* Linux Trace Toolkit Control Library
*
* Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License, version 2.1 only,
}
/*
- * Check if we are in the specified group.
+ * Check if we are in the specified group.
*
- * If yes return 1, else return -1.
+ * If yes return 1, else return -1.
*/
LTTNG_HIDDEN
int lttng_check_tracing_group(void)
ret = lttcomm_connect_unix_sock(sock_path);
if (ret < 0) {
- /* Not alive */
+ /* Not alive. */
goto error;
}
*/
static int set_session_daemon_path(void)
{
- int in_tgroup = 0; /* In tracing group */
+ int in_tgroup = 0; /* In tracing group. */
uid_t uid;
uid = getuid();
int ret;
if (in_tgroup) {
- /* Tracing group */
+ /* Tracing group. */
ret = try_connect_sessiond(sessiond_sock_path);
if (ret >= 0) {
goto end;
/* ...or not in tracing group (and not root), default */
/*
- * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
- * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
+ * With GNU C < 2.1, snprintf returns -1 if the target buffer
+ * is too small;
+ * With GNU C >= 2.1, snprintf returns the required size
+ * (excluding closing null)
*/
ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
}
/*
- * Connect to the LTTng session daemon.
+ * Connect to the LTTng session daemon.
*
- * On success, return 0. On error, return -1.
+ * On success, return 0. On error, return -1.
*/
static int connect_sessiond(void)
{
goto error;
}
- /* Connect to the sesssion daemon */
+ /* Connect to the sesssion daemon. */
ret = lttcomm_connect_unix_sock(sessiond_sock_path);
if (ret < 0) {
goto error;
/*
* Clean disconnect from the session daemon.
+ *
* On success, return 0. On error, return -1.
*/
static int disconnect_sessiond(void)
/*
* Create lttng handle and return pointer.
+ *
* The returned pointer will be NULL in case of malloc() error.
*/
struct lttng_handle *lttng_create_handle(const char *session_name,
/*
* Register an outside consumer.
+ *
* Returns size of returned session payload data or a negative error code.
*/
int lttng_register_consumer(struct lttng_handle *handle,
sizeof(lsm.session.name));
lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
- lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
+ lttng_ctl_copy_string(lsm.u.reg.path, socket_path,
+ sizeof(lsm.u.reg.path));
return lttng_ctl_ask_sessiond(&lsm, NULL);
}
/*
- * Start tracing for all traces of the session.
- * Returns size of returned session payload data or a negative error code.
+ * Start tracing for all traces of the session.
+ *
+ * Returns size of returned session payload data or a negative error code.
*/
int lttng_start_tracing(const char *session_name)
{
}
/*
- * Data sleep time before retrying (in usec). Don't sleep if the call
- * returned value indicates availability.
+ * Data sleep time before retrying (in usec). Don't sleep if the
+ * call returned value indicates availability.
*/
if (data_ret) {
usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
struct lttng_event_context *ctx, const char *event_name,
const char *channel_name)
{
+ int ret;
+ size_t len = 0;
+ char *buf = NULL;
struct lttcomm_session_msg lsm;
- /* Safety check. Both are mandatory */
+ /* Safety check. Both are mandatory. */
if (handle == NULL || ctx == NULL) {
- return -LTTNG_ERR_INVALID;
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
memset(&lsm, 0, sizeof(lsm));
-
lsm.cmd_type = LTTNG_ADD_CONTEXT;
/* If no channel name, send empty string. */
}
lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
-
- memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
-
lttng_ctl_copy_string(lsm.session.name, handle->session_name,
sizeof(lsm.session.name));
- return lttng_ctl_ask_sessiond(&lsm, NULL);
+ if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
+ size_t provider_len, ctx_len;
+ const char *provider_name = ctx->u.app_ctx.provider_name;
+ const char *ctx_name = ctx->u.app_ctx.ctx_name;
+
+ if (!provider_name || !ctx_name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ provider_len = strlen(provider_name);
+ if (provider_len == 0) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ lsm.u.context.provider_name_len = provider_len;
+
+ ctx_len = strlen(ctx_name);
+ if (ctx_len == 0) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ lsm.u.context.context_name_len = ctx_len;
+
+ len = provider_len + ctx_len;
+ buf = zmalloc(len);
+ if (!buf) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ memcpy(buf, provider_name, provider_len);
+ memcpy(buf + provider_len, ctx_name, ctx_len);
+ }
+ memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
+ /* Don't leak application addresses to the sessiond. */
+ lsm.u.context.ctx.u.app_ctx.provider_name = NULL;
+ lsm.u.context.ctx.u.app_ctx.ctx_name = NULL;
+
+ ret = lttng_ctl_ask_sessiond_varlen(&lsm, buf, len, NULL);
+end:
+ free(buf);
+ return ret;
}
/*
- * Enable event(s) for a channel.
