/*
- * liblttngctl.c
+ * lttng-ctl.c
*
* Linux Trace Toolkit Control Library
*
#include <unistd.h>
#include <common/common.h>
+#include <common/compat/string.h>
#include <common/defaults.h>
#include <common/sessiond-comm/sessiond-comm.h>
#include <common/uri.h>
#include <common/utils.h>
+#include <common/dynamic-buffer.h>
#include <lttng/lttng.h>
#include <lttng/health-internal.h>
+#include <lttng/trigger/trigger-internal.h>
+#include <lttng/endpoint.h>
+#include <lttng/channel-internal.h>
+#include <lttng/event-internal.h>
+#include <lttng/userspace-probe-internal.h>
+#include <lttng/session-internal.h>
+#include <lttng/session-descriptor-internal.h>
#include "filter/filter-ast.h"
#include "filter/filter-parser.h"
return ret;
}
+/*
+ * Send file descriptors to the session daemon.
+ *
+ * On success, returns the number of bytes sent (>=0)
+ * On error, returns -1
+ */
+static int send_session_fds(const int *fds, size_t nb_fd)
+{
+ int ret;
+
+ if (!connected) {
+ ret = -LTTNG_ERR_NO_SESSIOND;
+ goto end;
+ }
+
+ if (!fds || !nb_fd) {
+ ret = 0;
+ goto end;
+ }
+
+ ret = lttcomm_send_fds_unix_sock(sessiond_socket, fds, nb_fd);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_FATAL;
+ }
+
+end:
+ return ret;
+}
+
/*
* Receive data from the sessiond socket.
*
LTTNG_HIDDEN
int lttng_check_tracing_group(void)
{
- struct group *grp_tracing; /* no free(). See getgrnam(3) */
- gid_t *grp_list;
+ gid_t *grp_list, tracing_gid;
int grp_list_size, grp_id, i;
int ret = -1;
const char *grp_name = tracing_group;
/* Get GID of group 'tracing' */
- grp_tracing = getgrnam(grp_name);
- if (!grp_tracing) {
+ if (utils_get_group_id(grp_name, false, &tracing_gid)) {
/* If grp_tracing is NULL, the group does not exist. */
goto end;
}
}
for (i = 0; i < grp_list_size; i++) {
- if (grp_list[i] == grp_tracing->gr_gid) {
+ if (grp_list[i] == tracing_gid) {
ret = 1;
break;
}
return ret;
}
+static int check_enough_available_memory(size_t num_bytes_requested_per_cpu)
+{
+ int ret;
+ long num_cpu;
+ size_t best_mem_info;
+ size_t num_bytes_requested_total;
+
+ /*
+ * Get the number of CPU currently online to compute the amount of
+ * memory needed to create a buffer for every CPU.
+ */
+ num_cpu = sysconf(_SC_NPROCESSORS_ONLN);
+ if (num_cpu == -1) {
+ goto error;
+ }
+
+ num_bytes_requested_total = num_bytes_requested_per_cpu * num_cpu;
+
+ /*
+ * Try to get the `MemAvail` field of `/proc/meminfo`. This is the most
+ * reliable estimate we can get but it is only exposed by the kernel
+ * since 3.14. (See Linux kernel commit:
+ * 34e431b0ae398fc54ea69ff85ec700722c9da773)
+ */
+ ret = utils_get_memory_available(&best_mem_info);
+ if (ret >= 0) {
+ goto success;
+ }
+
+ /*
+ * As a backup plan, use `MemTotal` field of `/proc/meminfo`. This
+ * is a sanity check for obvious user error.
+ */
+ ret = utils_get_memory_total(&best_mem_info);
+ if (ret >= 0) {
+ goto success;
+ }
+
+error:
+ return -1;
+success:
+ return best_mem_info >= num_bytes_requested_total;
+}
+
/*
* Try connect to session daemon with sock_path.
*
/*
* 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.
+ * Takes extra var. len. data and file descriptors as input to send to the
+ * session daemon.
*
* Return size of data (only payload, not header) or a negative error code.
*/
LTTNG_HIDDEN
-int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
- const void *vardata, size_t vardata_len,
- void **user_payload_buf, void **user_cmd_header_buf,
- size_t *user_cmd_header_len)
+int lttng_ctl_ask_sessiond_fds_varlen(struct lttcomm_session_msg *lsm,
+ const int *fds, size_t nb_fd, 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 payload_len;
goto end;
}
+ /* Send fds */
+ ret = send_session_fds(fds, nb_fd);
+ if (ret < 0) {
+ /* Ret value is a valid lttng error code. */
+ goto end;
+ }
+
/* Get header from data transmission */
ret = recv_data_sessiond(&llm, sizeof(llm));
if (ret < 0) {
{
struct lttng_handle *handle = NULL;
- if (domain == NULL) {
- goto end;
- }
-
handle = zmalloc(sizeof(struct lttng_handle));
if (handle == NULL) {
PERROR("malloc handle");
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;
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;
+
+ 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;
+ }
ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, buf, len, NULL);
end:
assert(ev);
/* Don't add filter for the '*' event. */
- if (ev->name[0] != '*') {
+ if (strcmp(ev->name, "*") != 0) {
if (filter) {
err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter,
ev->name);
ret = -LTTNG_ERR_FILTER_INVAL;
goto parse_error;
}
- ret = filter_visitor_set_parent(ctx);
- if (ret) {
- fprintf(stderr, "Set parent error\n");
- ret = -LTTNG_ERR_FILTER_INVAL;
- goto parse_error;
- }
if (print_xml) {
ret = filter_visitor_print_xml(ctx, stdout, 0);
if (ret) {
ret = -LTTNG_ERR_FILTER_INVAL;
goto parse_error;
}
+
+ /* Normalize globbing patterns in the expression. */
+ ret = filter_visitor_ir_normalize_glob_patterns(ctx);
+ if (ret) {
+ 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;
}
+
+ /* Validate globbing patterns in the expression. */
+ ret = filter_visitor_ir_validate_globbing(ctx);
+ if (ret) {
+ ret = -LTTNG_ERR_FILTER_INVAL;
+ goto parse_error;
+ }
+
dbg_printf("done\n");
dbg_printf("Generating bytecode... ");
int exclusion_count, char **exclusion_list)
{
struct lttcomm_session_msg lsm;
- char *varlen_data;
- int ret = 0;
+ struct lttng_dynamic_buffer send_buffer;
+ int ret = 0, i, fd_to_send = -1;
+ bool send_fd = false;
unsigned int free_filter_expression = 0;
struct filter_parser_ctx *ctx = NULL;
+
+ /*
+ * 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.
