68 lines
2.6 KiB
C
68 lines
2.6 KiB
C
/* Defines for Sys V style 3-argument open call.
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Copyright (C) 1988 Free Software Foundation
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This file is part of GNU Tar.
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GNU Tar is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Tar is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Tar; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*
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* open3.h -- #defines for the various flags for the Sys V style 3-argument
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* open() call. On BSD or System 5, the system already has this in an
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* include file. This file is needed for V7 and MINIX systems for the
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* benefit of open3() in port.c, a routine that emulates the 3-argument
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* call using system calls available on V7/MINIX.
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*
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* This file is needed by PD tar even if we aren't using the
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* emulator, since the #defines for O_WRONLY, etc. are used in
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* a couple of places besides the open() calls, (e.g. in the assignment
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* to openflag in extract.c). We just #include this rather than
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* #ifdef them out.
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*
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* Written 6/10/87 by rmtodd@uokmax (Richard Todd).
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*
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* The names have been changed by John Gilmore, 31 July 1987, since
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* Richard called it "bsdopen", and really this change was introduced in
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* AT&T Unix systems before BSD picked it up.
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*/
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/* Only one of the next three should be specified */
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#define O_RDONLY 0 /* only allow read */
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#define O_WRONLY 1 /* only allow write */
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#define O_RDWR 2 /* both are allowed */
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/* The rest of these can be OR-ed in to the above. */
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/*
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* O_NDELAY isn't implemented by the emulator. It's only useful (to tar) on
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* systems that have named pipes anyway; it prevents tar's hanging by
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* opening a named pipe. We #ifndef it because some systems already have
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* it defined.
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*/
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#ifndef O_NDELAY
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#define O_NDELAY 4 /* don't block on opening devices that would
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* block on open -- ignored by emulator. */
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#endif
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#define O_CREAT 8 /* create file if needed */
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#define O_EXCL 16 /* file cannot already exist */
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#define O_TRUNC 32 /* truncate file on open */
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#define O_APPEND 64 /* always write at end of file -- ignored by emul */
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#ifdef EMUL_OPEN3
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/*
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* make emulation transparent to rest of file -- redirect all open() calls
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* to our routine
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*/
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#define open open3
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#endif
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