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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /io/fcntl.h
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initial import
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+/* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+/*
+ * POSIX Standard: 6.5 File Control Operations <fcntl.h>
+ */
+
+#ifndef _FCNTL_H
+
+#define _FCNTL_H 1
+#include <features.h>
+
+/* This must be early so <fcntlbits.h> can define types winningly. */
+__BEGIN_DECLS
+
+/* Get the definitions of O_*, F_*, FD_*: all the
+ numbers and flag bits for `open', `fcntl', et al. */
+#include <fcntlbits.h>
+
+#ifdef __USE_MISC
+#ifndef R_OK /* Verbatim from <unistd.h>. Ugh. */
+/* Values for the second argument to access.
+ These may be OR'd together. */
+#define R_OK 4 /* Test for read permission. */
+#define W_OK 2 /* Test for write permission. */
+#define X_OK 1 /* Test for execute permission. */
+#define F_OK 0 /* Test for existence. */
+#endif
+#endif /* Use misc. */
+
+
+/* Do the file control operation described by CMD on FD.
+ The remaining arguments are interpreted depending on CMD. */
+extern int __fcntl __P ((int __fd, int __cmd, ...));
+extern int fcntl __P ((int __fd, int __cmd, ...));
+
+/* Open FILE and return a new file descriptor for it, or -1 on error.
+ OFLAG determines the type of access used. If O_CREAT is on OFLAG,
+ the third argument is taken as a `mode_t', the mode of the created file. */
+extern int __open __P ((__const char *__file, int __oflag,...));
+extern int open __P ((__const char *__file, int __oflag,...));
+
+/* Create and open FILE, with mode MODE.
+ This takes an `int' MODE argument because that is
+ what `mode_t' will be widened to. */
+extern int creat __P ((__const char *__file, __mode_t __mode));
+
+#ifdef __OPTIMIZE__
+#define creat(file, m) __open((file), O_WRONLY|O_CREAT|O_TRUNC, (m))
+#endif /* Optimizing. */
+
+#if defined (__USE_MISC) && !defined (F_LOCK)
+/* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
+ files consistent. Some systems have them there and some here, and some
+ software depends on the macros being defined without including both. */
+
+/* `lockf' is a simpler interface to the locking facilities of `fcntl'.
+ LEN is always relative to the current file position.
+ The CMD argument is one of the following. */
+
+#define F_ULOCK 0 /* Unlock a previously locked region. */
+#define F_LOCK 1 /* Lock a region for exclusive use. */
+#define F_TLOCK 2 /* Test and lock a region for exclusive use. */
+#define F_TEST 3 /* Test a region for other processes locks. */
+
+extern int lockf __P ((int __fd, int __cmd, __off_t __len));
+#endif
+
+__END_DECLS
+
+#endif /* fcntl.h */