daemon.c File Reference

Unix daemon management. More...

#include <signal.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <yaz/daemon.h>
#include <yaz/log.h>
#include <yaz/snprintf.h>

Go to the source code of this file.

Functions
int	yaz_daemon (const char *progname, unsigned int flags, void(*work)(void *data), void *data, const char *pidfile, const char *uid)
	daemon utility.

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Detailed Description

Unix daemon management.

Definition in file daemon.c.

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Function Documentation

int yaz_daemon	(	const char *	progname,
		unsigned int	flags,
		void(*)(void *data)	work,
		void *	data,
		const char *	pidfile,
		const char *	uid
	)

daemon utility.

Parameters:

	progname	program name for logging purposes.
	flags	flags which is a bit-wise combination of YAZ_DAEMON_..
	work	working handler (which may be running in different process)
	data	opaque data to be passed to work handler
	pidfile	filename with Process-ID (NULL for no file)
	uid	effective user ID for handler (NULL for no same as caller)

Returns:

0 for success, non-zero for failure.

This function puts calls work handler which is supposed to carry out a daemon service with a possible changed User ID and in a child process.

Flag YAZ_DAEMON_FORK: Puts the service in the background on Unix.

Flag YAZ_DAEMON_DEBUG: Puts the service in debug mode (no fork at all).

Flag YAZ_DAEMON_KEEPALIVE: Repeatedly calls work handler if it makes a "fatal" error.

Definition at line 160 of file daemon.c.

References YAZ_DAEMON_DEBUG, YAZ_DAEMON_FORK, YAZ_DAEMON_KEEPALIVE, yaz_log(), YLOG_ERRNO, and YLOG_FATAL.