+ *probe_location = NULL;
+ struct lttng_payload_view probe_location_view = lttng_payload_view_from_view(
+ &payload_copy_view,
+ (const char *) comm_ext_at -
+ payload_copy_view.buffer.data,
+ ext_comm->userspace_probe_location_len);
+
+ if (!lttng_payload_view_is_valid(&probe_location_view)) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto free_dynamic_buffer;
+ }
+
+ ret = lttng_userspace_probe_location_create_from_payload(
+ &probe_location_view,
+ &probe_location);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto free_dynamic_buffer;
+ }
+
+ event_extended->probe_location = (struct lttng_userspace_probe_location
+ *) (listing.data +
+ listing.size);
+ ret = lttng_userspace_probe_location_flatten(
+ probe_location, &listing);
+ lttng_userspace_probe_location_destroy(
+ probe_location);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto free_dynamic_buffer;
+ }
+
+ comm_ext_at += ext_comm->userspace_probe_location_len;
+ }
+ }
+ }
+
+ /* Don't reset listing buffer as we return its content. */
+ *events = (struct lttng_event *) listing.data;
+ lttng_dynamic_buffer_init(&listing);
+ ret = (int) nb_events;
+free_dynamic_buffer:
+ lttng_dynamic_buffer_reset(&listing);
+end:
+ lttng_payload_reset(&payload);
+ lttng_payload_reset(&payload_copy);
+ return ret;
}
/*
*/
int lttng_set_tracing_group(const char *name)
{
+ char *new_group;
if (name == NULL) {
return -LTTNG_ERR_INVALID;
}
- if (asprintf(&tracing_group, "%s", name) < 0) {
+ if (asprintf(&new_group, "%s", name) < 0) {
return -LTTNG_ERR_FATAL;
}
+ free(tracing_group);
+ tracing_group = new_group;
+ new_group = NULL;
+
return 0;
}
-/*
- * Returns size of returned session payload data or a negative error code.
- */
int lttng_calibrate(struct lttng_handle *handle,
struct lttng_calibrate *calibrate)
{
- struct lttcomm_session_msg lsm;
-
- /* Safety check. NULL pointer are forbidden */
- if (handle == NULL || calibrate == NULL) {
- return -LTTNG_ERR_INVALID;
- }
-
- lsm.cmd_type = LTTNG_CALIBRATE;
- copy_lttng_domain(&lsm.domain, &handle->domain);
-
- memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
-
- return ask_sessiond(&lsm, NULL);
+ /*
+ * This command was removed in LTTng 2.9.
+ */
+ return -LTTNG_ERR_UND;
}
/*
void lttng_channel_set_default_attr(struct lttng_domain *domain,
struct lttng_channel_attr *attr)
{
+ struct lttng_channel_extended *extended;
+
/* Safety check */
if (attr == NULL || domain == NULL) {
return;
}
+ extended = (struct lttng_channel_extended *) attr->extended.ptr;
memset(attr, 0, sizeof(struct lttng_channel_attr));
+ /* Same for all domains. */
+ attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
+ attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
+ attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
+
switch (domain->type) {
case LTTNG_DOMAIN_KERNEL:
- attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
- attr->switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
- attr->read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
-
- attr->subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE;
+ attr->switch_timer_interval =
+ DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
+ attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
+ attr->subbuf_size = default_get_kernel_channel_subbuf_size();
attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
+ if (extended) {
+ extended->monitor_timer_interval =
+ DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER;
+ extended->blocking_timeout =
+ DEFAULT_KERNEL_CHANNEL_BLOCKING_TIMEOUT;
+ }
break;
case LTTNG_DOMAIN_UST:
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
- attr->switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
- attr->read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
-
- attr->subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE;
- attr->num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM;
- attr->output = DEFAULT_UST_CHANNEL_OUTPUT;
- break;
+ switch (domain->buf_type) {
+ case LTTNG_BUFFER_PER_UID:
+ attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
+ attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
+ attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
+ attr->switch_timer_interval =
+ DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
+ attr->read_timer_interval =
+ DEFAULT_UST_UID_CHANNEL_READ_TIMER;
+ if (extended) {
+ extended->monitor_timer_interval =
+ DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER;
+ extended->blocking_timeout =
+ DEFAULT_UST_UID_CHANNEL_BLOCKING_TIMEOUT;
+ }
+ break;
+ case LTTNG_BUFFER_PER_PID:
+ default:
+ attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
+ attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
+ attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
+ attr->switch_timer_interval =
+ DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
+ attr->read_timer_interval =
+ DEFAULT_UST_PID_CHANNEL_READ_TIMER;
+ if (extended) {
+ extended->monitor_timer_interval =
+ DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER;
+ extended->blocking_timeout =
+ DEFAULT_UST_PID_CHANNEL_BLOCKING_TIMEOUT;
+ }
+ break;
+ }
default:
/* Default behavior: leave set to 0. */
break;
}
+
+ attr->extended.ptr = extended;
+}
+
+int lttng_channel_get_discarded_event_count(struct lttng_channel *channel,
+ uint64_t *discarded_events)
+{
+ int ret = 0;
+ struct lttng_channel_extended *chan_ext;
+
+ if (!channel || !discarded_events) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ chan_ext = channel->attr.extended.ptr;
+ if (!chan_ext) {
+ /*
+ * This can happen since the lttng_channel structure is
+ * used for other tasks where this pointer is never set.
+ */
+ *discarded_events = 0;
+ goto end;
+ }
+
+ *discarded_events = chan_ext->discarded_events;
+end:
+ return ret;
+}
+
+int lttng_channel_get_lost_packet_count(struct lttng_channel *channel,
+ uint64_t *lost_packets)
+{
+ int ret = 0;
+ struct lttng_channel_extended *chan_ext;
+
+ if (!channel || !lost_packets) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ chan_ext = channel->attr.extended.ptr;
+ if (!chan_ext) {
+ /*
+ * This can happen since the lttng_channel structure is
+ * used for other tasks where this pointer is never set.
+ */
+ *lost_packets = 0;
+ goto end;
+ }
+
+ *lost_packets = chan_ext->lost_packets;
+end:
+ return ret;
+}
+
+int lttng_channel_get_monitor_timer_interval(struct lttng_channel *chan,
+ uint64_t *monitor_timer_interval)
+{
+ int ret = 0;
+
+ if (!chan || !monitor_timer_interval) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (!chan->attr.extended.ptr) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ *monitor_timer_interval = ((struct lttng_channel_extended *)
+ chan->attr.extended.ptr)->monitor_timer_interval;
+end:
+ return ret;
+}
+
+int lttng_channel_set_monitor_timer_interval(struct lttng_channel *chan,
+ uint64_t monitor_timer_interval)
+{
+ int ret = 0;
+
+ if (!chan || !chan->attr.extended.ptr) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ((struct lttng_channel_extended *)
+ chan->attr.extended.ptr)->monitor_timer_interval =
+ monitor_timer_interval;
+end:
+ return ret;
+}
+
+int lttng_channel_get_blocking_timeout(struct lttng_channel *chan,
+ int64_t *blocking_timeout)
+{
+ int ret = 0;
+
+ if (!chan || !blocking_timeout) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (!chan->attr.extended.ptr) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ *blocking_timeout = ((struct lttng_channel_extended *)
+ chan->attr.extended.ptr)->blocking_timeout;
+end:
+ return ret;
+}
+
+int lttng_channel_set_blocking_timeout(struct lttng_channel *chan,
+ int64_t blocking_timeout)
+{
+ int ret = 0;
+ int64_t msec_timeout;
+
+ if (!chan || !chan->attr.extended.ptr) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (blocking_timeout < 0 && blocking_timeout != -1) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /*
+ * LTTng-ust's use of poll() to implement this timeout mechanism forces
+ * us to accept a narrower range of values (msecs expressed as a signed
+ * 32-bit integer).