+ */
+ lttng_dynamic_buffer_init(&send_buffer);
+
/*
* Cast as non-const since we may replace the filter expression
* by a dynamically allocated string. Otherwise, the original
lsm.u.enable.exclusion_count = exclusion_count;
lsm.u.enable.bytecode_len = 0;
- /*
- * For the JUL domain, a filter is enforced except for the enable all
- * event. This is done to avoid having the event in all sessions thus
- * filtering by logger name.
- */
- if (exclusion_count == 0 && 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 either a filter or some exclusions, 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
}
}
- varlen_data = zmalloc(lsm.u.enable.bytecode_len
+ ret = lttng_dynamic_buffer_set_capacity(&send_buffer,
+ lsm.u.enable.bytecode_len
+ lsm.u.enable.expression_len
+ LTTNG_SYMBOL_NAME_LEN * exclusion_count);
- if (!varlen_data) {
+ if (ret) {
ret = -LTTNG_ERR_EXCLUSION_NOMEM;
goto mem_error;
}
/* 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);
+ for (i = 0; i < exclusion_count; i++) {
+ size_t exclusion_len;
+
+ exclusion_len = lttng_strnlen(*(exclusion_list + i),
+ LTTNG_SYMBOL_NAME_LEN);
+ if (exclusion_len == LTTNG_SYMBOL_NAME_LEN) {
+ /* Exclusion is not NULL-terminated. */
+ ret = -LTTNG_ERR_INVALID;
+ goto mem_error;
+ }
+
+ ret = lttng_dynamic_buffer_append(&send_buffer,
+ *(exclusion_list + i),
+ LTTNG_SYMBOL_NAME_LEN);
+ if (ret) {
+ goto mem_error;
+ }
}
+
/* 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);
+ if (filter_expression) {
+ ret = lttng_dynamic_buffer_append(&send_buffer,
+ filter_expression, lsm.u.enable.expression_len);
+ if (ret) {
+ goto mem_error;
+ }
}
/* 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.expression_len,
- &ctx->bytecode->b,
- lsm.u.enable.bytecode_len);
+ ret = lttng_dynamic_buffer_append(&send_buffer,
+ &ctx->bytecode->b, lsm.u.enable.bytecode_len);
+ if (ret) {
+ goto mem_error;
+ }
}
+ if (ev->extended.ptr) {
+ struct lttng_event_extended *ev_ext =
+ (struct lttng_event_extended *) ev->extended.ptr;
+
+ if (ev_ext->probe_location) {
+ /*
+ * lttng_userspace_probe_location_serialize returns the
+ * number of bytes that was appended to the buffer.
+ */
+ ret = lttng_userspace_probe_location_serialize(
+ ev_ext->probe_location, &send_buffer,
+ &fd_to_send);
+ if (ret < 0) {
+ goto mem_error;
+ }
- 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);
- free(varlen_data);
+ send_fd = fd_to_send >= 0;
+ /*
+ * Set the size of the userspace probe location element
+ * of the buffer so that the receiving side knows where
+ * to split it.
+ */
+ lsm.u.enable.userspace_probe_location_len = ret;
+ }
+ }
+
+ ret = lttng_ctl_ask_sessiond_fds_varlen(&lsm,
+ send_fd ? &fd_to_send : NULL,
+ send_fd ? 1 : 0,
+ send_buffer.size ? send_buffer.data : NULL,
+ send_buffer.size, NULL, NULL, 0);
mem_error:
if (filter_expression && ctx) {
* Return directly to the caller and don't ask the sessiond since
* something went wrong in the parsing of data above.
