--- /dev/null
+/*
+ * liblttngctl.c
+ *
+ * Linux Trace Toolkit Control Library
+ *
+ * Copyright (C) 2011 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; only
+ * version 2.1 of the License.
+ *
+ * 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 <grp.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <common/sessiond-comm/sessiond-comm.h>
+#include <common/lttng-share.h>
+#include <common/lttngerr.h>
+#include <lttng/lttng.h>
+
+/* Socket to session daemon for communication */
+static int sessiond_socket;
+static char sessiond_sock_path[PATH_MAX];
+
+/* Variables */
+static char *tracing_group;
+static int connected;
+
+/*
+ * Copy string from src to dst and enforce null terminated byte.
+ */
+static void copy_string(char *dst, const char *src, size_t len)
+{
+ if (src && dst) {
+ strncpy(dst, src, len);
+ /* Enforce the NULL terminated byte */
+ dst[len - 1] = '\0';
+ } else if (dst) {
+ dst[0] = '\0';
+ }
+}
+
+/*
+ * Copy domain to lttcomm_session_msg domain.
+ *
+ * If domain is unknown, default domain will be the kernel.
+ */
+static void copy_lttng_domain(struct lttng_domain *dst, struct lttng_domain *src)
+{
+ if (src && dst) {
+ switch (src->type) {
+ case LTTNG_DOMAIN_KERNEL:
+ case LTTNG_DOMAIN_UST:
+ case LTTNG_DOMAIN_UST_EXEC_NAME:
+ case LTTNG_DOMAIN_UST_PID:
+ case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+ memcpy(dst, src, sizeof(struct lttng_domain));
+ break;
+ default:
+ dst->type = LTTNG_DOMAIN_KERNEL;
+ break;
+ }
+ }
+}
+
+/*
+ * Send lttcomm_session_msg to the session daemon.
+ *
+ * On success, return 0
+ * On error, return error code
+ */
+static int send_session_msg(struct lttcomm_session_msg *lsm)
+{
+ int ret;
+
+ if (!connected) {
+ ret = -ENOTCONN;
+ goto end;
+ }
+
+ ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
+ sizeof(struct lttcomm_session_msg));
+
+end:
+ return ret;
+}
+
+/*
+ * Receive data from the sessiond socket.
+ *
+ * On success, return 0
+ * On error, return recv() error code
+ */
+static int recv_data_sessiond(void *buf, size_t len)
+{
+ int ret;
+
+ if (!connected) {
+ ret = -ENOTCONN;
+ goto end;
+ }
+
+ ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
+
+end:
+ return ret;
+}
+
+/*
+ * Check if the specified group name exist.
+ *
+ * If yes return 1, else return -1.
+ */
+static int check_tracing_group(const char *grp_name)
+{
+ struct group *grp_tracing; /* no free(). See getgrnam(3) */
+ gid_t *grp_list;
+ int grp_list_size, grp_id, i;
+ int ret = -1;
+
+ /* Get GID of group 'tracing' */
+ grp_tracing = getgrnam(grp_name);
+ if (grp_tracing == NULL) {
+ /* NULL means not found also. getgrnam(3) */
+ if (errno != 0) {
+ perror("getgrnam");
+ }
+ goto end;
+ }
+
+ /* Get number of supplementary group IDs */
+ grp_list_size = getgroups(0, NULL);
+ if (grp_list_size < 0) {
+ perror("getgroups");
+ goto end;
+ }
+
+ /* Alloc group list of the right size */
+ grp_list = malloc(grp_list_size * sizeof(gid_t));
+ if (!grp_list) {
+ ret = -1;
+ goto end;
+ }
+ grp_id = getgroups(grp_list_size, grp_list);
+ if (grp_id < -1) {
+ perror("getgroups");
+ goto free_list;
+ }
+
+ for (i = 0; i < grp_list_size; i++) {
+ if (grp_list[i] == grp_tracing->gr_gid) {
+ ret = 1;
+ break;
+ }
+ }
+
+free_list:
+ free(grp_list);
+
+end:
+ return ret;
+}
+
+/*
+ * Try connect to session daemon with sock_path.
+ *
+ * Return 0 on success, else -1
+ */
+static int try_connect_sessiond(const char *sock_path)
+{
+ int ret;
+
+ /* If socket exist, we check if the daemon listens for connect. */
+ ret = access(sock_path, F_OK);
+ if (ret < 0) {
+ /* Not alive */
+ return -1;
+ }
+
+ ret = lttcomm_connect_unix_sock(sock_path);
+ if (ret < 0) {
+ /* Not alive */
+ return -1;
+ }
+
+ ret = lttcomm_close_unix_sock(ret);
+ if (ret < 0) {
+ perror("lttcomm_close_unix_sock");
+ }
+
+ return 0;
+}
+
+/*
+ * Set sessiond socket path by putting it in the global sessiond_sock_path
+ * variable.
