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295 lines
9.2 KiB
C
295 lines
9.2 KiB
C
8 years ago
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/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/*
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* POSIX Standard: 6.5 File Control Operations <fcntl.h>
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*/
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#ifndef _FCNTL_H
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#define _FCNTL_H 1
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#include <features.h>
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/* This must be early so <bits/fcntl.h> can define types winningly. */
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__BEGIN_DECLS
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/* Get __mode_t, __dev_t and __off_t .*/
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#include <bits/types.h>
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/* Get the definitions of O_*, F_*, FD_*: all the
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numbers and flag bits for `open', `fcntl', et al. */
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#include <bits/fcntl.h>
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/* Detect if open needs mode as a third argument (or for openat as a fourth
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argument). */
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#ifdef __O_TMPFILE
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# define __OPEN_NEEDS_MODE(oflag) \
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(((oflag) & O_CREAT) != 0 || ((oflag) & __O_TMPFILE) == __O_TMPFILE)
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#else
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# define __OPEN_NEEDS_MODE(oflag) (((oflag) & O_CREAT) != 0)
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#endif
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/* POSIX.1-2001 specifies that these types are defined by <fcntl.h>.
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Earlier POSIX standards permitted any type ending in `_t' to be defined
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by any POSIX header, so we don't conditionalize the definitions here. */
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#ifndef __mode_t_defined
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typedef __mode_t mode_t;
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# define __mode_t_defined
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#endif
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#ifndef __off_t_defined
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# ifndef __USE_FILE_OFFSET64
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typedef __off_t off_t;
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# else
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typedef __off64_t off_t;
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# endif
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# define __off_t_defined
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#endif
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#if defined __USE_LARGEFILE64 && !defined __off64_t_defined
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typedef __off64_t off64_t;
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# define __off64_t_defined
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#endif
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#ifndef __pid_t_defined
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typedef __pid_t pid_t;
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# define __pid_t_defined
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#endif
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/* For XPG all symbols from <sys/stat.h> should also be available. */
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#if defined __USE_XOPEN || defined __USE_XOPEN2K8
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# define __need_timespec
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# include <time.h>
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# include <bits/stat.h>
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# define S_IFMT __S_IFMT
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# define S_IFDIR __S_IFDIR
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# define S_IFCHR __S_IFCHR
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# define S_IFBLK __S_IFBLK
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# define S_IFREG __S_IFREG
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# ifdef __S_IFIFO
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# define S_IFIFO __S_IFIFO
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# endif
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# ifdef __S_IFLNK
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# define S_IFLNK __S_IFLNK
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# endif
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# if (defined __USE_UNIX98 || defined __USE_XOPEN2K8) && defined __S_IFSOCK
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# define S_IFSOCK __S_IFSOCK
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# endif
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/* Protection bits. */
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# define S_ISUID __S_ISUID /* Set user ID on execution. */
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# define S_ISGID __S_ISGID /* Set group ID on execution. */
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# if defined __USE_MISC || defined __USE_XOPEN
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/* Save swapped text after use (sticky bit). This is pretty well obsolete. */
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# define S_ISVTX __S_ISVTX
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# endif
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# define S_IRUSR __S_IREAD /* Read by owner. */
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# define S_IWUSR __S_IWRITE /* Write by owner. */
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# define S_IXUSR __S_IEXEC /* Execute by owner. */
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/* Read, write, and execute by owner. */
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# define S_IRWXU (__S_IREAD|__S_IWRITE|__S_IEXEC)
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# define S_IRGRP (S_IRUSR >> 3) /* Read by group. */
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# define S_IWGRP (S_IWUSR >> 3) /* Write by group. */
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# define S_IXGRP (S_IXUSR >> 3) /* Execute by group. */
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/* Read, write, and execute by group. */
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# define S_IRWXG (S_IRWXU >> 3)
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# define S_IROTH (S_IRGRP >> 3) /* Read by others. */
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# define S_IWOTH (S_IWGRP >> 3) /* Write by others. */
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# define S_IXOTH (S_IXGRP >> 3) /* Execute by others. */
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/* Read, write, and execute by others. */
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# define S_IRWXO (S_IRWXG >> 3)
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#endif
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#ifdef __USE_MISC
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# ifndef R_OK /* Verbatim from <unistd.h>. Ugh. */
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/* Values for the second argument to access.
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These may be OR'd together. */
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# define R_OK 4 /* Test for read permission. */
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# define W_OK 2 /* Test for write permission. */
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# define X_OK 1 /* Test for execute permission. */
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# define F_OK 0 /* Test for existence. */
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# endif
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#endif /* Use misc. */
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/* XPG wants the following symbols. <stdio.h> has the same definitions. */
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#if defined __USE_XOPEN || defined __USE_XOPEN2K8
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# define SEEK_SET 0 /* Seek from beginning of file. */
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# define SEEK_CUR 1 /* Seek from current position. */
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# define SEEK_END 2 /* Seek from end of file. */
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#endif /* XPG */
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/* Do the file control operation described by CMD on FD.
