Fix: typo in --sig-parent help

[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 6d6140b1f891f10c75f4cff539c0f6776b7272aa..963f75e49ada100fc3af7944ba7bb06d4644203d 100644 (file)
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -455,6 +455,11 @@ static void cleanup(void)
        DBG("Removing %s", path);
        (void) unlink(path);
 
+       snprintf(path, PATH_MAX, "%s/%s", rundir,
+                       DEFAULT_LTTNG_SESSIOND_JULPORT_FILE);
+       DBG("Removing %s", path);
+       (void) unlink(path);
+
        /* kconsumerd */
        snprintf(path, PATH_MAX,
                DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
@@ -494,6 +499,12 @@ static void cleanup(void)
        DBG("Removing directory %s", path);
        (void) rmdir(path);
 
+       /*
+        * We do NOT rmdir rundir because there are other processes
+        * using it, for instance lttng-relayd, which can start in
+        * parallel with this teardown.
+        */
+
        free(rundir);
 
        DBG("Cleaning up all sessions");
@@ -860,9 +871,8 @@ static void *thread_manage_kernel(void *data)
 
                        /* Check for data on kernel pipe */
                        if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
-                               do {
-                                       ret = read(kernel_poll_pipe[0], &tmp, 1);
-                               } while (ret < 0 && errno == EINTR);
+                               (void) lttng_read(kernel_poll_pipe[0],
+                                       &tmp, 1);
                                /*
                                 * Ret value is useless here, if this pipe gets any actions an
                                 * update is required anyway.
@@ -1234,6 +1244,7 @@ error_poll:
 static void *thread_manage_apps(void *data)
 {
        int i, ret, pollfd, err = -1;
+       ssize_t size_ret;
        uint32_t revents, nb_fd;
        struct lttng_poll_event events;
 
@@ -1309,10 +1320,8 @@ static void *thread_manage_apps(void *data)
                                        int sock;
 
                                        /* Empty pipe */
-                                       do {
-                                               ret = read(apps_cmd_pipe[0], &sock, sizeof(sock));
-                                       } while (ret < 0 && errno == EINTR);
-                                       if (ret < 0 || ret < sizeof(sock)) {
+                                       size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock));
+                                       if (size_ret < sizeof(sock)) {
                                                PERROR("read apps cmd pipe");
                                                goto error;
                                        }
@@ -1395,7 +1404,7 @@ error_testpoint:
  */
 static int send_socket_to_thread(int fd, int sock)
 {
-       int ret;
+       ssize_t ret;
 
        /*
         * It's possible that the FD is set as invalid with -1 concurrently just
@@ -1406,10 +1415,8 @@ static int send_socket_to_thread(int fd, int sock)
                goto error;
        }
 
-       do {
-               ret = write(fd, &sock, sizeof(sock));
-       } while (ret < 0 && errno == EINTR);
-       if (ret < 0 || ret != sizeof(sock)) {
+       ret = lttng_write(fd, &sock, sizeof(sock));
+       if (ret < sizeof(sock)) {
                PERROR("write apps pipe %d", fd);
                if (ret < 0) {
                        ret = -errno;
@@ -1420,7 +1427,7 @@ static int send_socket_to_thread(int fd, int sock)
        /* All good. Don't send back the write positive ret value. */
        ret = 0;
 error:
-       return ret;
+       return (int) ret;
 }
 
 /*
@@ -1573,7 +1580,7 @@ static void *thread_dispatch_ust_registration(void *data)
                                        if (ret < 0) {
                                                PERROR("close ust sock dispatch %d", ust_cmd->sock);
                                        }
-                                       lttng_fd_put(1, LTTNG_FD_APPS);
+                                       lttng_fd_put(LTTNG_FD_APPS, 1);
                                        free(ust_cmd);
                                        goto error;
                                }
@@ -1587,7 +1594,7 @@ static void *thread_dispatch_ust_registration(void *data)
                                        if (ret < 0) {
                                                PERROR("close ust sock dispatch %d", ust_cmd->sock);
                                        }
-                                       lttng_fd_put(1, LTTNG_FD_APPS);
+                                       lttng_fd_put(LTTNG_FD_APPS, 1);
                                        free(wait_node);
                                        free(ust_cmd);
                                        continue;
@@ -1635,7 +1642,7 @@ static void *thread_dispatch_ust_registration(void *data)
                                        if (ret < 0) {
                                                PERROR("close ust sock dispatch %d", ust_cmd->sock);
                                        }
-                                       lttng_fd_put(1, LTTNG_FD_APPS);
+                                       lttng_fd_put(LTTNG_FD_APPS, 1);
                                }
                                free(ust_cmd);
                        }
@@ -2415,6 +2422,7 @@ static int copy_session_consumer(int domain, struct ltt_session *session)
                consumer = session->kernel_session->consumer;
                dir_name = DEFAULT_KERNEL_TRACE_DIR;
                break;
+       case LTTNG_DOMAIN_JUL:
        case LTTNG_DOMAIN_UST:
                DBG3("Copying tracing session consumer output in UST session");
                if (session->ust_session->consumer) {
@@ -2458,6 +2466,7 @@ static int create_ust_session(struct ltt_session *session,
        assert(session->consumer);
 