*/
+ lttng_dynamic_buffer_reset(&send_buffer);
return ret;
ask_sessiond:
return lttng_disable_event_ext(handle, &ev, channel_name, NULL);
}
+struct lttng_channel *lttng_channel_create(struct lttng_domain *domain)
+{
+ struct lttng_channel *channel = NULL;
+ struct lttng_channel_extended *extended = NULL;
+
+ if (!domain) {
+ goto error;
+ }
+
+ /* Validate domain. */
+ switch (domain->type) {
+ case LTTNG_DOMAIN_UST:
+ switch (domain->buf_type) {
+ case LTTNG_BUFFER_PER_UID:
+ case LTTNG_BUFFER_PER_PID:
+ break;
+ default:
+ goto error;
+ }
+ break;
+ case LTTNG_DOMAIN_KERNEL:
+ if (domain->buf_type != LTTNG_BUFFER_GLOBAL) {
+ goto error;
+ }
+ break;
+ default:
+ goto error;
+ }
+
+ channel = zmalloc(sizeof(*channel));
+ if (!channel) {
+ goto error;
+ }
+
+ extended = zmalloc(sizeof(*extended));
+ if (!extended) {
+ goto error;
+ }
+
+ channel->attr.extended.ptr = extended;
+
+ lttng_channel_set_default_attr(domain, &channel->attr);
+ return channel;
+error:
+ free(channel);
+ free(extended);
+ return NULL;
+}
+
+void lttng_channel_destroy(struct lttng_channel *channel)
+{
+ if (!channel) {
+ return;
+ }
+
+ if (channel->attr.extended.ptr) {
+ free(channel->attr.extended.ptr);
+ }
+ free(channel);
+}
+
/*
* 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 lttng_channel *in_chan)
{
struct lttcomm_session_msg lsm;
+ size_t total_buffer_size_needed_per_cpu = 0;
/* NULL arguments are forbidden. No default values. */
- if (handle == NULL || chan == NULL) {
+ if (handle == NULL || in_chan == NULL) {
return -LTTNG_ERR_INVALID;
}
memset(&lsm, 0, sizeof(lsm));
+ memcpy(&lsm.u.channel.chan, in_chan, sizeof(lsm.u.channel.chan));
+ lsm.u.channel.chan.attr.extended.ptr = NULL;
- memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
+ if (!in_chan->attr.extended.ptr) {
+ struct lttng_channel *channel;
+ struct lttng_channel_extended *extended;
- lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
+ channel = lttng_channel_create(&handle->domain);
+ if (!channel) {
+ return -LTTNG_ERR_NOMEM;
+ }
+
+ /*
+ * Create a new channel in order to use default extended
+ * attribute values.
+ */
+ extended = (struct lttng_channel_extended *)
+ channel->attr.extended.ptr;
+ memcpy(&lsm.u.channel.extended, extended, sizeof(*extended));
+ lttng_channel_destroy(channel);
+ } else {
+ struct lttng_channel_extended *extended;
+
+ extended = (struct lttng_channel_extended *)
+ in_chan->attr.extended.ptr;
+ memcpy(&lsm.u.channel.extended, extended, sizeof(*extended));
+ }
+
+ /*
+ * Verify that the amount of memory required to create the requested
+ * buffer is available on the system at the moment.
+ */
+ total_buffer_size_needed_per_cpu = lsm.u.channel.chan.attr.num_subbuf *
+ lsm.u.channel.chan.attr.subbuf_size;
+ if (!check_enough_available_memory(total_buffer_size_needed_per_cpu)) {
+ return -LTTNG_ERR_NOMEM;
+ }
+ lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
lttng_ctl_copy_string(lsm.session.name, handle->session_name,
return error_get_str(code);
}
+enum lttng_error_code lttng_create_session_ext(
+ struct lttng_session_descriptor *session_descriptor)
+{
+ enum lttng_error_code ret_code;
+ struct lttcomm_session_msg lsm = {
+ .cmd_type = LTTNG_CREATE_SESSION_EXT,
+ };
+ void *reply = NULL;
+ struct lttng_buffer_view reply_view;
+ int reply_ret;
+ bool sessiond_must_generate_ouput;
+ struct lttng_dynamic_buffer payload;
+ int ret;
+ size_t descriptor_size;
+ struct lttng_session_descriptor *descriptor_reply = NULL;
+
+ lttng_dynamic_buffer_init(&payload);
+ if (!session_descriptor) {
+ ret_code = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ sessiond_must_generate_ouput =
+ !lttng_session_descriptor_is_output_destination_initialized(
+ session_descriptor);
+ if (sessiond_must_generate_ouput) {
+ const char *home_dir = utils_get_home_dir();
+ size_t home_dir_len = home_dir ? strlen(home_dir) + 1 : 0;
+
+ if (!home_dir || home_dir_len > LTTNG_PATH_MAX) {
+ ret_code = LTTNG_ERR_FATAL;
+ goto end;
+ }
+
+ lsm.u.create_session.home_dir_size = (uint16_t) home_dir_len;
+ ret = lttng_dynamic_buffer_append(&payload, home_dir,
+ home_dir_len);
+ if (ret) {
+ ret_code = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+ }
+
+ descriptor_size = payload.size;
+ ret = lttng_session_descriptor_serialize(session_descriptor,
+ &payload);
+ if (ret) {
+ ret_code = LTTNG_ERR_INVALID;
+ goto end;
+ }
+ descriptor_size = payload.size - descriptor_size;
+ lsm.u.create_session.session_descriptor_size = descriptor_size;
+
+ /* Command returns a session descriptor on success. */
+ reply_ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, payload.data,
+ payload.size, &reply);
+ if (reply_ret < 0) {
+ ret_code = -reply_ret;
+ goto end;
+ } else if (reply_ret == 0) {
+ /* Socket unexpectedly closed by the session daemon. */
+ ret_code = LTTNG_ERR_FATAL;
+ goto end;
+ }
+
+ reply_view = lttng_buffer_view_init(reply, 0, reply_ret);
+ ret = lttng_session_descriptor_create_from_buffer(&reply_view,
+ &descriptor_reply);
+ if (ret < 0) {
+ ret_code = LTTNG_ERR_FATAL;
+ goto end;
+ }
+ ret_code = LTTNG_OK;
+ lttng_session_descriptor_assign(session_descriptor, descriptor_reply);
+end:
+ free(reply);
+ lttng_dynamic_buffer_reset(&payload);
+ lttng_session_descriptor_destroy(descriptor_reply);
+ return ret_code;
+}
+
/*
- * Create a brand new session using name and url for destination.
