[hcoop/debian/courier-authlib.git] / libs / liblock / lockflock.c

/*
** Copyright 1998 - 1999 Double Precision, Inc.  See COPYING for
** distribution information.
*/

#if	HAVE_CONFIG_H
#include	"config.h"
#endif
#include	<sys/types.h>
#if	HAVE_FCNTL_H
#include	<fcntl.h>
#endif
#if	HAVE_SYS_FCNTL_H
#include	<sys/fcntl.h>
#endif
#if	HAVE_SYS_FILE_H
#include	<sys/file.h>
#endif
#include	<errno.h>
#include	"liblock.h"

int	ll_lockfd(int fd, int ltype, LL_OFFSET_TYPE start, LL_OFFSET_TYPE len)
{
	if (start || len
		|| (ltype & ll_whence_curpos)
		|| (ltype & ll_whence_end))
	{
		errno=EINVAL;
		return (-1);
	}

	return (flock(fd, ltype & ll_unlock ? LOCK_UN:
		(ltype & ll_writelock ? LOCK_EX:LOCK_SH) |
		(ltype & ll_wait ? 0:LOCK_NB)));
}
Commit	Line	Data
d9898ee8	1	/*
	2	** Copyright 1998 - 1999 Double Precision, Inc. See COPYING for
	3	** distribution information.
	4	*/
	5
d9898ee8	6	#if HAVE_CONFIG_H
	7	#include "config.h"
	8	#endif
	9	#include <sys/types.h>
	10	#if HAVE_FCNTL_H
	11	#include <fcntl.h>
	12	#endif
	13	#if HAVE_SYS_FCNTL_H
	14	#include <sys/fcntl.h>
	15	#endif
	16	#if HAVE_SYS_FILE_H
	17	#include <sys/file.h>
	18	#endif
	19	#include <errno.h>
	20	#include "liblock.h"
	21
	22	int ll_lockfd(int fd, int ltype, LL_OFFSET_TYPE start, LL_OFFSET_TYPE len)
	23	{
	24	if (start \|\| len
	25	\|\| (ltype & ll_whence_curpos)
	26	\|\| (ltype & ll_whence_end))
	27	{
	28	errno=EINVAL;
	29	return (-1);
	30	}
	31
	32	return (flock(fd, ltype & ll_unlock ? LOCK_UN:
	33	(ltype & ll_writelock ? LOCK_EX:LOCK_SH) \|
	34	(ltype & ll_wait ? 0:LOCK_NB)));
	35	}