1 files changed, 67 insertions, 0 deletions
diff --git a/gnu/usr.bin/tar/open3.h b/gnu/usr.bin/tar/open3.h
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+++ b/gnu/usr.bin/tar/open3.h
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+/* Defines for Sys V style 3-argument open call.
+   Copyright (C) 1988 Free Software Foundation
+
+This file is part of GNU Tar.
+
+GNU Tar is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Tar is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Tar; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/*
+ * 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