+ */
+static int set_session_daemon_path(void)
+{
+ int ret;
+ int in_tgroup = 0; /* In tracing group */
+ uid_t uid;
+
+ uid = getuid();
+
+ if (uid != 0) {
+ /* Are we in the tracing group ? */
+ in_tgroup = check_tracing_group(tracing_group);
+ }
+
+ if (uid == 0) {
+ /* Root */
+ copy_string(sessiond_sock_path,
+ DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
+ sizeof(sessiond_sock_path));
+ } else if (in_tgroup) {
+ /* Tracing group */
+ copy_string(sessiond_sock_path,
+ DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
+ sizeof(sessiond_sock_path));
+
+ ret = try_connect_sessiond(sessiond_sock_path);
+ if (ret < 0) {
+ /* Global session daemon not available */
+ if (snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
+ DEFAULT_HOME_CLIENT_UNIX_SOCK,
+ getenv("HOME")) < 0) {
+ return -ENOMEM;
+ }
+ }
+ } else {
+ /* Not in tracing group and not root, default */
+ if (snprintf(sessiond_sock_path, PATH_MAX,
+ DEFAULT_HOME_CLIENT_UNIX_SOCK,
+ getenv("HOME")) < 0) {
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Connect to the LTTng session daemon.
+ *
+ * On success, return 0. On error, return -1.
+ */
+static int connect_sessiond(void)
+{
+ int ret;
+
+ ret = set_session_daemon_path();
+ if (ret < 0) {
+ return ret;
+ }
+
+ /* Connect to the sesssion daemon */
+ ret = lttcomm_connect_unix_sock(sessiond_sock_path);
+ if (ret < 0) {
+ return ret;
+ }
+
+ sessiond_socket = ret;
+ connected = 1;
+
+ return 0;
+}
+
+/*
+ * Clean disconnect the session daemon.
+ */
+static int disconnect_sessiond(void)
+{
+ int ret = 0;
+
+ if (connected) {
+ ret = lttcomm_close_unix_sock(sessiond_socket);
+ sessiond_socket = 0;
+ connected = 0;
+ }
+
+ return ret;
+}
+
+/*
+ * Ask the session daemon a specific command and put the data into buf.
+ *
+ * Return size of data (only payload, not header).
+ */
+static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
+{
+ int ret;
+ size_t size;
+ void *data = NULL;
+ struct lttcomm_lttng_msg llm;
+
+ ret = connect_sessiond();
+ if (ret < 0) {
+ goto end;
+ }
+
+ /* Send command to session daemon */
+ ret = send_session_msg(lsm);
+ if (ret < 0) {
+ goto end;
+ }
+
+ /* Get header from data transmission */
+ ret = recv_data_sessiond(&llm, sizeof(llm));
+ if (ret < 0) {
+ goto end;
+ }
+
+ /* Check error code if OK */
+ if (llm.ret_code != LTTCOMM_OK) {
+ ret = -llm.ret_code;
+ goto end;
+ }
+
+ size = llm.data_size;
+ if (size == 0) {
+ /* If client free with size 0 */
+ if (buf != NULL) {
+ *buf = NULL;
+ }
+ ret = 0;
+ goto end;
+ }
+
+ data = (void*) malloc(size);
+
+ /* Get payload data */
+ ret = recv_data_sessiond(data, size);
+ if (ret < 0) {
+ free(data);
+ goto end;
+ }
+
+ /*
+ * Extra protection not to dereference a NULL pointer. If buf is NULL at
+ * this point, an error is returned and data is freed.
+ */
+ if (buf == NULL) {
+ ret = -1;
+ free(data);
+ goto end;
+ }
+
+ *buf = data;
+ ret = size;
+
+end:
+ disconnect_sessiond();
+ return ret;
+}
+
+/*
+ * Create lttng handle and return pointer.
+ */
+struct lttng_handle *lttng_create_handle(const char *session_name,
+ struct lttng_domain *domain)
+{
+ struct lttng_handle *handle;
+
+ handle = malloc(sizeof(struct lttng_handle));
+ if (handle == NULL) {
+ perror("malloc handle");
+ goto end;
+ }
+
+ /* Copy session name */
+ copy_string(handle->session_name, session_name,
+ sizeof(handle->session_name));
+
+ /* Copy lttng domain */
+ copy_lttng_domain(&handle->domain, domain);
+
+end:
+ return handle;
+}
+
+/*
+ * Destroy handle by free(3) the pointer.
+ */
+void lttng_destroy_handle(struct lttng_handle *handle)
+{
+ if (handle) {
+ free(handle);
+ }
+}
+
+/*
+ * Register an outside consumer.
