Add application context support to lttng-ctl lttng_add_context

[lttng-tools.git] / src / bin / lttng-sessiond / main.c

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index 5d098d7689a10e8b80417e92ea2da7efd85f5eb2..7a8b5ae42dcfedb4c7af6a159997d3eaa98dd02f 100644 (file)
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -17,7 +17,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#define _GNU_SOURCE
 #define _LGPL_SOURCE
 #include <getopt.h>
 #include <grp.h>
@@ -38,7 +37,6 @@
 #include <sys/wait.h>
 #include <urcu/uatomic.h>
 #include <unistd.h>
-#include <config.h>
 
 #include <common/common.h>
 #include <common/compat/socket.h>
@@ -49,7 +47,7 @@
 #include <common/relayd/relayd.h>
 #include <common/utils.h>
 #include <common/daemonize.h>
-#include <common/config/config.h>
+#include <common/config/session-config.h>
 
 #include "lttng-sessiond.h"
 #include "buffer-registry.h"
@@ -3345,9 +3343,74 @@ skip_domain:
        switch (cmd_ctx->lsm->cmd_type) {
        case LTTNG_ADD_CONTEXT:
        {
-               ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
+               /*
+                * An LTTNG_ADD_CONTEXT command might have a supplementary
+                * payload if the context being added is an application context.
+                */
+               if (cmd_ctx->lsm->u.context.ctx.ctx ==
+                               LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
+                       char *provider_name = NULL, *context_name = NULL;
+                       size_t provider_name_len =
+                                       cmd_ctx->lsm->u.context.provider_name_len;
+                       size_t context_name_len =
+                                       cmd_ctx->lsm->u.context.context_name_len;
+
+                       if (provider_name_len == 0 || context_name_len == 0) {
+                               /*
+                                * Application provider and context names MUST
+                                * be provided.
+                                */
+                               ret = -LTTNG_ERR_INVALID;
+                               goto error;
+                       }
+
+                       provider_name = zmalloc(provider_name_len + 1);
+                       if (!provider_name) {
+                               ret = -LTTNG_ERR_NOMEM;
+                               goto error;
+                       }
+
+                       context_name = zmalloc(context_name_len + 1);
+                       if (!context_name) {
+                               ret = -LTTNG_ERR_NOMEM;
+                               goto error_add_context;
+                       }
+
+                       ret = lttcomm_recv_unix_sock(sock, provider_name,
+                                       provider_name_len);
+                       if (ret < 0) {
+                               goto error_add_context;
+                       }
+
+                       ret = lttcomm_recv_unix_sock(sock, context_name,
+                                       context_name_len);
+                       if (ret < 0) {
+                               goto error_add_context;
+                       }
+                       cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name =
+                                       provider_name;
+                       cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name =
+                                       context_name;
+               }
+
+               /*
+                * cmd_add_context assumes ownership of the provider and context
+                * names.
+                */
+               ret = cmd_add_context(cmd_ctx->session,
+                               cmd_ctx->lsm->domain.type,
                                cmd_ctx->lsm->u.context.channel_name,
-                               &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]);
+                               &cmd_ctx->lsm->u.context.ctx,
+                               kernel_poll_pipe[1]);
+
+               cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL;
+               cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL;
+error_add_context:
+               free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name);
+               free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name);
+               if (ret < 0) {
+                       goto error;
+               }
                break;
        }
        case LTTNG_DISABLE_CHANNEL:
@@ -4903,7 +4966,7 @@ end:
 
 /*
  * config_entry_handler_cb used to handle options read from a config file.
- * See config_entry_handler_cb comment in common/config/config.h for the
+ * See config_entry_handler_cb comment in common/config/session-config.h for the
  * return value conventions.
  */
 static int config_entry_handler(const struct config_entry *entry, void *unused)
@@ -6136,11 +6199,12 @@ exit_health_sessiond_cleanup:
 exit_create_run_as_worker_cleanup:
 
 exit_options:
+       /* Ensure all prior call_rcu are done. */
+       rcu_barrier();
+
        sessiond_cleanup_options();
 
 exit_set_signal_handler:
-       /* Ensure all prior call_rcu are done. */
-       rcu_barrier();
 
        if (!retval) {
                exit(EXIT_SUCCESS);