X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-ust-comm.c;h=b99bf00edec2df760df075f0ad77597a3e1a54d1;hb=394598c1632131141b04ae80cb5e0d40004b95f0;hp=18763c45fd3a9c0e499f50ddf657b2b3996c0f29;hpb=34a91bdb42a2a3b01b687ab5e1ba7638401e6dfc;p=lttng-ust.git

diff --git a/liblttng-ust/lttng-ust-comm.c b/liblttng-ust/lttng-ust-comm.c
index 18763c45..b99bf00e 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;
+	struct lttng_session *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 = NULL,
 };
 
 /* TODO: allow global_apps_sock_path override */
@@ -135,6 +140,8 @@ struct sock_info local_apps = {
 
 	.socket = -1,
 	.notify_socket = -1,
+
+	.session_enabled = NULL,
 };
 
 static int wait_poll_fallback;
@@ -172,6 +179,7 @@ static const char *cmd_name_mapping[] = {
 
 	/* Event FD commands */
 	[ LTTNG_UST_FILTER ] = "Create Filter",
+	[ LTTNG_UST_EXCLUSION ] = "Add exclusions to event",
 };
 
 static const char *str_timeout;
@@ -188,6 +196,22 @@ extern void lttng_ring_buffer_client_discard_exit(void);
 extern void lttng_ring_buffer_client_discard_rt_exit(void);
 extern void lttng_ring_buffer_metadata_client_exit(void);
 
+/*
+ * Returns the HOME directory path. Caller MUST NOT free(3) the returned
+ * pointer.
+ */
+static
+const char *get_lttng_home_dir(void)
+{
+       const char *val;
+
+       val = (const char *) getenv("LTTNG_HOME");
+       if (val != NULL) {
+               return val;
+       }
+       return (const char *) getenv("HOME");
+}
+
 /*
  * Force a read (imply TLS fixup for dlopen) of TLS variables.
  */
@@ -209,10 +233,12 @@ void print_cmd(int cmd, int handle)
 {
 	const char *cmd_name = "Unknown";
 
-	if (cmd_name_mapping[cmd]) {
+	if (cmd >= 0 && cmd < LTTNG_ARRAY_SIZE(cmd_name_mapping)
+			&& cmd_name_mapping[cmd]) {
 		cmd_name = cmd_name_mapping[cmd];
 	}
-	DBG("Message Received \"%s\", Handle \"%s\" (%d)", cmd_name,
+	DBG("Message Received \"%s\" (%d), Handle \"%s\" (%d)",
+		cmd_name, cmd,
 		lttng_ust_obj_get_name(handle), handle);
 }
 
@@ -230,7 +256,7 @@ int setup_local_apps(void)
 		assert(local_apps.allowed == 0);
 		return 0;
 	}
-	home_dir = (const char *) getenv("HOME");
+	home_dir = get_lttng_home_dir();
 	if (!home_dir) {
 		WARN("HOME environment variable not set. Disabling LTTng-UST per-user tracing.");
 		assert(local_apps.allowed == 0);
@@ -443,6 +469,7 @@ int handle_message(struct sock_info *sock_info,
 					goto error;
 				}
 				ret = len;
+				free(bytecode);
 				goto end;
 			} else {
 				DBG("incorrect filter data message size: %zd", len);
@@ -468,6 +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;
@@ -624,6 +713,25 @@ void cleanup_sock_info(struct sock_info *sock_info, int exiting)
 {
 	int ret;
 
