* 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,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
#include <assert.h>
#include <grp.h>
#include <errno.h>
*/
int lttng_opt_quiet;
int lttng_opt_verbose;
+int lttng_opt_mi;
/*
* Copy string from src to dst and enforce null terminated byte.
case LTTNG_DOMAIN_KERNEL:
case LTTNG_DOMAIN_UST:
case LTTNG_DOMAIN_JUL:
+ case LTTNG_DOMAIN_LOG4J:
+ case LTTNG_DOMAIN_PYTHON:
memcpy(dst, src, sizeof(struct lttng_domain));
break;
default:
* On success, returns the number of bytes sent (>=0)
* On error, returns -1
*/
-static int send_session_varlen(void *data, size_t len)
+static int send_session_varlen(const void *data, size_t len)
{
int ret;
}
/*
- * 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)
/* Get number of supplementary group IDs */
grp_list_size = getgroups(0, NULL);
if (grp_list_size < 0) {
- perror("getgroups");
+ PERROR("getgroups");
goto end;
}
/* Alloc group list of the right size */
- grp_list = malloc(grp_list_size * sizeof(gid_t));
+ grp_list = zmalloc(grp_list_size * sizeof(gid_t));
if (!grp_list) {
- perror("malloc");
+ PERROR("malloc");
goto end;
}
grp_id = getgroups(grp_list_size, grp_list);
if (grp_id < 0) {
- perror("getgroups");
+ PERROR("getgroups");
goto free_list;
}
ret = lttcomm_connect_unix_sock(sock_path);
if (ret < 0) {
- /* Not alive */
+ /* Not alive. */
goto error;
}
ret = lttcomm_close_unix_sock(ret);
if (ret < 0) {
- perror("lttcomm_close_unix_sock");
+ PERROR("lttcomm_close_unix_sock");
}
return 0;
*/
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)
return ret;
}
+static int recv_sessiond_optional_data(size_t len, void **user_buf,
+ size_t *user_len)
+{
+ int ret = 0;
+ void *buf = NULL;
+
+ if (len) {
+ if (!user_len) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ buf = zmalloc(len);
+ if (!buf) {
+ ret = -ENOMEM;
+ goto end;
+ }
+
+ ret = recv_data_sessiond(buf, len);
+ if (ret < 0) {
+ goto end;
+ }
+
+ if (!user_buf) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /* Move ownership of command header buffer to user. */
+ *user_buf = buf;
+ buf = NULL;
+ *user_len = len;
+ } else {
+ /* No command header. */
+ if (user_len) {
+ *user_len = 0;
+ }
+
+ if (user_buf) {
+ *user_buf = NULL;
+ }
+ }
+
+end:
+ free(buf);
+ return ret;
+}
+
/*
* Ask the session daemon a specific command and put the data into buf.
* Takes extra var. len. data as input to send to the session daemon.
*/
LTTNG_HIDDEN
int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
- void *vardata, size_t varlen, void **buf)
+ const void *vardata, size_t vardata_len,
+ void **user_payload_buf, void **user_cmd_header_buf,
+ size_t *user_cmd_header_len)
{
int ret;
- size_t size;
- void *data = NULL;
+ size_t payload_len;
struct lttcomm_lttng_msg llm;
ret = connect_sessiond();
goto end;
}
/* Send var len data */
- ret = send_session_varlen(vardata, varlen);
+ ret = send_session_varlen(vardata, vardata_len);
if (ret < 0) {
/* Ret value is a valid lttng error code. */
goto end;
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);
+ /* Get command header from data transmission */
+ ret = recv_sessiond_optional_data(llm.cmd_header_size,
+ user_cmd_header_buf, user_cmd_header_len);
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 = -LTTNG_ERR_INVALID;
- free(data);
+ /* Get payload from data transmission */
+ ret = recv_sessiond_optional_data(llm.data_size, user_payload_buf,
+ &payload_len);
+ if (ret < 0) {
goto end;
}
- *buf = data;
- ret = size;
+ ret = llm.data_size;
end:
disconnect_sessiond();
/*
* 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,
{
struct lttng_handle *handle = NULL;
- if (domain == NULL) {
- goto end;
- }
-
- handle = malloc(sizeof(struct lttng_handle));
+ handle = zmalloc(sizeof(struct lttng_handle));
if (handle == NULL) {
PERROR("malloc handle");
goto end;
lttng_ctl_copy_string(handle->session_name, session_name,
sizeof(handle->session_name));
- /* Copy lttng domain */
- lttng_ctl_copy_lttng_domain(&handle->domain, domain);
+ /* Copy lttng domain or leave initialized to 0. */
+ if (domain) {
+ lttng_ctl_copy_lttng_domain(&handle->domain, domain);
+ }
end:
return handle;
/*
* 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);
+ lttng_ctl_copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+
+ 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));
- lttng_ctl_copy_string(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
+ if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
+ /*
+ * Don't leak application addresses to the sessiond.
