X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;ds=sidebyside;f=liblttng-ust%2Flttng-ust-comm.c;h=4724fabc0d6a72cf57923cea7e6da44d94563052;hb=246be17ec5a99beae7cc40eede54b4958958d8fb;hp=bf2750c2dcd5700d7053e53667ff7c3bb2430433;hpb=75582b3a56366b73ba1f656e03fc8df4a991ac45;p=lttng-ust.git

diff --git a/liblttng-ust/lttng-ust-comm.c b/liblttng-ust/lttng-ust-comm.c
index bf2750c2..4724fabc 100644
--- a/liblttng-ust/lttng-ust-comm.c
+++ b/liblttng-ust/lttng-ust-comm.c
@@ -34,6 +34,7 @@
 #include <time.h>
 #include <assert.h>
 #include <signal.h>
+#include <dlfcn.h>
 #include <urcu/uatomic.h>
 #include <urcu/futex.h>
 #include <urcu/compiler.h>
@@ -51,6 +52,7 @@
 #include "lttng-tracer-core.h"
 #include "compat.h"
 #include "../libringbuffer/tlsfixup.h"
+#include "lttng-ust-baddr.h"
 
 /*
  * Has lttng ust comm constructor been called ?
@@ -106,6 +108,7 @@ struct sock_info {
 
 	char wait_shm_path[PATH_MAX];
 	char *wait_shm_mmap;
+	int session_enabled;
 };
 
 /* Socket from app (connect) to session daemon (listen) for communication */
@@ -122,6 +125,8 @@ struct sock_info global_apps = {
 	.notify_socket = -1,
 
 	.wait_shm_path = "/" LTTNG_UST_WAIT_FILENAME,
+
+	.session_enabled = 0,
 };
 
 /* TODO: allow global_apps_sock_path override */
@@ -135,6 +140,8 @@ struct sock_info local_apps = {
 
 	.socket = -1,
 	.notify_socket = -1,
+
+	.session_enabled = 0,
 };
 
 static int wait_poll_fallback;
@@ -488,6 +495,68 @@ int handle_message(struct sock_info *sock_info,
 		}
 		break;
 	}
+	case LTTNG_UST_EXCLUSION:
+	{
+		/* Receive exclusion names */
+		struct lttng_ust_excluder_node *node;
+		unsigned int count;
+
+		count = lum->u.exclusion.count;
+		if (count == 0) {
+			/* There are no names to read */
+			ret = 0;
+			goto error;
+		}
+		node = zmalloc(sizeof(*node) +
+				count * LTTNG_UST_SYM_NAME_LEN);
+		if (!node) {
+			ret = -ENOMEM;
+			goto error;
+		}
+		node->excluder.count = count;
+		len = ustcomm_recv_unix_sock(sock, node->excluder.names,
+				count * LTTNG_UST_SYM_NAME_LEN);
+		switch (len) {
+		case 0:	/* orderly shutdown */
+			ret = 0;
+			free(node);
+			goto error;
+		default:
+			if (len == count * LTTNG_UST_SYM_NAME_LEN) {
+				DBG("Exclusion data received");
+				break;
+			} else if (len < 0) {
+				DBG("Receive failed from lttng-sessiond with errno %d", (int) -len);
+				if (len == -ECONNRESET) {
+					ERR("%s remote end closed connection", sock_info->name);
+					ret = len;
+					free(node);
+					goto error;
+				}
+				ret = len;
+				free(node);
+				goto end;
+			} else {
+				DBG("Incorrect exclusion data message size: %zd", len);
+				ret = -EINVAL;
+				free(node);
+				goto end;
+			}
+		}
+		if (ops->cmd) {
+			ret = ops->cmd(lum->handle, lum->cmd,
+					(unsigned long) node,
+					&args, sock_info);
+			if (ret) {
+				free(node);
+			}
+			/* Don't free exclusion data if everything went fine. */
+		} else {
+			ret = -ENOSYS;
+			free(node);
+		}
+		break;
+	}
 	case LTTNG_UST_CHANNEL:
 	{
 		void *chan_data;
@@ -639,6 +708,17 @@ error:
 	return ret;
 }
 
+static
+void handle_pending_statedumps(struct sock_info *sock_info)
+{
+	int ctor_passed = sock_info->constructor_sem_posted;
+
+	if (ctor_passed && sock_info->session_enabled) {
+		sock_info->session_enabled = 0;
+		lttng_handle_pending_statedumps(&lttng_ust_baddr_statedump);
+	}
+}
+
 static
 void cleanup_sock_info(struct sock_info *sock_info, int exiting)
 {
@@ -1144,6 +1224,8 @@ restart:
 			ret = handle_message(sock_info, sock, &lum);
 			if (ret) {
 				ERR("Error handling message for %s socket", sock_info->name);
+			} else {
+				handle_pending_statedumps(sock_info);
 			}
 			continue;
 		default:
@@ -1457,3 +1539,9 @@ void ust_after_fork_child(sigset_t *restore_sigset)
 	ust_after_fork_common(restore_sigset);
 	lttng_ust_init();
 }
+
+void lttng_ust_sockinfo_session_enabled(void *owner)
+{
+	struct sock_info *sock_info = owner;
+	sock_info->session_enabled = 1;
+}