From: Michael Jeanson Date: Fri, 2 Apr 2021 23:35:53 +0000 (-0400) Subject: Move libustcomm to 'src/common/' X-Git-Tag: v2.13.0-rc1~130 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=67534785e151f4c78aa5697703c55c5193deb65c;p=lttng-ust.git Move libustcomm to 'src/common/' libustcomm is an internal convience library used by both liblttng-ust and liblttng-ust-ctl, move it to the common directory. This is part of an effort to standardize our autotools setup across projects to simplify maintenance. Change-Id: I6ec03e5d4fb0f49dee4dc57ba16ee025dd1151a2 Signed-off-by: Michael Jeanson Signed-off-by: Mathieu Desnoyers --- diff --git a/.gitignore b/.gitignore index 2dc1914c..3475a8fc 100644 --- a/.gitignore +++ b/.gitignore @@ -125,7 +125,6 @@ cscope.* /doc/man/Makefile /include/Makefile /src/common/Makefile -/src/liblttng-ust-comm/Makefile /src/lib/lttng-ust-ctl/Makefile /src/lib/lttng-ust-cyg-profile/Makefile /src/lib/lttng-ust-dl/Makefile diff --git a/configure.ac b/configure.ac index 21dee733..561eb08c 100644 --- a/configure.ac +++ b/configure.ac @@ -519,7 +519,6 @@ AC_CONFIG_FILES([ doc/man/Makefile include/Makefile src/common/Makefile - src/liblttng-ust-comm/Makefile src/lib/lttng-ust-ctl/Makefile src/lib/lttng-ust-cyg-profile/Makefile src/lib/lttng-ust-dl/Makefile diff --git a/src/Makefile.am b/src/Makefile.am index 5f958375..80fc8c3f 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -2,7 +2,6 @@ SUBDIRS = \ common \ - liblttng-ust-comm \ liblttng-ust \ lib diff --git a/src/common/Makefile.am b/src/common/Makefile.am index 2fbc8fff..fdbbc05c 100644 --- a/src/common/Makefile.am +++ b/src/common/Makefile.am @@ -15,8 +15,7 @@ noinst_HEADERS = \ logging.h \ macros.h \ patient.h \ - safe-snprintf.h \ - ustcomm.h + safe-snprintf.h noinst_HEADERS += \ compat/dlfcn.h \ @@ -42,7 +41,8 @@ noinst_LTLIBRARIES = \ msgpack/libmsgpack.la \ libringbuffer.la \ snprintf/libsnprintf.la \ - libcommon.la + libcommon.la \ + libustcomm.la # counter libcounter_la_SOURCES = \ @@ -133,4 +133,8 @@ libcommon_la_LIBADD = \ msgpack/libmsgpack.la \ snprintf/libsnprintf.la +libustcomm_la_SOURCES = \ + ustcomm.c \ + ustcomm.h + EXTRA_DIST = snprintf/README diff --git a/src/common/ustcomm.c b/src/common/ustcomm.c new file mode 100644 index 00000000..2d445cba --- /dev/null +++ b/src/common/ustcomm.c @@ -0,0 +1,1773 @@ +/* + * SPDX-License-Identifier: LGPL-2.1-only + * + * Copyright (C) 2011 David Goulet + * Copyright (C) 2011-2013 Mathieu Desnoyers + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include "common/ustcomm.h" +#include "common/ust-fd.h" +#include "common/macros.h" +#include +#include "common/dynamic-type.h" +#include "common/logging.h" + +#include "../liblttng-ust/ust-events-internal.h" +#include "../liblttng-ust/compat.h" + +#define USTCOMM_CODE_OFFSET(code) \ + (code == LTTNG_UST_OK ? 0 : (code - LTTNG_UST_ERR + 1)) + +#define USTCOMM_MAX_SEND_FDS 4 + +static +ssize_t count_fields_recursive(size_t nr_fields, + const struct lttng_ust_event_field **lttng_fields); +static +int serialize_one_field(struct lttng_ust_session *session, + struct ustctl_field *fields, size_t *iter_output, + const struct lttng_ust_event_field *lf); +static +int serialize_fields(struct lttng_ust_session *session, + struct ustctl_field *ustctl_fields, + size_t *iter_output, size_t nr_lttng_fields, + const struct lttng_ust_event_field **lttng_fields); + +/* + * Human readable error message. + */ +static const char *ustcomm_readable_code[] = { + [ USTCOMM_CODE_OFFSET(LTTNG_UST_OK) ] = "Success", + [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR) ] = "Unknown error", + [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_NOENT) ] = "No entry", + [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_EXIST) ] = "Object already exists", + [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL) ] = "Invalid argument", + [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_PERM) ] = "Permission denied", + [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_NOSYS) ] = "Not implemented", + [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_EXITING) ] = "Process is exiting", + + [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL_MAGIC) ] = "Invalid magic number", + [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL_SOCKET_TYPE) ] = "Invalid socket type", + [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_UNSUP_MAJOR) ] = "Unsupported major version", + [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_PEERCRED) ] = "Cannot get unix socket peer credentials", + [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_PEERCRED_PID) ] = "Peer credentials PID is invalid. Socket appears to belong to a distinct, non-nested pid namespace.", +}; + +/* + * lttng_ust_strerror + * @code: must be a negative value of enum lttng_ust_error_code (or 0). + * + * Returns a ptr to a string representing a human readable error code from the + * ustcomm_return_code enum. + */ +const char *lttng_ust_strerror(int code) +{ + code = -code; + + if (code < LTTNG_UST_OK || code >= LTTNG_UST_ERR_NR) + code = LTTNG_UST_ERR; + + return ustcomm_readable_code[USTCOMM_CODE_OFFSET(code)]; +} + +/* + * ustcomm_connect_unix_sock + * + * Connect to unix socket using the path name. + * + * Caller handles FD tracker. + */ +int ustcomm_connect_unix_sock(const char *pathname, long timeout) +{ + struct sockaddr_un sun; + int fd, ret; + + /* + * libust threads require the close-on-exec flag for all + * resources so it does not leak file descriptors upon exec. + * SOCK_CLOEXEC is not used since it is linux specific. + */ + fd = socket(PF_UNIX, SOCK_STREAM, 0); + if (fd < 0) { + PERROR("socket"); + ret = -errno; + goto error; + } + if (timeout >= 0) { + /* Give at least 10ms. */ + if (timeout < 10) + timeout = 10; + ret = ustcomm_setsockopt_snd_timeout(fd, timeout); + if (ret < 0) { + WARN("Error setting connect socket send timeout"); + } + } + ret = fcntl(fd, F_SETFD, FD_CLOEXEC); + if (ret < 0) { + PERROR("fcntl"); + ret = -errno; + goto error_fcntl; + } + + memset(&sun, 0, sizeof(sun)); + sun.sun_family = AF_UNIX; + strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); + sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; + + ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun)); + if (ret < 0) { + /* + * Don't print message on connect ENOENT error, because + * connect is used in normal execution to detect if + * sessiond is alive. ENOENT is when the unix socket + * file does not exist, and ECONNREFUSED is when the + * file exists but no sessiond is listening. + */ + if (errno != ECONNREFUSED && errno != ECONNRESET + && errno != ENOENT && errno != EACCES) + PERROR("connect"); + ret = -errno; + if (ret == -ECONNREFUSED || ret == -ECONNRESET) + ret = -EPIPE; + goto error_connect; + } + + return fd; + +error_connect: +error_fcntl: + { + int closeret; + + closeret = close(fd); + if (closeret) + PERROR("close"); + } +error: + return ret; +} + +/* + * ustcomm_accept_unix_sock + * + * Do an accept(2) on the sock and return the + * new file descriptor. The socket MUST be bind(2) before. + */ +int ustcomm_accept_unix_sock(int sock) +{ + int new_fd; + struct sockaddr_un sun; + socklen_t len = 0; + + /* Blocking call */ + new_fd = accept(sock, (struct sockaddr *) &sun, &len); + if (new_fd < 0) { + if (errno != ECONNABORTED) + PERROR("accept"); + new_fd = -errno; + if (new_fd == -ECONNABORTED) + new_fd = -EPIPE; + } + return new_fd; +} + +/* + * ustcomm_create_unix_sock + * + * Creates a AF_UNIX local socket using pathname + * bind the socket upon creation and return the fd. + */ +int ustcomm_create_unix_sock(const char *pathname) +{ + struct sockaddr_un sun; + int fd, ret; + + /* Create server socket */ + if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { + PERROR("socket"); + ret = -errno; + goto error; + } + + memset(&sun, 0, sizeof(sun)); + sun.sun_family = AF_UNIX; + strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); + sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; + + /* Unlink the old file if present */ + (void) unlink(pathname); + ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); + if (ret < 0) { + PERROR("bind"); + ret = -errno; + goto error_close; + } + + return fd; + +error_close: + { + int closeret; + + closeret = close(fd); + if (closeret) { + PERROR("close"); + } + } +error: + return ret; +} + +/* + * ustcomm_listen_unix_sock + * + * Make the socket listen using LTTNG_UST_COMM_MAX_LISTEN. + */ +int ustcomm_listen_unix_sock(int sock) +{ + int ret; + + ret = listen(sock, LTTNG_UST_COMM_MAX_LISTEN); + if (ret < 0) { + ret = -errno; + PERROR("listen"); + } + + return ret; +} + +/* + * ustcomm_close_unix_sock + * + * Shutdown cleanly a unix socket. + * + * Handles fd tracker internally. + */ +int ustcomm_close_unix_sock(int sock) +{ + int ret; + + lttng_ust_lock_fd_tracker(); + ret = close(sock); + if (!ret) { + lttng_ust_delete_fd_from_tracker(sock); + } else { + PERROR("close"); + ret = -errno; + } + lttng_ust_unlock_fd_tracker(); + + return ret; +} + +/* + * ustcomm_recv_unix_sock + * + * Receive data of size len in put that data into + * the buf param. Using recvmsg API. + * Return the size of received data. + * Return 0 on orderly shutdown. + */ +ssize_t ustcomm_recv_unix_sock(int sock, void *buf, size_t len) +{ + struct msghdr msg; + struct iovec iov[1]; + ssize_t ret = -1; + size_t len_last; + + memset(&msg, 0, sizeof(msg)); + + iov[0].iov_base = buf; + iov[0].iov_len = len; + msg.msg_iov = iov; + msg.msg_iovlen = 1; + + do { + len_last = iov[0].iov_len; + ret = recvmsg(sock, &msg, 0); + if (ret > 0) { + iov[0].iov_base += ret; + iov[0].iov_len -= ret; + assert(ret <= len_last); + } + } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR)); + + if (ret < 0) { + int shutret; + + if (errno != EPIPE && errno != ECONNRESET && errno != ECONNREFUSED) + PERROR("recvmsg"); + ret = -errno; + if (ret == -ECONNRESET || ret == -ECONNREFUSED) + ret = -EPIPE; + + shutret = shutdown(sock, SHUT_RDWR); + if (shutret) + ERR("Socket shutdown error"); + } else if (ret > 0) { + ret = len; + } + /* ret = 0 means an orderly shutdown. */ + + return ret; +} + +/* + * ustcomm_send_unix_sock + * + * Send buf data of size len. Using sendmsg API. + * Return the size of sent data. + */ +ssize_t ustcomm_send_unix_sock(int sock, const void *buf, size_t len) +{ + struct msghdr msg; + struct iovec iov[1]; + ssize_t ret; + + memset(&msg, 0, sizeof(msg)); + + iov[0].iov_base = (void *) buf; + iov[0].iov_len = len; + msg.msg_iov = iov; + msg.msg_iovlen = 1; + + /* + * Using the MSG_NOSIGNAL when sending data from sessiond to + * libust, so libust does not receive an unhandled SIGPIPE or + * SIGURG. The sessiond receiver side can be made more resilient + * by ignoring SIGPIPE, but we don't have this luxury on the + * libust side. + */ + do { + ret = sendmsg(sock, &msg, MSG_NOSIGNAL); + } while (ret < 0 && errno == EINTR); + + if (ret < 0) { + int shutret; + + if (errno != EPIPE && errno != ECONNRESET) + PERROR("sendmsg"); + ret = -errno; + if (ret == -ECONNRESET) + ret = -EPIPE; + + shutret = shutdown(sock, SHUT_RDWR); + if (shutret) + ERR("Socket shutdown error"); + } + + return ret; +} + +/* + * Send a message accompanied by fd(s) over a unix socket. + * + * Returns the size of data sent, or negative error value. + */ +ssize_t ustcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd) +{ + struct msghdr msg; + struct cmsghdr *cmptr; + struct iovec iov[1]; + ssize_t ret = -1; + unsigned int sizeof_fds = nb_fd * sizeof(int); + char tmp[CMSG_SPACE(sizeof_fds)]; + char dummy = 0; + + memset(&msg, 0, sizeof(msg)); + memset(tmp, 0, CMSG_SPACE(sizeof_fds) * sizeof(char)); + + if (nb_fd > USTCOMM_MAX_SEND_FDS) + return -EINVAL; + + msg.msg_control = (caddr_t)tmp; + msg.msg_controllen = CMSG_LEN(sizeof_fds); + + cmptr = CMSG_FIRSTHDR(&msg); + if (!cmptr) + return -EINVAL; + cmptr->cmsg_level = SOL_SOCKET; + cmptr->cmsg_type = SCM_RIGHTS; + cmptr->cmsg_len = CMSG_LEN(sizeof_fds); + memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); + /* Sum of the length of all control messages in the buffer: */ + msg.msg_controllen = cmptr->cmsg_len; + + iov[0].iov_base = &dummy; + iov[0].iov_len = 1; + msg.msg_iov = iov; + msg.msg_iovlen = 1; + + do { + ret = sendmsg(sock, &msg, MSG_NOSIGNAL); + } while (ret < 0 && errno == EINTR); + if (ret < 0) { + /* + * We consider EPIPE and ECONNRESET as expected. + */ + if (errno != EPIPE && errno != ECONNRESET) { + PERROR("sendmsg"); + } + ret = -errno; + if (ret == -ECONNRESET) + ret = -EPIPE; + } + return ret; +} + +/* + * Recv a message accompanied by fd(s) from a unix socket. + * + * Expect at most "nb_fd" file descriptors. Returns the number of fd + * actually received in nb_fd. + * Returns -EPIPE on orderly shutdown. + */ +ssize_t ustcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd) +{ + struct iovec iov[1]; + ssize_t ret = 0; + struct cmsghdr *cmsg; + size_t sizeof_fds = nb_fd * sizeof(int); + char recv_fd[CMSG_SPACE(sizeof_fds)]; + struct msghdr msg; + char dummy; + int i; + + memset(&msg, 0, sizeof(msg)); + + /* Prepare to receive the structures */ + iov[0].iov_base = &dummy; + iov[0].iov_len = 1; + msg.msg_iov = iov; + msg.msg_iovlen = 1; + msg.msg_control = recv_fd; + msg.msg_controllen = sizeof(recv_fd); + + do { + ret = recvmsg(sock, &msg, 0); + } while (ret < 0 && errno == EINTR); + if (ret < 0) { + if (errno != EPIPE && errno != ECONNRESET) { + PERROR("recvmsg fds"); + } + ret = -errno; + if (ret == -ECONNRESET) + ret = -EPIPE; + goto end; + } + if (ret == 0) { + /* orderly shutdown */ + ret = -EPIPE; + goto end; + } + if (ret != 1) { + ERR("Error: Received %zd bytes, expected %d\n", + ret, 1); + goto end; + } + if (msg.msg_flags & MSG_CTRUNC) { + ERR("Error: Control message truncated.\n"); + ret = -1; + goto end; + } + cmsg = CMSG_FIRSTHDR(&msg); + if (!cmsg) { + ERR("Error: Invalid control message header\n"); + ret = -1; + goto end; + } + if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) { + ERR("Didn't received any fd\n"); + ret = -1; + goto end; + } + if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) { + ERR("Error: Received %zu bytes of ancillary data, expected %zu\n", + (size_t) cmsg->cmsg_len, (size_t) CMSG_LEN(sizeof_fds)); + ret = -1; + goto end; + } + + memcpy(fds, CMSG_DATA(cmsg), sizeof_fds); + + /* Set FD_CLOEXEC */ + for (i = 0; i < nb_fd; i++) { + ret = fcntl(fds[i], F_SETFD, FD_CLOEXEC); + if (ret < 0) { + PERROR("fcntl failed to set FD_CLOEXEC on fd %d", + fds[i]); + } + } + + ret = nb_fd; +end: + return ret; +} + +int ustcomm_send_app_msg(int sock, struct ustcomm_ust_msg *lum) +{ + ssize_t len; + + len = ustcomm_send_unix_sock(sock, lum, sizeof(*lum)); + switch (len) { + case sizeof(*lum): + break; + default: + if (len < 0) { + return len; + } else { + ERR("incorrect message size: %zd\n", len); + return -EINVAL; + } + } + return 0; +} + +int ustcomm_recv_app_reply(int sock, struct ustcomm_ust_reply *lur, + uint32_t expected_handle, uint32_t expected_cmd) +{ + ssize_t len; + + memset(lur, 0, sizeof(*lur)); + len = ustcomm_recv_unix_sock(sock, lur, sizeof(*lur)); + switch (len) { + case 0: /* orderly shutdown */ + return -EPIPE; + case sizeof(*lur): + { + int err = 0; + + if (lur->handle != expected_handle) { + ERR("Unexpected result message handle: " + "expected: %u vs received: %u\n", + expected_handle, lur->handle); + err = 1; + } + if (lur->cmd != expected_cmd) { + ERR("Unexpected result message command " + "expected: %u vs received: %u\n", + expected_cmd, lur->cmd); + err = 1; + } + if (err) { + return -EINVAL; + } else { + return lur->ret_code; + } + } + default: + if (len >= 0) { + ERR("incorrect message size: %zd\n", len); + } + return len; + } +} + +int ustcomm_send_app_cmd(int sock, + struct ustcomm_ust_msg *lum, + struct ustcomm_ust_reply *lur) +{ + int ret; + + ret = ustcomm_send_app_msg(sock, lum); + if (ret) + return ret; + ret = ustcomm_recv_app_reply(sock, lur, lum->handle, lum->cmd); + if (ret > 0) + return -EIO; + return ret; +} + +/* + * chan_data is allocated internally if this function returns the + * expected var_len. + */ +ssize_t ustcomm_recv_channel_from_sessiond(int sock, + void **_chan_data, uint64_t var_len, + int *_wakeup_fd) +{ + void *chan_data; + ssize_t len, nr_fd; + int wakeup_fd, ret; + + if (var_len > LTTNG_UST_ABI_CHANNEL_DATA_MAX_LEN) { + len = -EINVAL; + goto error_check; + } + /* Receive variable length data */ + chan_data = zmalloc(var_len); + if (!chan_data) { + len = -ENOMEM; + goto error_alloc; + } + len = ustcomm_recv_unix_sock(sock, chan_data, var_len); + if (len != var_len) { + goto error_recv; + } + /* recv wakeup fd */ + lttng_ust_lock_fd_tracker(); + nr_fd = ustcomm_recv_fds_unix_sock(sock, &wakeup_fd, 1); + if (nr_fd <= 0) { + lttng_ust_unlock_fd_tracker(); + if (nr_fd < 0) { + len = nr_fd; + goto error_recv; + } else { + len = -EIO; + goto error_recv; + } + } + + ret = lttng_ust_add_fd_to_tracker(wakeup_fd); + if (ret < 0) { + ret = close(wakeup_fd); + if (ret) { + PERROR("close on wakeup_fd"); + } + len = -EIO; + lttng_ust_unlock_fd_tracker(); + goto error_recv; + } + + *_wakeup_fd = ret; + lttng_ust_unlock_fd_tracker(); + + *_chan_data = chan_data; + return len; + +error_recv: + free(chan_data); +error_alloc: +error_check: + return len; +} + +ssize_t ustcomm_recv_event_notifier_notif_fd_from_sessiond(int sock, + int *_event_notifier_notif_fd) +{ + ssize_t nr_fd; + int event_notifier_notif_fd, ret; + + /* Receive event_notifier notification fd */ + lttng_ust_lock_fd_tracker(); + nr_fd = ustcomm_recv_fds_unix_sock(sock, &event_notifier_notif_fd, 1); + if (nr_fd <= 0) { + lttng_ust_unlock_fd_tracker(); + if (nr_fd < 0) { + ret = nr_fd; + goto error; + } else { + ret = -EIO; + goto error; + } + } + + ret = lttng_ust_add_fd_to_tracker(event_notifier_notif_fd); + if (ret < 0) { + ret = close(event_notifier_notif_fd); + if (ret) { + PERROR("close on event_notifier notif fd"); + } + ret = -EIO; + lttng_ust_unlock_fd_tracker(); + goto error; + } + + *_event_notifier_notif_fd = ret; + lttng_ust_unlock_fd_tracker(); + + ret = nr_fd; + +error: + return ret; +} + +int ustcomm_recv_stream_from_sessiond(int sock, + uint64_t *memory_map_size __attribute__((unused)), + int *shm_fd, int *wakeup_fd) +{ + ssize_t len; + int ret; + int fds[2]; + + /* recv shm fd and wakeup fd */ + lttng_ust_lock_fd_tracker(); + len = ustcomm_recv_fds_unix_sock(sock, fds, 2); + if (len <= 0) { + lttng_ust_unlock_fd_tracker(); + if (len < 0) { + ret = len; + goto error; + } else { + ret = -EIO; + goto error; + } + } + + ret = lttng_ust_add_fd_to_tracker(fds[0]); + if (ret < 0) { + ret = close(fds[0]); + if (ret) { + PERROR("close on received shm_fd"); + } + ret = -EIO; + lttng_ust_unlock_fd_tracker(); + goto error; + } + *shm_fd = ret; + + ret = lttng_ust_add_fd_to_tracker(fds[1]); + if (ret < 0) { + ret = close(*shm_fd); + if (ret) { + PERROR("close on shm_fd"); + } + *shm_fd = -1; + ret = close(fds[1]); + if (ret) { + PERROR("close on received wakeup_fd"); + } + ret = -EIO; + lttng_ust_unlock_fd_tracker(); + goto error; + } + *wakeup_fd = ret; + lttng_ust_unlock_fd_tracker(); + return 0; + +error: + return ret; +} + +ssize_t ustcomm_recv_counter_from_sessiond(int sock, + void **_counter_data, uint64_t var_len) +{ + void *counter_data; + ssize_t len; + + if (var_len > LTTNG_UST_ABI_COUNTER_DATA_MAX_LEN) { + len = -EINVAL; + goto error_check; + } + /* Receive variable length data */ + counter_data = zmalloc(var_len); + if (!counter_data) { + len = -ENOMEM; + goto error_alloc; + } + len = ustcomm_recv_unix_sock(sock, counter_data, var_len); + if (len != var_len) { + goto error_recv; + } + *_counter_data = counter_data; + return len; + +error_recv: + free(counter_data); +error_alloc: +error_check: + return len; +} + +int ustcomm_recv_counter_shm_from_sessiond(int sock, + int *shm_fd) +{ + ssize_t len; + int ret; + int fds[1]; + + /* recv shm fd fd */ + lttng_ust_lock_fd_tracker(); + len = ustcomm_recv_fds_unix_sock(sock, fds, 1); + if (len <= 0) { + lttng_ust_unlock_fd_tracker(); + if (len < 0) { + ret = len; + goto error; + } else { + ret = -EIO; + goto error; + } + } + + ret = lttng_ust_add_fd_to_tracker(fds[0]); + if (ret < 0) { + ret = close(fds[0]); + if (ret) { + PERROR("close on received shm_fd"); + } + ret = -EIO; + lttng_ust_unlock_fd_tracker(); + goto error; + } + *shm_fd = ret; + lttng_ust_unlock_fd_tracker(); + return 0; + +error: + return ret; +} + +/* + * Returns 0 on success, negative error value on error. + */ +int ustcomm_send_reg_msg(int sock, + enum ustctl_socket_type type, + uint32_t bits_per_long, + uint32_t uint8_t_alignment, + uint32_t uint16_t_alignment, + uint32_t uint32_t_alignment, + uint32_t uint64_t_alignment, + uint32_t long_alignment) +{ + ssize_t len; + struct ustctl_reg_msg reg_msg; + + reg_msg.magic = LTTNG_UST_ABI_COMM_MAGIC; + reg_msg.major = LTTNG_UST_ABI_MAJOR_VERSION; + reg_msg.minor = LTTNG_UST_ABI_MINOR_VERSION; + reg_msg.pid = getpid(); + reg_msg.ppid = getppid(); + reg_msg.uid = getuid(); + reg_msg.gid = getgid(); + reg_msg.bits_per_long = bits_per_long; + reg_msg.uint8_t_alignment = uint8_t_alignment; + reg_msg.uint16_t_alignment = uint16_t_alignment; + reg_msg.uint32_t_alignment = uint32_t_alignment; + reg_msg.uint64_t_alignment = uint64_t_alignment; + reg_msg.long_alignment = long_alignment; + reg_msg.socket_type = type; + lttng_pthread_getname_np(reg_msg.name, LTTNG_UST_ABI_PROCNAME_LEN); + memset(reg_msg.padding, 0, sizeof(reg_msg.padding)); + + len = ustcomm_send_unix_sock(sock, ®_msg, sizeof(reg_msg)); + if (len > 0 && len != sizeof(reg_msg)) + return -EIO; + if (len < 0) + return len; + return 0; +} + +static +ssize_t count_one_type(const struct lttng_ust_type_common *lt) +{ + switch (lt->type) { + case lttng_ust_type_integer: + case lttng_ust_type_float: + case lttng_ust_type_string: + return 1; + case lttng_ust_type_enum: + return count_one_type(lttng_ust_get_type_enum(lt)->container_type) + 1; + case lttng_ust_type_array: + return count_one_type(lttng_ust_get_type_array(lt)->elem_type) + 1; + case lttng_ust_type_sequence: + return count_one_type(lttng_ust_get_type_sequence(lt)->elem_type) + 1; + case lttng_ust_type_struct: + return