+ */
+ msec_timeout = blocking_timeout / 1000;
+ if (msec_timeout != (int32_t) msec_timeout) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ((struct lttng_channel_extended *)
+ chan->attr.extended.ptr)->blocking_timeout =
+ blocking_timeout;
+end:
+ return ret;
}
/*
ret = set_session_daemon_path();
if (ret < 0) {
- /* Error */
+ /* Error. */
return ret;
}
- if (strlen(sessiond_sock_path) == 0) {
+ if (*sessiond_sock_path == '\0') {
/*
- * No socket path set. Weird error which means the constructor was not
- * called.
+ * No socket path set. Weird error which means the constructor
+ * was not called.
*/
assert(0);
}
ret = try_connect_sessiond(sessiond_sock_path);
if (ret < 0) {
- /* Not alive */
+ /* Not alive. */
return 0;
}
- /* Is alive */
+ /* Is alive. */
return 1;
}
int lttng_set_consumer_url(struct lttng_handle *handle,
const char *control_url, const char *data_url)
{
+ int ret;
ssize_t size;
struct lttcomm_session_msg lsm;
struct lttng_uri *uris = NULL;
if (handle == NULL || (control_url == NULL && data_url == NULL)) {
- return -LTTNG_ERR_INVALID;
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
}
memset(&lsm, 0, sizeof(lsm));
lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
- copy_string(lsm.session.name, handle->session_name,
+ ret = lttng_strncpy(lsm.session.name, handle->session_name,
sizeof(lsm.session.name));
- copy_lttng_domain(&lsm.domain, &handle->domain);
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
- size = parse_str_urls_to_uri(control_url, data_url, &uris);
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
+
+ size = uri_parse_str_urls(control_url, data_url, &uris);
if (size < 0) {
- return -LTTNG_ERR_INVALID;
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
}
lsm.u.uri.size = size;
- return ask_sessiond_varlen(&lsm, uris, sizeof(struct lttng_uri) * size,
- NULL);
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
+ sizeof(struct lttng_uri) * size, NULL);
+
+ free(uris);
+error:
+ return ret;
}
/*
- * Enable consumer for a session and domain.
- *
- * Return 0 on success, else a negative value.
+ * [OBSOLETE]
*/
+int lttng_enable_consumer(struct lttng_handle *handle);
int lttng_enable_consumer(struct lttng_handle *handle)
{
+ return -ENOSYS;
+}
+
+/*
+ * [OBSOLETE]
+ */
+int lttng_disable_consumer(struct lttng_handle *handle);
+int lttng_disable_consumer(struct lttng_handle *handle)
+{
+ return -ENOSYS;
+}
+
+/*
+ * [OBSOLETE]
+ */
+int _lttng_create_session_ext(const char *name, const char *url,
+ const char *datetime);
+int _lttng_create_session_ext(const char *name, const char *url,
+ const char *datetime)
+{
+ return -ENOSYS;
+}
+
+/*
+ * For a given session name, this call checks if the data is ready to be read
+ * or is still being extracted by the consumer(s) hence not ready to be used by
+ * any readers.
+ */
+int lttng_data_pending(const char *session_name)
+{
+ int ret;
struct lttcomm_session_msg lsm;
+ uint8_t *pending = NULL;
- if (handle == NULL) {
+ if (session_name == NULL) {
return -LTTNG_ERR_INVALID;
}
- lsm.cmd_type = LTTNG_ENABLE_CONSUMER;
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_DATA_PENDING;
- copy_string(lsm.session.name, handle->session_name,
+ ret = lttng_strncpy(lsm.session.name, session_name,
sizeof(lsm.session.name));
- copy_lttng_domain(&lsm.domain, &handle->domain);
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pending);
+ if (ret < 0) {
+ goto end;
+ } else if (ret != 1) {
+ /* Unexpected payload size */
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ } else if (!pending) {
+ /* Internal error. */
+ ret = -LTTNG_ERR_UNK;
+ goto end;
+ }
- return ask_sessiond(&lsm, NULL);
+ ret = (int) *pending;
+end:
+ free(pending);
+ return ret;
}
/*
- * Disable consumer for a session and domain.
