Small fix to lttng list session
[lttng-tools.git] / src / bin / lttng-sessiond / utils.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <errno.h>
21 #include <limits.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <unistd.h>
26
27 #include <common/error.h>
28
29 #include "utils.h"
30
31 /*
32 * Write to writable pipe used to notify a thread.
33 */
34 int notify_thread_pipe(int wpipe)
35 {
36 int ret;
37
38 ret = write(wpipe, "!", 1);
39 if (ret < 0) {
40 PERROR("write poll pipe");
41 }
42
43 return ret;
44 }
45
46 /*
47 * Return pointer to home directory path using the env variable HOME.
48 *
49 * No home, NULL is returned.
50 */
51 const char *get_home_dir(void)
52 {
53 return ((const char *) getenv("HOME"));
54 }
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