-/* Copyright (C) 2009 Pierre-Marc Fournier, Philippe Proulx-Barrette
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * 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
-#include <stdio.h>
-#include <unistd.h>
-#include <getopt.h>
-#include <stdlib.h>
-#include <fcntl.h>
-#include <string.h>
-#include <dirent.h>
-
-#include "ustcomm.h"
-#include "ust/ustcmd.h"
-#include "usterr.h"
-
-static int do_cmd(const pid_t pid,
- const struct ustcomm_header *req_header,
- const char *req_data,
- struct ustcomm_header *res_header,
- char **res_data)
-{
- int app_fd, result, saved_errno = 0;
- char *recv_buf;
-
- if (ustcomm_connect_app(pid, &app_fd)) {
- ERR("could not connect to PID %u", (unsigned int) pid);
- errno = ENOTCONN;
- return -1;
- }
-
- recv_buf = zmalloc(USTCOMM_BUFFER_SIZE);
- if (!recv_buf) {
- saved_errno = ENOMEM;
- goto close_app_fd;
- }
-
- result = ustcomm_req(app_fd, req_header, req_data, res_header, recv_buf);
- if (result > 0) {
- saved_errno = -res_header->result;
- if (res_header->size == 0 || saved_errno > 0) {
- free(recv_buf);
- } else {
- if (res_data) {
- *res_data = recv_buf;
- } else {
- free(recv_buf);
- }
- }
- } else {
- ERR("ustcomm req failed");
- if (result == 0) {
- saved_errno = ENOTCONN;
- } else {
- saved_errno = -result;
- }
- free(recv_buf);
- }
-
-close_app_fd:
- close(app_fd);
-
- errno = saved_errno;
-
- if (errno) {
- return -1;
- }
-
- return 0;
-}
-
-pid_t *ustcmd_get_online_pids(void)
-{
- struct dirent *dirent;
- DIR *dir;
- unsigned int ret_size = 1 * sizeof(pid_t), i = 0;
-
- dir = opendir(SOCK_DIR);
- if (!dir) {
- return NULL;
- }
-
- pid_t *ret = (pid_t *) malloc(ret_size);
-
- while ((dirent = readdir(dir))) {
- if (!strcmp(dirent->d_name, ".") ||
- !strcmp(dirent->d_name, "..")) {
-
- continue;
- }
-
- if (dirent->d_type != DT_DIR &&
- !!strcmp(dirent->d_name, "ust-consumer")) {
-
- sscanf(dirent->d_name, "%u", (unsigned int *) &ret[i]);
- /* FIXME: Here we previously called pid_is_online, which
- * always returned 1, now I replaced it with just 1.
- * We need to figure out an intelligent way of solving
- * this, maybe connect-disconnect.
- */
- if (1) {
- ret_size += sizeof(pid_t);
- ret = (pid_t *) realloc(ret, ret_size);
- ++i;
- }
- }
- }
-
- ret[i] = 0; /* Array end */
-
- if (ret[0] == 0) {
- /* No PID at all */
- free(ret);
- return NULL;
- }
-
- closedir(dir);
- return ret;
-}
-
-/**
- * Sets marker state (USTCMD_MS_ON or USTCMD_MS_OFF).
- *
- * @param mn Marker name
- * @param state Marker's new state
- * @param pid Traced process ID
- * @return 0 if successful, or errors {USTCMD_ERR_GEN, USTCMD_ERR_ARG}
- */
-int ustcmd_set_marker_state(const char *trace, const char *channel,
- const char *marker, int state, pid_t pid)
-{
- struct ustcomm_header req_header, res_header;
- struct ustcomm_marker_info marker_inf;
- int result;
-
- result = ustcomm_pack_marker_info(&req_header,
- &marker_inf,
- trace,
- channel,
- marker);
- if (result < 0) {
- errno = -result;
- return -1;
- }
-
- req_header.command = state ? ENABLE_MARKER : DISABLE_MARKER;
-
- return do_cmd(pid, &req_header, (char *)&marker_inf,
- &res_header, NULL);
-}
-
-/**
- * Set subbuffer size.
- *
- * @param channel_size Channel name and size
- * @param pid Traced process ID
- * @return 0 if successful, or error
- */
-int ustcmd_set_subbuf_size(const char *trace, const char *channel,
- unsigned int subbuf_size, pid_t pid)
-{
- struct ustcomm_header req_header, res_header;
- struct ustcomm_channel_info ch_inf;
- int result;
-
- result = ustcomm_pack_channel_info(&req_header,
- &ch_inf,
- trace,
- channel);
- if (result < 0) {
- errno = -result;
- return -1;
- }
-
- req_header.command = SET_SUBBUF_SIZE;
- ch_inf.subbuf_size = subbuf_size;
-
- return do_cmd(pid, &req_header, (char *)&ch_inf,
- &res_header, NULL);
-}
-
-/**
- * Set subbuffer num.
