+++ /dev/null
-/*
- * Copyright (C) 2009 Pierre-Marc Fournier, Philippe Proulx-Barrette
- * Copyright (C) 2011 Ericsson AB
- * David Goulet <david.goulet@polymtl.ca>
- *
- * 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 <dirent.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "libustcomm.h"
-#include "libustctl.h"
-#include "lttngerr.h"
-
-/*
- * do_cmd
- *
- * Execute command using ustcomm API.
- */
-static int do_cmd(int sock, const struct ustcomm_header *req_header,
- const char *req_data, struct ustcomm_header *res_header, char **res_data)
-{
- int result, saved_errno = 0;
- char *recv_buf;
-
- recv_buf = malloc(USTCOMM_BUFFER_SIZE);
- if (!recv_buf) {
- saved_errno = ENOMEM;
- goto out;
- }
-
- result = ustcomm_req(sock, 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);
- }
-
-out:
- errno = saved_errno;
- if (errno) {
- return -1;
- }
-
- return 0;
-}
-
-/*
- * realloc_pid_list
- */
-static int realloc_pid_list(pid_t **pid_list, unsigned int *pid_list_size)
-{
- pid_t *new_pid_list;
- unsigned int new_pid_list_size = 2 * (*pid_list_size);
-
- new_pid_list = realloc(*pid_list, new_pid_list_size * sizeof(pid_t));
- if (!*new_pid_list) {
- return -1;
- }
-
- *pid_list = new_pid_list;
- *pid_list_size = new_pid_list_size;
-
- return 0;
-}
-
-/*
- * get_pids_in_dir
- *
- * Set pid_list with all pid in the dir.
- */
-static int get_pids_in_dir(DIR *dir, pid_t **pid_list,
- unsigned int *pid_list_index, unsigned int *pid_list_size)
-{
- struct dirent *dirent;
- pid_t read_pid;
-
- while ((dirent = readdir(dir))) {
- if (!strcmp(dirent->d_name, ".") ||
- !strcmp(dirent->d_name, "..") ||
- !strcmp(dirent->d_name, "ust-consumer") ||
- dirent->d_type == DT_DIR) {
- continue;
- }
-
- if (ustcomm_is_socket_live(dirent->d_name, &read_pid)) {
- (*pid_list)[(*pid_list_index)++] = (long) read_pid;
- if (*pid_list_index == *pid_list_size) {
- if (realloc_pid_list(pid_list, pid_list_size)) {
- return -1;
- }
- }
- }
- }
-
- (*pid_list)[*pid_list_index] = 0; /* Array end */
-
- return 0;
-}
-
-/*
- * get_pids_non_root
- */
-static pid_t *get_pids_non_root(void)
-{
- char *dir_name;
- DIR *dir;
- unsigned int pid_list_index = 0, pid_list_size = 1;
- pid_t *pid_list = NULL;
-
- dir_name = ustcomm_user_sock_dir();
- if (!dir_name) {
- return NULL;
- }
-
- dir = opendir(dir_name);
- if (!dir) {
- goto free_dir_name;
- }
-
- pid_list = malloc(pid_list_size * sizeof(pid_t));
- if (!pid_list) {
- goto close_dir;
- }
-
- if (get_pids_in_dir(dir, &pid_list, &pid_list_index, &pid_list_size)) {
- /* if any errors are encountered, force freeing of the list */
- pid_list[0] = 0;
- }
-
-close_dir:
- closedir(dir);
-
-free_dir_name:
- free(dir_name);
-
- return pid_list;
-}
-
-/*
- * get_pids_root
- */
-static pid_t *get_pids_root(void)
-{
- char *dir_name;
- DIR *tmp_dir, *dir;
- unsigned int pid_list_index = 0, pid_list_size = 1;
- pid_t *pid_list = NULL;
- struct dirent *dirent;
- int result;
-
- tmp_dir = opendir(USER_TMP_DIR);
- if (!tmp_dir) {
- return NULL;
- }
-
- pid_list = malloc(pid_list_size * sizeof(pid_t));
- if (!pid_list) {
- goto close_tmp_dir;
- }
-
- while ((dirent = readdir(tmp_dir))) {
- /* Compare the dir to check for the USER_SOCK_DIR_BASE prefix */
- if (!strncmp(dirent->d_name, USER_SOCK_DIR_BASE,
- strlen(USER_SOCK_DIR_BASE))) {
- if (asprintf(&dir_name, USER_TMP_DIR "/%s", dirent->d_name) < 0) {
- goto close_tmp_dir;
- }
-
- dir = opendir(dir_name);
- free(dir_name);
- if (!dir) {
- continue;
- }
-
- result = get_pids_in_dir(dir, &pid_list, &pid_list_index, &pid_list_size);
- closedir(dir);
- if (result) {
- /*
- * if any errors are encountered,
- * force freeing of the list
- */
- pid_list[0] = 0;
- break;
- }
- }
- }
-
-close_tmp_dir:
- closedir(tmp_dir);
- return pid_list;
-}
-
-/*
- * ustctl_get_subbuf_num_size
- */
-static int ustctl_get_subbuf_num_size(int sock, const char *trace,
- const char *channel, 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(sock, &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;
-}
-
-/*
- * do_trace_cmd
- *
- * Do all trace action command
- */
-static int do_trace_cmd(int sock, const char *trace, 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(sock, &req_header, (char *)&trace_inf, &res_header, NULL);
-}
-
-/*
- * ustctl_connect_pid
- *
- * Connect to PID
- */
-int ustctl_connect_pid(pid_t pid)
-{
- int sock;
-
- if (ustcomm_connect_app(pid, &sock)) {
- ERR("could not connect to PID %u", (unsigned int) pid);
- errno = ENOTCONN;
- return -1;
- }
-
- return sock;
-}
-
-/*
- * ustctl_get_online_pids
- *
- * Return list of online pids.