- * If no event name is specified, all events are enabled.
- * If no channel name is specified, the default 'channel0' is used.
- * Returns size of returned session payload data or a negative error code.
+ * Enable event(s) for a channel.
+ *
+ * If no event name is specified, all events are enabled.
+ * If no channel name is specified, the default 'channel0' is used.
+ *
+ * Returns size of returned session payload data or a negative error code.
*/
int lttng_enable_event(struct lttng_handle *handle,
struct lttng_event *ev, const char *channel_name)
ret = -LTTNG_ERR_FILTER_INVAL;
goto parse_error;
}
- /* Validate strings used as literals in the expression */
+ /* Validate strings used as literals in the expression. */
ret = filter_visitor_ir_validate_string(ctx);
if (ret) {
ret = -LTTNG_ERR_FILTER_INVAL;
goto error;
}
- /* Empty filter string will always be rejected by the parser
+ /*
+ * Empty filter string will always be rejected by the parser
* anyway, so treat this corner-case early to eliminate
* lttng_fmemopen error for 0-byte allocation.
*/
/*
* We have either a filter or some exclusions, so we need to set up
- * a variable-length memory block from where to send the data
+ * a variable-length memory block from where to send the data.
*/
- /* Parse filter expression */
+ /* Parse filter expression. */
if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
|| handle->domain.type == LTTNG_DOMAIN_LOG4J
|| handle->domain.type == LTTNG_DOMAIN_PYTHON) {
agent_filter = set_agent_filter(filter_expression, ev);
if (!agent_filter) {
if (!filter_expression) {
- /* No JUL and no filter, just skip everything below. */
+ /*
+ * No JUL and no filter, just skip
+ * everything below.
+ */
goto ask_sessiond;
}
} else {
/*
- * With an agent filter, the original filter has been added to
- * it thus replace the filter expression.
+ * With an agent filter, the original filter has
+ * been added to it thus replace the filter
+ * expression.
*/
filter_expression = agent_filter;
free_filter_expression = 1;
goto mem_error;
}
- /* Put exclusion names first in the data */
+ /* Put exclusion names first in the data. */
while (exclusion_count--) {
strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count,
*(exclusion_list + exclusion_count),
LTTNG_SYMBOL_NAME_LEN - 1);
}
- /* Add filter expression next */
+ /* Add filter expression next. */
if (lsm.u.enable.expression_len != 0) {
memcpy(varlen_data
+ LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count,
filter_expression,
lsm.u.enable.expression_len);
}
- /* Add filter bytecode next */
+ /* Add filter bytecode next. */
if (ctx && lsm.u.enable.bytecode_len != 0) {
memcpy(varlen_data
+ LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count
ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data,
(LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) +
- lsm.u.enable.bytecode_len + lsm.u.enable.expression_len, NULL);
+ lsm.u.enable.bytecode_len + lsm.u.enable.expression_len,
+ NULL);
free(varlen_data);
mem_error:
filter_error:
if (free_filter_expression) {
/*
- * The filter expression has been replaced and must be freed as it is
- * not the original filter expression received as a parameter.
+ * The filter expression has been replaced and must be freed as
+ * it is not the original filter expression received as a
+ * parameter.
*/
free(filter_expression);
}
error:
/*
- * Return directly to the caller and don't ask the sessiond since something
- * went wrong in the parsing of data above.
+ * Return directly to the caller and don't ask the sessiond since
+ * something went wrong in the parsing of data above.
*/
return ret;
goto error;
}
- /* Empty filter string will always be rejected by the parser
+ /*
+ * Empty filter string will always be rejected by the parser
* anyway, so treat this corner-case early to eliminate
* lttng_fmemopen error for 0-byte allocation.
*/
agent_filter = set_agent_filter(filter_expression, ev);
if (!agent_filter) {
if (!filter_expression) {
- /* No JUL and no filter, just skip everything below. */
+ /*
+ * No JUL and no filter, just skip
+ * everything below.
+ */
goto ask_sessiond;
}
} else {
/*
- * With a JUL filter, the original filter has been added to it
- * thus replace the filter expression.
+ * With a JUL filter, the original filter has
+ * been added to it thus replace the filter
+ * expression.