+ * Create a new session using name and url for destination.
*
* Returns LTTNG_OK on success or a negative error code.
*/
{
int ret;
ssize_t size;
- struct lttcomm_session_msg lsm;
struct lttng_uri *uris = NULL;
+ struct lttng_session_descriptor *descriptor = NULL;
+ enum lttng_error_code ret_code;
- if (name == NULL) {
- return -LTTNG_ERR_INVALID;
+ if (!name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
- memset(&lsm, 0, sizeof(lsm));
-
- 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 */
size = uri_parse_str_urls(url, NULL, &uris);
if (size < 0) {
- return -LTTNG_ERR_INVALID;
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
-
- lsm.u.uri.size = size;
-
- ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
- sizeof(struct lttng_uri) * size, NULL);
-
+ switch (size) {
+ case 0:
+ descriptor = lttng_session_descriptor_create(name);
+ break;
+ case 1:
+ if (uris[0].dtype != LTTNG_DST_PATH) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ descriptor = lttng_session_descriptor_local_create(name,
+ uris[0].dst.path);
+ break;
+ case 2:
+ descriptor = lttng_session_descriptor_network_create(name, url,
+ NULL);
+ break;
+ default:
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ if (!descriptor) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ ret_code = lttng_create_session_ext(descriptor);
+ ret = ret_code == LTTNG_OK ? 0 : -ret_code;
+end:
+ lttng_session_descriptor_destroy(descriptor);
free(uris);
return ret;
}
/*
- * Destroy session using name.
- * Returns size of returned session payload data or a negative error code.
+ * Create a session exclusively used for snapshot.
+ *
+ * Returns LTTNG_OK on success or a negative error code.
*/
-int _lttng_destroy_session(const char *session_name)
+int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
{
- struct lttcomm_session_msg lsm;
+ int ret;
+ enum lttng_error_code ret_code;
+ ssize_t size;
+ struct lttng_uri *uris = NULL;
+ struct lttng_session_descriptor *descriptor = NULL;
- if (session_name == NULL) {
- return -LTTNG_ERR_INVALID;
+ if (!name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_DESTROY_SESSION;
-
- lttng_ctl_copy_string(lsm.session.name, session_name,
- sizeof(lsm.session.name));
-
- return lttng_ctl_ask_sessiond(&lsm, NULL);
+ size = uri_parse_str_urls(snapshot_url, NULL, &uris);
+ if (size < 0) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ /*
+ * If the user does not specify a custom subdir, use the session name.
+ */
+ if (size > 0 && uris[0].dtype != LTTNG_DST_PATH &&
+ strlen(uris[0].subdir) == 0) {
+ ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s",
+ name);
+ if (ret < 0) {
+ PERROR("Failed to set session name as network destination sub-directory");
+ ret = -LTTNG_ERR_FATAL;
+ goto end;
+ } else if (ret >= sizeof(uris[0].subdir)) {
+ /* Truncated output. */
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ }
+
+ switch (size) {
+ case 0:
+ descriptor = lttng_session_descriptor_snapshot_create(name);
+ break;
+ case 1:
+ if (uris[0].dtype != LTTNG_DST_PATH) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ descriptor = lttng_session_descriptor_snapshot_local_create(
+ name,
+ uris[0].dst.path);
+ break;
+ case 2:
+ descriptor = lttng_session_descriptor_snapshot_network_create(
+ name,
+ snapshot_url,
+ NULL);
+ break;
+ default:
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ if (!descriptor) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ ret_code = lttng_create_session_ext(descriptor);
+ ret = ret_code == LTTNG_OK ? 0 : -ret_code;
+end:
+ lttng_session_descriptor_destroy(descriptor);
+ free(uris);
+ return ret;
+}
+
+/*
+ * Create a session exclusively used for live.
+ *
+ * Returns LTTNG_OK on success or a negative error code.
+ */
+int lttng_create_session_live(const char *name, const char *url,
+ unsigned int timer_interval)
+{
+ int ret;
+ enum lttng_error_code ret_code;
+ struct lttng_session_descriptor *descriptor = NULL;
+
+ if (!name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (url) {
+ descriptor = lttng_session_descriptor_live_network_create(
+ name, url, NULL, timer_interval);
+ } else {
+ descriptor = lttng_session_descriptor_live_create(
+ name, timer_interval);
+ }
+ if (!descriptor) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ ret_code = lttng_create_session_ext(descriptor);
+ ret = ret_code == LTTNG_OK ? 0 : -ret_code;
+end:
+ lttng_session_descriptor_destroy(descriptor);
+ return ret;
+}
+
+/*
+ * Destroy session using name.
+ * Returns size of returned session payload data or a negative error code.
+ */
+static
+int _lttng_destroy_session(const char *session_name)
+{
+ struct lttcomm_session_msg lsm;
+
+ if (session_name == NULL) {
+ return -LTTNG_ERR_INVALID;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_DESTROY_SESSION;
+
+ lttng_ctl_copy_string(lsm.session.name, session_name,
+ sizeof(lsm.session.name));
+
+ return lttng_ctl_ask_sessiond(&lsm, NULL);
}
/*
* Returns the number of lttng_session entries in sessions;
* on error, returns a negative value.