- *
- * Return 0 on success, else a negative value.
+ * Regenerate the metadata for a session.
+ * Return 0 on success, a negative error code on error.
*/
-int lttng_disable_consumer(struct lttng_handle *handle)
+int lttng_regenerate_metadata(const char *session_name)
{
+ int ret;
struct lttcomm_session_msg lsm;
- if (handle == NULL) {
- return -LTTNG_ERR_INVALID;
+ if (!session_name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
- lsm.cmd_type = LTTNG_DISABLE_CONSUMER;
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_REGENERATE_METADATA;
- copy_string(lsm.session.name, handle->session_name,
+ ret = lttng_strncpy(lsm.session.name, session_name,
sizeof(lsm.session.name));
- copy_lttng_domain(&lsm.domain, &handle->domain);
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+ if (ret < 0) {
+ goto end;
+ }
- return ask_sessiond(&lsm, NULL);
+ ret = 0;
+end:
+ return ret;
}
/*
- * Set health socket path by putting it in the global health_sock_path
- * variable.
- *
- * Returns 0 on success or assert(0) on ENOMEM.
+ * Deprecated, replaced by lttng_regenerate_metadata.
+ */
+int lttng_metadata_regenerate(const char *session_name)
+{
+ return lttng_regenerate_metadata(session_name);
+}
+
+/*
+ * Regenerate the statedump of a session.
+ * Return 0 on success, a negative error code on error.
*/
-static int set_health_socket_path(void)
+int lttng_regenerate_statedump(const char *session_name)
{
int ret;
- int in_tgroup = 0; /* In tracing group */
- uid_t uid;
- const char *home;
+ struct lttcomm_session_msg lsm;
- uid = getuid();
+ if (!session_name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
- if (uid != 0) {
- /* Are we in the tracing group ? */
- in_tgroup = check_tracing_group(tracing_group);
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_REGENERATE_STATEDUMP;
+
+ ret = lttng_strncpy(lsm.session.name, session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
- if ((uid == 0) || in_tgroup) {
- copy_string(health_sock_path, DEFAULT_GLOBAL_HEALTH_UNIX_SOCK,
- sizeof(health_sock_path));
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+ if (ret < 0) {
+ goto end;
}
- if (uid != 0) {
+ ret = 0;
+end:
+ return ret;
+}
+
+static
+int _lttng_register_trigger(struct lttng_trigger *trigger, const char *name,
+ bool generate_name)
+{
+ int ret;
+ struct lttcomm_session_msg lsm = {
+ .cmd_type = LTTNG_REGISTER_TRIGGER,
+ .u.trigger.is_trigger_anonymous = !name && !generate_name,
+ };
+ struct lttcomm_session_msg *message_lsm;
+ struct lttng_payload message;
+ struct lttng_payload reply;
+ struct lttng_trigger *reply_trigger = NULL;
+ enum lttng_domain_type domain_type;
+ const struct lttng_credentials user_creds = {
+ .uid = LTTNG_OPTIONAL_INIT_VALUE(geteuid()),
+ .gid = LTTNG_OPTIONAL_INIT_UNSET,
+ };
+ const char *unused_trigger_name = NULL;
+ enum lttng_trigger_status trigger_status;
+
+ lttng_payload_init(&message);
+ lttng_payload_init(&reply);
+
+ if (!trigger) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ trigger_status = lttng_trigger_get_name(trigger, &unused_trigger_name);
+ if (trigger_status != LTTNG_TRIGGER_STATUS_UNSET) {
+ /* Re-using already registered trigger. */
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (name) {
+ trigger_status = lttng_trigger_set_name(trigger, name);
+ if (trigger_status != LTTNG_TRIGGER_STATUS_OK) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+ }
+
+ if (!trigger->creds.uid.is_set) {
+ /* Use the client's credentials as the trigger credentials. */
+ lttng_trigger_set_credentials(trigger, &user_creds);
+ } else {
/*
- * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
- * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
+ * Validate that either the current trigger credentials and the
+ * client credentials are identical or that the current user is
+ * root. The root user can register, unregister triggers for
+ * himself and other users.