count_fields_recursive(lttng_ust_get_type_struct(lt)->nr_fields, + lttng_ust_get_type_struct(lt)->fields) + 1; + + case lttng_ust_type_dynamic: + { + const struct lttng_ust_event_field **choices; + size_t nr_choices; + int ret; + + ret = lttng_ust_dynamic_type_choices(&nr_choices, + &choices); + if (ret) + return ret; + /* + * Two fields for enum, one field for variant, and + * one field per choice. + */ + return count_fields_recursive(nr_choices, choices) + 3; + } + + default: + return -EINVAL; + } + return 0; +} + +static +ssize_t count_fields_recursive(size_t nr_fields, + const struct lttng_ust_event_field **lttng_fields) +{ + int i; + ssize_t ret, count = 0; + + for (i = 0; i < nr_fields; i++) { + const struct lttng_ust_event_field *lf; + + lf = lttng_fields[i]; + /* skip 'nowrite' fields */ + if (lf->nowrite) + continue; + ret = count_one_type(lf->type); + if (ret < 0) + return ret; /* error */ + count += ret; + } + return count; +} + +static +ssize_t count_ctx_fields_recursive(size_t nr_fields, + struct lttng_ust_ctx_field *lttng_fields) +{ + int i; + ssize_t ret, count = 0; + + for (i = 0; i < nr_fields; i++) { + const struct lttng_ust_event_field *lf; + + lf = lttng_fields[i].event_field; + /* skip 'nowrite' fields */ + if (lf->nowrite) + continue; + ret = count_one_type(lf->type); + if (ret < 0) + return ret; /* error */ + count += ret; + } + return count; +} + +static +int serialize_string_encoding(int32_t *ue, + enum lttng_ust_string_encoding le) +{ + switch (le) { + case lttng_ust_string_encoding_none: + *ue = ustctl_encode_none; + break; + case lttng_ust_string_encoding_UTF8: + *ue = ustctl_encode_UTF8; + break; + case lttng_ust_string_encoding_ASCII: + *ue = ustctl_encode_ASCII; + break; + default: + return -EINVAL; + } + return 0; +} + +static +int serialize_integer_type(struct ustctl_integer_type *uit, + const struct lttng_ust_type_integer *lit, + enum lttng_ust_string_encoding lencoding) +{ + int32_t encoding; + + uit->size = lit->size; + uit->signedness = lit->signedness; + uit->reverse_byte_order = lit->reverse_byte_order; + uit->base = lit->base; + if (serialize_string_encoding(&encoding, lencoding)) + return -EINVAL; + uit->encoding = encoding; + uit->alignment = lit->alignment; + return 0; +} + +static +int serialize_dynamic_type(struct lttng_ust_session *session, + struct ustctl_field *fields, size_t *iter_output, + const char *field_name) +{ + const struct lttng_ust_event_field **choices; + char tag_field_name[LTTNG_UST_ABI_SYM_NAME_LEN]; + const struct lttng_ust_type_common *tag_type; + const struct lttng_ust_event_field *tag_field_generic; + struct lttng_ust_event_field tag_field = { + .name = tag_field_name, + .nowrite = 0, + }; + struct ustctl_field *uf; + size_t nr_choices, i; + int ret; + + tag_field_generic = lttng_ust_dynamic_type_tag_field(); + tag_type = tag_field_generic->type; + + /* Serialize enum field. */ + strncpy(tag_field_name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); + tag_field_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + strncat(tag_field_name, + "_tag", + LTTNG_UST_ABI_SYM_NAME_LEN - strlen(tag_field_name) - 1); + tag_field.type = tag_type; + ret = serialize_one_field(session, fields, iter_output, + &tag_field); + if (ret) + return ret; + + /* Serialize variant field. */ + uf = &fields[*iter_output]; + ret = lttng_ust_dynamic_type_choices(&nr_choices, &choices); + if (ret) + return ret; + + strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); + uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + uf->type.atype = ustctl_atype_variant; + uf->type.u.variant_nestable.nr_choices = nr_choices; + strncpy(uf->type.u.variant_nestable.tag_name, + tag_field_name, + LTTNG_UST_ABI_SYM_NAME_LEN); + uf->type.u.variant_nestable.tag_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + uf->type.u.variant_nestable.alignment = 0; + (*iter_output)++; + + /* Serialize choice fields after variant. */ + for (i = 0; i < nr_choices; i++) { + ret = serialize_one_field(session, fields, + iter_output, choices[i]); + if (ret) + return ret; + } + return 0; +} + +static +int serialize_one_type(struct lttng_ust_session *session, + struct ustctl_field *fields, size_t *iter_output, + const char *field_name, const struct lttng_ust_type_common *lt, + enum lttng_ust_string_encoding parent_encoding) +{ + int ret; + + /* + * Serializing a type (rather than a field) generates a ustctl_field + * entry with 0-length name. + */ + + switch (lt->type) { + case lttng_ust_type_integer: + { + struct ustctl_field *uf = &fields[*iter_output]; + struct ustctl_type *ut = &uf->type; + + if (field_name) { + strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); + uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + } else { + uf->name[0] = '\0'; + } + ret = serialize_integer_type(&ut->u.integer, lttng_ust_get_type_integer(lt), + parent_encoding); + if (ret) + return ret; + ut->atype = ustctl_atype_integer; + (*iter_output)++; + break; + } + case lttng_ust_type_float: + { + struct ustctl_field *uf = &fields[*iter_output]; + struct ustctl_type *ut = &uf->type; + struct ustctl_float_type *uft; + const struct lttng_ust_type_float *lft; + + if (field_name) { + strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); + uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + } else { + uf->name[0] = '\0'; + } + uft = &ut->u._float; + lft = lttng_ust_get_type_float(lt); + uft->exp_dig = lft->exp_dig; + uft->mant_dig = lft->mant_dig; + uft->alignment = lft->alignment; + uft->reverse_byte_order = lft->reverse_byte_order; + ut->atype = ustctl_atype_float; + (*iter_output)++; + break; + } + case lttng_ust_type_string: + { + struct ustctl_field *uf = &fields[*iter_output]; + struct ustctl_type *ut = &uf->type; + int32_t encoding; + + if (field_name) { + strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); + uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + } else { + uf->name[0] = '\0'; + } + ret = serialize_string_encoding(&encoding, lttng_ust_get_type_string(lt)->encoding); + if (ret) + return ret; + ut->u.string.encoding = encoding; + ut->atype = ustctl_atype_string; + (*iter_output)++; + break; + } + case lttng_ust_type_array: + { + struct ustctl_field *uf = &fields[*iter_output]; + struct ustctl_type *ut = &uf->type; + + if (field_name) { + strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); + uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + } else { + uf->name[0] = '\0'; + } + ut->atype = ustctl_atype_array_nestable; + ut->u.array_nestable.length = lttng_ust_get_type_array(lt)->length; + ut->u.array_nestable.alignment = lttng_ust_get_type_array(lt)->alignment; + (*iter_output)++; + + ret = serialize_one_type(session, fields, iter_output, NULL, + lttng_ust_get_type_array(lt)->elem_type, + lttng_ust_get_type_array(lt)->encoding); + if (ret) + return -EINVAL; + break; + } + case lttng_ust_type_sequence: + { + struct ustctl_field *uf = &fields[*iter_output]; + struct ustctl_type *ut = &uf->type; + + if (field_name) { + strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); + uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + } else { + uf->name[0] = '\0'; + } + ut->atype = ustctl_atype_sequence_nestable; + strncpy(ut->u.sequence_nestable.length_name, + lttng_ust_get_type_sequence(lt)->length_name, + LTTNG_UST_ABI_SYM_NAME_LEN); + ut->u.sequence_nestable.length_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + ut->u.sequence_nestable.alignment = lttng_ust_get_type_sequence(lt)->alignment; + (*iter_output)++; + + ret = serialize_one_type(session, fields, iter_output, NULL, + lttng_ust_get_type_sequence(lt)->elem_type, + lttng_ust_get_type_sequence(lt)->encoding); + if (ret) + return -EINVAL; + break; + } + case lttng_ust_type_dynamic: + { + ret = serialize_dynamic_type(session, fields, iter_output, + field_name); + if (ret) + return -EINVAL; + break; + } + case lttng_ust_type_struct: + { + struct ustctl_field *uf = &fields[*iter_output]; + + if (field_name) { + strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); + uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + } else { + uf->name[0] = '\0'; + } + uf->type.atype = ustctl_atype_struct_nestable; + uf->type.u.struct_nestable.nr_fields = lttng_ust_get_type_struct(lt)->nr_fields; + uf->type.u.struct_nestable.alignment = lttng_ust_get_type_struct(lt)->alignment; + (*iter_output)++; + + ret = serialize_fields(session, fields, iter_output, + lttng_ust_get_type_struct(lt)->nr_fields, + lttng_ust_get_type_struct(lt)->fields); + if (ret) + return -EINVAL; + break; + } + case lttng_ust_type_enum: + { + struct ustctl_field *uf = &fields[*iter_output]; + struct ustctl_type *ut = &uf->type; + + if (field_name) { + strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); + uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + } else { + uf->name[0] = '\0'; + } + strncpy(ut->u.enum_nestable.name, lttng_ust_get_type_enum(lt)->desc->name, + LTTNG_UST_ABI_SYM_NAME_LEN); + ut->u.enum_nestable.name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + ut->atype = ustctl_atype_enum_nestable; + (*iter_output)++; + + ret = serialize_one_type(session, fields, iter_output, NULL, + lttng_ust_get_type_enum(lt)->container_type, + lttng_ust_string_encoding_none); + if (ret) + return -EINVAL; + if (session) { + const struct lttng_enum *_enum; + + _enum = lttng_ust_enum_get_from_desc(session, lttng_ust_get_type_enum(lt)->desc); + if (!_enum) + return -EINVAL; + ut->u.enum_nestable.id = _enum->id; + } else { + ut->u.enum_nestable.id = -1ULL; + } + break; + } + default: + return -EINVAL; + } + return 0; +} + +static +int serialize_one_field(struct lttng_ust_session *session, + struct ustctl_field *fields, size_t *iter_output, + const struct lttng_ust_event_field *lf) +{ + /* skip 'nowrite' fields */ + if (lf->nowrite) + return 0; + + return serialize_one_type(session, fields, iter_output, lf->name, lf->type, lttng_ust_string_encoding_none); +} + +static +int serialize_fields(struct lttng_ust_session *session, + struct ustctl_field *ustctl_fields, + size_t *iter_output, size_t nr_lttng_fields, + const struct lttng_ust_event_field **lttng_fields) +{ + int ret; + size_t i; + + for (i = 0; i < nr_lttng_fields; i++) { + ret = serialize_one_field(session, ustctl_fields, + iter_output, lttng_fields[i]); + if (ret) + return ret; + } + return 0; +} + +static +int alloc_serialize_fields(struct lttng_ust_session *session, + size_t *_nr_write_fields, + struct ustctl_field **ustctl_fields, + size_t nr_fields, + const struct lttng_ust_event_field **lttng_fields) +{ + struct ustctl_field *fields; + int ret; + size_t iter_output = 0; + ssize_t nr_write_fields; + + nr_write_fields = count_fields_recursive(nr_fields, lttng_fields); + if (nr_write_fields < 0) { + return (int) nr_write_fields; + } + + fields = zmalloc(nr_write_fields * sizeof(*fields)); + if (!fields) + return -ENOMEM; + + ret = serialize_fields(session, fields, &iter_output, nr_fields, + lttng_fields); + if (ret) + goto error_type; + + *_nr_write_fields = nr_write_fields; + *ustctl_fields = fields; + return 0; + +error_type: + free(fields); + return ret; +} + +static +int serialize_entries(struct ustctl_enum_entry **_entries, + size_t nr_entries, + const struct lttng_ust_enum_entry **lttng_entries) +{ + struct ustctl_enum_entry *entries; + int i; + + /* Serialize the entries */ + entries = zmalloc(nr_entries * sizeof(*entries)); + if (!entries) + return -ENOMEM; + for (i = 0; i < nr_entries; i++) { + struct ustctl_enum_entry *uentry; + const struct lttng_ust_enum_entry *lentry; + + uentry = &entries[i]; + lentry = lttng_entries[i]; + + uentry->start.value = lentry->start.value; + uentry->start.signedness = lentry->start.signedness; + uentry->end.value = lentry->end.value; + uentry->end.signedness = lentry->end.signedness; + strncpy(uentry->string, lentry->string, LTTNG_UST_ABI_SYM_NAME_LEN); + uentry->string[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + + if (lentry->options & LTTNG_UST_ENUM_ENTRY_OPTION_IS_AUTO) { + uentry->u.extra.options |= + USTCTL_UST_ENUM_ENTRY_OPTION_IS_AUTO; + } + } + *_entries = entries; + return 0; +} + +static +int serialize_ctx_fields(struct lttng_ust_session *session, + size_t *_nr_write_fields, + struct ustctl_field **ustctl_fields, + size_t nr_fields, + struct lttng_ust_ctx_field *lttng_fields) +{ + struct ustctl_field *fields; + int ret; + size_t i, iter_output = 0; + ssize_t nr_write_fields; + + nr_write_fields = count_ctx_fields_recursive(nr_fields, + lttng_fields); + if (nr_write_fields < 0) { + return (int) nr_write_fields; + } + + fields = zmalloc(nr_write_fields * sizeof(*fields)); + if (!fields) + return -ENOMEM; + + for (i = 0; i < nr_fields; i++) { + ret = serialize_one_field(session, fields, &iter_output, + lttng_fields[i].event_field); + if (ret) + goto error_type; + } + + *_nr_write_fields = nr_write_fields; + *ustctl_fields = fields; + return 0; + +error_type: + free(fields); + return ret; +} + +/* + * Returns 0 on success, negative error value on error. + */ +int ustcomm_register_event(int sock, + struct lttng_ust_session *session, + int session_objd, /* session descriptor */ + int channel_objd, /* channel descriptor */ + const char *event_name, /* event name (input) */ + int loglevel, + const char *signature, /* event signature (input) */ + size_t nr_fields, /* fields */ + const struct lttng_ust_event_field **lttng_fields, + const char *model_emf_uri, + uint32_t *id) /* event id (output) */ +{ + ssize_t len; + struct { + struct ustcomm_notify_hdr header; + struct ustcomm_notify_event_msg m; + } msg; + struct { + struct ustcomm_notify_hdr header; + struct ustcomm_notify_event_reply r; + } reply; + size_t signature_len, fields_len, model_emf_uri_len; + struct ustctl_field *fields = NULL; + size_t nr_write_fields = 0; + int ret; + + memset(&msg, 0, sizeof(msg)); + msg.header.notify_cmd = USTCTL_NOTIFY_CMD_EVENT; + msg.m.session_objd = session_objd; + msg.m.channel_objd = channel_objd; + strncpy(msg.m.event_name, event_name, LTTNG_UST_ABI_SYM_NAME_LEN); + msg.m.event_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + msg.m.loglevel = loglevel; + signature_len = strlen(signature) + 1; + msg.m.signature_len = signature_len; + + /* Calculate fields len, serialize fields. */ + if (nr_fields > 0) { + ret = alloc_serialize_fields(session, &nr_write_fields, &fields, + nr_fields, lttng_fields); + if (ret) + return ret; + } + + fields_len = sizeof(*fields) * nr_write_fields; + msg.m.fields_len = fields_len; + if (model_emf_uri) { + model_emf_uri_len = strlen(model_emf_uri) + 1; + } else { + model_emf_uri_len = 0; + } + msg.m.model_emf_uri_len = model_emf_uri_len; + + len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg)); + if (len > 0 && len != sizeof(msg)) { + ret = -EIO; + goto error_fields; + } + if (len < 0) { + ret = len; + goto error_fields; + } + + /* send signature */ + len = ustcomm_send_unix_sock(sock, signature, signature_len); + if (len > 0 && len != signature_len) { + ret = -EIO; + goto error_fields; + } + if (len < 0) { + ret = len; + goto error_fields; + } + + /* send fields */ + if (fields_len > 0) { + len = ustcomm_send_unix_sock(sock, fields, fields_len); + if (len > 0 && len != fields_len) { + ret = -EIO; + goto error_fields; + } + if (len < 0) { + ret = len; + goto error_fields; + } + } + free(fields); + + if (model_emf_uri_len) { + /* send model_emf_uri */ + len = ustcomm_send_unix_sock(sock, model_emf_uri, + model_emf_uri_len); + if (len > 0 && len != model_emf_uri_len) { + return -EIO; + } + if (len < 0) { + return len; + } + } + + /* receive reply */ + len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply)); + switch (len) { + case 0: /* orderly shutdown */ + return -EPIPE; + case sizeof(reply): + if (reply.header.notify_cmd != msg.header.notify_cmd) { + ERR("Unexpected result message command " + "expected: %u vs received: %u\n", + msg.header.notify_cmd, reply.header.notify_cmd); + return -EINVAL; + } + if (reply.r.ret_code > 0) + return -EINVAL; + if (reply.r.ret_code < 0) + return reply.r.ret_code; + *id = reply.r.event_id; + DBG("Sent register event notification for name \"%s\": ret_code %d, event_id %u\n", + event_name, reply.r.ret_code, reply.r.event_id); + return 0; + default: + if (len < 0) { + /* Transport level error */ + if (errno == EPIPE || errno == ECONNRESET) + len = -errno; + return len; + } else { + ERR("incorrect message size: %zd\n", len); + return len; + } + } + /* Unreached. */ + + /* Error path only. */ +error_fields: + free(fields); + return ret; +} + +/* + * Returns 0 on success, negative error value on error. + * Returns -EPIPE or -ECONNRESET if other end has hung up. + */ +int ustcomm_register_enum(int sock, + int session_objd, /* session descriptor */ + const char *enum_name, /* enum name (input) */ + size_t nr_entries, /* entries */ + const struct lttng_ust_enum_entry **lttng_entries, + uint64_t *id) +{ + ssize_t len; + struct { + struct ustcomm_notify_hdr header; + struct ustcomm_notify_enum_msg m; + } msg; + struct { + struct ustcomm_notify_hdr header; + struct ustcomm_notify_enum_reply r; + } reply; + size_t entries_len; + struct ustctl_enum_entry *entries = NULL; + int ret; + + memset(&msg, 0, sizeof(msg)); + msg.header.notify_cmd = USTCTL_NOTIFY_CMD_ENUM; + msg.m.session_objd = session_objd; + strncpy(msg.m.enum_name, enum_name, LTTNG_UST_ABI_SYM_NAME_LEN); + msg.m.enum_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; + + /* Calculate entries len, serialize entries. */ + if (nr_entries > 0) { + ret = serialize_entries(&entries, + nr_entries, lttng_entries); + if (ret) + return ret; + } + + entries_len = sizeof(*entries) * nr_entries; + msg.m.entries_len = entries_len; + + len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg)); + if (len > 0 && len != sizeof(msg)) { + ret = -EIO; + goto error_entries; + } + if (len < 0) { + ret = len; + goto error_entries; + } + + /* send entries */ + if (entries_len > 0) { + len = ustcomm_send_unix_sock(sock, entries, entries_len); + if (len > 0 && len != entries_len) { + ret = -EIO; + goto error_entries; + } + if (len < 0) { + ret = len; + goto error_entries; + } + } + free(entries); + entries = NULL; + + /* receive reply */ + len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply)); + switch (len) { + case 0: /* orderly shutdown */ + return -EPIPE; + case sizeof(reply): + if (reply.header.notify_cmd != msg.header.notify_cmd) { + ERR("Unexpected result message command " + "expected: %u vs received: %u\n", + msg.header.notify_cmd, reply.header.notify_cmd); + return -EINVAL; + } + if (reply.r.ret_code > 0) + return -EINVAL; + if (reply.r.ret_code < 0) + return reply.r.ret_code; + *id = reply.r.enum_id; + DBG("Sent register enum notification for name \"%s\": ret_code %d\n", + enum_name, reply.r.ret_code); + return 0; + default: + if (len < 0) { + /* Transport level error */ + if (errno == EPIPE || errno == ECONNRESET) + len = -errno; + return len; + } else { + ERR("incorrect message size: %zd\n", len); + return len; + } + } + return ret; + +error_entries: + free(entries); + return ret; +} + +/* + * Returns 0 on success, negative error value on error. + * Returns -EPIPE or -ECONNRESET if other end has hung up. + */ +int ustcomm_register_channel(int sock, + struct lttng_ust_session *session, + int session_objd, /* session descriptor */ + int channel_objd, /* channel descriptor */ + size_t nr_ctx_fields, + struct lttng_ust_ctx_field *ctx_fields, + uint32_t *chan_id, /* channel id (output) */ + int *header_type) /* header type (output) */ +{ + ssize_t len; + struct { + struct ustcomm_notify_hdr header; + struct ustcomm_notify_channel_msg m; + } msg; + struct { + struct ustcomm_notify_hdr header; + struct ustcomm_notify_channel_reply r; + } reply; + size_t fields_len; + struct ustctl_field *fields = NULL; + int ret; + size_t nr_write_fields = 0; + + memset(&msg, 0, sizeof(msg)); + msg.header.notify_cmd = USTCTL_NOTIFY_CMD_CHANNEL; + msg.m.session_objd = session_objd; + msg.m.channel_objd = channel_objd; + + /* Calculate fields len, serialize fields. */ + if (nr_ctx_fields > 0) { + ret = serialize_ctx_fields(session, &nr_write_fields, &fields, + nr_ctx_fields, ctx_fields); + if (ret) + return ret; + } + + fields_len = sizeof(*fields) * nr_write_fields; + msg.m.ctx_fields_len = fields_len; + len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg)); + if (len > 0 && len != sizeof(msg)) { + free(fields); + return -EIO; + } + if (len < 0) { + free(fields); + return len; + } + + /* send fields */ + if (fields_len > 0) { + len = ustcomm_send_unix_sock(sock, fields, fields_len); + free(fields); + if (len > 0 && len != fields_len) { + return -EIO; + } + if (len < 0) { + return len; + } + } else { + free(fields); + } + + len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply)); + switch (len) { + case 0: /* orderly shutdown */ + return -EPIPE; + case sizeof(reply): + if (reply.header.notify_cmd != msg.header.notify_cmd) { + ERR("Unexpected result message command " + "expected: %u vs received: %u\n", + msg.header.notify_cmd, reply.header.notify_cmd); + return -EINVAL; + } + if (reply.r.ret_code > 0) + return -EINVAL; + if (reply.r.ret_code < 0) + return reply.r.ret_code; + *chan_id = reply.r.chan_id; + switch (reply.r.header_type) { + case 1: + case 2: + *header_type = reply.r.header_type; + break; + default: + ERR("Unexpected channel header type %u\n", + reply.r.header_type); + return -EINVAL; + } + DBG("Sent register channel notification: chan_id %d, header_type %d\n", + reply.r.chan_id, reply.r.header_type); + return 0; + default: + if (len < 0) { + /* Transport level error */ + if (errno == EPIPE || errno == ECONNRESET) + len = -errno; + return len; + } else { + ERR("incorrect message size: %zd\n", len); + return len; + } + } +} + +/* + * Set socket reciving timeout. + */ +int ustcomm_setsockopt_rcv_timeout(int sock, unsigned int msec) +{ + int ret; + struct timeval tv; + + tv.tv_sec = msec / 1000; + tv.tv_usec = (msec * 1000 % 1000000); + + ret = setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)); + if (ret < 0) { + PERROR("setsockopt SO_RCVTIMEO"); + ret = -errno; + } + + return ret; +} + +/* + * Set socket sending timeout. + */ +int ustcomm_setsockopt_snd_timeout(int sock, unsigned