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8c5ff531a1
Give a hint to the end user that the daemon may already be running. Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/*
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* Process id output.
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* Copyright (C) 1998, 1999 Kunihiro Ishiguro
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*
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* This file is part of GNU Zebra.
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*
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* GNU Zebra is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* GNU Zebra is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <zebra.h>
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#include <fcntl.h>
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#include <log.h>
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#include "version.h"
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#include "network.h"
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#include "lib_errors.h"
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#define PIDFILE_MASK 0644
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pid_t pid_output(const char *path)
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{
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int tmp;
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int fd;
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pid_t pid;
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char buf[16];
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struct flock lock;
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mode_t oldumask;
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pid = getpid();
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oldumask = umask(0777 & ~PIDFILE_MASK);
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fd = open(path, O_RDWR | O_CREAT, PIDFILE_MASK);
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if (fd < 0) {
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flog_err_sys(EC_LIB_SYSTEM_CALL,
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"Can't create pid lock file %s (%s), exiting",
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path, safe_strerror(errno));
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umask(oldumask);
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exit(1);
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} else {
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size_t pidsize;
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umask(oldumask);
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memset(&lock, 0, sizeof(lock));
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set_cloexec(fd);
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lock.l_type = F_WRLCK;
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lock.l_whence = SEEK_SET;
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if (fcntl(fd, F_SETLK, &lock) < 0) {
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flog_err_sys(EC_LIB_SYSTEM_CALL,
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"Could not lock pid_file %s (%s), exiting. Please ensure that the daemon is not already running",
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path, safe_strerror(errno));
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exit(1);
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}
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sprintf(buf, "%d\n", (int)pid);
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pidsize = strlen(buf);
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if ((tmp = write(fd, buf, pidsize)) != (int)pidsize)
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flog_err_sys(
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EC_LIB_SYSTEM_CALL,
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"Could not write pid %d to pid_file %s, rc was %d: %s",
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(int)pid, path, tmp, safe_strerror(errno));
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else if (ftruncate(fd, pidsize) < 0)
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flog_err_sys(
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EC_LIB_SYSTEM_CALL,
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"Could not truncate pid_file %s to %u bytes: %s",
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path, (unsigned int)pidsize,
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safe_strerror(errno));
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}
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return pid;
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}
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