X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=ltt-sessiond%2Fmain.c;h=88a43d9683975d5c4657e977b16662a869177699;hp=de601b6f86746ba295b50ba335b44eb68acf537b;hb=6aea26bc854e8090e609502e53a3e2923cb3b2c5;hpb=847177cda88eed885da0b5f0b66b03ffcd06c8f6

diff --git a/ltt-sessiond/main.c b/ltt-sessiond/main.c
index de601b6f8..88a43d968 100644
--- a/ltt-sessiond/main.c
+++ b/ltt-sessiond/main.c
@@ -40,6 +40,7 @@
 #include "liblttsessiondcomm.h"
 #include "ltt-sessiond.h"
 #include "lttngerr.h"
+#include "kernel-ctl.h"
 #include "session.h"
 #include "trace.h"
 #include "traceable-app.h"
@@ -95,6 +96,7 @@ static char kconsumerd_cmd_unix_sock_path[PATH_MAX];	/* kconsumerd command Unix
 static int client_sock;
 static int apps_sock;
 static int kconsumerd_err_sock;
+static int kernel_tracer_fd;
 
 /*
  *  thread_manage_kconsumerd
@@ -160,6 +162,7 @@ static void *thread_manage_apps(void *data)
 	notify_apps(default_global_apps_pipe);
 
 	while (1) {
+		DBG("Accepting application registration");
 		/* Blocking call, waiting for transmission */
 		sock = lttcomm_accept_unix_sock(apps_sock);
 		if (sock < 0) {
@@ -263,7 +266,8 @@ static void *thread_manage_clients(void *data)
 			continue;
 		}
 
-		DBG("Sending response to client (size: %d)", cmd_ctx->lttng_msg_size);
+		DBG("Sending response (size: %d, retcode: %d)",
+				cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code);
 		ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
 		if (ret < 0) {
 			ERR("Failed to send data back to client");
@@ -453,6 +457,17 @@ static int process_client_msg(struct command_ctx *cmd_ctx)
 		break;
 	}
 
+	/* Check command for kernel tracing */
+	switch (cmd_ctx->lsm->cmd_type) {
+	case KERNEL_CREATE_SESSION:
+	case KERNEL_CREATE_CHANNEL:
+		if (kernel_tracer_fd == 0) {
+			ret = LTTCOMM_KERN_NA;
+			goto error;
+		}
+		break;
+	}
+
 	/* Connect to ust apps if available pid */
 	if (cmd_ctx->lsm->pid > 0) {
 		/* Connect to app using ustctl API */
@@ -465,6 +480,61 @@ static int process_client_msg(struct command_ctx *cmd_ctx)
 
 	/* Process by command type */
 	switch (cmd_ctx->lsm->cmd_type) {
+	case KERNEL_CREATE_SESSION:
+	{
+		ret = setup_lttng_msg(cmd_ctx, 0);
+		if (ret < 0) {
+			goto setup_error;
+		}
+
+		DBG("Creating kernel session");
+
+		ret = kernel_create_session(cmd_ctx, kernel_tracer_fd);
+		if (ret < 0) {
+			ret = LTTCOMM_KERN_SESS_FAIL;
+			goto error;
+		}
+
+		ret = LTTCOMM_OK;
+		break;
+	}
+	case KERNEL_CREATE_CHANNEL:
+	{
+		ret = setup_lttng_msg(cmd_ctx, 0);
+		if (ret < 0) {
+			goto setup_error;
+		}
+
+		DBG("Creating kernel session");
+
+		ret = kernel_create_channel(cmd_ctx);
+		if (ret < 0) {
+			ret = LTTCOMM_KERN_CHAN_FAIL;
+			goto error;
+		}
+
+		ret = LTTCOMM_OK;
+		break;
+	}
+	case KERNEL_ENABLE_EVENT:
+	{
+		/* Setup lttng message with no payload */
+		ret = setup_lttng_msg(cmd_ctx, 0);
+		if (ret < 0) {
+			goto setup_error;
+		}
+
+		DBG("Enabling kernel event %s", cmd_ctx->lsm->u.event.event_name);
+
+		ret = kernel_enable_event(cmd_ctx->session->kernel_session->channel, cmd_ctx->lsm->u.event.event_name);
+		if (ret < 0) {
+			ret = LTTCOMM_KERN_ENABLE_FAIL;
+			goto error;
+		}
+
+		ret = LTTCOMM_OK;
+		break;
+	}
 	case LTTNG_CREATE_SESSION:
 	{
 		/* Setup lttng message with no payload */
@@ -624,12 +694,9 @@ static int process_client_msg(struct command_ctx *cmd_ctx)
 	return ret;
 
 error:
-	DBG("Return code to client %d", ret);
-
 	if (cmd_ctx->llm == NULL) {
 		DBG("Missing llm structure. Allocating one.");
-		ret = setup_lttng_msg(cmd_ctx, 0);
-		if (ret < 0) {
+		if (setup_lttng_msg(cmd_ctx, 0) < 0) {
 			goto setup_error;
 		}
 	}
@@ -897,6 +964,21 @@ error:
 	return ret;
 }
 
+/*
+ *  init_kernel_tracer
+ *
+ *  Setup necessary data for kernel tracer action.
+ */
+static void init_kernel_tracer(void)
+{
+	/* Set the global kernel tracer fd */
+	kernel_tracer_fd = open(DEFAULT_KERNEL_TRACER_PATH, O_RDWR);
+	if (kernel_tracer_fd < 0) {
+		WARN("No kernel tracer available");
+		kernel_tracer_fd = 0;
+	}
+}
+
 /*
  *  set_kconsumerd_sockets
  *
@@ -1089,6 +1171,9 @@ int main(int argc, char **argv)
 		if (ret < 0) {
 			goto error;
 		}
+
+		/* Setup kernel tracer */
+		init_kernel_tracer();
 	} else {
 		if (strlen(apps_unix_sock_path) == 0) {
 			snprintf(apps_unix_sock_path, PATH_MAX,