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Use F_GETLK to get the lock holder PID, this is more accurate than reading the file contents: A conflicting process might not have written its PID yet. Also, F_GETLK easily allows to do a retry if the lock holder just died. Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/*
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Unix SMB/CIFS implementation.
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Samba utility functions
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Copyright (C) Jeremy Allison 2012.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _SAMBA_PIDFILE_H_
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#define _SAMBA_PIDFILE_H_
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/**
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* @file pidfile.h
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*
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* @brief PID file handling
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*/
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/**
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* @brief Create a PID file
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*
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* Opens file, locks it, and writes PID. Returns EAGAIN if another
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* process has the PID file locked. Use unlink(2) and
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* pidfile_fd_close() to remove the PID file.
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*
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* @param[in] path PID file name
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* @param[out] outfd File descriptor of open/locked PID file
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* @param[out] existing_pid Return existing PID on EAGAIN
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* @return 0 on success, errno on failure
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*/
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int pidfile_path_create(
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const char *path, int *outfd, pid_t *existing_pid);
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/**
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* @brief Unlock and close a PID file
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*
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* @param[in] fd File descriptor of open/locked PID file
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*/
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void pidfile_fd_close(int fd);
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/**
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* @brief Check a PID file
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*
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* PID file name is <piddir>/<name>.pid
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*
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* @param[in] piddir Directory for PID file
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* @param[in] name PID file process name
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* @return PID of active process, 0 if PID file missing/stale/error
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*/
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pid_t pidfile_pid(const char *piddir, const char *name);
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/**
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* @brief Create a PID file
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*
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* Leave PID file open/locked on success, exit on failure. On
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* success, use pidfile_unlink() to remove PID file before exiting.
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*
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* PID file name is <piddir>/<name>.pid
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*
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* @param[in] piddir Directory for PID file
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* @param[in] name PID file process name
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*/
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void pidfile_create(const char *piddir, const char *name);
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/**
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* @brief Remove a PID file
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*
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* PID file name is <piddir>/<name>.pid
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*
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* @param[in] piddir Directory for PID file
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* @param[in] name PID file process name
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*/
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void pidfile_unlink(const char *piddir, const char *name);
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#endif
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