int msec) +{ + int ret; + struct timeval tv; + + tv.tv_sec = msec / 1000; + tv.tv_usec = (msec * 1000) % 1000000; + + ret = setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)); + if (ret < 0) { + PERROR("setsockopt SO_SNDTIMEO"); + ret = -errno; + } + + return ret; +} diff --git a/src/common/ustcomm.h b/src/common/ustcomm.h index 81ce885d..dac9aaed 100644 --- a/src/common/ustcomm.h +++ b/src/common/ustcomm.h @@ -11,8 +11,8 @@ * These declarations should NOT be considered stable API. */ -#ifndef _UST_COMMON_USTCOMM_H -#define _UST_COMMON_USTCOMM_H +#ifndef _UST_COMMON_UST_COMM_H +#define _UST_COMMON_UST_COMM_H #include #include @@ -324,4 +324,4 @@ int ustcomm_setsockopt_rcv_timeout(int sock, unsigned int msec) int ustcomm_setsockopt_snd_timeout(int sock, unsigned int msec) __attribute__((visibility("hidden"))); -#endif /* _UST_COMMON_USTCOMM_H */ +#endif /* _UST_COMMON_UST_COMM_H */ diff --git a/src/lib/lttng-ust-ctl/Makefile.am b/src/lib/lttng-ust-ctl/Makefile.am index 35999217..1d4eef33 100644 --- a/src/lib/lttng-ust-ctl/Makefile.am +++ b/src/lib/lttng-ust-ctl/Makefile.am @@ -11,7 +11,7 @@ liblttng_ust_ctl_la_LDFLAGS = \ liblttng_ust_ctl_la_LIBADD = \ $(top_builddir)/src/liblttng-ust/liblttng-ust-common.la \ - $(top_builddir)/src/liblttng-ust-comm/liblttng-ust-comm.la \ $(top_builddir)/src/liblttng-ust/liblttng-ust-support.la \ + $(top_builddir)/src/common/libustcomm.la \ $(top_builddir)/src/common/libcommon.la \ $(DL_LIBS) diff --git a/src/liblttng-ust-comm/Makefile.am b/src/liblttng-ust-comm/Makefile.am deleted file mode 100644 index cad9c4ef..00000000 --- a/src/liblttng-ust-comm/Makefile.am +++ /dev/null @@ -1,5 +0,0 @@ -# SPDX-License-Identifier: LGPL-2.1-only - -noinst_LTLIBRARIES = liblttng-ust-comm.la - -liblttng_ust_comm_la_SOURCES = lttng-ust-comm.c diff --git a/src/liblttng-ust-comm/lttng-ust-comm.c b/src/liblttng-ust-comm/lttng-ust-comm.c deleted file mode 100644 index 2d445cba..00000000 --- a/src/liblttng-ust-comm/lttng-ust-comm.c +++ /dev/null @@ -1,1773 +0,0 @@ -/* - * SPDX-License-Identifier: LGPL-2.1-only - * - * Copyright (C) 2011 David Goulet - * Copyright (C) 2011-2013 Mathieu Desnoyers - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include "common/ustcomm.h" -#include "common/ust-fd.h" -#include "common/macros.h" -#include -#include "common/dynamic-type.h" -#include "common/logging.h" - -#include "../liblttng-ust/ust-events-internal.h" -#include "../liblttng-ust/compat.h" - -#define USTCOMM_CODE_OFFSET(code) \ - (code == LTTNG_UST_OK ? 0 : (code - LTTNG_UST_ERR + 1)) - -#define USTCOMM_MAX_SEND_FDS 4 - -static -ssize_t count_fields_recursive(size_t nr_fields, - const struct lttng_ust_event_field **lttng_fields); -static -int serialize_one_field(struct lttng_ust_session *session, - struct ustctl_field *fields, size_t *iter_output, - const struct lttng_ust_event_field *lf); -static -int serialize_fields(struct lttng_ust_session *session, - struct ustctl_field *ustctl_fields, - size_t *iter_output, size_t nr_lttng_fields, - const struct lttng_ust_event_field **lttng_fields); - -/* - * Human readable error message. - */ -static const char *ustcomm_readable_code[] = { - [ USTCOMM_CODE_OFFSET(LTTNG_UST_OK) ] = "Success", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR) ] = "Unknown error", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_NOENT) ] = "No entry", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_EXIST) ] = "Object already exists", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL) ] = "Invalid argument", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_PERM) ] = "Permission denied", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_NOSYS) ] = "Not implemented", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_EXITING) ] = "Process is exiting", - - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL_MAGIC) ] = "Invalid magic number", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL_SOCKET_TYPE) ] = "Invalid socket type", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_UNSUP_MAJOR) ] = "Unsupported major version", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_PEERCRED) ] = "Cannot get unix socket peer credentials", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_PEERCRED_PID) ] = "Peer credentials PID is invalid. Socket appears to belong to a distinct, non-nested pid namespace.", -}; - -/* - * lttng_ust_strerror - * @code: must be a negative value of enum lttng_ust_error_code (or 0). - * - * Returns a ptr to a string representing a human readable error code from the - * ustcomm_return_code enum. - */ -const char *lttng_ust_strerror(int code) -{ - code = -code; - - if (code < LTTNG_UST_OK || code >= LTTNG_UST_ERR_NR) - code = LTTNG_UST_ERR; - - return ustcomm_readable_code[USTCOMM_CODE_OFFSET(code)]; -} - -/* - * ustcomm_connect_unix_sock - * - * Connect to unix socket using the path name. - * - * Caller handles FD tracker. - */ -int ustcomm_connect_unix_sock(const char *pathname, long timeout) -{ - struct sockaddr_un sun; - int fd, ret; - - /* - * libust threads require the close-on-exec flag for all - * resources so it does not leak file descriptors upon exec. - * SOCK_CLOEXEC is not used since it is linux specific. - */ - fd = socket(PF_UNIX, SOCK_STREAM, 0); - if (fd < 0) { - PERROR("socket"); - ret = -errno; - goto error; - } - if (timeout >= 0) { - /* Give at least 10ms. */ - if (timeout < 10) - timeout = 10; - ret = ustcomm_setsockopt_snd_timeout(fd, timeout); - if (ret < 0) { - WARN("Error setting connect socket send timeout"); - } - } - ret = fcntl(fd, F_SETFD, FD_CLOEXEC); - if (ret < 0) { - PERROR("fcntl"); - ret = -errno; - goto error_fcntl; - } - - memset(&sun, 0, sizeof(sun)); - sun.sun_family = AF_UNIX; - strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); - sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; - - ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun)); - if (ret < 0) { - /* - * Don't print message on connect ENOENT error, because - * connect is used in normal execution to detect if - * sessiond is alive. ENOENT is when the unix socket - * file does not exist, and ECONNREFUSED is when the - * file exists but no sessiond is listening. - */ - if (errno != ECONNREFUSED && errno != ECONNRESET - && errno != ENOENT && errno != EACCES) - PERROR("connect"); - ret = -errno; - if (ret == -ECONNREFUSED || ret == -ECONNRESET) - ret = -EPIPE; - goto error_connect; - } - - return fd; - -error_connect: -error_fcntl: - { - int closeret; - - closeret = close(fd); - if (closeret) - PERROR("close"); - } -error: - return ret; -} - -/* - * ustcomm_accept_unix_sock - * - * Do an accept(2) on the sock and return the - * new file descriptor. The socket MUST be bind(2) before. - */ -int ustcomm_accept_unix_sock(int sock) -{ - int new_fd; - struct sockaddr_un sun; - socklen_t len = 0; - - /* Blocking call */ - new_fd = accept(sock, (struct sockaddr *) &sun, &len); - if (new_fd < 0) { - if (errno != ECONNABORTED) - PERROR("accept"); - new_fd = -errno; - if (new_fd == -ECONNABORTED) - new_fd = -EPIPE; - } - return new_fd; -} - -/* - * ustcomm_create_unix_sock - * - * Creates a AF_UNIX local socket using pathname - * bind the socket upon creation and return the fd. - */ -int ustcomm_create_unix_sock(const char *pathname) -{ - struct sockaddr_un sun; - int fd, ret; - - /* Create server socket */ - if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { - PERROR("socket"); - ret = -errno; - goto error; - } - - memset(&sun, 0, sizeof(sun)); - sun.sun_family = AF_UNIX; - strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); - sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; - - /* Unlink the old file if present */ - (void) unlink(pathname); - ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); - if (ret < 0) { - PERROR("bind"); - ret = -errno; - goto error_close; - } - - return fd; - -error_close: - { - int closeret; - - closeret = close(fd); - if (closeret) { - PERROR("close"); - } - } -error: - return ret; -} - -/* - * ustcomm_listen_unix_sock - * - * Make the socket listen using LTTNG_UST_COMM_MAX_LISTEN. - */ -int ustcomm_listen_unix_sock(int sock) -{ - int ret; - - ret = listen(sock, LTTNG_UST_COMM_MAX_LISTEN); - if (ret < 0) { - ret = -errno; - PERROR("listen"); - } - - return ret; -} - -/* - * ustcomm_close_unix_sock - * - * Shutdown cleanly a unix socket. - * - * Handles fd tracker internally. - */ -int ustcomm_close_unix_sock(int sock) -{ - int ret; - - lttng_ust_lock_fd_tracker(); - ret = close(sock); - if (!ret) { - lttng_ust_delete_fd_from_tracker(sock); - } else { - PERROR("close"); - ret = -errno; - } - lttng_ust_unlock_fd_tracker(); - - return ret; -} - -/* - * ustcomm_recv_unix_sock - * - * Receive data of size len in put that data into - * the buf param. Using recvmsg API. - * Return the size of received data. - * Return 0 on orderly shutdown. - */ -ssize_t ustcomm_recv_unix_sock(int sock, void *buf, size_t len) -{ - struct msghdr msg; - struct iovec iov[1]; - ssize_t ret = -1; - size_t len_last; - - memset(&msg, 0, sizeof(msg)); - - iov[0].iov_base = buf; - iov[0].iov_len = len; - msg.msg_iov = iov; - msg.msg_iovlen = 1; - - do { - len_last = iov[0].iov_len; - ret = recvmsg(sock, &msg, 0); - if (ret > 0) { - iov[0].iov_base += ret; - iov[0].iov_len -= ret; - assert(ret <= len_last); - } - } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR)); - - if (ret < 0) { - int shutret; - - if (errno != EPIPE && errno != ECONNRESET && errno != ECONNREFUSED) - PERROR("recvmsg"); - ret = -errno; - if (ret == -ECONNRESET || ret == -ECONNREFUSED) - ret = -EPIPE; - - shutret = shutdown(sock, SHUT_RDWR); - if (shutret) - ERR("Socket shutdown error"); - } else if (ret > 0) { - ret = len; - } - /* ret = 0 means an orderly shutdown. */ - - return ret; -} - -/* - * ustcomm_send_unix_sock - * - * Send buf data of size len. Using sendmsg API. - * Return the size of sent data. - */ -ssize_t ustcomm_send_unix_sock(int sock, const void *buf, size_t len) -{ - struct msghdr msg; - struct iovec iov[1]; - ssize_t ret; - - memset(&msg, 0, sizeof(msg)); - - iov[0].iov_base = (void *) buf; - iov[0].iov_len = len; - msg.msg_iov = iov; - msg.msg_iovlen = 1; - - /* - * Using the MSG_NOSIGNAL when sending data from sessiond to - * libust, so libust does not receive an unhandled SIGPIPE or - * SIGURG. The sessiond receiver side can be made more resilient - * by ignoring SIGPIPE, but we don't have this luxury on the - * libust side. - */ - do { - ret = sendmsg(sock, &msg, MSG_NOSIGNAL); - } while (ret < 0 && errno == EINTR); - - if (ret < 0) { - int shutret; - - if (errno != EPIPE && errno != ECONNRESET) - PERROR("sendmsg"); - ret = -errno; - if (ret == -ECONNRESET) - ret = -EPIPE; - - shutret = shutdown(sock, SHUT_RDWR); - if (shutret) - ERR("Socket shutdown error"); - } - - return ret; -} - -/* - * Send a message accompanied by fd(s) over a unix socket. - * - * Returns the size of data sent, or negative error value. - */ -ssize_t ustcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd) -{ - struct msghdr msg; - struct cmsghdr *cmptr; - struct iovec iov[1]; - ssize_t ret = -1; - unsigned int sizeof_fds = nb_fd * sizeof(int); - char tmp[CMSG_SPACE(sizeof_fds)]; - char dummy = 0; - - memset(&msg, 0, sizeof(msg)); - memset(tmp, 0, CMSG_SPACE(sizeof_fds) * sizeof(char)); - - if (nb_fd > USTCOMM_MAX_SEND_FDS) - return -EINVAL; - - msg.msg_control = (caddr_t)tmp; - msg.msg_controllen = CMSG_LEN(sizeof_fds); - - cmptr = CMSG_FIRSTHDR(&msg); - if (!cmptr) - return -EINVAL; - cmptr->cmsg_level = SOL_SOCKET; - cmptr->cmsg_type = SCM_RIGHTS; - cmptr->cmsg_len = CMSG_LEN(sizeof_fds); - memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); - /* Sum of the length of all control messages in the buffer: */ - msg.msg_controllen = cmptr->cmsg_len; - - iov[0].iov_base = &dummy; - iov[0].iov_len = 1; - msg.msg_iov = iov; - msg.msg_iovlen = 1; - - do { - ret = sendmsg(sock, &msg, MSG_NOSIGNAL); - } while (ret < 0 && errno == EINTR); - if (ret < 0) { - /* - * We consider EPIPE and ECONNRESET as expected. - */ - if (errno != EPIPE && errno != ECONNRESET) { - PERROR("sendmsg"); - } - ret = -errno; - if (ret == -ECONNRESET) - ret = -EPIPE; - } - return ret; -} - -/* - * Recv a message accompanied by fd(s) from a unix socket. - * - * Expect at most "nb_fd" file descriptors. Returns the number of fd - * actually received in nb_fd. - * Returns -EPIPE on orderly shutdown. - */ -ssize_t ustcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd) -{ - struct iovec iov[1]; - ssize_t ret = 0; - struct cmsghdr *cmsg; - size_t sizeof_fds = nb_fd * sizeof(int); - char recv_fd[CMSG_SPACE(sizeof_fds)]; - struct msghdr msg; - char dummy; - int i; - - memset(&msg, 0, sizeof(msg)); - - /* Prepare to receive the structures */ - iov[0].iov_base = &dummy; - iov[0].iov_len = 1; - msg.msg_iov = iov; - msg.msg_iovlen = 1; - msg.msg_control = recv_fd; - msg.msg_controllen = sizeof(recv_fd); - - do { - ret = recvmsg(sock, &msg, 0); - } while (ret < 0 && errno == EINTR); - if (ret < 0) { - if (errno != EPIPE && errno != ECONNRESET) { - PERROR("recvmsg fds"); - } - ret = -errno; - if (ret == -ECONNRESET) - ret = -EPIPE; - goto end; - } - if (ret == 0) { - /* orderly shutdown */ - ret = -EPIPE; - goto end; - } - if (ret != 1) { - ERR("Error: Received %zd bytes, expected %d\n", - ret, 1); - goto end; - } - if (msg.msg_flags & MSG_CTRUNC) { - ERR("Error: Control message truncated.\n"); - ret = -1; - goto end; - } - cmsg = CMSG_FIRSTHDR(&msg); - if (!cmsg) { - ERR("Error: Invalid control message header\n"); - ret = -1; - goto end; - } - if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) { - ERR("Didn't received any fd\n"); - ret = -1; - goto end; - } - if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) { - ERR("Error: Received %zu bytes of ancillary data, expected %zu\n", - (size_t) cmsg->cmsg_len, (size_t) CMSG_LEN(sizeof_fds)); - ret = -1; - goto end; - } - - memcpy(fds, CMSG_DATA(cmsg), sizeof_fds); - - /* Set FD_CLOEXEC */ - for (i = 0; i < nb_fd; i++) { - ret = fcntl(fds[i], F_SETFD, FD_CLOEXEC); - if (ret < 0) { - PERROR("fcntl failed to set FD_CLOEXEC on fd %d", - fds[i]); - } - } - - ret = nb_fd; -end: - return ret; -} - -int ustcomm_send_app_msg(int sock, struct ustcomm_ust_msg *lum) -{ - ssize_t len; - - len = ustcomm_send_unix_sock(sock, lum, sizeof(*lum)); - switch (len) { - case sizeof(*lum): - break; - default: - if (len < 0) { - return len; - } else { - ERR("incorrect message size: %zd\n", len); - return -EINVAL; - } - } - return 0; -} - -int ustcomm_recv_app_reply(int sock, struct ustcomm_ust_reply *lur, - uint32_t expected_handle, uint32_t expected_cmd) -{ - ssize_t len; - - memset(lur, 0, sizeof(*lur)); - len = ustcomm_recv_unix_sock(sock, lur, sizeof(*lur)); - switch (len) { - case 0: /* orderly shutdown */ - return -EPIPE; - case sizeof(*lur): - { - int err = 0; - - if (lur->handle != expected_handle) { - ERR("Unexpected result message handle: " - "expected: %u vs received: %u\n", - expected_handle, lur->handle); - err = 1; - } - if (lur->cmd != expected_cmd) { - ERR("Unexpected result message command " - "expected: %u vs received: %u\n", - expected_cmd, lur->cmd); - err = 1; - } - if (err) { - return -EINVAL; - } else { - return lur->ret_code; - } - } - default: - if (len >= 0) { - ERR("incorrect message size: %zd\n", len); - } - return len; - } -} - -int ustcomm_send_app_cmd(int sock, - struct ustcomm_ust_msg *lum, - struct ustcomm_ust_reply *lur) -{ - int ret; - - ret = ustcomm_send_app_msg(sock, lum); - if (ret) - return ret; - ret = ustcomm_recv_app_reply(sock, lur, lum->handle, lum->cmd); - if (ret > 0) - return -EIO; - return ret; -} - -/* - * chan_data is allocated internally if this function returns the - * expected var_len. - */ -ssize_t ustcomm_recv_channel_from_sessiond(int sock, - void **_chan_data, uint64_t var_len, - int *_wakeup_fd) -{ - void *chan_data; - ssize_t len, nr_fd; - int wakeup_fd, ret; - - if (var_len > LTTNG_UST_ABI_CHANNEL_DATA_MAX_LEN) { - len = -EINVAL; - goto error_check; - } - /* Receive variable length data */ - chan_data = zmalloc(var_len); - if (!chan_data) { - len = -ENOMEM; - goto error_alloc; - } - len = ustcomm_recv_unix_sock(sock, chan_data, var_len); - if (len != var_len) { - goto error_recv; - } - /* recv wakeup fd */ - lttng_ust_lock_fd_tracker(); - nr_fd = ustcomm_recv_fds_unix_sock(sock, &wakeup_fd, 1); - if (nr_fd <= 0) { - lttng_ust_unlock_fd_tracker(); - if (nr_fd < 0) { - len = nr_fd; - goto error_recv; - } else { - len = -EIO; - goto error_recv; - } - } - - ret = lttng_ust_add_fd_to_tracker(wakeup_fd); - if (ret < 0) { - ret = close(wakeup_fd); - if (ret) { - PERROR("close on wakeup_fd"); - } - len = -EIO; - lttng_ust_unlock_fd_tracker(); - goto error_recv; - } - - *_wakeup_fd = ret; - lttng_ust_unlock_fd_tracker(); - - *_chan_data = chan_data; - return len; - -error_recv: - free(chan_data); -error_alloc: -error_check: - return len; -} - -ssize_t ustcomm_recv_event_notifier_notif_fd_from_sessiond(int sock, - int *_event_notifier_notif_fd) -{ - ssize_t nr_fd; - int event_notifier_notif_fd, ret; - - /* Receive event_notifier notification fd */ - lttng_ust_lock_fd_tracker(); - nr_fd = ustcomm_recv_fds_unix_sock(sock, &event_notifier_notif_fd, 1); - if (nr_fd <= 0) { - lttng_ust_unlock_fd_tracker(); - if (nr_fd < 0) { - ret = nr_fd; - goto error; - } else { - ret = -EIO; - goto error; - } - } - - ret = lttng_ust_add_fd_to_tracker(event_notifier_notif_fd); - if (ret < 0) { - ret = close(event_notifier_notif_fd); - if (ret) { - PERROR("close on event_notifier notif fd"); - } - ret = -EIO; - lttng_ust_unlock_fd_tracker(); - goto error; - } - - *_event_notifier_notif_fd = ret; - lttng_ust_unlock_fd_tracker(); - - ret = nr_fd; - -error: - return ret; -} - -int ustcomm_recv_stream_from_sessiond(int sock, - uint64_t *memory_map_size __attribute__((unused)), - int *shm_fd, int *wakeup_fd) -{ - ssize_t len; - int ret; - int fds[2]; - - /* recv shm fd and wakeup fd */ - lttng_ust_lock_fd_tracker(); - len = ustcomm_recv_fds_unix_sock(sock, fds, 2); - if (len <= 0) { - lttng_ust_unlock_fd_tracker(); - if (len < 0) { - ret = len; - goto error; - } else { - ret = -EIO; - goto error; - } - } - - ret = lttng_ust_add_fd_to_tracker(fds[0]); - if (ret < 0) { - ret = close(fds[0]); - if (ret) { - PERROR("close on received shm_fd"); - } - ret = -EIO; - lttng_ust_unlock_fd_tracker(); - goto error; - } - *shm_fd = ret; - - ret = lttng_ust_add_fd_to_tracker(fds[1]); - if (ret < 0) { - ret = close(*shm_fd); - if (ret) { - PERROR("close on shm_fd"); - } - *shm_fd = -1; - ret = close(fds[1]); - if (ret) { - PERROR("close on received wakeup_fd"); - } - ret = -EIO; - lttng_ust_unlock_fd_tracker(); - goto error; - } - *wakeup_fd = ret; - lttng_ust_unlock_fd_tracker(); - return 0; - -error: - return ret; -} - -ssize_t ustcomm_recv_counter_from_sessiond(int sock, - void **_counter_data, uint64_t var_len) -{ - void *counter_data; - ssize_t len; - - if (var_len > LTTNG_UST_ABI_COUNTER_DATA_MAX_LEN) { - len = -EINVAL; - goto error_check; - } - /* Receive variable length data */ - counter_data = zmalloc(var_len); - if (!counter_data) { - len = -ENOMEM; - goto error_alloc; - } - len = ustcomm_recv_unix_sock(sock, counter_data, var_len); - if (len != var_len) { - goto error_recv; - } - *_counter_data = counter_data; - return len; - -error_recv: - free(counter_data); -error_alloc: -error_check: - return len; -} - -int ustcomm_recv_counter_shm_from_sessiond(int sock, - int *shm_fd) -{ - ssize_t len; - int ret; - int fds[1]; - - /* recv shm fd fd */ - lttng_ust_lock_fd_tracker(); - len = ustcomm_recv_fds_unix_sock(sock, fds, 1); - if (len <= 0) { - lttng_ust_unlock_fd_tracker(); - if (len < 0) { - ret = len; - goto error; - } else { - ret = -EIO; - goto error; - } - } - - ret = lttng_ust_add_fd_to_tracker(fds[0]); - if (ret < 0) { - ret = close(fds[0]); - if (ret) { - PERROR("close on received shm_fd"); - } - ret = -EIO; - lttng_ust_unlock_fd_tracker(); - goto error; - } - *shm_fd = ret; - lttng_ust_unlock_fd_tracker(); - return 0; - -error: - return ret; -} - -/* - * Returns 0 on success, negative error value on error. - */ -int ustcomm_send_reg_msg(int sock, - enum ustctl_socket_type type, - uint32_t bits_per_long, - uint32_t uint8_t_alignment, - uint32_t uint16_t_alignment, - uint32_t uint32_t_alignment, - uint32_t uint64_t_alignment, - uint32_t long_alignment) -{ - ssize_t len; - struct ustctl_reg_msg reg_msg; - - reg_msg.magic = LTTNG_UST_ABI_COMM_MAGIC; - reg_msg.major = LTTNG_UST_ABI_MAJOR_VERSION; - reg_msg.minor = LTTNG_UST_ABI_MINOR_VERSION; - reg_msg.pid = getpid(); - reg_msg.ppid = getppid(); - reg_msg.uid = getuid(); - reg_msg.gid = getgid(); - reg_msg.bits_per_long = bits_per_long; - reg_msg.uint8_t_alignment = uint8_t_alignment; - reg_msg.uint16_t_alignment = uint16_t_alignment; - reg_msg.uint32_t_alignment = uint32_t_alignment; - reg_msg.uint64_t_alignment = uint64_t_alignment; - reg_msg.long_alignment = long_alignment; - reg_msg.socket_type = type; - lttng_pthread_getname_np(reg_msg.name, LTTNG_UST_ABI_PROCNAME_LEN); - memset(reg_msg.padding, 0, sizeof(reg_msg.padding)); - - len = ustcomm_send_unix_sock(sock, ®_msg, sizeof(reg_msg)); - if (len > 0 && len != sizeof(reg_msg)) - return -EIO; - if (len < 0) - return len; - return 0; -} - -static -ssize_t count_one_type(const struct lttng_ust_type_common *lt) -{ - switch (lt->type) { - case lttng_ust_type_integer: - case lttng_ust_type_float: - case lttng_ust_type_string: - return 1; - case lttng_ust_type_enum: - return count_one_type(lttng_ust_get_type_enum(lt)->container_type) + 1; - case lttng_ust_type_array: - return count_one_type(lttng_ust_get_type_array(lt)->elem_type) + 1; - case lttng_ust_type_sequence: - return count_one_type(lttng_ust_get_type_sequence(lt)->elem_type) + 1; - case lttng_ust_type_struct: - return count_fields_recursive(lttng_ust_get_type_struct(lt)->nr_fields, - lttng_ust_get_type_struct(lt)->fields) + 1; - - case lttng_ust_type_dynamic: - { - const struct lttng_ust_event_field **choices; - size_t nr_choices; - int ret; - - ret = lttng_ust_dynamic_type_choices(&nr_choices, - &choices); - if (ret) - return ret; - /* - * Two fields for enum, one field for variant, and - * one