+ * This is only necessary when ctx is for an app ctx otherwise
+ * the values inside the union (type & config) are overwritten.
+ */
+ lsm.u.context.ctx.u.app_ctx.provider_name = NULL;
+ lsm.u.context.ctx.u.app_ctx.ctx_name = NULL;
+ }
- return lttng_ctl_ask_sessiond(&lsm, NULL);
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&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)
}
/*
- * Depending on the event, return a newly allocated JUL filter expression or
+ * Depending on the event, return a newly allocated agent filter expression or
* NULL if not applicable.
*
* An event with NO loglevel and the name is * will return NULL.
*/
-static char *set_jul_filter(const char *filter, struct lttng_event *ev)
+static char *set_agent_filter(const char *filter, struct lttng_event *ev)
{
int err;
- char *jul_filter = NULL;
+ char *agent_filter = NULL;
assert(ev);
/* Don't add filter for the '*' event. */
if (ev->name[0] != '*') {
if (filter) {
- err = asprintf(&jul_filter, "%s && logger_name == \"%s\"", filter,
+ err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter,
ev->name);
} else {
- err = asprintf(&jul_filter, "logger_name == \"%s\"", ev->name);
+ err = asprintf(&agent_filter, "logger_name == \"%s\"", ev->name);
}
if (err < 0) {
PERROR("asprintf");
op = "==";
}
- if (filter || jul_filter) {
+ if (filter || agent_filter) {
char *new_filter;
- err = asprintf(&new_filter, "%s && int_loglevel %s %d",
- jul_filter ? jul_filter : filter, op,
+ err = asprintf(&new_filter, "(%s) && (int_loglevel %s %d)",
+ agent_filter ? agent_filter : filter, op,
ev->loglevel);
- if (jul_filter) {
- free(jul_filter);
+ if (agent_filter) {
+ free(agent_filter);
}
- jul_filter = new_filter;
+ agent_filter = new_filter;
} else {
- err = asprintf(&jul_filter, "int_loglevel %s %d", op,
+ err = asprintf(&agent_filter, "int_loglevel %s %d", op,
ev->loglevel);
}
if (err < 0) {
}
}
- return jul_filter;
+ return agent_filter;
error:
- free(jul_filter);
+ free(agent_filter);
return NULL;
}
/*
- * Generate the filter bytecode from a give filter expression string. Put the
+ * Generate the filter bytecode from a given filter expression string. Put the
* newly allocated parser context in ctxp and populate the lsm object with the
* expression len.
*
ret = -LTTNG_ERR_FILTER_INVAL;
goto parse_error;
}
+ /* Validate strings used as literals in the expression. */
+ ret = filter_visitor_ir_validate_string(ctx);
+ if (ret) {
+ ret = -LTTNG_ERR_FILTER_INVAL;
+ goto parse_error;
+ }
dbg_printf("done\n");
dbg_printf("Generating bytecode... ");
/* No need to keep the memory stream. */
if (fclose(fmem) != 0) {
- perror("fclose");
+ PERROR("fclose");
}
*ctxp = ctx;
filter_parser_ctx_free(ctx);
filter_alloc_error:
if (fclose(fmem) != 0) {
- perror("fclose");
+ PERROR("fclose");
}
error:
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.