*/
-int lttng_list_sessions(struct lttng_session **sessions)
+int lttng_list_sessions(struct lttng_session **out_sessions)
{
int ret;
struct lttcomm_session_msg lsm;
+ const size_t session_size = sizeof(struct lttng_session) +
+ sizeof(struct lttng_session_extended);
+ size_t session_count, i;
+ struct lttng_session_extended *sessions_extended_begin;
+ struct lttng_session *sessions = NULL;
memset(&lsm, 0, sizeof(lsm));
lsm.cmd_type = LTTNG_LIST_SESSIONS;
- ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions);
- if (ret < 0) {
- return ret;
+ ret = lttng_ctl_ask_sessiond(&lsm, (void**) &sessions);
+ if (ret <= 0) {
+ goto end;
+ }
+ if (!sessions) {
+ ret = -LTTNG_ERR_FATAL;
+ goto end;
+ }
+
+ if (ret % session_size) {
+ ret = -LTTNG_ERR_UNK;
+ free(sessions);
+ *out_sessions = NULL;
+ goto end;
+ }
+ session_count = (size_t) ret / session_size;
+ sessions_extended_begin = (struct lttng_session_extended *)
+ (&sessions[session_count]);
+
+ /* Set extended session info pointers. */
+ for (i = 0; i < session_count; i++) {
+ struct lttng_session *session = &sessions[i];
+ struct lttng_session_extended *extended =
+ &(sessions_extended_begin[i]);
+
+ session->extended.ptr = extended;
+ }
+
+ ret = (int) session_count;
+ *out_sessions = sessions;
+end:
+ return ret;
+}
+
+enum lttng_error_code lttng_session_get_creation_time(
+ const struct lttng_session *session, uint64_t *creation_time)
+{
+ enum lttng_error_code ret = LTTNG_OK;
+ struct lttng_session_extended *extended;
+
+ if (!session || !creation_time || !session->extended.ptr) {
+ ret = LTTNG_ERR_INVALID;
+ goto end;
}
- return ret / sizeof(struct lttng_session);
+ extended = session->extended.ptr;
+ if (!extended->creation_time.is_set) {
+ /* Not created on the session daemon yet. */
+ ret = LTTNG_ERR_SESSION_NOT_EXIST;
+ goto end;
+ }
+ *creation_time = extended->creation_time.value;
+end:
+ return ret;
}
int lttng_set_session_shm_path(const char *session_name,
struct lttng_channel **channels)
{
int ret;
+ size_t channel_count, i;
+ const size_t channel_size = sizeof(struct lttng_channel) +
+ sizeof(struct lttng_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;
+ }
+
+ 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];
- return ret / sizeof(struct lttng_channel);
+ chan->attr.extended.ptr = extended_at;
+ extended_at += sizeof(struct lttng_channel_extended);
+ }
+
+ ret = (int) channel_count;
+end:
+ return ret;
}
/*
struct lttcomm_event_command_header *cmd_header = NULL;
size_t cmd_header_len;
uint32_t nb_events, i;
- void *extended_at;
+ void *comm_ext_at;
+ char *reception_buffer = NULL;
+ struct lttng_dynamic_buffer listing;
+ size_t storage_req;
/* Safety check. An handle and channel name are mandatory */
if (handle == NULL || channel_name == NULL) {
sizeof(lsm.u.list.channel_name));
lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
- ret = lttng_ctl_ask_sessiond_varlen(&lsm, NULL, 0, (void **) events,
- (void **) &cmd_header, &cmd_header_len);
+ ret = lttng_ctl_ask_sessiond_fds_varlen(&lsm, NULL, 0, NULL, 0,
+ (void **) &reception_buffer, (void **) &cmd_header,
+ &cmd_header_len);
if (ret < 0) {
- goto error;
+ goto end;
+ }
+
+ if (!cmd_header) {
+ ret = -LTTNG_ERR_UNK;
+ goto end;
}
/* Set number of events and free command header */
nb_events = cmd_header->nb_events;
if (nb_events > INT_MAX) {
ret = -EOVERFLOW;
- goto error;
+ goto end;
}
- ret = (int) nb_events;
free(cmd_header);
cmd_header = NULL;
- /* Set extended info pointers */
- extended_at = ((void*) (*events)) +
- nb_events * sizeof(struct lttng_event);
+ /*
+ * The buffer that is returned must contain a "flat" version of
+ * the events that are returned. In other words, all pointers
+ * within an lttng_event must point to a location within the returned
+ * buffer so that the user may free everything by simply calling free()
+ * on the returned buffer. This is needed in order to maintain API
+ * compatibility.
+ *
+ * A first pass is performed to compute the size of the buffer that
+ * must be allocated. A second pass is then performed to setup
+ * the returned events so that their members always point within the
+ * buffer.
+ *
+ * The layout of the returned buffer is as follows:
+ * - struct lttng_event[nb_events],
+ * - nb_events times the following:
+ * - struct lttng_event_extended,
+ * - flattened version of userspace_probe_location
+ * - filter_expression
+ * - exclusions
+ * - padding to align to 64-bits
+ */
+ comm_ext_at = reception_buffer +
+ (nb_events * sizeof(struct lttng_event));
+ storage_req = 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];
+ struct lttcomm_event_extended_header *ext_comm =
+ (struct lttcomm_event_extended_header *) comm_ext_at;
+ int probe_storage_req = 0;
+
+ comm_ext_at += sizeof(*ext_comm);
+ comm_ext_at += ext_comm->filter_len;
+ comm_ext_at +=
+ ext_comm->nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
+
+ if (ext_comm->userspace_probe_location_len) {
+ struct lttng_userspace_probe_location *probe_location = NULL;
+ struct lttng_buffer_view probe_location_view;
+
+ probe_location_view = lttng_buffer_view_init(
+ comm_ext_at, 0,
+ ext_comm->userspace_probe_location_len);
+
+ /*
+ * Create a temporary userspace probe location to
+ * determine the size needed by a "flattened" version
+ * of that same probe location.