- *
- * @param channel_num Channel name and num
- * @param pid Traced process ID
- * @return 0 if successful, or error
- */
-int ustcmd_set_subbuf_num(const char *trace, const char *channel,
- unsigned int num, pid_t pid)
-{
- struct ustcomm_header req_header, res_header;
- struct ustcomm_channel_info ch_inf;
- int result;
-
- result = ustcomm_pack_channel_info(&req_header,
- &ch_inf,
- trace,
- channel);
- if (result < 0) {
- errno = -result;
- return -1;
- }
-
- req_header.command = SET_SUBBUF_NUM;
- ch_inf.subbuf_num = num;
-
- return do_cmd(pid, &req_header, (char *)&ch_inf,
- &res_header, NULL);
-
-}
-
-static int ustcmd_get_subbuf_num_size(const char *trace, const char *channel,
- pid_t pid, int *num, int *size)
-{
- struct ustcomm_header req_header, res_header;
- struct ustcomm_channel_info ch_inf, *ch_inf_res;
- int result;
-
-
- result = ustcomm_pack_channel_info(&req_header,
- &ch_inf,
- trace,
- channel);
- if (result < 0) {
- errno = -result;
- return -1;
- }
-
- req_header.command = GET_SUBBUF_NUM_SIZE;
-
- result = do_cmd(pid, &req_header, (char *)&ch_inf,
- &res_header, (char **)&ch_inf_res);
- if (result < 0) {
- return -1;
- }
-
- *num = ch_inf_res->subbuf_num;
- *size = ch_inf_res->subbuf_size;
-
- free(ch_inf_res);
-
- return 0;
-}
-
-/**
- * Get subbuffer num.
- *
- * @param channel Channel name
- * @param pid Traced process ID
- * @return subbuf cnf if successful, or error
- */
-int ustcmd_get_subbuf_num(const char *trace, const char *channel, pid_t pid)
-{
- int num, size, result;
-
- result = ustcmd_get_subbuf_num_size(trace, channel, pid,
- &num, &size);
- if (result < 0) {
- errno = -result;
- return -1;
- }
-
- return num;
-}
-
-/**
- * Get subbuffer size.
- *
- * @param channel Channel name
- * @param pid Traced process ID
- * @return subbuf size if successful, or error
- */
-int ustcmd_get_subbuf_size(const char *trace, const char *channel, pid_t pid)
-{
- int num, size, result;
-
- result = ustcmd_get_subbuf_num_size(trace, channel, pid,
- &num, &size);
- if (result < 0) {
- errno = -result;
- return -1;
- }
-
- return size;
-}
-
-
-static int do_trace_cmd(const char *trace, pid_t pid, int command)
-{
- struct ustcomm_header req_header, res_header;
- struct ustcomm_single_field trace_inf;
- int result;
-
- result = ustcomm_pack_single_field(&req_header,
- &trace_inf,
- trace);
- if (result < 0) {
- errno = -result;
- return -1;
- }
-
- req_header.command = command;
-
- return do_cmd(pid, &req_header, (char *)&trace_inf, &res_header, NULL);
-}
-
-/**
- * Destroys an UST trace according to a PID.
- *
- * @param pid Traced process ID
- * @return 0 if successful, or error USTCMD_ERR_GEN
- */
-int ustcmd_destroy_trace(const char *trace, pid_t pid)
-{
- return do_trace_cmd(trace, pid, DESTROY_TRACE);
-}
-
-/**
- * Starts an UST trace (and setups it) according to a PID.
- *
- * @param pid Traced process ID
- * @return 0 if successful, or error USTCMD_ERR_GEN
- */
-int ustcmd_setup_and_start(const char *trace, pid_t pid)
-{
- return do_trace_cmd(trace, pid, START);
-}
-
-/**
- * Creates an UST trace according to a PID.
- *
- * @param pid Traced process ID
- * @return 0 if successful, or error USTCMD_ERR_GEN
- */
-int ustcmd_create_trace(const char *trace, pid_t pid)
-{
- return do_trace_cmd(trace, pid, CREATE_TRACE);
-}
-
-/**
- * Starts an UST trace according to a PID.