*/
sizeof(lsm.u.enable.channel_name));
}
- if (ev->name[0] != '\0') {
- lsm.cmd_type = LTTNG_ENABLE_EVENT;
- } else {
- lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
+ lsm.cmd_type = LTTNG_ENABLE_EVENT;
+ if (ev->name[0] == '\0') {
+ /* Enable all events */
+ lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name));
}
lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
+ /* FIXME: copying non-packed struct to packed struct. */
memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
lttng_ctl_copy_string(lsm.session.name, handle->session_name,
* filtering by logger name.
*/
if (exclusion_count == 0 && filter_expression == NULL &&
- handle->domain.type != LTTNG_DOMAIN_JUL) {
+ (handle->domain.type != LTTNG_DOMAIN_JUL &&
+ handle->domain.type != LTTNG_DOMAIN_LOG4J &&
+ handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
goto ask_sessiond;
}
/*
* 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 */
- if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL) {
- if (handle->domain.type == LTTNG_DOMAIN_JUL) {
- char *jul_filter;
+ /* 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) {
+ if (handle->domain.type == LTTNG_DOMAIN_JUL ||
+ handle->domain.type == LTTNG_DOMAIN_LOG4J ||
+ handle->domain.type == LTTNG_DOMAIN_PYTHON) {
+ char *agent_filter;
/* Setup JUL filter if needed. */
- jul_filter = set_jul_filter(filter_expression, ev);
- if (!jul_filter) {
+ 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 an agent filter, the original filter has
+ * been added to it thus replace the filter
+ * expression.
*/
- filter_expression = jul_filter;
+ filter_expression = agent_filter;
free_filter_expression = 1;
}
}
+ LTTNG_SYMBOL_NAME_LEN * exclusion_count);
if (!varlen_data) {
ret = -LTTNG_ERR_EXCLUSION_NOMEM;
- goto filter_error;
+ 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);
+ *(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
lsm.u.enable.bytecode_len);
}
- ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data,
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&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);
-filter_error:
- if (filter_expression) {
+mem_error:
+ if (filter_expression && ctx) {
filter_bytecode_free(ctx);
filter_ir_free(ctx);
filter_parser_ctx_free(ctx);
- 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.
- */
- free(filter_expression);
- }
+ }
+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.
+ */
+ 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;
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.
- */
-int lttng_disable_event(struct lttng_handle *handle, const char *name,
- const char *channel_name)
+int lttng_disable_event_ext(struct lttng_handle *handle,
+ struct lttng_event *ev, const char *channel_name,
+ const char *original_filter_expression)
{
struct lttcomm_session_msg lsm;
+ char *varlen_data;
+ int ret = 0;
+ unsigned int free_filter_expression = 0;
+ struct filter_parser_ctx *ctx = NULL;
+ /*
+ * Cast as non-const since we may replace the filter expression
+ * by a dynamically allocated string. Otherwise, the original
+ * string is not modified.
+ */
+ char *filter_expression = (char *) original_filter_expression;
- if (handle == NULL) {
- return -LTTNG_ERR_INVALID;
+ if (handle == NULL || ev == NULL) {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ /*
+ * 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.
+ */
+ if (filter_expression && filter_expression[0] == '\0') {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
}
memset(&lsm, 0, sizeof(lsm));
sizeof(lsm.u.disable.channel_name));
}
- lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
+ lsm.cmd_type = LTTNG_DISABLE_EVENT;
- if (name != NULL) {
- lttng_ctl_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;
- }
+ lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
+ /* FIXME: copying non-packed struct to packed struct. */
+ memcpy(&lsm.u.disable.event, ev, sizeof(lsm.u.disable.event));
lttng_ctl_copy_string(lsm.session.name, handle->session_name,
sizeof(lsm.session.name));
+ lsm.u.disable.bytecode_len = 0;
- return lttng_ctl_ask_sessiond(&lsm, NULL);
+ /*
+ * For the JUL domain, a filter is enforced except for the
+ * disable all event. This is done to avoid having the event in
+ * all sessions thus filtering by logger name.
