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/*
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
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