field per choice. - */ - return count_fields_recursive(nr_choices, choices) + 3; - } - - default: - return -EINVAL; - } - return 0; -} - -static -ssize_t count_fields_recursive(size_t nr_fields, - const struct lttng_ust_event_field **lttng_fields) -{ - int i; - ssize_t ret, count = 0; - - for (i = 0; i < nr_fields; i++) { - const struct lttng_ust_event_field *lf; - - lf = lttng_fields[i]; - /* skip 'nowrite' fields */ - if (lf->nowrite) - continue; - ret = count_one_type(lf->type); - if (ret < 0) - return ret; /* error */ - count += ret; - } - return count; -} - -static -ssize_t count_ctx_fields_recursive(size_t nr_fields, - struct lttng_ust_ctx_field *lttng_fields) -{ - int i; - ssize_t ret, count = 0; - - for (i = 0; i < nr_fields; i++) { - const struct lttng_ust_event_field *lf; - - lf = lttng_fields[i].event_field; - /* skip 'nowrite' fields */ - if (lf->nowrite) - continue; - ret = count_one_type(lf->type); - if (ret < 0) - return ret; /* error */ - count += ret; - } - return count; -} - -static -int serialize_string_encoding(int32_t *ue, - enum lttng_ust_string_encoding le) -{ - switch (le) { - case lttng_ust_string_encoding_none: - *ue = ustctl_encode_none; - break; - case lttng_ust_string_encoding_UTF8: - *ue = ustctl_encode_UTF8; - break; - case lttng_ust_string_encoding_ASCII: - *ue = ustctl_encode_ASCII; - break; - default: - return -EINVAL; - } - return 0; -} - -static -int serialize_integer_type(struct ustctl_integer_type *uit, - const struct lttng_ust_type_integer *lit, - enum lttng_ust_string_encoding lencoding) -{ - int32_t encoding; - - uit->size = lit->size; - uit->signedness = lit->signedness; - uit->reverse_byte_order = lit->reverse_byte_order; - uit->base = lit->base; - if (serialize_string_encoding(&encoding, lencoding)) - return -EINVAL; - uit->encoding = encoding; - uit->alignment = lit->alignment; - return 0; -} - -static -int serialize_dynamic_type(struct lttng_ust_session *session, - struct ustctl_field *fields, size_t *iter_output, - const char *field_name) -{ - const struct lttng_ust_event_field **choices; - char tag_field_name[LTTNG_UST_ABI_SYM_NAME_LEN]; - const struct lttng_ust_type_common *tag_type; - const struct lttng_ust_event_field *tag_field_generic; - struct lttng_ust_event_field tag_field = { - .name = tag_field_name, - .nowrite = 0, - }; - struct ustctl_field *uf; - size_t nr_choices, i; - int ret; - - tag_field_generic = lttng_ust_dynamic_type_tag_field(); - tag_type = tag_field_generic->type; - - /* Serialize enum field. */ - strncpy(tag_field_name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); - tag_field_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - strncat(tag_field_name, - "_tag", - LTTNG_UST_ABI_SYM_NAME_LEN - strlen(tag_field_name) - 1); - tag_field.type = tag_type; - ret = serialize_one_field(session, fields, iter_output, - &tag_field); - if (ret) - return ret; - - /* Serialize variant field. */ - uf = &fields[*iter_output]; - ret = lttng_ust_dynamic_type_choices(&nr_choices, &choices); - if (ret) - return ret; - - strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); - uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - uf->type.atype = ustctl_atype_variant; - uf->type.u.variant_nestable.nr_choices = nr_choices; - strncpy(uf->type.u.variant_nestable.tag_name, - tag_field_name, - LTTNG_UST_ABI_SYM_NAME_LEN); - uf->type.u.variant_nestable.tag_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - uf->type.u.variant_nestable.alignment = 0; - (*iter_output)++; - - /* Serialize choice fields after variant. */ - for (i = 0; i < nr_choices; i++) { - ret = serialize_one_field(session, fields, - iter_output, choices[i]); - if (ret) - return ret; - } - return 0; -} - -static -int serialize_one_type(struct lttng_ust_session *session, - struct ustctl_field *fields, size_t *iter_output, - const char *field_name, const struct lttng_ust_type_common *lt, - enum lttng_ust_string_encoding parent_encoding) -{ - int ret; - - /* - * Serializing a type (rather than a field) generates a ustctl_field - * entry with 0-length name. - */ - - switch (lt->type) { - case lttng_ust_type_integer: - { - struct ustctl_field *uf = &fields[*iter_output]; - struct ustctl_type *ut = &uf->type; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); - uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - ret = serialize_integer_type(&ut->u.integer, lttng_ust_get_type_integer(lt), - parent_encoding); - if (ret) - return ret; - ut->atype = ustctl_atype_integer; - (*iter_output)++; - break; - } - case lttng_ust_type_float: - { - struct ustctl_field *uf = &fields[*iter_output]; - struct ustctl_type *ut = &uf->type; - struct ustctl_float_type *uft; - const struct lttng_ust_type_float *lft; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); - uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - uft = &ut->u._float; - lft = lttng_ust_get_type_float(lt); - uft->exp_dig = lft->exp_dig; - uft->mant_dig = lft->mant_dig; - uft->alignment = lft->alignment; - uft->reverse_byte_order = lft->reverse_byte_order; - ut->atype = ustctl_atype_float; - (*iter_output)++; - break; - } - case lttng_ust_type_string: - { - struct ustctl_field *uf = &fields[*iter_output]; - struct ustctl_type *ut = &uf->type; - int32_t encoding; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); - uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - ret = serialize_string_encoding(&encoding, lttng_ust_get_type_string(lt)->encoding); - if (ret) - return ret; - ut->u.string.encoding = encoding; - ut->atype = ustctl_atype_string; - (*iter_output)++; - break; - } - case lttng_ust_type_array: - { - struct ustctl_field *uf = &fields[*iter_output]; - struct ustctl_type *ut = &uf->type; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); - uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - ut->atype = ustctl_atype_array_nestable; - ut->u.array_nestable.length = lttng_ust_get_type_array(lt)->length; - ut->u.array_nestable.alignment = lttng_ust_get_type_array(lt)->alignment; - (*iter_output)++; - - ret = serialize_one_type(session, fields, iter_output, NULL, - lttng_ust_get_type_array(lt)->elem_type, - lttng_ust_get_type_array(lt)->encoding); - if (ret) - return -EINVAL; - break; - } - case lttng_ust_type_sequence: - { - struct ustctl_field *uf = &fields[*iter_output]; - struct ustctl_type *ut = &uf->type; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); - uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - ut->atype = ustctl_atype_sequence_nestable; - strncpy(ut->u.sequence_nestable.length_name, - lttng_ust_get_type_sequence(lt)->length_name, - LTTNG_UST_ABI_SYM_NAME_LEN); - ut->u.sequence_nestable.length_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - ut->u.sequence_nestable.alignment = lttng_ust_get_type_sequence(lt)->alignment; - (*iter_output)++; - - ret = serialize_one_type(session, fields, iter_output, NULL, - lttng_ust_get_type_sequence(lt)->elem_type, - lttng_ust_get_type_sequence(lt)->encoding); - if (ret) - return -EINVAL; - break; - } - case lttng_ust_type_dynamic: - { - ret = serialize_dynamic_type(session, fields, iter_output, - field_name); - if (ret) - return -EINVAL; - break; - } - case lttng_ust_type_struct: - { - struct ustctl_field *uf = &fields[*iter_output]; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); - uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - uf->type.atype = ustctl_atype_struct_nestable; - uf->type.u.struct_nestable.nr_fields = lttng_ust_get_type_struct(lt)->nr_fields; - uf->type.u.struct_nestable.alignment = lttng_ust_get_type_struct(lt)->alignment; - (*iter_output)++; - - ret = serialize_fields(session, fields, iter_output, - lttng_ust_get_type_struct(lt)->nr_fields, - lttng_ust_get_type_struct(lt)->fields); - if (ret) - return -EINVAL; - break; - } - case lttng_ust_type_enum: - { - struct ustctl_field *uf = &fields[*iter_output]; - struct ustctl_type *ut = &uf->type; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN); - uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - strncpy(ut->u.enum_nestable.name, lttng_ust_get_type_enum(lt)->desc->name, - LTTNG_UST_ABI_SYM_NAME_LEN); - ut->u.enum_nestable.name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - ut->atype = ustctl_atype_enum_nestable; - (*iter_output)++; - - ret = serialize_one_type(session, fields, iter_output, NULL, - lttng_ust_get_type_enum(lt)->container_type, - lttng_ust_string_encoding_none); - if (ret) - return -EINVAL; - if (session) { - const struct lttng_enum *_enum; - - _enum = lttng_ust_enum_get_from_desc(session, lttng_ust_get_type_enum(lt)->desc); - if (!_enum) - return -EINVAL; - ut->u.enum_nestable.id = _enum->id; - } else { - ut->u.enum_nestable.id = -1ULL; - } - break; - } - default: - return -EINVAL; - } - return 0; -} - -static -int serialize_one_field(struct lttng_ust_session *session, - struct ustctl_field *fields, size_t *iter_output, - const struct lttng_ust_event_field *lf) -{ - /* skip 'nowrite' fields */ - if (lf->nowrite) - return 0; - - return serialize_one_type(session, fields, iter_output, lf->name, lf->type, lttng_ust_string_encoding_none); -} - -static -int serialize_fields(struct lttng_ust_session *session, - struct ustctl_field *ustctl_fields, - size_t *iter_output, size_t nr_lttng_fields, - const struct lttng_ust_event_field **lttng_fields) -{ - int ret; - size_t i; - - for (i = 0; i < nr_lttng_fields; i++) { - ret = serialize_one_field(session, ustctl_fields, - iter_output, lttng_fields[i]); - if (ret) - return ret; - } - return 0; -} - -static -int alloc_serialize_fields(struct lttng_ust_session *session, - size_t *_nr_write_fields, - struct ustctl_field **ustctl_fields, - size_t nr_fields, - const struct lttng_ust_event_field **lttng_fields) -{ - struct ustctl_field *fields; - int ret; - size_t iter_output = 0; - ssize_t nr_write_fields; - - nr_write_fields = count_fields_recursive(nr_fields, lttng_fields); - if (nr_write_fields < 0) { - return (int) nr_write_fields; - } - - fields = zmalloc(nr_write_fields * sizeof(*fields)); - if (!fields) - return -ENOMEM; - - ret = serialize_fields(session, fields, &iter_output, nr_fields, - lttng_fields); - if (ret) - goto error_type; - - *_nr_write_fields = nr_write_fields; - *ustctl_fields = fields; - return 0; - -error_type: - free(fields); - return ret; -} - -static -int serialize_entries(struct ustctl_enum_entry **_entries, - size_t nr_entries, - const struct lttng_ust_enum_entry **lttng_entries) -{ - struct ustctl_enum_entry *entries; - int i; - - /* Serialize the entries */ - entries = zmalloc(nr_entries * sizeof(*entries)); - if (!entries) - return -ENOMEM; - for (i = 0; i < nr_entries; i++) { - struct ustctl_enum_entry *uentry; - const struct lttng_ust_enum_entry *lentry; - - uentry = &entries[i]; - lentry = lttng_entries[i]; - - uentry->start.value = lentry->start.value; - uentry->start.signedness = lentry->start.signedness; - uentry->end.value = lentry->end.value; - uentry->end.signedness = lentry->end.signedness; - strncpy(uentry->string, lentry->string, LTTNG_UST_ABI_SYM_NAME_LEN); - uentry->string[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - - if (lentry->options & LTTNG_UST_ENUM_ENTRY_OPTION_IS_AUTO) { - uentry->u.extra.options |= - USTCTL_UST_ENUM_ENTRY_OPTION_IS_AUTO; - } - } - *_entries = entries; - return 0; -} - -static -int serialize_ctx_fields(struct lttng_ust_session *session, - size_t *_nr_write_fields, - struct ustctl_field **ustctl_fields, - size_t nr_fields, - struct lttng_ust_ctx_field *lttng_fields) -{ - struct ustctl_field *fields; - int ret; - size_t i, iter_output = 0; - ssize_t nr_write_fields; - - nr_write_fields = count_ctx_fields_recursive(nr_fields, - lttng_fields); - if (nr_write_fields < 0) { - return (int) nr_write_fields; - } - - fields = zmalloc(nr_write_fields * sizeof(*fields)); - if (!fields) - return -ENOMEM; - - for (i = 0; i < nr_fields; i++) { - ret = serialize_one_field(session, fields, &iter_output, - lttng_fields[i].event_field); - if (ret) - goto error_type; - } - - *_nr_write_fields = nr_write_fields; - *ustctl_fields = fields; - return 0; - -error_type: - free(fields); - return ret; -} - -/* - * Returns 0 on success, negative error value on error. - */ -int ustcomm_register_event(int sock, - struct lttng_ust_session *session, - int session_objd, /* session descriptor */ - int channel_objd, /* channel descriptor */ - const char *event_name, /* event name (input) */ - int loglevel, - const char *signature, /* event signature (input) */ - size_t nr_fields, /* fields */ - const struct lttng_ust_event_field **lttng_fields, - const char *model_emf_uri, - uint32_t *id) /* event id (output) */ -{ - ssize_t len; - struct { - struct ustcomm_notify_hdr header; - struct ustcomm_notify_event_msg m; - } msg; - struct { - struct ustcomm_notify_hdr header; - struct ustcomm_notify_event_reply r; - } reply; - size_t signature_len, fields_len, model_emf_uri_len; - struct ustctl_field *fields = NULL; - size_t nr_write_fields = 0; - int ret; - - memset(&msg, 0, sizeof(msg)); - msg.header.notify_cmd = USTCTL_NOTIFY_CMD_EVENT; - msg.m.session_objd = session_objd; - msg.m.channel_objd = channel_objd; - strncpy(msg.m.event_name, event_name, LTTNG_UST_ABI_SYM_NAME_LEN); - msg.m.event_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - msg.m.loglevel = loglevel; - signature_len = strlen(signature) + 1; - msg.m.signature_len = signature_len; - - /* Calculate fields len, serialize fields. */ - if (nr_fields > 0) { - ret = alloc_serialize_fields(session, &nr_write_fields, &fields, - nr_fields, lttng_fields); - if (ret) - return ret; - } - - fields_len = sizeof(*fields) * nr_write_fields; - msg.m.fields_len = fields_len; - if (model_emf_uri) { - model_emf_uri_len = strlen(model_emf_uri) + 1; - } else { - model_emf_uri_len = 0; - } - msg.m.model_emf_uri_len = model_emf_uri_len; - - len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg)); - if (len > 0 && len != sizeof(msg)) { - ret = -EIO; - goto error_fields; - } - if (len < 0) { - ret = len; - goto error_fields; - } - - /* send signature */ - len = ustcomm_send_unix_sock(sock, signature, signature_len); - if (len > 0 && len != signature_len) { - ret = -EIO; - goto error_fields; - } - if (len < 0) { - ret = len; - goto error_fields; - } - - /* send fields */ - if (fields_len > 0) { - len = ustcomm_send_unix_sock(sock, fields, fields_len); - if (len > 0 && len != fields_len) { - ret = -EIO; - goto error_fields; - } - if (len < 0) { - ret = len; - goto error_fields; - } - } - free(fields); - - if (model_emf_uri_len) { - /* send model_emf_uri */ - len = ustcomm_send_unix_sock(sock, model_emf_uri, - model_emf_uri_len); - if (len > 0 && len != model_emf_uri_len) { - return -EIO; - } - if (len < 0) { - return len; - } - } - - /* receive reply */ - len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply)); - switch (len) { - case 0: /* orderly shutdown */ - return -EPIPE; - case sizeof(reply): - if (reply.header.notify_cmd != msg.header.notify_cmd) { - ERR("Unexpected result message command " - "expected: %u vs received: %u\n", - msg.header.notify_cmd, reply.header.notify_cmd); - return -EINVAL; - } - if (reply.r.ret_code > 0) - return -EINVAL; - if (reply.r.ret_code < 0) - return reply.r.ret_code; - *id = reply.r.event_id; - DBG("Sent register event notification for name \"%s\": ret_code %d, event_id %u\n", - event_name, reply.r.ret_code, reply.r.event_id); - return 0; - default: - if (len < 0) { - /* Transport level error */ - if (errno == EPIPE || errno == ECONNRESET) - len = -errno; - return len; - } else { - ERR("incorrect message size: %zd\n", len); - return len; - } - } - /* Unreached. */ - - /* Error path only. */ -error_fields: - free(fields); - return ret; -} - -/* - * Returns 0 on success, negative error value on error. - * Returns -EPIPE or -ECONNRESET if other end has hung up. - */ -int ustcomm_register_enum(int sock, - int session_objd, /* session descriptor */ - const char *enum_name, /* enum name (input) */ - size_t nr_entries, /* entries */ - const struct lttng_ust_enum_entry **lttng_entries, - uint64_t *id) -{ - ssize_t len; - struct { - struct ustcomm_notify_hdr header; - struct ustcomm_notify_enum_msg m; - } msg; - struct { - struct ustcomm_notify_hdr header; - struct ustcomm_notify_enum_reply r; - } reply; - size_t entries_len; - struct ustctl_enum_entry *entries = NULL; - int ret; - - memset(&msg, 0, sizeof(msg)); - msg.header.notify_cmd = USTCTL_NOTIFY_CMD_ENUM; - msg.m.session_objd = session_objd; - strncpy(msg.m.enum_name, enum_name, LTTNG_UST_ABI_SYM_NAME_LEN); - msg.m.enum_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; - - /* Calculate entries len, serialize entries. */ - if (nr_entries > 0) { - ret = serialize_entries(&entries, - nr_entries, lttng_entries); - if (ret) - return ret; - } - - entries_len = sizeof(*entries) * nr_entries; - msg.m.entries_len = entries_len; - - len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg)); - if (len > 0 && len != sizeof(msg)) { - ret = -EIO; - goto error_entries; - } - if (len < 0) { - ret = len; - goto error_entries; - } - - /* send entries */ - if (entries_len > 0) { - len = ustcomm_send_unix_sock(sock, entries, entries_len); - if (len > 0 && len != entries_len) { - ret = -EIO; - goto error_entries; - } - if (len < 0) { - ret = len; - goto error_entries; - } - } - free(entries); - entries = NULL; - - /* receive reply */ - len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply)); - switch (len) { - case 0: /* orderly shutdown */ - return -EPIPE; - case sizeof(reply): - if (reply.header.notify_cmd != msg.header.notify_cmd) { - ERR("Unexpected result message command " - "expected: %u vs received: %u\n", - msg.header.notify_cmd, reply.header.notify_cmd); - return -EINVAL; - } - if (reply.r.ret_code > 0) - return -EINVAL; - if (reply.r.ret_code < 0) - return reply.r.ret_code; - *id = reply.r.enum_id; - DBG("Sent register enum notification for name \"%s\": ret_code %d\n", - enum_name, reply.r.ret_code); - return 0; - default: - if (len < 0) { - /* Transport level error */ - if (errno == EPIPE || errno == ECONNRESET) - len = -errno; - return len; - } else { - ERR("incorrect message size: %zd\n", len); - return len; - } - } - return ret; - -error_entries: - free(entries); - return ret; -} - -/* - * Returns 0 on success, negative error value on error. - * Returns -EPIPE or -ECONNRESET if other end has hung up. - */ -int ustcomm_register_channel(int sock, - struct lttng_ust_session *session, - int session_objd, /* session descriptor */ - int channel_objd, /* channel descriptor */ - size_t nr_ctx_fields, - struct lttng_ust_ctx_field *ctx_fields, - uint32_t *chan_id, /* channel id (output) */ - int *header_type) /* header type (output) */ -{ - ssize_t len; - struct { - struct ustcomm_notify_hdr header; - struct ustcomm_notify_channel_msg m; - } msg; - struct { - struct ustcomm_notify_hdr header; - struct ustcomm_notify_channel_reply r; - } reply; - size_t fields_len; - struct ustctl_field *fields = NULL; - int ret; - size_t nr_write_fields = 0; - - memset(&msg, 0, sizeof(msg)); - msg.header.notify_cmd = USTCTL_NOTIFY_CMD_CHANNEL; - msg.m.session_objd = session_objd; - msg.m.channel_objd = channel_objd; - - /* Calculate fields len, serialize fields. */ - if (nr_ctx_fields > 0) { - ret = serialize_ctx_fields(session, &nr_write_fields, &fields, - nr_ctx_fields, ctx_fields); - if (ret) - return ret; - } - - fields_len = sizeof(*fields) * nr_write_fields; - msg.m.ctx_fields_len = fields_len; - len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg)); - if (len > 0 && len != sizeof(msg)) { - free(fields); - return -EIO; - } - if (len < 0) { - free(fields); - return len; - } - - /* send fields */ - if (fields_len > 0) { - len = ustcomm_send_unix_sock(sock, fields, fields_len); - free(fields); - if (len > 0 && len != fields_len) { - return -EIO; - } - if (len < 0) { - return len; - } - } else { - free(fields); - } - - len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply)); - switch (len) { - case 0: /* orderly shutdown */ - return -EPIPE; - case sizeof(reply): - if (reply.header.notify_cmd != msg.header.notify_cmd) { - ERR("Unexpected result message command " - "expected: %u vs received: %u\n", - msg.header.notify_cmd, reply.header.notify_cmd); - return -EINVAL; - } - if (reply.r.ret_code > 0) - return -EINVAL; - if (reply.r.ret_code < 0) - return reply.r.ret_code; - *chan_id = reply.r.chan_id; - switch (reply.r.header_type) { - case 1: - case 2: - *header_type = reply.r.header_type; - break; - default: - ERR("Unexpected channel header type %u\n", - reply.r.header_type); - return -EINVAL; - } - DBG("Sent register channel notification: chan_id %d, header_type %d\n", - reply.r.chan_id, reply.r.header_type); - return 0; - default: - if (len < 0) { - /* Transport level error */ - if (errno == EPIPE || errno == ECONNRESET) - len = -errno; - return len; - } else { - ERR("incorrect message size: %zd\n", len); - return len; - } - } -} - -/* - * Set socket reciving timeout. - */ -int ustcomm_setsockopt_rcv_timeout(int sock, unsigned int msec) -{ - int ret; - struct timeval tv; - - tv.tv_sec = msec / 1000; - tv.tv_usec = (msec * 1000 % 1000000); - - ret = setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)); - if (ret < 0) { - PERROR("setsockopt SO_RCVTIMEO"); - ret = -errno; - } - - return ret; -} - -/* - * Set socket sending timeout. - */ -int ustcomm_setsockopt_snd_timeout(int sock, unsigned int msec) -{ - int ret; - struct timeval tv; - - tv.tv_sec = msec / 1000; - tv.tv_usec = (msec * 1000) % 1000000; - - ret = setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)); - if (ret < 0) { - PERROR("setsockopt SO_SNDTIMEO"); - ret = -errno; - } - - return ret; -} diff --git a/src/liblttng-ust/Makefile.am b/src/liblttng-ust/Makefile.am index 87380bc4..d064fad6 100644 --- a/src/liblttng-ust/Makefile.am +++ b/src/liblttng-ust/Makefile.am @@ -141,8 +141,8 @@ liblttng_ust_support_la_LIBADD = \ liblttng_ust_la_LIBADD = \ -lrt \ liblttng-ust-common.la \ + $(top_builddir)/src/common/libustcomm.la \ $(top_builddir)/src/common/libcommon.la \ - $(top_builddir)/src/liblttng-ust-comm/liblttng-ust-comm.la \ liblttng-ust-tracepoint.la \ liblttng-ust-runtime.la liblttng-ust-support.la \ $(DL_LIBS)