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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 09:53:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 09:53:30 +0000
commit2c7cac91ed6e7db0f6937923d2b57f97dbdbc337 (patch)
treec05dc0f8e6aa3accc84e3e5cffc933ed94941383 /lib/pid_output.c
parentInitial commit. (diff)
downloadfrr-2c7cac91ed6e7db0f6937923d2b57f97dbdbc337.tar.xz
frr-2c7cac91ed6e7db0f6937923d2b57f97dbdbc337.zip
Adding upstream version 8.4.4.upstream/8.4.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--lib/pid_output.c83
1 files changed, 83 insertions, 0 deletions
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 <zebra.h>
+#include <fcntl.h>
+#include <log.h>
+#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;
+}