        switch (domain->type) {
+       case LTTNG_DOMAIN_JUL:
        case LTTNG_DOMAIN_UST:
                break;
        default:
@@ -2750,10 +2759,6 @@ static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
 
                break;
        case LTTNG_DOMAIN_JUL:
-       {
-               ret = LTTNG_ERR_UNKNOWN_DOMAIN;
-               goto error;
-       }
        case LTTNG_DOMAIN_UST:
        {
                if (!ust_app_supported()) {
@@ -3916,7 +3921,7 @@ static void usage(void)
        fprintf(stderr, "  -d, --daemonize                    Start as a daemon.\n");
        fprintf(stderr, "  -g, --group NAME                   Specify the tracing group name. (default: tracing)\n");
        fprintf(stderr, "  -V, --version                      Show version number.\n");
-       fprintf(stderr, "  -S, --sig-parent                   Send SIGCHLD to parent pid to notify readiness.\n");
+       fprintf(stderr, "  -S, --sig-parent                   Send SIGUSR1 to parent pid to notify readiness.\n");
        fprintf(stderr, "  -q, --quiet                        No output at all.\n");
        fprintf(stderr, "  -v, --verbose                      Verbose mode. Activate DBG() macro.\n");
        fprintf(stderr, "  -p, --pidfile FILE                 Write a pid to FILE name overriding the default value.\n");
@@ -4431,6 +4436,34 @@ error:
        return;
 }
 
+/*
+ * Write JUL TCP port using the rundir.
+ */
+static void write_julport(void)
+{
+       int ret;
+       char path[PATH_MAX];
+
+       assert(rundir);
+
+       ret = snprintf(path, sizeof(path), "%s/"
+                       DEFAULT_LTTNG_SESSIOND_JULPORT_FILE, rundir);
+       if (ret < 0) {
+               PERROR("snprintf julport path");
+               goto error;
+       }
+
+       /*
+        * Create TCP JUL port file in rundir. Return value is of no importance.
+        * The execution will continue even though we are not able to write the
+        * file.
+        */
+       (void) utils_create_pid_file(jul_tcp_port, path);
+
+error:
+       return;
+}
+
 /*
  * main
  */
@@ -4628,6 +4661,12 @@ int main(int argc, char **argv)
         */
        ust_app_ht_alloc();
 
+       /* Initialize JUL domain subsystem. */
+       if ((ret = jul_init()) < 0) {
+               /* ENOMEM at this point. */
+               goto error;
+       }
+
        /* After this point, we can safely call cleanup() with "goto exit" */
 
        /*
@@ -4731,6 +4770,7 @@ int main(int argc, char **argv)
        }
 
        write_pidfile();
+       write_julport();
 
        /* Initialize communication library */
        lttcomm_init();
@@ -4747,7 +4787,7 @@ int main(int argc, char **argv)
                goto exit_health_sessiond_cleanup;
        }
 
-       /* Create thread to manage the client socket */
+       /* Create thread to clean up RCU hash tables */
        ret = pthread_create(&ht_cleanup_thread, NULL,
                        thread_ht_cleanup, (void *) NULL);
        if (ret != 0) {
@@ -4755,7 +4795,7 @@ int main(int argc, char **argv)
                goto exit_ht_cleanup;
        }
 
-       /* Create thread to manage the client socket */
+       /* Create health-check thread */
        ret = pthread_create(&health_thread, NULL,
                        thread_manage_health, (void *) NULL);
        if (ret != 0) {