*/
filter_expression = agent_filter;
free_filter_expression = 1;
goto mem_error;
}
- /* Add filter expression */
+ /* Add filter expression. */
if (lsm.u.disable.expression_len != 0) {
memcpy(varlen_data,
filter_expression,
lsm.u.disable.expression_len);
}
- /* Add filter bytecode next */
+ /* Add filter bytecode next. */
if (ctx && lsm.u.disable.bytecode_len != 0) {
memcpy(varlen_data
+ lsm.u.disable.expression_len,
filter_error:
if (free_filter_expression) {
/*
- * The filter expression has been replaced and must be freed as it is
- * not the original filter expression received as a parameter.
+ * The filter expression has been replaced and must be freed as
+ * it is not the original filter expression received as a
+ * parameter.
*/
free(filter_expression);
}
error:
/*
- * Return directly to the caller and don't ask the sessiond since something
- * went wrong in the parsing of data above.
+ * Return directly to the caller and don't ask the sessiond since
+ * something went wrong in the parsing of data above.
*/
return ret;
}
/*
- * Disable event(s) of a channel and domain.
- * If no event name is specified, all events are disabled.
- * If no channel name is specified, the default 'channel0' is used.
- * Returns size of returned session payload data or a negative error code.
+ * Disable event(s) of a channel and domain.
+ * If no event name is specified, all events are disabled.
+ * If no channel name is specified, the default 'channel0' is used.
+ * Returns size of returned session payload data or a negative error code.
*/
int lttng_disable_event(struct lttng_handle *handle, const char *name,
const char *channel_name)
}
/*
- * Enable channel per domain
- * Returns size of returned session payload data or a negative error code.
+ * Enable channel per domain
+ * Returns size of returned session payload data or a negative error code.
*/
int lttng_enable_channel(struct lttng_handle *handle,
struct lttng_channel *chan)
{
struct lttcomm_session_msg lsm;
- /*
- * NULL arguments are forbidden. No default values.
- */
+ /* NULL arguments are forbidden. No default values. */
if (handle == NULL || chan == NULL) {
return -LTTNG_ERR_INVALID;
}
}
/*
- * All tracing will be stopped for registered events of the channel.
- * Returns size of returned session payload data or a negative error code.
+ * All tracing will be stopped for registered events of the channel.
+ * Returns size of returned session payload data or a negative error code.
*/
int lttng_disable_channel(struct lttng_handle *handle, const char *name)
{
struct lttcomm_session_msg lsm;
- /* Safety check. Both are mandatory */
+ /* Safety check. Both are mandatory. */
if (handle == NULL || name == NULL) {
return -LTTNG_ERR_INVALID;
}
}
/*
- * Add PID to session tracker.
- * Return 0 on success else a negative LTTng error code.
+ * Add PID to session tracker.
+ * Return 0 on success else a negative LTTng error code.
*/
int lttng_track_pid(struct lttng_handle *handle, int pid)
{
struct lttcomm_session_msg lsm;
- /*
- * NULL arguments are forbidden. No default values.
- */
+ /* NULL arguments are forbidden. No default values. */
if (handle == NULL) {
return -LTTNG_ERR_INVALID;
}
}
/*
- * Remove PID from session tracker.
- * Return 0 on success else a negative LTTng error code.
+ * Remove PID from session tracker.
+ * Return 0 on success else a negative LTTng error code.
*/
int lttng_untrack_pid(struct lttng_handle *handle, int pid)
{
struct lttcomm_session_msg lsm;
- /*
- * NULL arguments are forbidden. No default values.
- */
+ /* NULL arguments are forbidden. No default values. */
if (handle == NULL) {
return -LTTNG_ERR_INVALID;
}
}
/*
- * Lists all available tracepoints of domain.
- * Sets the contents of the events array.
- * Returns the number of lttng_event entries in events;
- * on error, returns a negative value.
+ * Lists all available tracepoints of domain.
+ * Sets the contents of the events array.
+ * Returns the number of lttng_event entries in events;
+ * on error, returns a negative value.
*/
int lttng_list_tracepoints(struct lttng_handle *handle,
struct lttng_event **events)
}
/*
- * Lists all available tracepoint fields of domain.
- * Sets the contents of the event field array.
- * Returns the number of lttng_event_field entries in events;
- * on error, returns a negative value.
+ * Lists all available tracepoint fields of domain.
+ * Sets the contents of the event field array.
+ * Returns the number of lttng_event_field entries in events;
+ * on error, returns a negative value.