+ */
+ ret = lttng_userspace_probe_location_create_from_buffer(
+ &probe_location_view, &probe_location);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto end;
+ }
+
+ ret = lttng_userspace_probe_location_flatten(
+ probe_location, NULL);
+ lttng_userspace_probe_location_destroy(probe_location);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto end;
+ }
+
+ probe_storage_req = ret;
+ comm_ext_at += ext_comm->userspace_probe_location_len;
+ }
- 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;
+ storage_req += sizeof(struct lttng_event_extended);
+ storage_req += ext_comm->filter_len;
+ storage_req += ext_comm->nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
+ /* Padding to ensure the flat probe is aligned. */
+ storage_req = ALIGN_TO(storage_req, sizeof(uint64_t));
+ storage_req += probe_storage_req;
}
- return ret;
-error:
+ lttng_dynamic_buffer_init(&listing);
+ /*
+ * We must ensure that "listing" is never resized so as to preserve
+ * the validity of the flattened objects.
+ */
+ ret = lttng_dynamic_buffer_set_capacity(&listing, storage_req);
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ ret = lttng_dynamic_buffer_append(&listing, reception_buffer,
+ nb_events * sizeof(struct lttng_event));
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+
+ comm_ext_at = reception_buffer +
+ (nb_events * sizeof(struct lttng_event));
+ for (i = 0; i < nb_events; i++) {
+ struct lttng_event *event = (struct lttng_event *)
+ (listing.data + (sizeof(struct lttng_event) * i));
+ struct lttcomm_event_extended_header *ext_comm =
+ (struct lttcomm_event_extended_header *) comm_ext_at;
+ struct lttng_event_extended *event_extended =
+ (struct lttng_event_extended *)
+ (listing.data + listing.size);
+
+ /* Insert struct lttng_event_extended. */
+ ret = lttng_dynamic_buffer_set_size(&listing,
+ listing.size + sizeof(*event_extended));
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+ event->extended.ptr = event_extended;
+
+ comm_ext_at += sizeof(*ext_comm);
+
+ /* Insert filter expression. */
+ if (ext_comm->filter_len) {
+ event_extended->filter_expression = listing.data +
+ listing.size;
+ ret = lttng_dynamic_buffer_append(&listing, comm_ext_at,
+ ext_comm->filter_len);
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+ comm_ext_at += ext_comm->filter_len;
+ }
+
+ /* Insert exclusions. */
+ if (ext_comm->nb_exclusions) {
+ event_extended->exclusions.count =
+ ext_comm->nb_exclusions;
+ event_extended->exclusions.strings =
+ listing.data + listing.size;
+
+ ret = lttng_dynamic_buffer_append(&listing,
+ comm_ext_at,
+ ext_comm->nb_exclusions * LTTNG_SYMBOL_NAME_LEN);
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+ comm_ext_at += ext_comm->nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
+ }
+
+ /* Insert padding to align to 64-bits. */
+ ret = lttng_dynamic_buffer_set_size(&listing,
+ ALIGN_TO(listing.size, sizeof(uint64_t)));
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+
+ /* Insert flattened userspace probe location. */
+ if (ext_comm->userspace_probe_location_len) {
+ struct lttng_userspace_probe_location *probe_location = NULL;
+ struct lttng_buffer_view probe_location_view;
+
+ probe_location_view = lttng_buffer_view_init(
+ comm_ext_at, 0,
+ ext_comm->userspace_probe_location_len);
+
+ ret = lttng_userspace_probe_location_create_from_buffer(
+ &probe_location_view, &probe_location);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto free_dynamic_buffer;
+ }
+
+ event_extended->probe_location = (struct lttng_userspace_probe_location *)
+ (listing.data + listing.size);
+ ret = lttng_userspace_probe_location_flatten(
+ probe_location, &listing);
+ lttng_userspace_probe_location_destroy(probe_location);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto free_dynamic_buffer;
+ }
+
+ comm_ext_at += ext_comm->userspace_probe_location_len;
+ }
+ }
+
+ /* Don't reset listing buffer as we return its content. */
+ *events = (struct lttng_event *) listing.data;
+ lttng_dynamic_buffer_init(&listing);
+ ret = (int) nb_events;
+free_dynamic_buffer:
+ lttng_dynamic_buffer_reset(&listing);
+end:
free(cmd_header);
- free(*events);
+ free(reception_buffer);
return ret;
}
-
/*
* Sets the tracing_group variable with name.
* This function allocates memory pointed to by tracing_group.
return 0;
}
-/*
- * Returns size of returned session payload data or a negative error code.
- */
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 -LTTNG_ERR_INVALID;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_CALIBRATE;
- lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
-
- memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
-
- return lttng_ctl_ask_sessiond(&lsm, NULL);
+ /*
+ * This command was removed in LTTng 2.9.