- *
- * @param pid Traced process ID
- * @return 0 if successful, or error USTCMD_ERR_GEN
- */
-int ustcmd_start_trace(const char *trace, pid_t pid)
-{
- return do_trace_cmd(trace, pid, START_TRACE);
-}
-
-/**
- * Alloc an UST trace according to a PID.
- *
- * @param pid Traced process ID
- * @return 0 if successful, or error USTCMD_ERR_GEN
- */
-int ustcmd_alloc_trace(const char *trace, pid_t pid)
-{
- return do_trace_cmd(trace, pid, ALLOC_TRACE);
-}
-
-/**
- * Stops an UST trace according to a PID.
- *
- * @param pid Traced process ID
- * @return 0 if successful, or error USTCMD_ERR_GEN
- */
-int ustcmd_stop_trace(const char *trace, pid_t pid)
-{
- return do_trace_cmd(trace, pid, STOP_TRACE);
-}
-
-/**
- * Counts newlines ('\n') in a string.
- *
- * @param str String to search in
- * @return Total newlines count
- */
-unsigned int ustcmd_count_nl(const char *str)
-{
- unsigned int i = 0, tot = 0;
-
- while (str[i] != '\0') {
- if (str[i] == '\n') {
- ++tot;
- }
- ++i;
- }
-
- return tot;
-}
-
-/**
- * Frees a CMSF array.
- *
- * @param cmsf CMSF array to free
- * @return 0 if successful, or error USTCMD_ERR_ARG
- */
-int ustcmd_free_cmsf(struct marker_status *cmsf)
-{
- if (cmsf == NULL) {
- return USTCMD_ERR_ARG;
- }
-
- unsigned int i = 0;
- while (cmsf[i].channel != NULL) {
- free(cmsf[i].channel);
- free(cmsf[i].marker);
- free(cmsf[i].fs);
- ++i;
- }
- free(cmsf);
-
- return 0;
-}
-
-/**
- * Gets channel/marker/state/format string for a given PID.
- *
- * @param cmsf Pointer to CMSF array to be filled (callee allocates, caller
- * frees with `ustcmd_free_cmsf')
- * @param pid Targeted PID
- * @return 0 if successful, or -1 on error
- */
-int ustcmd_get_cmsf(struct marker_status **cmsf, const pid_t pid)
-{
- struct ustcomm_header req_header, res_header;
- char *big_str = NULL;
- int result, app_fd;
- struct marker_status *tmp_cmsf = NULL;
- unsigned int i = 0, cmsf_ind = 0;
-
- if (cmsf == NULL) {
- return -1;
- }
-
- if (ustcomm_connect_app(pid, &app_fd)) {
- ERR("could not connect to PID %u", (unsigned int) pid);
- return -1;
- }
-
- req_header.command = LIST_MARKERS;
- req_header.size = 0;
-
- result = ustcomm_send(app_fd, &req_header, NULL);
- if (result <= 0) {
- PERROR("error while requesting markers list for process %d", pid);
- return -1;
- }
-
- result = ustcomm_recv_alloc(app_fd, &res_header, &big_str);
- if (result <= 0) {
- ERR("error while receiving markers list");
- return -1;
- }
-
- close(app_fd);
-
- tmp_cmsf = (struct marker_status *) zmalloc(sizeof(struct marker_status) *
- (ustcmd_count_nl(big_str) + 1));
- if (tmp_cmsf == NULL) {
- ERR("Failed to allocate CMSF array");
- return -1;
- }
-
- /* Parse received reply string (format: "[chan]/[mark] [st] [fs]"): */
- while (big_str[i] != '\0') {
- char state;
-
- sscanf(big_str + i, "marker: %a[^/]/%a[^ ] %c %a[^\n]",
- &tmp_cmsf[cmsf_ind].channel,
- &tmp_cmsf[cmsf_ind].marker,
- &state,
- &tmp_cmsf[cmsf_ind].fs);
- tmp_cmsf[cmsf_ind].state = (state == USTCMD_MS_CHR_ON ?
- USTCMD_MS_ON : USTCMD_MS_OFF); /* Marker state */
-
- while (big_str[i] != '\n') {
- ++i; /* Go to next '\n' */
- }
- ++i; /* Skip current pointed '\n' */
- ++cmsf_ind;
- }
- tmp_cmsf[cmsf_ind].channel = NULL;
- tmp_cmsf[cmsf_ind].marker = NULL;
- tmp_cmsf[cmsf_ind].fs = NULL;
-
- *cmsf = tmp_cmsf;
-
- free(big_str);
- return 0;
-}
-
-
-/**
- * Frees a TES array.
