X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=ltt-sessiond%2Ftrace.c;h=9a3c95956439e08a462b8e1e21f25ed050359a08;hb=d4a1283e471c152cedf6cb5ebcc74d509009145d;hp=c5d700fd1450b17d842c20a93eef220d75e83d5d;hpb=1657e9bb835a28e66396deac871270fe373d5ff4;p=lttng-tools.git

diff --git a/ltt-sessiond/trace.c b/ltt-sessiond/trace.c
index c5d700fd1..9a3c95956 100644
--- a/ltt-sessiond/trace.c
+++ b/ltt-sessiond/trace.c
@@ -23,10 +23,16 @@
 #include <stdlib.h>
 #include <string.h>
 #include <urcu/list.h>
+#include <ust/ustctl.h>
 
+#include "liblttsessiondcomm.h"
 #include "lttngerr.h"
 #include "trace.h"
 #include "session.h"
+#include "ltt-sessiond.h"
+
+static struct ltt_ust_trace *find_session_ust_trace_by_pid(
+		struct ltt_session *session, pid_t pid);
 
 /*
  *  find_session_ust_trace_by_pid
@@ -34,7 +40,8 @@
  *  Iterate over the session ust_traces and
  *  return a pointer or NULL if not found.
  */
-struct ltt_ust_trace *find_session_ust_trace_by_pid(struct ltt_session *session, pid_t pid)
+static struct ltt_ust_trace *find_session_ust_trace_by_pid(
+		struct ltt_session *session, pid_t pid)
 {
 	struct ltt_ust_trace *iter;
 
@@ -97,3 +104,116 @@ void get_traces_per_session(struct ltt_session *session, struct lttng_trace *tra
 		i++;
 	}
 }
+
+/*
+ *  ust_create_trace
+ *
+ *  Create an userspace trace using pid.
+ *  This trace is then appended to the current session
+ *  ust trace list.
+ */
+int ust_create_trace(struct command_ctx *cmd_ctx)
+{
+	int ret;
+	struct ltt_ust_trace *trace;
+
+	DBG("Creating trace for pid %d", cmd_ctx->lsm->pid);
+
+	trace = malloc(sizeof(struct ltt_ust_trace));
+	if (trace == NULL) {
+		perror("malloc");
+		ret = -1;
+		goto error;
+	}
+
+	/* Init */
+	trace->pid = cmd_ctx->lsm->pid;
+	trace->shmid = 0;
+	/* NOTE: to be removed. Trace name will no longer be
+	 * required for LTTng userspace tracer. For now, we set it
+	 * to 'auto' for API compliance.
+	 */
+	snprintf(trace->name, 5, "auto");
+
+	ret = ustctl_create_trace(cmd_ctx->ust_sock, trace->name);
+	if (ret < 0) {
+		ret = LTTCOMM_CREATE_FAIL;
+		goto error_create;
+	}
+
+	/* Check if current session is valid */
+	if (cmd_ctx->session) {
+		cds_list_add(&trace->list, &cmd_ctx->session->ust_traces);
+		cmd_ctx->session->ust_trace_count++;
+	}
+
+	return LTTCOMM_OK;
+
+error_create:
+	free(trace);
+error:
+	return ret;
+}
+
+/*
+ *  ust_start_trace
+ *
+ *  Start a trace. This trace, identified by the pid, must be
+ *  in the current session ust_traces list.
+ */
+int ust_start_trace(struct command_ctx *cmd_ctx)
+{
+	int ret;
+	struct ltt_ust_trace *trace;
+
+	DBG("Starting trace for pid %d", cmd_ctx->lsm->pid);
+
+	trace = find_session_ust_trace_by_pid(cmd_ctx->session, cmd_ctx->lsm->pid);
+	if (trace == NULL) {
+		ret = LTTCOMM_NO_TRACE;
+		goto error;
+	}
+
+	ret = ustctl_start_trace(cmd_ctx->ust_sock, "auto");
+	if (ret < 0) {
+		ret = LTTCOMM_START_FAIL;
+		goto error;
+	}
+
+	ret = LTTCOMM_OK;
+
+error:
+	return ret;
+}
+
+/*
+ *  ust_stop_trace
+ *
+ *  Stop a trace. This trace, identified by the pid, must be
+ *  in the current session ust_traces list.
+ */
+int ust_stop_trace(struct command_ctx *cmd_ctx)
+{
+	int ret;
+	struct ltt_ust_trace *trace;
+
+	DBG("Stopping trace for pid %d", cmd_ctx->lsm->pid);
+
+	trace = find_session_ust_trace_by_pid(cmd_ctx->session, cmd_ctx->lsm->pid);
+	if (trace == NULL) {
+		ret = LTTCOMM_NO_TRACE;
+		goto error;
+	}
+
+	ret = ustctl_stop_trace(cmd_ctx->ust_sock, trace->name);
+	if (ret < 0) {
+		ret = LTTCOMM_STOP_FAIL;
+		goto error;
+	}
+
+	ret = LTTCOMM_OK;
+
+error:
+	return ret;
+}
+