- */
-pid_t *ustctl_get_online_pids(void)
-{
- pid_t *pid_list;
-
- if (geteuid()) {
- pid_list = get_pids_non_root();
- } else {
- pid_list = get_pids_root();
- }
-
- if (pid_list && pid_list[0] == 0) {
- /* No PID at all */
- free(pid_list);
- pid_list = NULL;
- }
-
- return pid_list;
-}
-
-/*
- * Sets ust_marker state (USTCTL_MS_ON or USTCTL_MS_OFF).
- *
- * @param mn Marker name
- * @param state Marker's new state
- * @param pid Traced process ID
- * @return 0 if successful, or errors {USTCTL_ERR_GEN, USTCTL_ERR_ARG}
- */
-int ustctl_set_marker_state(int sock, const char *trace, const char *channel,
- const char *ust_marker, int state)
-{
- struct ustcomm_header req_header, res_header;
- struct ustcomm_ust_marker_info ust_marker_inf;
- int result;
-
- result = ustcomm_pack_ust_marker_info(&req_header, &ust_marker_inf,
- trace, channel, ust_marker);
- if (result < 0) {
- errno = -result;
- return -1;
- }
-
- req_header.command = state ? ENABLE_MARKER : DISABLE_MARKER;
-
- return do_cmd(sock, &req_header, (char *)&ust_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 ustctl_set_subbuf_size(int sock, const char *trace, const char *channel,
- unsigned int subbuf_size)
-{
- 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(sock, &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 ustctl_set_subbuf_num(int sock, const char *trace, const char *channel,
- unsigned int num)
-{
- 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(sock, &req_header, (char *)&ch_inf, &res_header, NULL);
-
-}
-
-/*
- * Get subbuffer num.
- *
- * @param channel Channel name
- * @param pid Traced process ID
- * @return subbuf cnf if successful, or error
- */
-int ustctl_get_subbuf_num(int sock, const char *trace, const char *channel)
-{
- int num, size, result;
-
- result = ustctl_get_subbuf_num_size(sock, trace, channel, &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 ustctl_get_subbuf_size(int sock, const char *trace, const char *channel)
-{
- int num, size, result;
-
- result = ustctl_get_subbuf_num_size(sock, trace, channel, &num, &size);
- if (result < 0) {
- errno = -result;
- return -1;
- }
-
- return size;
-}
-
-/*
- * Destroys an UST trace according to a PID.
- *
- * @param pid Traced process ID
- * @return 0 if successful, or error USTCTL_ERR_GEN
- */
-int ustctl_destroy_trace(int sock, const char *trace)
-{
- return do_trace_cmd(sock, trace, DESTROY_TRACE);
-}
-
-/*
- * Starts an UST trace (and setups it) according to a PID.
- *
- * @param pid Traced process ID
- * @return 0 if successful, or error USTCTL_ERR_GEN
- */
-int ustctl_setup_and_start(int sock, const char *trace)
-{
- return do_trace_cmd(sock, trace, START);
-}
-
-/*
- * Creates an UST trace according to a PID.
- *
- * @param pid Traced process ID
- * @return 0 if successful, or error USTCTL_ERR_GEN
- */
-int ustctl_create_trace(int sock, const char *trace)
-{
- return do_trace_cmd(sock, trace, CREATE_TRACE);
-}
-
-/*
- * Starts an UST trace according to a PID.
- *
- * @param pid Traced process ID
- * @return 0 if successful, or error USTCTL_ERR_GEN
- */
-int ustctl_start_trace(int sock, const char *trace)
-{
- return do_trace_cmd(sock, trace, START_TRACE);
-}
-
-/*
- * Alloc an UST trace according to a PID.
