blob: 3fa944861fdfe38491a1eb37bc30e35f5b13469d [file] [log] [blame]
/*
* pidfile.c -- pidfile handling
*
* (c) Copyright IBM Corporation 2015.
*
* Author: Stefan Berger <stefanb@us.ibm.com>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the names of the IBM Corporation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include "pidfile.h"
#include "logging.h"
#include "utils.h"
static char *g_pidfile;
static int pidfilefd = -1;
int pidfile_set(const char *pidfile)
{
g_pidfile = strdup(pidfile);
if (!g_pidfile) {
logprintf(STDERR_FILENO, "Out of memory.\n");
return -1;
}
return 0;
}
int pidfile_set_fd(int newpidfilefd)
{
pidfilefd = newpidfilefd;
return 0;
}
/*
* pidfile_write: Write the given pid to the pidfile
*
* @pid: the PID to write
*
* Returns 0 on success, -1 on failure.
*/
int pidfile_write(pid_t pid)
{
int fd;
char buffer[32];
ssize_t nwritten;
if (g_pidfile) {
fd = open(g_pidfile, O_WRONLY|O_CREAT|O_TRUNC|O_NOFOLLOW,
S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
} else if (pidfilefd >= 0) {
fd = pidfilefd;
g_pidfile = fd_to_filename(pidfilefd);
if (!g_pidfile)
goto error;
pidfile_set_fd(-1); /* will be closed */
} else {
return 0;
}
if (fd < 0) {
logprintf(STDERR_FILENO, "Could not open pidfile %s : %s\n",
g_pidfile, strerror(errno));
goto error;
}
if (snprintf(buffer, sizeof(buffer), "%d", pid) >= (int)sizeof(buffer)) {
logprintf(STDERR_FILENO, "Could not write pid to buffer\n");
goto error_close;
}
nwritten = write_full(fd, buffer, strlen(buffer));
if (nwritten < 0 || nwritten != (ssize_t)strlen(buffer)) {
logprintf(STDERR_FILENO, "Could not write to pidfile : %s\n",
strerror(errno));
goto error_close;
}
close(fd);
return 0;
error_close:
close(fd);
error:
return -1;
}
/*
* pidfile_remove: Remove the pid file
*
*/
void pidfile_remove(void)
{
if (!g_pidfile)
return;
unlink(g_pidfile);
free(g_pidfile);
g_pidfile = NULL;
}