+ */
+ if (filter_expression == NULL &&
+ (handle->domain.type != LTTNG_DOMAIN_JUL &&
+ handle->domain.type != LTTNG_DOMAIN_LOG4J &&
+ handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
+ goto ask_sessiond;
+ }
+
+ /*
+ * We have a filter, so we need to set up a variable-length
+ * memory block from where to send the data.
+ */
+
+ /* 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) {
+ if (handle->domain.type == LTTNG_DOMAIN_JUL ||
+ handle->domain.type == LTTNG_DOMAIN_LOG4J ||
+ handle->domain.type == LTTNG_DOMAIN_PYTHON) {
+ char *agent_filter;
+
+ /* Setup JUL filter if needed. */
+ agent_filter = set_agent_filter(filter_expression, ev);
+ if (!agent_filter) {
+ if (!filter_expression) {
+ /*
+ * 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.
+ */
+ filter_expression = agent_filter;
+ free_filter_expression = 1;
+ }
+ }
+
+ ret = generate_filter(filter_expression, &lsm, &ctx);
+ if (ret) {
+ goto filter_error;
+ }
+ }
+
+ varlen_data = zmalloc(lsm.u.disable.bytecode_len
+ + lsm.u.disable.expression_len);
+ if (!varlen_data) {
+ ret = -LTTNG_ERR_EXCLUSION_NOMEM;
+ goto mem_error;
+ }
+
+ /* Add filter expression. */
+ if (lsm.u.disable.expression_len != 0) {
+ memcpy(varlen_data,
+ filter_expression,
+ lsm.u.disable.expression_len);
+ }
+ /* Add filter bytecode next. */
+ if (ctx && lsm.u.disable.bytecode_len != 0) {
+ memcpy(varlen_data
+ + lsm.u.disable.expression_len,
+ &ctx->bytecode->b,
+ lsm.u.disable.bytecode_len);
+ }
+
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, varlen_data,
+ lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL);
+ free(varlen_data);
+
+mem_error:
+ if (filter_expression && ctx) {
+ filter_bytecode_free(ctx);
+ filter_ir_free(ctx);
+ filter_parser_ctx_free(ctx);
+ }
+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.
+ */
+ 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 ret;
+
+ask_sessiond:
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+ return ret;
}
/*
- * Enable channel per domain
- * 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)
+{
+ struct lttng_event ev;
+
+ memset(&ev, 0, sizeof(ev));
+ ev.loglevel = -1;
+ ev.type = LTTNG_EVENT_ALL;
+ lttng_ctl_copy_string(ev.name, name, sizeof(ev.name));
+ return lttng_disable_event_ext(handle, &ev, channel_name, NULL);
+}
+
+/*
+ * 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;
}
}
/*
- * 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.
+ * 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. */
+ if (handle == NULL) {
+ return -LTTNG_ERR_INVALID;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+
+ lsm.cmd_type = LTTNG_TRACK_PID;
+ lsm.u.pid_tracker.pid = pid;
+
+ lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ lttng_ctl_copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+
+ return lttng_ctl_ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * 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. */
+ if (handle == NULL) {
+ return -LTTNG_ERR_INVALID;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+
+ lsm.cmd_type = LTTNG_UNTRACK_PID;
+ lsm.u.pid_tracker.pid = pid;
+
+ lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ lttng_ctl_copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+
+ return lttng_ctl_ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * 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)
}
/*
- * Returns a human readable string describing
- * the error code (a negative value).
+ * 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.
+ */
+int lttng_list_syscalls(struct lttng_event **events)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ if (!events) {
+ return -LTTNG_ERR_INVALID;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_LIST_SYSCALLS;
+ /* Force kernel domain for system calls. */
+ lsm.domain.type = LTTNG_DOMAIN_KERNEL;
+
+ ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return ret / sizeof(struct lttng_event);
+}
+
+/*
+ * Returns a human readable string describing
+ * the error code (a negative value).