*/
int lttng_list_tracepoint_fields(struct lttng_handle *handle,
struct lttng_event_field **fields)
}
/*
- * Lists all available kernel system calls. Allocates and sets the contents of
- * the events array.
+ * Lists all available kernel system calls. Allocates and sets the contents of
+ * the events array.
*
- * Returns the number of lttng_event entries in events; on error, returns a
- * negative value.
+ * Returns the number of lttng_event entries in events; on error, returns a
+ * negative value.
*/
int lttng_list_syscalls(struct lttng_event **events)
{
}
/*
- * Returns a human readable string describing
- * the error code (a negative value).
+ * Returns a human readable string describing
+ * the error code (a negative value).
*/
const char *lttng_strerror(int code)
{
}
/*
- * Destroy session using name.
- * Returns size of returned session payload data or a negative error code.
+ * Destroy session using name.
+ * Returns size of returned session payload data or a negative error code.
*/
int lttng_destroy_session(const char *session_name)
{
}
/*
- * Ask the session daemon for all available sessions.
- * Sets the contents of the sessions array.
- * Returns the number of lttng_session entries in sessions;
- * on error, returns a negative value.
+ * Ask the session daemon for all available sessions.
+ * Sets the contents of the sessions array.
+ * Returns the number of lttng_session entries in sessions;
+ * on error, returns a negative value.
*/
int lttng_list_sessions(struct lttng_session **sessions)
{
}
/*
- * Ask the session daemon for all available domains of a session.
- * Sets the contents of the domains array.
- * Returns the number of lttng_domain entries in domains;
- * on error, returns a negative value.
+ * Ask the session daemon for all available domains of a session.
+ * Sets the contents of the domains array.
+ * Returns the number of lttng_domain entries in domains;
+ * on error, returns a negative value.
*/
int lttng_list_domains(const char *session_name,
struct lttng_domain **domains)
}
/*
- * Ask the session daemon for all available channels of a session.
- * Sets the contents of the channels array.
- * Returns the number of lttng_channel entries in channels;
- * on error, returns a negative value.
+ * Ask the session daemon for all available channels of a session.
+ * Sets the contents of the channels array.
+ * Returns the number of lttng_channel entries in channels;
+ * on error, returns a negative value.
*/
int lttng_list_channels(struct lttng_handle *handle,
struct lttng_channel **channels)
}
/*
- * Ask the session daemon for all available events of a session channel.
- * Sets the contents of the events array.
- * Returns the number of lttng_event entries in events;
- * on error, returns a negative value.
+ * Ask the session daemon for all available events of a session channel.
+ * Sets the contents of the events array.
+ * Returns the number of lttng_event entries in events;
+ * on error, returns a negative value.
*/
int lttng_list_events(struct lttng_handle *handle,
const char *channel_name, struct lttng_event **events)
switch (domain->type) {
case LTTNG_DOMAIN_KERNEL:
- attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
+ attr->switch_timer_interval =
+ DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
attr->subbuf_size = default_get_kernel_channel_subbuf_size();
attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
- attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
- attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER;
+ attr->switch_timer_interval =
+ DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
+ attr->read_timer_interval =
+ DEFAULT_UST_UID_CHANNEL_READ_TIMER;
break;
case LTTNG_BUFFER_PER_PID:
default:
attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
- attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
- attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER;
+ attr->switch_timer_interval =
+ DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
+ attr->read_timer_interval =
+ DEFAULT_UST_PID_CHANNEL_READ_TIMER;
break;
}
default:
ret = set_session_daemon_path();
if (ret < 0) {
- /* Error */
+ /* Error. */
return ret;
}
if (*sessiond_sock_path == '\0') {
/*
- * No socket path set. Weird error which means the constructor was not
- * called.
+ * No socket path set. Weird error which means the constructor
+ * was not called.
*/
assert(0);
}
ret = try_connect_sessiond(sessiond_sock_path);
if (ret < 0) {
- /* Not alive */
+ /* Not alive. */
return 0;
}
- /* Is alive */
+ /* Is alive. */
return 1;
}
lsm.cmd_type = LTTNG_CREATE_SESSION;
lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
- /* There should never be a data URL */
+ /* There should never be a data URL. */
size = uri_parse_str_urls(url, NULL, &uris);
if (size < 0) {
ret = -LTTNG_ERR_INVALID;
}
/*
- * lib constructor
+ * lib constructor.
*/
static void __attribute__((constructor)) init()
{
}
/*
- * lib destructor
+ * lib destructor.
*/
static void __attribute__((destructor)) lttng_ctl_exit()
{
projects / lttng-tools.git / blobdiff