- *
- * @param pid Traced process ID
- * @return 0 if successful, or error USTCTL_ERR_GEN
- */
-int ustctl_alloc_trace(int sock, const char *trace)
-{
- return do_trace_cmd(sock, trace, ALLOC_TRACE);
-}
-
-/*
- * ustctl_force_switch
- *
- * Force switch buffer in libust
- */
-int ustctl_force_switch(int sock, const char *trace)
-{
- return do_trace_cmd(sock, trace, FORCE_SUBBUF_SWITCH);
-}
-
-/*
- * Stops an UST trace according to a PID.
- *
- * @param pid Traced process ID
- * @return 0 if successful, or error USTCTL_ERR_GEN
- */
-int ustctl_stop_trace(int sock, const char *trace)
-{
- return do_trace_cmd(sock, trace, STOP_TRACE);
-}
-
-/*
- * Counts newlines ('\n') in a string.
- *
- * @param str String to search in
- * @return Total newlines count
- */
-unsigned int ustctl_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 USTCTL_ERR_ARG
- */
-int ustctl_free_cmsf(struct ustctl_marker_status *cmsf)
-{
- if (cmsf == NULL) {
- return -1;
- }
-
- unsigned int i = 0;
- while (cmsf[i].channel != NULL) {
- free(cmsf[i].channel);
- free(cmsf[i].ust_marker);
- free(cmsf[i].fs);
- ++i;
- }
- free(cmsf);
-
- return 0;
-}
-
-/*
- * Gets channel/ust_marker/state/format string for a given PID.
- *
- * @param cmsf Pointer to CMSF array to be filled (callee allocates, caller
- * frees with `ustctl_free_cmsf')
- * @param pid Targeted PID
- * @return 0 if successful, or -1 on error
- */
-int ustctl_get_cmsf(int sock, struct ustctl_marker_status **cmsf)
-{
- struct ustcomm_header req_header, res_header;
- char *big_str = NULL;
- int result;
- struct ustctl_marker_status *tmp_cmsf = NULL;
- unsigned int i = 0, cmsf_ind = 0;
-
- if (cmsf == NULL) {
- return -1;
- }
-
- req_header.command = LIST_MARKERS;
- req_header.size = 0;
-
- result = ustcomm_send(sock, &req_header, NULL);
- if (result <= 0) {
- ERR("error while requesting ust_marker list");
- return -1;
- }
-
- result = ustcomm_recv_alloc(sock, &res_header, &big_str);
- if (result <= 0) {
- ERR("error while receiving ust_marker list");
- return -1;
- }
-
- tmp_cmsf = (struct ustctl_marker_status *) malloc(sizeof(struct ustctl_marker_status) *
- (ustctl_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, "ust_marker: %a[^/]/%a[^ ] %c %a[^\n]",
- &tmp_cmsf[cmsf_ind].channel,
- &tmp_cmsf[cmsf_ind].ust_marker,
- &state,
- &tmp_cmsf[cmsf_ind].fs);
- tmp_cmsf[cmsf_ind].state = (state == USTCTL_MS_CHR_ON ?
- USTCTL_MS_ON : USTCTL_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].ust_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 USTCTL_ERR_ARG
- */
-int ustctl_free_tes(struct ustctl_trace_event_status *tes)
-{
- if (tes == NULL) {
- return USTCTL_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 `ustctl_free_tes')
- * @param pid Targeted PID
- * @return 0 if successful, or -1 on error
- */
-int ustctl_get_tes(int sock, struct ustctl_trace_event_status **tes)
-{
- struct ustcomm_header req_header, res_header;
- char *big_str = NULL;
- int result;
- struct ustctl_trace_event_status *tmp_tes = NULL;
- unsigned int i = 0, tes_ind = 0;
-
- if (tes == NULL) {
- return -1;
- }
-
- req_header.command = LIST_TRACE_EVENTS;
- req_header.size = 0;
-
- result = ustcomm_send(sock, &req_header, NULL);
- if (result != 1) {
- ERR("error while requesting trace_event list");
- return -1;
- }
-
- result = ustcomm_recv_alloc(sock, &res_header, &big_str);
- if (result != 1) {
- ERR("error while receiving ust_marker list");
- return -1;
- }
-
- tmp_tes = (struct ustctl_trace_event_status *)
- malloc(sizeof(struct ustctl_trace_event_status) *
- (ustctl_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 sock path
- *
- * @param sock_path Sock path
- * @param pid Traced process ID
- * @return 0 if successful, or error
- */
-int ustctl_set_sock_path(int sock, const char *sock_path)
-{
- 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(sock, &req_header, (char *)&sock_path_msg, &res_header, NULL);
-}
-
-/*
- * Get sock path
- *
- * @param sock_path Pointer to where the sock path will be returned
- * @param pid Traced process ID
- * @return 0 if successful, or error
- */
-int ustctl_get_sock_path(int sock, char **sock_path)
-{
- 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(sock, &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;
-}
projects / lttng-tools.git / blobdiff