- *
- * @param tes TES array to free
- * @return 0 if successful, or error USTCMD_ERR_ARG
- */
-int ustcmd_free_tes(struct trace_event_status *tes)
-{
- if (tes == NULL) {
- return USTCMD_ERR_ARG;
- }
-
- unsigned int i = 0;
- while (tes[i].name != NULL) {
- free(tes[i].name);
- ++i;
- }
- free(tes);
-
- return 0;
-}
-
-/**
- * Gets trace_events string for a given PID.
- *
- * @param tes Pointer to TES array to be filled (callee allocates, caller
- * frees with `ustcmd_free_tes')
- * @param pid Targeted PID
- * @return 0 if successful, or -1 on error
- */
-int ustcmd_get_tes(struct trace_event_status **tes,
- const pid_t pid)
-{
- struct ustcomm_header req_header, res_header;
- char *big_str = NULL;
- int result, app_fd;
- struct trace_event_status *tmp_tes = NULL;
- unsigned int i = 0, tes_ind = 0;
-
- if (tes == NULL) {
- return -1;
- }
-
- if (ustcomm_connect_app(pid, &app_fd)) {
- ERR("could not connect to PID %u", (unsigned int) pid);
- return -1;
- }
-
- req_header.command = LIST_TRACE_EVENTS;
- req_header.size = 0;
-
- result = ustcomm_send(app_fd, &req_header, NULL);
- if (result != 1) {
- ERR("error while requesting trace_event list");
- return -1;
- }
-
- result = ustcomm_recv_alloc(app_fd, &res_header, &big_str);
- if (result != 1) {
- ERR("error while receiving markers list");
- return -1;
- }
-
- close(app_fd);
-
- tmp_tes = (struct trace_event_status *)
- zmalloc(sizeof(struct trace_event_status) *
- (ustcmd_count_nl(big_str) + 1));
- if (tmp_tes == NULL) {
- ERR("Failed to allocate TES array");
- return -1;
- }
-
- /* Parse received reply string (format: "[name]"): */
- while (big_str[i] != '\0') {
- sscanf(big_str + i, "trace_event: %a[^\n]",
- &tmp_tes[tes_ind].name);
- while (big_str[i] != '\n') {
- ++i; /* Go to next '\n' */
- }
- ++i; /* Skip current pointed '\n' */
- ++tes_ind;
- }
- tmp_tes[tes_ind].name = NULL;
-
- *tes = tmp_tes;
-
- free(big_str);
- return 0;
-}
-
-/**
- * Set socket path
- *
- * @param sock_path Socket path
- * @param pid Traced process ID
- * @return 0 if successful, or error
- */
-int ustcmd_set_sock_path(const char *sock_path, pid_t pid)
-{
- int result;
- struct ustcomm_header req_header, res_header;
- struct ustcomm_single_field sock_path_msg;
-
- result = ustcomm_pack_single_field(&req_header,
- &sock_path_msg,
- sock_path);
- if (result < 0) {
- errno = -result;
- return -1;
- }
-
- req_header.command = SET_SOCK_PATH;
-
- return do_cmd(pid, &req_header, (char *)&sock_path_msg,
- &res_header, NULL);
-}
-
-/**
- * Get socket path
- *
- * @param sock_path Pointer to where the socket path will be returned
- * @param pid Traced process ID
- * @return 0 if successful, or error
- */
-int ustcmd_get_sock_path(char **sock_path, pid_t pid)
-{
- int result;
- struct ustcomm_header req_header, res_header;
- struct ustcomm_single_field *sock_path_msg;
-
- req_header.command = GET_SOCK_PATH;
- req_header.size = 0;
-
- result = do_cmd(pid, &req_header, NULL, &res_header,
- (char **)&sock_path_msg);
- if (result < 0) {
- return -1;
- }
-
- result = ustcomm_unpack_single_field(sock_path_msg);
- if (result < 0) {
- return result;
- }
-
- *sock_path = strdup(sock_path_msg->field);
-
- free(sock_path_msg);
-
- return 0;
-}
-
-int ustcmd_force_switch(pid_t pid)
-{
- struct ustcomm_header req_header, res_header;
-
- req_header.command = FORCE_SUBBUF_SWITCH;
- req_header.size = 0;
-
- return do_cmd(pid, &req_header, NULL, &res_header, NULL);
-}
-
projects / lttng-ust.git / commitdiff
