pidfile.h

linux下记录系统日志代码以及记录内核日志代码

/*
    pidfile.h - interact with pidfiles
    Copyright (c) 1995  Martin Schulze <[e-mail]>

    This file is part of the sysklogd package, a kernel and system log daemon.

    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 2 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, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*/

/* read_pid
 *
 * Reads the specified pidfile and returns the read pid.
 * 0 is returned if either there's no pidfile, it's empty
 * or no pid can be read.
 */
int read_pid (char *pidfile);

/* check_pid
 *
 * Reads the pid using read_pid and looks up the pid in the process
 * table (using /proc) to determine if the process already exists. If
 * so 1 is returned, otherwise 0.
 */
int check_pid (char *pidfile);

/* write_pid
 *
 * Writes the pid to the specified file. If that fails 0 is
 * returned, otherwise the pid.
 */
int write_pid (char *pidfile);

/* remove_pid
 *
 * Remove the the specified file. The result from unlink(2)
 * is returned
 */
int remove_pid (char *pidfile);