/*

	Copyright (C) 1988 Free Software Foundation

GNU tar is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY.  No author or distributor accepts responsibility to anyone
for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing.
Refer to the GNU tar General Public License for full details.

Everyone is granted permission to copy, modify and redistribute GNU tar,
but only under the conditions described in the GNU tar General Public
License.  A copy of this license is supposed to have been given to you
along with GNU tar so you can know your rights and responsibilities.  It
should be in a file named COPYING.  Among other things, the copyright
notice and this notice must be preserved on all copies.

In other words, go ahead and share GNU tar, but don't try to stop
anyone else from sharing it farther.  Help stamp out software hoarding!
*/

/*
 * @(#)open3.h 1.4 87/11/11
 *
 * open3.h -- #defines for the various flags for the Sys V style 3-argument
 * open() call.  On BSD or System 5, the system already has this in an
 * include file.  This file is needed for V7 and MINIX systems for the
 * benefit of open3() in port.c, a routine that emulates the 3-argument
 * call using system calls available on V7/MINIX. 
 *
 * This file is needed by PD tar even if we aren't using the
 * emulator, since the #defines for O_WRONLY, etc. are used in
 * a couple of places besides the open() calls, (e.g. in the assignment
 * to openflag in extract.c).  We just #include this rather than
 * #ifdef them out.
 *
 * Written 6/10/87 by rmtodd@uokmax (Richard Todd).
 *
 * The names have been changed by John Gilmore, 31 July 1987, since
 * Richard called it "bsdopen", and really this change was introduced in
 * AT&T Unix systems before BSD picked it up.
 */

/* Only one of the next three should be specified */
#define O_RDONLY	 0 /* only allow read */
#define	O_WRONLY	 1 /* only allow write */
#define	O_RDWR		 2 /* both are allowed */

/* The rest of these can be OR-ed in to the above. */
/*
 * O_NDELAY isn't implemented by the emulator.  It's only useful (to tar) on
 * systems that have named pipes anyway; it prevents tar's hanging by
 * opening a named pipe.  We #ifndef it because some systems already have
 * it defined.
 */
#ifndef O_NDELAY
#define O_NDELAY	 4 /* don't block on opening devices that would
			    * block on open -- ignored by emulator. */
#endif
#define O_CREAT		 8 /* create file if needed */
#define O_EXCL		16 /* file cannot already exist */
#define O_TRUNC		32 /* truncate file on open */
#define O_APPEND	64 /* always write at end of file -- ignored by emul */

#ifdef EMUL_OPEN3
/*
 * make emulation transparent to rest of file -- redirect all open() calls
 * to our routine
 */
#define open	open3
#endif