+ */
+ return -LTTNG_ERR_UND;
}
/*
void lttng_channel_set_default_attr(struct lttng_domain *domain,
struct lttng_channel_attr *attr)
{
+ struct lttng_channel_extended *extended;
+
/* Safety check */
if (attr == NULL || domain == NULL) {
return;
}
+ extended = (struct lttng_channel_extended *) attr->extended.ptr;
memset(attr, 0, sizeof(struct lttng_channel_attr));
/* Same for all domains. */
attr->subbuf_size = default_get_kernel_channel_subbuf_size();
attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
+ if (extended) {
+ extended->monitor_timer_interval =
+ DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER;
+ extended->blocking_timeout =
+ DEFAULT_KERNEL_CHANNEL_BLOCKING_TIMEOUT;
+ }
break;
case LTTNG_DOMAIN_UST:
switch (domain->buf_type) {
DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
attr->read_timer_interval =
DEFAULT_UST_UID_CHANNEL_READ_TIMER;
+ if (extended) {
+ extended->monitor_timer_interval =
+ DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER;
+ extended->blocking_timeout =
+ DEFAULT_UST_UID_CHANNEL_BLOCKING_TIMEOUT;
+ }
break;
case LTTNG_BUFFER_PER_PID:
default:
DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
attr->read_timer_interval =
DEFAULT_UST_PID_CHANNEL_READ_TIMER;
+ if (extended) {
+ extended->monitor_timer_interval =
+ DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER;
+ extended->blocking_timeout =
+ DEFAULT_UST_PID_CHANNEL_BLOCKING_TIMEOUT;
+ }
break;
}
default:
/* Default behavior: leave set to 0. */
break;
}
+
+ attr->extended.ptr = extended;
+}
+
+int lttng_channel_get_discarded_event_count(struct lttng_channel *channel,
+ uint64_t *discarded_events)
+{
+ int ret = 0;
+ struct lttng_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 lttng_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;
+}
+
+int lttng_channel_get_monitor_timer_interval(struct lttng_channel *chan,
+ uint64_t *monitor_timer_interval)
+{
+ int ret = 0;
+
+ if (!chan || !monitor_timer_interval) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (!chan->attr.extended.ptr) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ *monitor_timer_interval = ((struct lttng_channel_extended *)
+ chan->attr.extended.ptr)->monitor_timer_interval;
+end:
+ return ret;
+}
+
+int lttng_channel_set_monitor_timer_interval(struct lttng_channel *chan,
+ uint64_t monitor_timer_interval)
+{
+ int ret = 0;
+
+ if (!chan || !chan->attr.extended.ptr) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ((struct lttng_channel_extended *)
+ chan->attr.extended.ptr)->monitor_timer_interval =
+ monitor_timer_interval;
+end:
+ return ret;
+}
+
+int lttng_channel_get_blocking_timeout(struct lttng_channel *chan,
+ int64_t *blocking_timeout)
+{
+ int ret = 0;
+
+ if (!chan || !blocking_timeout) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (!chan->attr.extended.ptr) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ *blocking_timeout = ((struct lttng_channel_extended *)
+ chan->attr.extended.ptr)->blocking_timeout;
+end:
+ return ret;
+}
+
+int lttng_channel_set_blocking_timeout(struct lttng_channel *chan,
+ int64_t blocking_timeout)
+{
+ int ret = 0;
+ int64_t msec_timeout;
+
+ if (!chan || !chan->attr.extended.ptr) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (blocking_timeout < 0 && blocking_timeout != -1) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /*
+ * LTTng-ust's use of poll() to implement this timeout mechanism forces
+ * us to accept a narrower range of values (msecs expressed as a signed
+ * 32-bit integer).
+ */
+ msec_timeout = blocking_timeout / 1000;
+ if (msec_timeout != (int32_t) msec_timeout) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ((struct lttng_channel_extended *)
+ chan->attr.extended.ptr)->blocking_timeout =
+ blocking_timeout;
+end:
+ return ret;
}
/*
}
/*
- * This is an extension of create session that is ONLY and SHOULD only be used
- * by the lttng command line program. It exists to avoid using URI parsing in
- * the lttng client.
- *
- * We need the date and time for the trace path subdirectory for the case where
- * the user does NOT define one using either -o or -U. Using the normal
- * lttng_create_session API call, we have no clue on the session daemon side if
- * the URL was generated automatically by the client or define by the user.
- *
- * So this function "wrapper" is hidden from the public API, takes the datetime
- * string and appends it if necessary to the URI subdirectory before sending it
- * to the session daemon.
- *
- * With this extra function, the lttng_create_session call behavior is not
- * changed and the timestamp is appended to the URI on the session daemon side
- * if necessary.
+ * [OBSOLETE]
*/
int _lttng_create_session_ext(const char *name, const char *url,
const char *datetime)
{
- int ret;
- ssize_t size;
- struct lttcomm_session_msg lsm;
- struct lttng_uri *uris = NULL;
-
- if (name == NULL || datetime == NULL) {
- return -LTTNG_ERR_INVALID;
- }
-
- memset(&lsm, 0, sizeof(lsm));
-
- 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. */
- size = uri_parse_str_urls(url, NULL, &uris);
- if (size < 0) {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- lsm.u.uri.size = size;
-
- if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
- /* Don't append datetime if the name was automatically created. */
- if (strncmp(name, DEFAULT_SESSION_NAME "-",
- strlen(DEFAULT_SESSION_NAME) + 1)) {
- ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s",
- name, datetime);
- } else {
- ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name);
- }
- if (ret < 0) {
- PERROR("snprintf uri subdir");
- ret = -LTTNG_ERR_FATAL;
- goto error;
- }
- }
-
- ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
- sizeof(struct lttng_uri) * size, NULL);
-
-error:
- free(uris);
- return ret;
+ return -ENOSYS;
}
/*
}
/*
- * Create a session exclusively used for snapshot.
