stat.h
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上传日期:2009-04-28
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- /* Copyright (C) 1991,1992,1995-2002,2003,2004 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 Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 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
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- /*
- * POSIX Standard: 5.6 File Characteristics <sys/stat.h>
- */
- #ifndef _SYS_STAT_H
- #define _SYS_STAT_H 1
- #include <features.h>
- #include <bits/types.h> /* For __mode_t and __dev_t. */
- #if defined __USE_XOPEN || defined __USE_MISC
- # if defined __USE_XOPEN || defined __USE_XOPEN2K
- # define __need_time_t
- # endif
- # ifdef __USE_MISC
- # define __need_timespec
- # endif
- # include <time.h> /* For time_t resp. timespec. */
- #endif
- #if defined __USE_XOPEN || defined __USE_XOPEN2K
- /* The Single Unix specification says that some more types are
- available here. */
- # ifndef __dev_t_defined
- typedef __dev_t dev_t;
- # define __dev_t_defined
- # endif
- # ifndef __gid_t_defined
- typedef __gid_t gid_t;
- # define __gid_t_defined
- # endif
- # ifndef __ino_t_defined
- # ifndef __USE_FILE_OFFSET64
- typedef __ino_t ino_t;
- # else
- typedef __ino64_t ino_t;
- # endif
- # define __ino_t_defined
- # endif
- # ifndef __mode_t_defined
- typedef __mode_t mode_t;
- # define __mode_t_defined
- # endif
- # ifndef __nlink_t_defined
- typedef __nlink_t nlink_t;
- # define __nlink_t_defined
- # endif
- # ifndef __off_t_defined
- # ifndef __USE_FILE_OFFSET64
- typedef __off_t off_t;
- # else
- typedef __off64_t off_t;
- # endif
- # define __off_t_defined
- # endif
- # ifndef __uid_t_defined
- typedef __uid_t uid_t;
- # define __uid_t_defined
- # endif
- #endif /* X/Open */
- #ifdef __USE_UNIX98
- # ifndef __blkcnt_t_defined
- # ifndef __USE_FILE_OFFSET64
- typedef __blkcnt_t blkcnt_t;
- # else
- typedef __blkcnt64_t blkcnt_t;
- # endif
- # define __blkcnt_t_defined
- # endif
- # ifndef __blksize_t_defined
- typedef __blksize_t blksize_t;
- # define __blksize_t_defined
- # endif
- #endif /* Unix98 */
- __BEGIN_DECLS
- #include <bits/stat.h>
- #if defined __USE_BSD || defined __USE_MISC || defined __USE_XOPEN
- # define S_IFMT __S_IFMT
- # define S_IFDIR __S_IFDIR
- # define S_IFCHR __S_IFCHR
- # define S_IFBLK __S_IFBLK
- # define S_IFREG __S_IFREG
- # ifdef __S_IFIFO
- # define S_IFIFO __S_IFIFO
- # endif
- # ifdef __S_IFLNK
- # define S_IFLNK __S_IFLNK
- # endif
- # if (defined __USE_BSD || defined __USE_MISC || defined __USE_UNIX98)
- && defined __S_IFSOCK
- # define S_IFSOCK __S_IFSOCK
- # endif
- #endif
- /* Test macros for file types. */
- #define __S_ISTYPE(mode, mask) (((mode) & __S_IFMT) == (mask))
- #define S_ISDIR(mode) __S_ISTYPE((mode), __S_IFDIR)
- #define S_ISCHR(mode) __S_ISTYPE((mode), __S_IFCHR)
- #define S_ISBLK(mode) __S_ISTYPE((mode), __S_IFBLK)
- #define S_ISREG(mode) __S_ISTYPE((mode), __S_IFREG)
- #ifdef __S_IFIFO
- # define S_ISFIFO(mode) __S_ISTYPE((mode), __S_IFIFO)
- #endif
- #ifdef __S_IFLNK
- # define S_ISLNK(mode) __S_ISTYPE((mode), __S_IFLNK)
- #endif
- #if defined __USE_BSD && !defined __S_IFLNK
- # define S_ISLNK(mode) 0
- #endif
- #if (defined __USE_BSD || defined __USE_UNIX98)
- && defined __S_IFSOCK
- # define S_ISSOCK(mode) __S_ISTYPE((mode), __S_IFSOCK)
- #endif
- /* These are from POSIX.1b. If the objects are not implemented using separate
- distinct file types, the macros always will evaluate to zero. Unlike the
- other S_* macros the following three take a pointer to a `struct stat'
- object as the argument. */
- #ifdef __USE_POSIX199309
- # define S_TYPEISMQ(buf) __S_TYPEISMQ(buf)
- # define S_TYPEISSEM(buf) __S_TYPEISSEM(buf)
- # define S_TYPEISSHM(buf) __S_TYPEISSHM(buf)
- #endif
- /* Protection bits. */
- #define S_ISUID __S_ISUID /* Set user ID on execution. */
- #define S_ISGID __S_ISGID /* Set group ID on execution. */
- #if defined __USE_BSD || defined __USE_MISC || defined __USE_XOPEN
- /* Save swapped text after use (sticky bit). This is pretty well obsolete. */
- # define S_ISVTX __S_ISVTX
- #endif
- #define S_IRUSR __S_IREAD /* Read by owner. */
- #define S_IWUSR __S_IWRITE /* Write by owner. */
- #define S_IXUSR __S_IEXEC /* Execute by owner. */
- /* Read, write, and execute by owner. */
- #define S_IRWXU (__S_IREAD|__S_IWRITE|__S_IEXEC)
- #if defined __USE_MISC && defined __USE_BSD
- # define S_IREAD S_IRUSR
- # define S_IWRITE S_IWUSR
- # define S_IEXEC S_IXUSR
- #endif
- #define S_IRGRP (S_IRUSR >> 3) /* Read by group. */
- #define S_IWGRP (S_IWUSR >> 3) /* Write by group. */