+ *
+ * This check is also present on the sessiond side, using the
+ * credentials passed on the socket. These check are all
+ * "safety" checks.
*/
- home = getenv("HOME");
- if (home == NULL) {
- /* Fallback in /tmp .. */
- home = "/tmp";
+ const struct lttng_credentials *trigger_creds =
+ lttng_trigger_get_credentials(trigger);
+
+ if (!lttng_credentials_is_equal_uid(trigger_creds, &user_creds)) {
+ if (lttng_credentials_get_uid(&user_creds) != 0) {
+ ret = -LTTNG_ERR_EPERM;
+ goto end_unset_name;
+ }
+ }
+ }
+
+ if (!lttng_trigger_validate(trigger)) {
+ ret = -LTTNG_ERR_INVALID_TRIGGER;
+ goto end_unset_name;
+ }
+
+ domain_type = lttng_trigger_get_underlying_domain_type_restriction(
+ trigger);
+
+ lsm.domain.type = domain_type;
+
+ ret = lttng_dynamic_buffer_append(&message.buffer, &lsm, sizeof(lsm));
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end_unset_name;
+ }
+
+ ret = lttng_trigger_serialize(trigger, &message);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_UNK;
+ goto end_unset_name;
+ }
+
+ /*
+ * This is needed to populate the trigger object size for the command
+ * header.
+ */
+ message_lsm = (struct lttcomm_session_msg *) message.buffer.data;
+
+ message_lsm->u.trigger.length = (uint32_t) message.buffer.size - sizeof(lsm);
+
+ {
+ struct lttng_payload_view message_view =
+ lttng_payload_view_from_payload(
+ &message, 0, -1);
+
+ message_lsm->fd_count = lttng_payload_view_get_fd_handle_count(
+ &message_view);
+ ret = lttng_ctl_ask_sessiond_payload(&message_view, &reply);
+ if (ret < 0) {
+ goto end_unset_name;
+ }
+ }
+
+ {
+ struct lttng_payload_view reply_view =
+ lttng_payload_view_from_payload(
+ &reply, 0, reply.buffer.size);
+
+ ret = lttng_trigger_create_from_payload(
+ &reply_view, &reply_trigger);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_INVALID_PROTOCOL;
+ goto end_unset_name;
}
+ }
- ret = snprintf(health_sock_path, sizeof(health_sock_path),
- DEFAULT_HOME_HEALTH_UNIX_SOCK, home);
- if ((ret < 0) || (ret >= sizeof(health_sock_path))) {
- /* ENOMEM at this point... just kill the control lib. */
- assert(0);
+ if (name || generate_name) {
+ ret = lttng_trigger_assign_name(trigger, reply_trigger);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
}
}
- return 0;
+ ret = 0;
+ goto end;
+
+end_unset_name:
+ trigger_status = lttng_trigger_set_name(trigger, NULL);
+ if (trigger_status != LTTNG_TRIGGER_STATUS_OK) {
+ ret = -LTTNG_ERR_UNK;
+ }
+end:
+ lttng_payload_reset(&message);
+ lttng_payload_reset(&reply);
+ lttng_trigger_destroy(reply_trigger);
+ return ret;
}
-/*
- * Check session daemon health for a specific health component.
- *
- * Return 0 if health is OK or else 1 if BAD.
- *
- * Any other negative value is a lttng error code which can be translated with
- * lttng_strerror().