*/
const char *lttng_strerror(int code)
{
lsm.u.uri.size = size;
- ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
sizeof(struct lttng_uri) * size, NULL);
free(uris);
}
/*
- * 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)
+static
+int _lttng_destroy_session(const char *session_name)
{
struct lttcomm_session_msg lsm;
}
/*
- * 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.
+ * Stop the session and wait for the data before destroying it
+ */
+int lttng_destroy_session(const char *session_name)
+{
+ int ret;
+
+ /*
+ * Stop the tracing and wait for the data.
+ */
+ ret = _lttng_stop_tracing(session_name, 1);
+ if (ret && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
+ goto end;
+ }
+
+ ret = _lttng_destroy_session(session_name);
+end:
+ return ret;
+}
+
+/*
+ * Destroy the session without waiting for the data.
+ */
+int lttng_destroy_session_no_wait(const char *session_name)
+{
+ int ret;
+
+ /*
+ * Stop the tracing without waiting for the data.
+ * The session might already have been stopped, so just
+ * skip this error.
+ */
+ ret = _lttng_stop_tracing(session_name, 0);
+ if (ret && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
+ goto end;
+ }
+
+ ret = _lttng_destroy_session(session_name);
+end:
+ return ret;
+}
+
+/*
+ * 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)
{
return ret / sizeof(struct lttng_session);
}
+int lttng_set_session_shm_path(const char *session_name,
+ const char *shm_path)
+{
+ struct lttcomm_session_msg lsm;
+
+ if (session_name == NULL) {
+ return -LTTNG_ERR_INVALID;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_SET_SESSION_SHM_PATH;
+
+ lttng_ctl_copy_string(lsm.session.name, session_name,
+ sizeof(lsm.session.name));
+ lttng_ctl_copy_string(lsm.u.set_shm_path.shm_path, shm_path,
+ sizeof(lsm.u.set_shm_path.shm_path));
+
+ return lttng_ctl_ask_sessiond(&lsm, NULL);
+}
+
/*
- * 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)
{
int ret;
+ size_t channel_count, i;
+ const size_t channel_size = sizeof(struct lttng_channel) +
+ sizeof(struct lttcomm_channel_extended);
struct lttcomm_session_msg lsm;
+ void *extended_at;
if (handle == NULL) {
- return -LTTNG_ERR_INVALID;
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
memset(&lsm, 0, sizeof(lsm));
ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
if (ret < 0) {
- return ret;
+ goto end;
}
- return ret / sizeof(struct lttng_channel);
+ if (ret % channel_size) {
+ ret = -LTTNG_ERR_UNK;
+ free(*channels);
+ *channels = NULL;
+ goto end;
+ }
+ channel_count = (size_t) ret / channel_size;
+
+ /* Set extended info pointers */
+ extended_at = ((void *) *channels) +
+ channel_count * sizeof(struct lttng_channel);
+ for (i = 0; i < channel_count; i++) {
+ struct lttng_channel *chan = &(*channels)[i];
+
+ chan->attr.extended.ptr = extended_at;
+ extended_at += sizeof(struct lttcomm_channel_extended);
+ }
+
+ ret = (int) channel_count;
+end:
+ return ret;
}
/*
- * 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)
{
int ret;
struct lttcomm_session_msg lsm;
+ struct lttcomm_event_command_header *cmd_header = NULL;
+ size_t cmd_header_len;
+ uint32_t nb_events, i;
+ void *extended_at;
/* Safety check. An handle and channel name are mandatory */
if (handle == NULL || channel_name == NULL) {
sizeof(lsm.session.name));
lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name,
sizeof(lsm.u.list.channel_name));
-
lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
- ret = lttng_ctl_ask_sessiond(&lsm, (void**) events);
+ ret = lttng_ctl_ask_sessiond_varlen(&lsm, NULL, 0, (void **) events,
+ (void **) &cmd_header, &cmd_header_len);
if (ret < 0) {
- return ret;
+ goto error;
}
- return ret / sizeof(struct lttng_event);
