dpid.h

用来编写 unix 环境下的守护程序的工具库

#ifndef foodaemonpidhfoo
#define foodaemonpidhfoo

/* $Id: dpid.h 101 2005-11-18 20:39:12Z lennart $ */

/*
 * This file is part of libdaemon.
 *
 * libdaemon is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * libdaemon 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with libdaemon; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <sys/types.h>

#ifdef __cplusplus
extern "C" {
#endif

/** \file
 *
 * Contains an API for manipulating PID files. 
 */

/** Prototype of a function for generating the name of a PID file.
 */
typedef const char* (*daemon_pid_file_proc_t)(void);

/** Identification string for the PID file name, only used when
 * daemon_pid_file_proc is set to daemon_pid_file_proc_default(). Use
 * daemon_ident_from_argv0() to generate an identification string from
 * argv[0]
 */
extern const char *daemon_pid_file_ident;

/** A function pointer which is used to generate the name of the PID
 * file to manipulate. Points to daemon_pid_file_proc_default() by
 * default.
 */
extern daemon_pid_file_proc_t daemon_pid_file_proc;

/** A function for creating a pid file name from
 * daemon_pid_file_ident
 * @return The PID file path
 */
const char *daemon_pid_file_proc_default(void);

/** Creates PID pid file for the current process
 * @return zero on success, nonzero on failure
 */
int daemon_pid_file_create(void);

/** Removes the PID file of the current process
 * @return zero on success, nonzero on failure
 */
int daemon_pid_file_remove(void);

/** Returns the PID file of a running daemon, if available 
 * @return The PID or negative on failure
 */
pid_t daemon_pid_file_is_running(void);

/** Kills a running daemon, if available
 * @param s The signal to send
 * @return zero on success, nonzero on failure
 */
int daemon_pid_file_kill(int s);

/** If this variable is defined to 1 iff daemon_pid_file_kill_wait() is supported.*/
#define DAEMON_PID_FILE_KILL_WAIT_AVAILABLE 1

/** Similar to daemon_pid_file_kill() but waits until the process
 * died.  This functions is new in libdaemon 0.3. The macro
 * DAEMON_PID_FILE_KILL_WAIT_AVAILABLE is defined iff libdaemon
 * supports this function.
 * 
 * @param s The signal to send
 * @param m Seconds to wait at maximum
 * @return zero on success, nonzero on failure (timeout condition is considered a failure)
 */
int daemon_pid_file_kill_wait(int s, int m);

#ifdef __cplusplus
}
#endif

#endif