+	if (sock_info->root_handle != -1) {
+		ret = lttng_ust_objd_unref(sock_info->root_handle, 1);
+		if (ret) {
+			ERR("Error unref root handle");
+		}
+		sock_info->root_handle = -1;
+	}
+	sock_info->constructor_sem_posted = 0;
+
+	/*
+	 * wait_shm_mmap, socket and notify socket are used by listener
+	 * threads outside of the ust lock, so we cannot tear them down
+	 * ourselves, because we cannot join on these threads. Leave
+	 * responsibility of cleaning up these resources to the OS
+	 * process exit.
+	 */
+	if (exiting)
+		return;
+
 	if (sock_info->socket != -1) {
 		ret = ustcomm_close_unix_sock(sock_info->socket);
 		if (ret) {
@@ -638,21 +746,7 @@ void cleanup_sock_info(struct sock_info *sock_info, int exiting)
 		}
 		sock_info->notify_socket = -1;
 	}
-	if (sock_info->root_handle != -1) {
-		ret = lttng_ust_objd_unref(sock_info->root_handle, 1);
-		if (ret) {
-			ERR("Error unref root handle");
-		}
-		sock_info->root_handle = -1;
-	}
-	sock_info->constructor_sem_posted = 0;
-	/*
-	 * wait_shm_mmap is used by listener threads outside of the
-	 * ust lock, so we cannot tear it down ourselves, because we
-	 * cannot join on these threads. Leave this task to the OS
-	 * process exit.
-	 */
-	if (!exiting && sock_info->wait_shm_mmap) {
+	if (sock_info->wait_shm_mmap) {
 		ret = munmap(sock_info->wait_shm_mmap, sysconf(_SC_PAGE_SIZE));
 		if (ret) {
 			ERR("Error unmapping wait shm");
@@ -681,6 +775,30 @@ int get_wait_shm(struct sock_info *sock_info, size_t mmap_size)
 	 */
 	wait_shm_fd = shm_open(sock_info->wait_shm_path, O_RDONLY, 0);
 	if (wait_shm_fd >= 0) {
+		int32_t tmp_read;
+		ssize_t len;
+		size_t bytes_read = 0;
+
+		/*
+		 * Try to read the fd. If unable to do so, try opening
+		 * it in write mode.
+		 */
+		do {
+			len = read(wait_shm_fd,
+				&((char *) &tmp_read)[bytes_read],
+				sizeof(tmp_read) - bytes_read);
+			if (len > 0) {
+				bytes_read += len;
+			}
+		} while ((len < 0 && errno == EINTR)
+			|| (len > 0 && bytes_read < sizeof(tmp_read)));
+		if (bytes_read != sizeof(tmp_read)) {
+			ret = close(wait_shm_fd);
+			if (ret) {
+				ERR("close wait_shm_fd");
+			}
+			goto open_write;
+		}
 		goto end;
 	} else if (wait_shm_fd < 0 && errno != ENOENT) {
 		/*
@@ -691,9 +809,11 @@ int get_wait_shm(struct sock_info *sock_info, size_t mmap_size)
 		ERR("Error opening shm %s", sock_info->wait_shm_path);
 		goto end;
 	}
+
+open_write:
 	/*
-	 * If the open failed because the file did not exist, try
-	 * creating it ourself.
+	 * If the open failed because the file did not exist, or because
+	 * the file was not truncated yet, try creating it ourself.
 	 */
 	URCU_TLS(lttng_ust_nest_count)++;
 	pid = fork();
@@ -888,8 +1008,6 @@ void *ust_listener_thread(void *arg)
 {
 	struct sock_info *sock_info = arg;
 	int sock, ret, prev_connect_failed = 0, has_waited = 0;
-	int open_sock[2];
-	int i;
 	long timeout;
 
 	/* Restart trying to connect to the session daemon */
@@ -909,11 +1027,6 @@ restart:
 		has_waited = 1;
 		prev_connect_failed = 0;
 	}
-	ust_lock();
-
-	if (lttng_ust_comm_should_quit) {
-		goto quit;
-	}
 
 	if (sock_info->socket != -1) {
 		ret = ustcomm_close_unix_sock(sock_info->socket);
@@ -932,47 +1045,40 @@ restart:
 		sock_info->notify_socket = -1;
 	}
 
-	/* Register */
-	for (i = 0; i < 2; i++) {
-		ret = ustcomm_connect_unix_sock(sock_info->sock_path);
-		if (ret < 0) {
-			DBG("Info: sessiond not accepting connections to %s apps socket", sock_info->name);
-			prev_connect_failed = 1;
-			/*
-			 * If we cannot find the sessiond daemon, don't delay
-			 * constructor execution.
-			 */
-			ret = handle_register_done(sock_info);
-			assert(!ret);
-			ust_unlock();
-			goto restart;
-		}
-		open_sock[i] = ret;
-	}
+	/*
+	 * Register. We need to perform both connect and sending
+	 * registration message before doing the next connect otherwise
+	 * we may reach unix socket connect queue max limits and block
+	 * on the 2nd connect while the session daemon is awaiting the
+	 * first connect registration message.
+	 */
+	/* Connect cmd socket */
+	ret = ustcomm_connect_unix_sock(sock_info->sock_path);
+	if (ret < 0) {
+		DBG("Info: sessiond not accepting connections to %s apps socket", sock_info->name);
+		prev_connect_failed = 1;
 
-	sock_info->socket = open_sock[0];
-	sock_info->notify_socket = open_sock[1];
+		ust_lock();
+
+		if (lttng_ust_comm_should_quit) {
+			goto quit;
+		}
 
