newlib-cygwin/winsup/cygwin/include/sys/file.h

/* This is file FILE.H */
/*
** Copyright (C) 1991 DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954
**
** This file is distributed under the terms listed in the document
** "copying.dj", available from DJ Delorie at the address above.
** A copy of "copying.dj" should accompany this file; if not, a copy
** should be available from where this file was obtained.  This file
** may not be distributed without a verbatim copy of "copying.dj".
**
** This file is distributed WITHOUT ANY WARRANTY; without even the implied
** warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
 * 2003-11-27  Nicholas Wourms  <nwourms@netscape.net>:
 *
 *   Include sys/cdefs.h. Add function prototype for flock().
 *   Add some comments from BSD's header for further clarity.
 *   (L_SET, L_CURR, L_INCR, L_XTND): Redefine as the macros
 *   SEEK_SET, SEEK_CUR, SEEK_CUR, & SEEK_END respectively.
 *   (LOCK_SH,LOCK_EX,LOCK_NB,LOCK_UN): New macros for flock().
*/
#ifndef _FILE_H_
#define _FILE_H_

#include <fcntl.h>

/* Whence values for lseek(); renamed by POSIX 1003.1 */
#define L_SET		SEEK_SET
#define L_CURR		SEEK_CUR
#define L_INCR		SEEK_CUR
#define L_XTND		SEEK_END

/* Including <sys/file.h> always defines flock & macros. */
#if __BSD_VISIBLE - 0 == 0

#define LOCK_SH		0x01		/* shared file lock */
#define LOCK_EX		0x02		/* exclusive file lock */
#define LOCK_NB		0x04		/* don't block when locking */
#define LOCK_UN		0x08		/* unlock file */

#ifdef __cplusplus
extern "C"
{
#endif

extern int flock _PARAMS ((int, int));

#ifdef __cplusplus
}
#endif

#endif

#endif