+ /* Set number of events and free command header */
+ nb_events = cmd_header->nb_events;
+ if (nb_events > INT_MAX) {
+ ret = -EOVERFLOW;
+ goto error;
+ }
+ ret = (int) nb_events;
+ free(cmd_header);
+ cmd_header = NULL;
+
+ /* Set extended info pointers */
+ extended_at = ((void*) (*events)) +
+ nb_events * sizeof(struct lttng_event);
+
+ for (i = 0; i < nb_events; i++) {
+ struct lttcomm_event_extended_header *ext_header;
+ struct lttng_event *event = &(*events)[i];
+
+ event->extended.ptr = extended_at;
+ ext_header =
+ (struct lttcomm_event_extended_header *) extended_at;
+ extended_at += sizeof(*ext_header);
+ extended_at += ext_header->filter_len;
+ extended_at +=
+ ext_header->nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
+ }
+
+ return ret;
+error:
+ free(cmd_header);
+ free(*events);
+ return ret;
+}
+
+int lttng_event_get_filter_expression(struct lttng_event *event,
+ const char **filter_expression)
+{
+ int ret = 0;
+ struct lttcomm_event_extended_header *ext_header;
+
+ if (!event || !filter_expression) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ext_header = event->extended.ptr;
+
+ if (!ext_header) {
+ /*
+ * This can happen since the lttng_event structure is
+ * used for other tasks where this pointer is never set.
+ */
+ *filter_expression = NULL;
+ goto end;
+ }
+
+ if (ext_header->filter_len) {
+ *filter_expression = ((const char *) (ext_header)) +
+ sizeof(*ext_header);
+ } else {
+ *filter_expression = NULL;
+ }
+
+end:
+ return ret;
+}
+
+int lttng_event_get_exclusion_name_count(struct lttng_event *event)
+{
+ int ret;
+ struct lttcomm_event_extended_header *ext_header;
+
+ if (!event) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ext_header = event->extended.ptr;
+ if (!ext_header) {
+ /*
+ * This can happen since the lttng_event structure is
+ * used for other tasks where this pointer is never set.
+ */
+ ret = 0;
+ goto end;
+ }
+
+ if (ext_header->nb_exclusions > INT_MAX) {
+ ret = -LTTNG_ERR_OVERFLOW;
+ goto end;
+ }
+ ret = (int) ext_header->nb_exclusions;
+end:
+ return ret;
+}
+
+int lttng_event_get_exclusion_name(struct lttng_event *event,
+ size_t index, const char **exclusion_name)
+{
+ int ret = 0;
+ struct lttcomm_event_extended_header *ext_header;
+ void *at;
+
+ if (!event || !exclusion_name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ext_header = event->extended.ptr;
+ if (!ext_header) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (index >= ext_header->nb_exclusions) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ at = (void *) ext_header + sizeof(*ext_header);
+ at += ext_header->filter_len;
+ at += index * LTTNG_SYMBOL_NAME_LEN;
+ *exclusion_name = at;
+
+end:
+ return ret;
}
/*
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:
}
}
+int lttng_channel_get_discarded_event_count(struct lttng_channel *channel,
+ uint64_t *discarded_events)
+{
+ int ret = 0;
+ struct lttcomm_channel_extended *chan_ext;
+
+ if (!channel || !discarded_events) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ chan_ext = channel->attr.extended.ptr;
+ if (!chan_ext) {
+ /*
+ * This can happen since the lttng_channel structure is
+ * used for other tasks where this pointer is never set.
+ */
+ *discarded_events = 0;
+ goto end;
+ }
+
+ *discarded_events = chan_ext->discarded_events;
+end:
+ return ret;
+}
+
+int lttng_channel_get_lost_packet_count(struct lttng_channel *channel,
+ uint64_t *lost_packets)
+{
+ int ret = 0;
+ struct lttcomm_channel_extended *chan_ext;
+
+ if (!channel || !lost_packets) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ chan_ext = channel->attr.extended.ptr;
+ if (!chan_ext) {
+ /*
+ * This can happen since the lttng_channel structure is
+ * used for other tasks where this pointer is never set.
