sessiond: notification: synchronize notification client (and list)

[lttng-tools.git] / src / bin / lttng-sessiond / utils.c

diff --git a/src/bin/lttng-sessiond/utils.c b/src/bin/lttng-sessiond/utils.c
index d0c8dd16f62571618db8118759d7a8ee4e650a76..f84859fc621645aea1939d7c04648c7ac729682a 100644 (file)
--- a/src/bin/lttng-sessiond/utils.c
+++ b/src/bin/lttng-sessiond/utils.c
@@ -1,129 +1,100 @@
 /*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
  *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#define _GNU_SOURCE
-#include <errno.h>
-#include <fcntl.h>
-#include <limits.h>
-#include <stdio.h>
+#define _LGPL_SOURCE
 #include <stdlib.h>
-#include <string.h>
 #include <unistd.h>
 
 #include <common/error.h>
 
 #include "utils.h"
+#include "snapshot.h"
+#include "lttng-sessiond.h"
+
+int ht_cleanup_pipe[2] = { -1, -1 };
 
 /*
  * Write to writable pipe used to notify a thread.
  */
 int notify_thread_pipe(int wpipe)
 {
-       int ret;
+       ssize_t ret;
 
-       ret = write(wpipe, "!", 1);
-       if (ret < 0) {
-               PERROR("write poll pipe");
+       /* Ignore if the pipe is invalid. */
+       if (wpipe < 0) {
+               return 0;
        }
 
-       return ret;
-}
-
-/*
- * Return pointer to home directory path using the env variable HOME.
- *
- * No home, NULL is returned.
- */
-const char *get_home_dir(void)
-{
-       return ((const char *) getenv("HOME"));
-}
-
-/*
- * Create a pipe in dst.
- */
-int utils_create_pipe(int *dst)
-{
-       int ret;
-
-       if (dst == NULL) {
-               return -1;
-       }
-
-       ret = pipe(dst);
-       if (ret < 0) {
-               PERROR("create pipe");
+       ret = lttng_write(wpipe, "!", 1);
+       if (ret < 1) {
+               PERROR("write poll pipe");
        }
 
-       return ret;
+       return (int) ret;
 }
 
-/*
- * Create pipe and set CLOEXEC flag to both fd.
- *
- * Make sure the pipe opened by this function are closed at some point. Use
- * utils_close_pipe().
- */
-int utils_create_pipe_cloexec(int *dst)
+void ht_cleanup_push(struct lttng_ht *ht)
 {
-       int ret, i;
+       ssize_t ret;
+       int fd = ht_cleanup_pipe[1];
 
-       if (dst == NULL) {
-               return -1;
-       }
-
-       ret = utils_create_pipe(dst);
-       if (ret < 0) {
-               goto error;
+       if (!ht) {
+               return;
        }
-
-       for (i = 0; i < 2; i++) {
-               ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC);
+       if (fd < 0)
+               return;
+       ret = lttng_write(fd, &ht, sizeof(ht));
+       if (ret < sizeof(ht)) {
+               PERROR("write ht cleanup pipe %d", fd);
                if (ret < 0) {
-                       PERROR("fcntl pipe cloexec");
-                       goto error;
+                       ret = -errno;
                }
+               goto error;
        }
 
+       /* All good. Don't send back the write positive ret value. */
+       ret = 0;
 error:
-       return ret;
+       assert(!ret);
 }
 
-/*
- * Close both read and write side of the pipe.
- */
-void utils_close_pipe(int *src)
+int loglevels_match(int a_loglevel_type, int a_loglevel_value,
+       int b_loglevel_type, int b_loglevel_value, int loglevel_all_type)
 {
-       int i, ret;
-
-       if (src == NULL) {
-               return;
+       int match = 1;
+
+       if (a_loglevel_type == b_loglevel_type) {
+               /* Same loglevel type. */
+               if (b_loglevel_type != loglevel_all_type) {
+                       /*
+                        * Loglevel value must also match since the loglevel
+                        * type is not all.
+                        */
+                       if (a_loglevel_value != b_loglevel_value) {
+                               match = 0;
+                       }
+               }
+       } else {
+               /* Loglevel type is different: no match. */
+               match = 0;
        }
 
-       for (i = 0; i < 2; i++) {
-               /* Safety check */
-               if (src[i] < 0) {
-                       continue;
-               }
+       return match;
+}
 
-               ret = close(src[i]);
-               if (ret) {
-                       PERROR("close pipe");
-               }
-       }
+const char *session_get_base_path(const struct ltt_session *session)
+{
+       return consumer_output_get_base_path(session->consumer);
+}
+
+const char *consumer_output_get_base_path(const struct consumer_output *output)
+{
+       return output->type == CONSUMER_DST_LOCAL ?
+                       output->dst.session_root_path :
+                       output->dst.net.base_dir;
 }