1 files changed, 85 insertions, 0 deletions
diff --git a/lib/util/pidfile.h b/lib/util/pidfile.h
new file mode 100644
index 0000000..6f345a9
--- /dev/null
+++ b/lib/util/pidfile.h
@@ -0,0 +1,85 @@
+/*
+   Unix SMB/CIFS implementation.
+   Samba utility functions
+   Copyright (C) Jeremy Allison 2012.
+
+   This program 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 3 of the License, or
+   (at your option) any later version.
+
+   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, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _SAMBA_PIDFILE_H_
+#define _SAMBA_PIDFILE_H_
+
+/**
+ * @file pidfile.h
+ *
+ * @brief PID file handling
+ */
+
+/**
+ * @brief Create a PID file
+ *
+ * Opens file, locks it, and writes PID.  Returns EAGAIN if another
+ * process has the PID file locked.  Use unlink(2) and
+ * pidfile_fd_close() to remove the PID file.
+ *
+ * @param[in] path PID file name
+ * @param[out] outfd File descriptor of open/locked PID file
+ * @param[out] existing_pid Return existing PID on EAGAIN
+ * @return 0 on success, errno on failure
+ */
+int pidfile_path_create(
+	const char *path, int *outfd, pid_t *existing_pid);
+
+/**
+ * @brief Unlock and close a PID file
+ *
+ * @param[in] fd File descriptor of open/locked PID file
+ */
+void pidfile_fd_close(int fd);
+
+/**
+ * @brief Check a PID file
+ *
+ * PID file name is <piddir>/<name>.pid
+ *
+ * @param[in] piddir Directory for PID file
+ * @param[in] name PID file process name
+ * @return PID of active process, 0 if PID file missing/stale/error
+ */
+pid_t pidfile_pid(const char *piddir, const char *name);
+
+/**
+ * @brief Create a PID file
+ *
+ * Leave PID file open/locked on success, exit on failure.  On
+ * success, use pidfile_unlink() to remove PID file before exiting.
+ *
+ * PID file name is <piddir>/<name>.pid
+ *
+ * @param[in] piddir Directory for PID file
+ * @param[in] name PID file process name
+ */
+void pidfile_create(const char *piddir, const char *name);
+
+/**
+ * @brief Remove a PID file
+ *
+ * PID file name is <piddir>/<name>.pid
+ *
+ * @param[in] piddir Directory for PID file
+ * @param[in] name PID file process name
+ */
+void pidfile_unlink(const char *piddir, const char *name);
+
+#endif