- */
-int lttng_health_check(enum lttng_health_component c)
+int lttng_register_trigger(struct lttng_trigger *trigger)
{
- int sock, ret;
- struct lttcomm_health_msg msg;
- struct lttcomm_health_data reply;
+ /* Register an anonymous trigger. */
+ return _lttng_register_trigger(trigger, NULL, false);
+}
- /* Connect to the sesssion daemon */
- sock = lttcomm_connect_unix_sock(health_sock_path);
- if (sock < 0) {
- ret = -LTTNG_ERR_NO_SESSIOND;
- goto error;
+enum lttng_error_code lttng_register_trigger_with_name(
+ struct lttng_trigger *trigger, const char *name)
+{
+ const int ret = _lttng_register_trigger(trigger, name, false);
+
+ return ret == 0 ? LTTNG_OK : (enum lttng_error_code) -ret;
+}
+
+enum lttng_error_code lttng_register_trigger_with_automatic_name(
+ struct lttng_trigger *trigger)
+{
+ const int ret = _lttng_register_trigger(trigger, false, true);
+
+ return ret == 0 ? LTTNG_OK : (enum lttng_error_code) -ret;
+}
+
+enum lttng_error_code lttng_error_query_execute(
+ const struct lttng_error_query *query,
+ const struct lttng_endpoint *endpoint,
+ struct lttng_error_query_results **results)
+{
+ int ret;
+ enum lttng_error_code ret_code;
+ struct lttcomm_session_msg lsm = {
+ .cmd_type = LTTNG_EXECUTE_ERROR_QUERY,
+ };
+ struct lttng_payload message;
+ struct lttng_payload reply;
+ struct lttcomm_session_msg *message_lsm;
+
+ lttng_payload_init(&message);
+ lttng_payload_init(&reply);
+
+ if (!query || !results) {
+ ret_code = LTTNG_ERR_INVALID;
+ goto end;
}
- msg.cmd = LTTNG_HEALTH_CHECK;
- msg.component = c;
+ if (endpoint != lttng_session_daemon_command_endpoint) {
+ ret_code = LTTNG_ERR_INVALID_ERROR_QUERY_TARGET;
+ goto end;
+ }
- ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg));
- if (ret < 0) {
- ret = -LTTNG_ERR_FATAL;
- goto close_error;
+ ret = lttng_dynamic_buffer_append(&message.buffer, &lsm, sizeof(lsm));
+ if (ret) {
+ ret_code = LTTNG_ERR_NOMEM;
+ goto end;
}
- ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply));
- if (ret < 0) {
- ret = -LTTNG_ERR_FATAL;
- goto close_error;
+ ret = lttng_error_query_serialize(query, &message);
+ if (ret) {
+ ret_code = LTTNG_ERR_UNK;
+ goto end;
}
- ret = reply.ret_code;
+ message_lsm = (struct lttcomm_session_msg *) message.buffer.data;
+ message_lsm->u.error_query.length =
+ (uint32_t) message.buffer.size - sizeof(lsm);
-close_error:
- close(sock);
+ {
+ struct lttng_payload_view message_view =
+ lttng_payload_view_from_payload(
+ &message, 0, -1);
-error:
- return ret;
+ message_lsm->fd_count = lttng_payload_view_get_fd_handle_count(
+ &message_view);
+ ret = lttng_ctl_ask_sessiond_payload(&message_view, &reply);
+ if (ret < 0) {
+ ret_code = -ret;
+ goto end;
+ }
+ }
+
+ {
+ ssize_t reply_create_ret;
+ struct lttng_payload_view reply_view =
+ lttng_payload_view_from_payload(
+ &reply, 0, reply.buffer.size);
+
+ reply_create_ret = lttng_error_query_results_create_from_payload(
+ &reply_view, results);
+ if (reply_create_ret < 0) {
+ ret_code = LTTNG_ERR_INVALID_PROTOCOL;
+ goto end;
+ }
+ }
+
+ ret_code = LTTNG_OK;
+end:
+ lttng_payload_reset(&message);
+ lttng_payload_reset(&reply);
+ return ret_code;
}
-/*
- * This is an extension of create session that is ONLY and SHOULD only be used
- * by the lttng command line program. It exists to avoid using URI parsing in
- * the lttng client.
