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Dogcows Code - chaz/tar/blob - src/open3.h
1 /* Defines for Sys V style 3-argument open call.
2 Copyright (C) 1988 Free Software Foundation
4 This file is part of GNU Tar.
6 GNU Tar is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Tar is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Tar; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 * @(#)open3.h 1.4 87/11/11
23 * open3.h -- #defines for the various flags for the Sys V style 3-argument
24 * open() call. On BSD or System 5, the system already has this in an
25 * include file. This file is needed for V7 and MINIX systems for the
26 * benefit of open3() in port.c, a routine that emulates the 3-argument
27 * call using system calls available on V7/MINIX.
29 * This file is needed by PD tar even if we aren't using the
30 * emulator, since the #defines for O_WRONLY, etc. are used in
31 * a couple of places besides the open() calls, (e.g. in the assignment
32 * to openflag in extract.c). We just #include this rather than
35 * Written 6/10/87 by rmtodd@uokmax (Richard Todd).
37 * The names have been changed by John Gilmore, 31 July 1987, since
38 * Richard called it "bsdopen", and really this change was introduced in
39 * AT&T Unix systems before BSD picked it up.
42 /* Only one of the next three should be specified */
43 #define O_RDONLY 0 /* only allow read */
44 #define O_WRONLY 1 /* only allow write */
45 #define O_RDWR 2 /* both are allowed */
47 /* The rest of these can be OR-ed in to the above. */
49 * O_NDELAY isn't implemented by the emulator. It's only useful (to tar) on
50 * systems that have named pipes anyway; it prevents tar's hanging by
51 * opening a named pipe. We #ifndef it because some systems already have
55 #define O_NDELAY 4 /* don't block on opening devices that would
56 * block on open -- ignored by emulator. */
58 #define O_CREAT 8 /* create file if needed */
59 #define O_EXCL 16 /* file cannot already exist */
60 #define O_TRUNC 32 /* truncate file on open */
61 #define O_APPEND 64 /* always write at end of file -- ignored by emul */
65 * make emulation transparent to rest of file -- redirect all open() calls
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