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

/*
 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
 *                      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.
 *
 * 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 <stdlib.h>
#include <unistd.h>

#include <common/error.h>

#include "utils.h"

/*
 * Write to writable pipe used to notify a thread.
 */
int notify_thread_pipe(int wpipe)
{
	int ret;

	do {
		ret = write(wpipe, "!", 1);
	} while (ret < 0 && errno == EINTR);
	if (ret < 0) {
		PERROR("write poll pipe");
	}

	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"));
}
Commit	Line	Data
	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
	6	* it under the terms of the GNU General Public License, version 2 only,
	7	* as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along
	15	* with this program; if not, write to the Free Software Foundation, Inc.,
	16	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	17	*/
	18
	19	#define _GNU_SOURCE
	20	#include <stdlib.h>
	21	#include <unistd.h>
	22
	23	#include <common/error.h>
	24
	25	#include "utils.h"
	26
	27	/*
	28	* Write to writable pipe used to notify a thread.
	29	*/
	30	int notify_thread_pipe(int wpipe)
	31	{
	32	int ret;
	33
	34	do {
	35	ret = write(wpipe, "!", 1);
	36	} while (ret < 0 && errno == EINTR);
	37	if (ret < 0) {
	38	PERROR("write poll pipe");
	39	}
	40
	41	return ret;
	42	}
	43
	44	/*
	45	* Return pointer to home directory path using the env variable HOME.
	46	*
	47	* No home, NULL is returned.
	48	*/
	49	const char *get_home_dir(void)
	50	{
	51	return ((const char *) getenv("HOME"));
	52	}