+ * List PIDs in the tracker.
*
- * Returns LTTNG_OK on success or a negative error code.
+ * 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_create_session_snapshot(const char *name, const char *snapshot_url)
+int lttng_list_tracker_pids(struct lttng_handle *handle,
+ int *_enabled, int32_t **_pids, size_t *_nr_pids)
{
int ret;
- ssize_t size;
+ int enabled = 1;
struct lttcomm_session_msg lsm;
- struct lttng_uri *uris = NULL;
+ size_t nr_pids;
+ int32_t *pids = NULL;
- if (name == NULL) {
+ 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);
- lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT;
- lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
+ ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pids);
+ if (ret < 0) {
+ return ret;
+ }
+ nr_pids = ret / sizeof(int32_t);
+ if (nr_pids > 0 && !pids) {
+ return -LTTNG_ERR_UNK;
+ }
+ 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;
+}
- size = uri_parse_str_urls(snapshot_url, NULL, &uris);
- if (size < 0) {
- return -LTTNG_ERR_INVALID;
+/*
+ * Regenerate the metadata for a session.
+ * Return 0 on success, a negative error code on error.
+ */
+int lttng_regenerate_metadata(const char *session_name)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ if (!session_name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
- lsm.u.uri.size = size;
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_REGENERATE_METADATA;
- ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
- sizeof(struct lttng_uri) * size, NULL);
+ lttng_ctl_copy_string(lsm.session.name, session_name,
+ sizeof(lsm.session.name));
- free(uris);
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+ if (ret < 0) {
+ goto end;
+ }
+
+ ret = 0;
+end:
return ret;
}
/*
- * Create a session exclusively used for live.
- *
- * Returns LTTNG_OK on success or a negative error code.
+ * Deprecated, replaced by lttng_regenerate_metadata.
*/
-int lttng_create_session_live(const char *name, const char *url,
- unsigned int timer_interval)
+int lttng_metadata_regenerate(const char *session_name)
+{
+ return lttng_regenerate_metadata(session_name);
+}
+
+/*
+ * Regenerate the statedump of a session.
+ * Return 0 on success, a negative error code on error.
+ */
+int lttng_regenerate_statedump(const char *session_name)
{
int ret;
- ssize_t size;
struct lttcomm_session_msg lsm;
- struct lttng_uri *uris = NULL;
- if (name == NULL || timer_interval == 0) {
- return -LTTNG_ERR_INVALID;
+ if (!session_name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_REGENERATE_STATEDUMP;
- lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE;
- lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name));
+ lttng_ctl_copy_string(lsm.session.name, session_name,
+ sizeof(lsm.session.name));
- if (url) {
- size = uri_parse_str_urls(url, NULL, &uris);
- if (size <= 0) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+ if (ret < 0) {
+ goto end;
+ }
- /* file:// is not accepted for live session. */
- if (uris[0].dtype == LTTNG_DST_PATH) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
- } else {
- size = 0;
+ ret = 0;
+end:
+ return ret;
+}
+
+int lttng_register_trigger(struct lttng_trigger *trigger)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+ struct lttng_dynamic_buffer buffer;
+
+ lttng_dynamic_buffer_init(&buffer);
+ if (!trigger) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
- lsm.u.session_live.nb_uri = size;
- lsm.u.session_live.timer_interval = timer_interval;
+ if (!lttng_trigger_validate(trigger)) {
+ ret = -LTTNG_ERR_INVALID_TRIGGER;
+ goto end;
+ }
- ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
- sizeof(struct lttng_uri) * size, NULL);
+ ret = lttng_trigger_serialize(trigger, &buffer);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_UNK;
+ goto end;
+ }
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_REGISTER_TRIGGER;
+ lsm.u.trigger.length = (uint32_t) buffer.size;
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, buffer.data,
+ buffer.size, NULL);
end:
- free(uris);
+ lttng_dynamic_buffer_reset(&buffer);
return ret;
}
-/*
- * 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 lttng_unregister_trigger(struct lttng_trigger *trigger)
{
int ret;
- int enabled = 1;
struct lttcomm_session_msg lsm;
- size_t nr_pids;
- int32_t *pids;
+ struct lttng_dynamic_buffer buffer;
- if (handle == NULL) {
- return -LTTNG_ERR_INVALID;
+ lttng_dynamic_buffer_init(&buffer);
+ if (!trigger) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
- 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);
+ if (!lttng_trigger_validate(trigger)) {
+ ret = -LTTNG_ERR_INVALID_TRIGGER;
+ goto end;
+ }
- ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pids);
+ ret = lttng_trigger_serialize(trigger, &buffer);
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;
+ ret = -LTTNG_ERR_UNK;
+ goto end;
}
- *_enabled = enabled;
- *_pids = pids;
- *_nr_pids = nr_pids;
- return 0;
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_UNREGISTER_TRIGGER;
+ lsm.u.trigger.length = (uint32_t) buffer.size;
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, buffer.data,
+ buffer.size, NULL);
+end:
+ lttng_dynamic_buffer_reset(&buffer);
+ return ret;
}
/*
* lib constructor.
*/
-static void __attribute__((constructor)) init()
+static void __attribute__((constructor)) init(void)
{
/* Set default session group */
lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
/*
* lib destructor.
*/
-static void __attribute__((destructor)) lttng_ctl_exit()
+static void __attribute__((destructor)) lttng_ctl_exit(void)
{
free(tracing_group);
}
projects / lttng-tools.git / blobdiff