+ */
+int lttng_register_consumer(struct lttng_handle *handle,
+ const char *socket_path)
+{
+ struct lttcomm_session_msg lsm;
+
+ lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * Start tracing for all trace of the session.
+ */
+int lttng_start_tracing(const char *session_name)
+{
+ struct lttcomm_session_msg lsm;
+
+ if (session_name == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_START_TRACE;
+
+ copy_string(lsm.session.name, session_name, sizeof(lsm.session.name));
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * Stop tracing for all trace of the session.
+ */
+int lttng_stop_tracing(const char *session_name)
+{
+ struct lttcomm_session_msg lsm;
+
+ if (session_name == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_STOP_TRACE;
+
+ copy_string(lsm.session.name, session_name, sizeof(lsm.session.name));
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * Add context to event or/and channel.
+ */
+int lttng_add_context(struct lttng_handle *handle,
+ struct lttng_event_context *ctx, const char *event_name,
+ const char *channel_name)
+{
+ struct lttcomm_session_msg lsm;
+
+ /* Safety check. Both are mandatory */
+ if (handle == NULL || ctx == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_ADD_CONTEXT;
+
+ /* Copy channel name */
+ copy_string(lsm.u.context.channel_name, channel_name,
+ sizeof(lsm.u.context.channel_name));
+ /* Copy event name */
+ copy_string(lsm.u.context.event_name, event_name,
+ sizeof(lsm.u.context.event_name));
+
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
+
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * Enable event
+ */
+int lttng_enable_event(struct lttng_handle *handle,
+ struct lttng_event *ev, const char *channel_name)
+{
+ struct lttcomm_session_msg lsm;
+
+ if (handle == NULL || ev == NULL) {
+ return -1;
+ }
+
+ /* If no channel name, we put the default name */
+ if (channel_name == NULL) {
+ copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME,
+ sizeof(lsm.u.enable.channel_name));
+ } else {
+ copy_string(lsm.u.enable.channel_name, channel_name,
+ sizeof(lsm.u.enable.channel_name));
+ }
+
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ if (ev->name[0] != '\0') {
+ lsm.cmd_type = LTTNG_ENABLE_EVENT;
+ } else {
+ lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
+ }
+ memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
+
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * Disable event of a channel and domain.
+ */
+int lttng_disable_event(struct lttng_handle *handle, const char *name,
+ const char *channel_name)
+{
+ struct lttcomm_session_msg lsm;
+
+ if (handle == NULL) {
+ return -1;
+ }
+
+ if (channel_name) {
+ copy_string(lsm.u.disable.channel_name, channel_name,
+ sizeof(lsm.u.disable.channel_name));
+ } else {
+ copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME,
+ sizeof(lsm.u.disable.channel_name));
+ }
+
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ if (name != NULL) {
+ copy_string(lsm.u.disable.name, name, sizeof(lsm.u.disable.name));
+ lsm.cmd_type = LTTNG_DISABLE_EVENT;
+ } else {
+ lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
+ }
+
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * Enable channel per domain
+ */
+int lttng_enable_channel(struct lttng_handle *handle,
+ struct lttng_channel *chan)
+{
+ struct lttcomm_session_msg lsm;
+
+ /*
+ * NULL arguments are forbidden. No default values.
+ */
+ if (handle == NULL || chan == NULL) {
+ return -1;
+ }
+
+ memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
+
+ lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
+
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * All tracing will be stopped for registered events of the channel.
+ */
+int lttng_disable_channel(struct lttng_handle *handle, const char *name)
+{
+ struct lttcomm_session_msg lsm;
+
+ /* Safety check. Both are mandatory */
+ if (handle == NULL || name == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
+
+ copy_string(lsm.u.disable.channel_name, name,
+ sizeof(lsm.u.disable.channel_name));
+
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * List all available tracepoints of domain.
+ *
+ * Return the size (bytes) of the list and set the events array.
+ * On error, return negative value.
+ */
+int lttng_list_tracepoints(struct lttng_handle *handle,
+ struct lttng_event **events)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ if (handle == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ ret = ask_sessiond(&lsm, (void **) events);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return ret / sizeof(struct lttng_event);
+}
+
+/*
+ * Return a human readable string of code
+ */
+const char *lttng_strerror(int code)
+{
+ if (code > -LTTCOMM_OK) {
+ return "Ended with errors";
+ }
+
+ return lttcomm_get_readable_code(code);
+}
+
+/*
+ * Create a brand new session using name.
