From 2c7cac91ed6e7db0f6937923d2b57f97dbdbc337 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 11:53:30 +0200 Subject: Adding upstream version 8.4.4. Signed-off-by: Daniel Baumann --- lib/pid_output.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 lib/pid_output.c (limited to 'lib/pid_output.c') diff --git a/lib/pid_output.c b/lib/pid_output.c new file mode 100644 index 0000000..b82dde8 --- /dev/null +++ b/lib/pid_output.c @@ -0,0 +1,83 @@ +/* + * Process id output. + * Copyright (C) 1998, 1999 Kunihiro Ishiguro + * + * This file is part of GNU Zebra. + * + * GNU Zebra is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2, or (at your option) any + * later version. + * + * GNU Zebra 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; see the file COPYING; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include +#include +#include "lib/version.h" +#include "network.h" +#include "lib_errors.h" + +#define PIDFILE_MASK 0644 + +pid_t pid_output(const char *path) +{ + int tmp; + int fd; + pid_t pid; + char buf[16]; + struct flock lock; + mode_t oldumask; + + pid = getpid(); + + oldumask = umask(0777 & ~PIDFILE_MASK); + fd = open(path, O_RDWR | O_CREAT, PIDFILE_MASK); + if (fd < 0) { + flog_err_sys(EC_LIB_SYSTEM_CALL, + "Can't create pid lock file %s (%s), exiting", + path, safe_strerror(errno)); + umask(oldumask); + exit(1); + } else { + size_t pidsize; + + umask(oldumask); + memset(&lock, 0, sizeof(lock)); + + set_cloexec(fd); + + lock.l_type = F_WRLCK; + lock.l_whence = SEEK_SET; + + if (fcntl(fd, F_SETLK, &lock) < 0) { + flog_err_sys(EC_LIB_SYSTEM_CALL, + "Could not lock pid_file %s (%s), exiting. Please ensure that the daemon is not already running", + path, safe_strerror(errno)); + exit(1); + } + + snprintf(buf, sizeof(buf), "%d\n", (int)pid); + pidsize = strlen(buf); + if ((tmp = write(fd, buf, pidsize)) != (int)pidsize) + flog_err_sys( + EC_LIB_SYSTEM_CALL, + "Could not write pid %d to pid_file %s, rc was %d: %s", + (int)pid, path, tmp, safe_strerror(errno)); + else if (ftruncate(fd, pidsize) < 0) + flog_err_sys( + EC_LIB_SYSTEM_CALL, + "Could not truncate pid_file %s to %u bytes: %s", + path, (unsigned int)pidsize, + safe_strerror(errno)); + } + return pid; +} -- cgit v1.2.3