+ */
+ *lost_packets = 0;
+ goto end;
+ }
+
+ *lost_packets = chan_ext->lost_packets;
+end:
+ return ret;
+}
+
/*
* Check if session daemon is alive.
*
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.u.uri.size = size;
- ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
sizeof(struct lttng_uri) * size, NULL);
free(uris);
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;
}
}
- ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
sizeof(struct lttng_uri) * size, NULL);
error:
{
int ret;
struct lttcomm_session_msg lsm;
+ uint8_t *pending = NULL;
if (session_name == NULL) {
return -LTTNG_ERR_INVALID;
lttng_ctl_copy_string(lsm.session.name, session_name,
sizeof(lsm.session.name));
- ret = lttng_ctl_ask_sessiond(&lsm, NULL);
-
- /*
- * The lttng_ctl_ask_sessiond function negate the return code if it's not
- * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
- * that the data is available. Yes it is hackish but for now this is the
- * only way.
- */
- if (ret == -1) {
- ret = 1;
+ ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pending);
+ if (ret < 0) {
+ goto end;
+ } else if (ret != 1) {
+ /* Unexpected payload size */
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
+ ret = (int) *pending;
+end:
+ free(pending);
return ret;
}
lsm.u.uri.size = size;
- ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
sizeof(struct lttng_uri) * size, NULL);
free(uris);
struct lttcomm_session_msg lsm;
struct lttng_uri *uris = NULL;
- if (name == NULL) {
+ if (name == NULL || timer_interval == 0) {
return -LTTNG_ERR_INVALID;
}
lsm.u.session_live.nb_uri = size;
lsm.u.session_live.timer_interval = timer_interval;
- ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris,
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
sizeof(struct lttng_uri) * size, NULL);
end:
}
/*
- * lib constructor
+ * List PIDs in the tracker.
+ *
+ * enabled is set to whether the PID tracker is enabled.
+ * pids is set to an allocated array of PIDs currently tracked. On
+ * success, pids must be freed by the caller.
+ * nr_pids is set to the number of entries contained by the pids array.
+ *
+ * Returns 0 on success, else a negative LTTng error code.
+ */
+int lttng_list_tracker_pids(struct lttng_handle *handle,
+ int *_enabled, int32_t **_pids, size_t *_nr_pids)
+{
+ int ret;
+ int enabled = 1;
+ struct lttcomm_session_msg lsm;
+ size_t nr_pids;
+ int32_t *pids;
+
+ if (handle == NULL) {
+ return -LTTNG_ERR_INVALID;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_LIST_TRACKER_PIDS;
+ lttng_ctl_copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pids);
+ if (ret < 0) {
+ return ret;
+ }
+ nr_pids = ret / sizeof(int32_t);
+ if (nr_pids == 1 && pids[0] == -1) {
+ free(pids);
+ pids = NULL;
+ enabled = 0;
+ nr_pids = 0;
+ }
+ *_enabled = enabled;
+ *_pids = pids;
+ *_nr_pids = nr_pids;
+ return 0;
+}
+
+/*
+ * Regenerate the metadata for a session.
+ * Return 0 on success, a negative error code on error.
+ */
+int lttng_metadata_regenerate(const char *session_name)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ if (!session_name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_METADATA_REGENERATE;
+
+ lttng_ctl_copy_string(lsm.session.name, session_name,
+ sizeof(lsm.session.name));
+
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+ if (ret < 0) {
+ goto end;
+ }
+
+ ret = 0;
+end:
+ return ret;
+}
+
+/*
+ * lib constructor.
*/
static void __attribute__((constructor)) init()
{
}
/*
- * lib destructor
+ * lib destructor.
*/
static void __attribute__((destructor)) lttng_ctl_exit()
{
projects / lttng-tools.git / blobdiff