-	timeout = get_notify_sock_timeout();
-	if (timeout >= 0) {
 		/*
-		 * Give at least 10ms to sessiond to reply to
-		 * notifications.
+		 * If we cannot find the sessiond daemon, don't delay
+		 * constructor execution.
 		 */
-		if (timeout < 10)
-			timeout = 10;
-		ret = ustcomm_setsockopt_rcv_timeout(sock_info->notify_socket,
-				timeout);
-		if (ret < 0) {
-			WARN("Error setting socket receive timeout");
-		}
-		ret = ustcomm_setsockopt_snd_timeout(sock_info->notify_socket,
-				timeout);
-		if (ret < 0) {
-			WARN("Error setting socket send timeout");
-		}
-	} else if (timeout < -1) {
-		WARN("Unsuppoorted timeout value %ld", timeout);
+		ret = handle_register_done(sock_info);
+		assert(!ret);
+		ust_unlock();
+		goto restart;
+	}
+	sock_info->socket = ret;
+
+	ust_lock();
+
+	if (lttng_ust_comm_should_quit) {
+		goto quit;
 	}
 
 	/*
@@ -1003,6 +1109,60 @@ restart:
 		ust_unlock();
 		goto restart;
 	}
+
+	ust_unlock();
+
+	/* Connect notify socket */
+	ret = ustcomm_connect_unix_sock(sock_info->sock_path);
+	if (ret < 0) {
+		DBG("Info: sessiond not accepting connections to %s apps socket", sock_info->name);
+		prev_connect_failed = 1;
+
+		ust_lock();
+
+		if (lttng_ust_comm_should_quit) {
+			goto quit;
+		}
+
+		/*
+		 * If we cannot find the sessiond daemon, don't delay
+		 * constructor execution.
+		 */
+		ret = handle_register_done(sock_info);
+		assert(!ret);
+		ust_unlock();
+		goto restart;
+	}
+	sock_info->notify_socket = ret;
+
+	timeout = get_notify_sock_timeout();
+	if (timeout >= 0) {
+		/*
+		 * Give at least 10ms to sessiond to reply to
+		 * notifications.
+		 */
+		if (timeout < 10)
+			timeout = 10;
+		ret = ustcomm_setsockopt_rcv_timeout(sock_info->notify_socket,
+				timeout);
+		if (ret < 0) {
+			WARN("Error setting socket receive timeout");
+		}
+		ret = ustcomm_setsockopt_snd_timeout(sock_info->notify_socket,
+				timeout);
+		if (ret < 0) {
+			WARN("Error setting socket send timeout");
+		}
+	} else if (timeout < -1) {
+		WARN("Unsupported timeout value %ld", timeout);
+	}
+
+	ust_lock();
+
+	if (lttng_ust_comm_should_quit) {
+		goto quit;
+	}
+
 	ret = register_to_sessiond(sock_info->notify_socket,
 			USTCTL_SOCKET_NOTIFY);
 	if (ret < 0) {
@@ -1053,6 +1213,14 @@ restart:
 			ret = handle_message(sock_info, sock, &lum);
 			if (ret) {
 				ERR("Error handling message for %s socket", sock_info->name);
+			} else {
+				struct lttng_session *session;
+
+				session = sock_info->session_enabled;
+				if (session) {
+					sock_info->session_enabled = NULL;
+					lttng_ust_baddr_statedump(session);
+				}
 			}
 			continue;
 		default:
@@ -1123,6 +1291,7 @@ void __attribute__((constructor)) lttng_ust_init(void)
 	lttng_ring_buffer_client_overwrite_rt_init();
 	lttng_ring_buffer_client_discard_init();
 	lttng_ring_buffer_client_discard_rt_init();
+	lttng_context_init();
 
 	timeout_mode = get_constructor_timeout(&constructor_timeout);
 
@@ -1225,6 +1394,7 @@ void lttng_ust_cleanup(int exiting)
 	 */
 	lttng_ust_abi_exit();
 	lttng_ust_events_exit();
+	lttng_context_exit();
 	lttng_ring_buffer_client_discard_rt_exit();
 	lttng_ring_buffer_client_discard_exit();
 	lttng_ring_buffer_client_overwrite_rt_exit();
@@ -1364,3 +1534,10 @@ 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 lttng_session *session_enabled)
+{
+	struct sock_info *sock_info = owner;
+	sock_info->session_enabled = session_enabled;
+}