+ */
+int lttng_create_session(const char *name, const char *path)
+{
+ struct lttcomm_session_msg lsm;
+
+ lsm.cmd_type = LTTNG_CREATE_SESSION;
+ copy_string(lsm.session.name, name, sizeof(lsm.session.name));
+ copy_string(lsm.session.path, path, sizeof(lsm.session.path));
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * Destroy session using name.
+ */
+int lttng_destroy_session(const char *session_name)
+{
+ struct lttcomm_session_msg lsm;
+
+ if (session_name == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_DESTROY_SESSION;
+
+ copy_string(lsm.session.name, session_name, sizeof(lsm.session.name));
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * Ask the session daemon for all available sessions.
+ *
+ * Return number of session.
+ * On error, return negative value.
+ */
+int lttng_list_sessions(struct lttng_session **sessions)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ lsm.cmd_type = LTTNG_LIST_SESSIONS;
+ ret = ask_sessiond(&lsm, (void**) sessions);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return ret / sizeof(struct lttng_session);
+}
+
+/*
+ * List domain of a session.
+ */
+int lttng_list_domains(const char *session_name,
+ struct lttng_domain **domains)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ if (session_name == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_LIST_DOMAINS;
+
+ copy_string(lsm.session.name, session_name, sizeof(lsm.session.name));
+
+ ret = ask_sessiond(&lsm, (void**) domains);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return ret / sizeof(struct lttng_domain);
+}
+
+/*
+ * List channels of a session
+ */
+int lttng_list_channels(struct lttng_handle *handle,
+ struct lttng_channel **channels)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ if (handle == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_LIST_CHANNELS;
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ ret = ask_sessiond(&lsm, (void**) channels);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return ret / sizeof(struct lttng_channel);
+}
+
+/*
+ * List events of a session channel.
+ */
+int lttng_list_events(struct lttng_handle *handle,
+ const char *channel_name, struct lttng_event **events)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ /* Safety check. An handle and channel name are mandatory */
+ if (handle == NULL || channel_name == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_LIST_EVENTS;
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ copy_string(lsm.u.list.channel_name, channel_name,
+ sizeof(lsm.u.list.channel_name));
+
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ ret = ask_sessiond(&lsm, (void**) events);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return ret / sizeof(struct lttng_event);
+}
+
+/*
+ * Set tracing group variable with name. This function allocate memory pointed
+ * by tracing_group.
+ */
+int lttng_set_tracing_group(const char *name)
+{
+ if (name == NULL) {
+ return -1;
+ }
+
+ if (asprintf(&tracing_group, "%s", name) < 0) {
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+/*
+ * lttng_calibrate
+ */
+int lttng_calibrate(struct lttng_handle *handle,
+ struct lttng_calibrate *calibrate)
+{
+ struct lttcomm_session_msg lsm;
+
+ /* Safety check. NULL pointer are forbidden */
+ if (handle == NULL || calibrate == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_CALIBRATE;
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * Set default channel attributes.
+ */
+void lttng_channel_set_default_attr(struct lttng_domain *domain,
+ struct lttng_channel_attr *attr)
+{
+ /* Safety check */
+ if (attr == NULL || domain == NULL) {
+ return;
+ }
+
+ switch (domain->type) {
+ case LTTNG_DOMAIN_KERNEL:
+ attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
+ attr->switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
+ attr->read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
+
+ attr->subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE;
+ attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
+ attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
+ break;
+ case LTTNG_DOMAIN_UST:
+ case LTTNG_DOMAIN_UST_EXEC_NAME:
+ case LTTNG_DOMAIN_UST_PID:
+ case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+ attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
+ attr->switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
+ attr->read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
+
+ attr->subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE;
+ attr->num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM;
+ attr->output = DEFAULT_UST_CHANNEL_OUTPUT;
+ break;
+ default:
+ /* Default behavior */
+ memset(attr, 0, sizeof(struct lttng_channel_attr));
+ break;
+ }
+}
+
+/*
+ * Check if session daemon is alive.
+ *
+ * Return 1 if alive or 0 if not.
+ * On error return -1
+ */
+int lttng_session_daemon_alive(void)
+{
+ int ret;
+
+ ret = set_session_daemon_path();
+ if (ret < 0) {
+ /* Error */
+ return ret;
+ }
+
+ if (strlen(sessiond_sock_path) == 0) {
+ /* No socket path set. Weird error */
+ return -1;
+ }
+
+ ret = try_connect_sessiond(sessiond_sock_path);
+ if (ret < 0) {
+ /* Not alive */
+ return 0;
+ }
+
+ /* Is alive */
+ return 1;
+}
+
+/*
+ * lib constructor
+ */
+static void __attribute__((constructor)) init()
+{
+ /* Set default session group */
+ lttng_set_tracing_group(LTTNG_DEFAULT_TRACING_GROUP);
+}
projects / lttng-tools.git / blobdiff