- *
- * We need the date and time for the trace path subdirectory for the case where
- * the user does NOT define one using either -o or -U. Using the normal
- * lttng_create_session API call, we have no clue on the session daemon side if
- * the URL was generated automatically by the client or define by the user.
- *
- * So this function "wrapper" is hidden from the public API, takes the datetime
- * string and appends it if necessary to the URI subdirectory before sending it
- * to the session daemon.
- *
- * With this extra function, the lttng_create_session call behavior is not
- * changed and the timestamp is appended to the URI on the session daemon side
- * if necessary.
- */
-int _lttng_create_session_ext(const char *name, const char *url,
- const char *datetime)
+int lttng_unregister_trigger(const struct lttng_trigger *trigger)
{
int ret;
- ssize_t size;
struct lttcomm_session_msg lsm;
- struct lttng_uri *uris = NULL;
+ struct lttcomm_session_msg *message_lsm;
+ struct lttng_payload message;
+ struct lttng_payload reply;
+ struct lttng_trigger *copy = NULL;
+ const struct lttng_credentials user_creds = {
+ .uid = LTTNG_OPTIONAL_INIT_VALUE(geteuid()),
+ .gid = LTTNG_OPTIONAL_INIT_UNSET,
+ };
+
+ lttng_payload_init(&message);
+ lttng_payload_init(&reply);
+
+ if (!trigger) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
- if (name == NULL || datetime == NULL) {
- return -LTTNG_ERR_INVALID;
+ copy = lttng_trigger_copy(trigger);
+ if (!copy) {
+ ret = -LTTNG_ERR_UNK;
+ goto end;
+ }
+
+ if (!copy->creds.uid.is_set) {
+ /* Use the client credentials as the trigger credentials */
+ lttng_trigger_set_credentials(copy, &user_creds);
+ } else {
+ /*
+ * Validate that either the current trigger credentials and the
+ * client credentials are identical or that the current user is
+ * root. The root user can register, unregister triggers for
+ * himself and other users.
+ *
+ * This check is also present on the sessiond side, using the
+ * credentials passed on the socket. These check are all
+ * "safety" checks.
+ */
+ const struct lttng_credentials *trigger_creds =
+ lttng_trigger_get_credentials(copy);
+ if (!lttng_credentials_is_equal_uid(trigger_creds, &user_creds)) {
+ if (lttng_credentials_get_uid(&user_creds) != 0) {
+ ret = -LTTNG_ERR_EPERM;
+ goto end;
+ }
+ }
+ }
+
+ if (!lttng_trigger_validate(copy)) {
+ ret = -LTTNG_ERR_INVALID_TRIGGER;
+ goto end;
}
memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_UNREGISTER_TRIGGER;
- lsm.cmd_type = LTTNG_CREATE_SESSION;
- if (!strncmp(name, DEFAULT_SESSION_NAME, strlen(DEFAULT_SESSION_NAME))) {
- ret = snprintf(lsm.session.name, sizeof(lsm.session.name), "%s-%s",
- name, datetime);
- if (ret < 0) {
- PERROR("snprintf session name datetime");
- return -LTTNG_ERR_FATAL;
- }
- } else {
- copy_string(lsm.session.name, name, sizeof(lsm.session.name));
+ ret = lttng_dynamic_buffer_append(&message.buffer, &lsm, sizeof(lsm));
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
}
- /* There should never be a data URL */
- size = parse_str_urls_to_uri(url, NULL, &uris);
- if (size < 0) {
- return -LTTNG_ERR_INVALID;
+ ret = lttng_trigger_serialize(copy, &message);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_UNK;
+ goto end;
}
- lsm.u.uri.size = size;
+ /*
+ * This is needed to populate the trigger object size for the command
+ * header and number of fds sent.