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The remaining arguments are interpreted depending on CMD.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern int fcntl (int __fd, int __cmd, ...);
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/* Open FILE and return a new file descriptor for it, or -1 on error.
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OFLAG determines the type of access used. If O_CREAT or O_TMPFILE is set
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in OFLAG, the third argument is taken as a `mode_t', the mode of the
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created file.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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#ifndef __USE_FILE_OFFSET64
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extern int open (const char *__file, int __oflag, ...) __nonnull ((1));
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#else
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# ifdef __REDIRECT
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extern int __REDIRECT (open, (const char *__file, int __oflag, ...), open64)
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__nonnull ((1));
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# else
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# define open open64
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# endif
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#endif
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#ifdef __USE_LARGEFILE64
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extern int open64 (const char *__file, int __oflag, ...) __nonnull ((1));
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#endif
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#ifdef __USE_ATFILE
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/* Similar to `open' but a relative path name is interpreted relative to
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the directory for which FD is a descriptor.
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NOTE: some other `openat' implementation support additional functionality
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through this interface, especially using the O_XATTR flag. This is not
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yet supported here.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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# ifndef __USE_FILE_OFFSET64
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extern int openat (int __fd, const char *__file, int __oflag, ...)
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__nonnull ((2));
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# else
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# ifdef __REDIRECT
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extern int __REDIRECT (openat, (int __fd, const char *__file, int __oflag,
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...), openat64) __nonnull ((2));
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# else
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# define openat openat64
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# endif
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# endif
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# ifdef __USE_LARGEFILE64
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extern int openat64 (int __fd, const char *__file, int __oflag, ...)
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__nonnull ((2));
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# endif
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#endif
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/* Create and open FILE, with mode MODE. This takes an `int' MODE
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argument because that is what `mode_t' will be widened to.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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#ifndef __USE_FILE_OFFSET64
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extern int creat (const char *__file, mode_t __mode) __nonnull ((1));
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#else
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# ifdef __REDIRECT
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extern int __REDIRECT (creat, (const char *__file, mode_t __mode),
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creat64) __nonnull ((1));
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# else
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# define creat creat64
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# endif
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#endif
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#ifdef __USE_LARGEFILE64
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extern int creat64 (const char *__file, mode_t __mode) __nonnull ((1));
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#endif
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#if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
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&& !defined __USE_POSIX))
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/* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
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files consistent. Some systems have them there and some here, and some
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software depends on the macros being defined without including both. */
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/* `lockf' is a simpler interface to the locking facilities of `fcntl'.
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LEN is always relative to the current file position.
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The CMD argument is one of the following. */
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# define F_ULOCK 0 /* Unlock a previously locked region. */
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# define F_LOCK 1 /* Lock a region for exclusive use. */
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# define F_TLOCK 2 /* Test and lock a region for exclusive use. */
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# define F_TEST 3 /* Test a region for other processes locks. */
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# ifndef __USE_FILE_OFFSET64
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extern int lockf (int __fd, int __cmd, off_t __len);
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# else
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# ifdef __REDIRECT
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extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), lockf64);
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# else
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# define lockf lockf64
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# endif
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# endif
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# ifdef __USE_LARGEFILE64
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extern int lockf64 (int __fd, int __cmd, off64_t __len);
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# endif
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#endif
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#ifdef __USE_XOPEN2K
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/* Advice the system about the expected behaviour of the application with
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respect to the file associated with FD. */
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# ifndef __USE_FILE_OFFSET64
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extern int posix_fadvise (int __fd, off_t __offset, off_t __len,
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int __advise) __THROW;
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# else
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# ifdef __REDIRECT_NTH
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extern int __REDIRECT_NTH (posix_fadvise, (int __fd, __off64_t __offset,
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__off64_t __len, int __advise),
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posix_fadvise64);
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# else
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# define posix_fadvise posix_fadvise64
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# endif
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# endif
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# ifdef __USE_LARGEFILE64
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extern int posix_fadvise64 (int __fd, off64_t __offset, off64_t __len,
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int __advise) __THROW;
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# endif
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/* Reserve storage for the data of the file associated with FD.
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This function is a possible cancellation point and therefore not
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marked with __THROW. */
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# ifndef __USE_FILE_OFFSET64
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extern int posix_fallocate (int __fd, off_t __offset, off_t __len);
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# else
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# ifdef __REDIRECT
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extern int __REDIRECT (posix_fallocate, (int __fd, __off64_t __offset,
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__off64_t __len),
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posix_fallocate64);
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# else
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# define posix_fallocate posix_fallocate64
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# endif
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# endif
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# ifdef __USE_LARGEFILE64
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extern int posix_fallocate64 (int __fd, off64_t __offset, off64_t __len);
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# endif
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#endif
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/* Define some inlines helping to catch common problems. */
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#if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function \
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&& defined __va_arg_pack_len
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# include <bits/fcntl2.h>
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#endif
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__END_DECLS
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#endif /* fcntl.h */
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