Update local copy of UST ABI, for padding
[lttng-tools.git] / src / bin / lttng-sessiond / utils.c
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8e68d1c8 1/*
996b65c8 2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
1e307fab 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8e68d1c8 4 *
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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.
8e68d1c8 8 *
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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.
8e68d1c8 13 *
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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.
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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>
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25#include <unistd.h>
26
db758600 27#include <common/error.h>
7272acf5 28
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29#include "utils.h"
30
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31/*
32 * Write to writable pipe used to notify a thread.
33 */
34int notify_thread_pipe(int wpipe)
35{
36 int ret;
37
38 ret = write(wpipe, "!", 1);
39 if (ret < 0) {
7272acf5 40 PERROR("write poll pipe");
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41 }
42
43 return ret;
44}
45
b082db07 46/*
050349bb 47 * Return pointer to home directory path using the env variable HOME.
b082db07 48 *
050349bb 49 * No home, NULL is returned.
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50 */
51const char *get_home_dir(void)
52{
53 return ((const char *) getenv("HOME"));
54}
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