+ */
+ message_lsm = (struct lttcomm_session_msg *) message.buffer.data;
+
+ message_lsm->u.trigger.length = (uint32_t) message.buffer.size - sizeof(lsm);
+
+ {
+ struct lttng_payload_view message_view =
+ lttng_payload_view_from_payload(
+ &message, 0, -1);
+
+ /*
+ * Update the message header with the number of fd that will be
+ * sent.
+ */
+ message_lsm->fd_count = lttng_payload_view_get_fd_handle_count(
+ &message_view);
- if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
- ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s", name,
- datetime);
+ ret = lttng_ctl_ask_sessiond_payload(&message_view, &reply);
if (ret < 0) {
- PERROR("snprintf uri subdir");
- return -LTTNG_ERR_FATAL;
+ goto end;
}
}
- return ask_sessiond_varlen(&lsm, uris, sizeof(struct lttng_uri) * size,
- NULL);
+ ret = 0;
+end:
+ lttng_trigger_destroy(copy);
+ lttng_payload_reset(&message);
+ lttng_payload_reset(&reply);
+ return ret;
}
/*
- * For a given session name, this call checks if the data is ready to be read
- * or is still being extracted by the consumer(s) hence not ready to be used by
- * any readers.
+ * Ask the session daemon for all registered triggers for the current user.
+ *
+ * Allocates and return an lttng_triggers set.
+ * On error, returns a suitable lttng_error_code.
*/
-int lttng_data_pending(const char *session_name)
+enum lttng_error_code lttng_list_triggers(struct lttng_triggers **triggers)
{
int ret;
- struct lttcomm_session_msg lsm;
-
- if (session_name == NULL) {
- return -LTTNG_ERR_INVALID;
- }
+ enum lttng_error_code ret_code = LTTNG_OK;
+ struct lttcomm_session_msg lsm = { .cmd_type = LTTNG_LIST_TRIGGERS };
+ struct lttng_triggers *local_triggers = NULL;
+ struct lttng_payload reply;
+ struct lttng_payload_view lsm_view =
+ lttng_payload_view_init_from_buffer(
+ (const char *) &lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_DATA_PENDING;
+ lttng_payload_init(&reply);
- copy_string(lsm.session.name, session_name, sizeof(lsm.session.name));
+ ret = lttng_ctl_ask_sessiond_payload(&lsm_view, &reply);
+ if (ret < 0) {
+ ret_code = (enum lttng_error_code) -ret;
+ goto end;
+ }
- ret = ask_sessiond(&lsm, NULL);
+ {
+ struct lttng_payload_view reply_view =
+ lttng_payload_view_from_payload(
+ &reply, 0, reply.buffer.size);
- /*
- * The ask_sessiond function negate the return code if it's not LTTNG_OK so
- * getting -1 means that the reply ret_code was 1 thus meaning that the
- * data is available. Yes it is hackish but for now this is the only way.
- */
- if (ret == -1) {
- ret = 1;
+ ret = lttng_triggers_create_from_payload(
+ &reply_view, &local_triggers);
+ if (ret < 0) {
+ ret_code = LTTNG_ERR_FATAL;
+ goto end;
+ }
}
- return ret;
+ *triggers = local_triggers;
+ local_triggers = NULL;
+end:
+ lttng_payload_reset(&reply);
+ lttng_triggers_destroy(local_triggers);
+ return ret_code;
}
/*
- * lib constructor
+ * lib constructor.
*/
-static void __attribute__((constructor)) init()
+static void __attribute__((constructor)) init(void)
{
/* Set default session group */
lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
- /* Set socket for health check */
- (void) set_health_socket_path();
}
/*
- * lib destructor
+ * lib destructor.
*/
-static void __attribute__((destructor)) lttng_ctl_exit()
+static void __attribute__((destructor)) lttng_ctl_exit(void)
{
free(tracing_group);
}