- #define S_IXGRP (S_IXUSR >> 3) /* Execute by group. */
- /* Read, write, and execute by group. */
- #define S_IRWXG (S_IRWXU >> 3)
- #define S_IROTH (S_IRGRP >> 3) /* Read by others. */
- #define S_IWOTH (S_IWGRP >> 3) /* Write by others. */
- #define S_IXOTH (S_IXGRP >> 3) /* Execute by others. */
- /* Read, write, and execute by others. */
- #define S_IRWXO (S_IRWXG >> 3)
- #ifdef __USE_BSD
- /* Macros for common mode bit masks. */
- # define ACCESSPERMS (S_IRWXU|S_IRWXG|S_IRWXO) /* 0777 */
- # define ALLPERMS (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO)/* 07777 */
- # define DEFFILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)/* 0666*/
- # define S_BLKSIZE 512 /* Block size for `st_blocks'. */
- #endif
- #ifndef __USE_FILE_OFFSET64
- /* Get file attributes for FILE and put them in BUF. */
- extern int stat (__const char *__restrict __file,
- struct stat *__restrict __buf) __THROW __nonnull ((1, 2));
- /* Get file attributes for the file, device, pipe, or socket
- that file descriptor FD is open on and put them in BUF. */
- extern int fstat (int __fd, struct stat *__buf) __THROW __nonnull ((2));
- #else
- # ifdef __REDIRECT_NTH
- extern int __REDIRECT_NTH (stat, (__const char *__restrict __file,
- struct stat *__restrict __buf), stat64)
- __nonnull ((1, 2));
- extern int __REDIRECT_NTH (fstat, (int __fd, struct stat *__buf), fstat64)
- __nonnull ((2));
- # else
- # define stat stat64
- # define fstat fstat64
- # endif
- #endif
- #ifdef __USE_LARGEFILE64
- extern int stat64 (__const char *__restrict __file,
- struct stat64 *__restrict __buf) __THROW __nonnull ((1, 2));
- extern int fstat64 (int __fd, struct stat64 *__buf) __THROW __nonnull ((2));
- #endif
- #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
- # ifndef __USE_FILE_OFFSET64
- /* Get file attributes about FILE and put them in BUF.
- If FILE is a symbolic link, do not follow it. */
- extern int lstat (__const char *__restrict __file,
- struct stat *__restrict __buf) __THROW __nonnull ((1, 2));
- # else
- # ifdef __REDIRECT_NTH
- extern int __REDIRECT_NTH (lstat,
- (__const char *__restrict __file,
- struct stat *__restrict __buf), lstat64)
- __nonnull ((1, 2));
- # else
- # define lstat lstat64
- # endif
- # endif
- # ifdef __USE_LARGEFILE64
- extern int lstat64 (__const char *__restrict __file,
- struct stat64 *__restrict __buf)
- __THROW __nonnull ((1, 2));
- # endif
- #endif
- /* Set file access permissions for FILE to MODE.
- If FILE is a symbolic link, this affects its target instead. */
- extern int chmod (__const char *__file, __mode_t __mode)
- __THROW __nonnull ((1));
- #ifdef __USE_BSD
- /* Set file access permissions for FILE to MODE.
- If FILE is a symbolic link, this affects the link itself
- rather than its target. */
- extern int lchmod (__const char *__file, __mode_t __mode)
- __THROW __nonnull ((1));
- #endif
- /* Set file access permissions of the file FD is open on to MODE. */
- #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
- extern int fchmod (int __fd, __mode_t __mode) __THROW;
- #endif
- /* Set the file creation mask of the current process to MASK,
- and return the old creation mask. */
- extern __mode_t umask (__mode_t __mask) __THROW;
- #ifdef __USE_GNU
- /* Get the current `umask' value without changing it.
- This function is only available under the GNU Hurd. */
- extern __mode_t getumask (void) __THROW;
- #endif
- /* Create a new directory named PATH, with permission bits MODE. */
- extern int mkdir (__const char *__path, __mode_t __mode)
- __THROW __nonnull ((1));
- /* Create a device file named PATH, with permission and special bits MODE
- and device number DEV (which can be constructed from major and minor
- device numbers with the `makedev' macro above). */
- #if defined __USE_MISC || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
- extern int mknod (__const char *__path, __mode_t __mode, __dev_t __dev)
- __THROW __nonnull ((1));
- #endif
- /* Create a new FIFO named PATH, with permission bits MODE. */
- extern int mkfifo (__const char *__path, __mode_t __mode)
- __THROW __nonnull ((1));
- /* To allow the `struct stat' structure and the file type `mode_t'
- bits to vary without changing shared library major version number,
- the `stat' family of functions and `mknod' are in fact inline
- wrappers around calls to `xstat', `fxstat', `lxstat', and `xmknod',
- which all take a leading version-number argument designating the
- data structure and bits used. <bits/stat.h> defines _STAT_VER with
- the version number corresponding to `struct stat' as defined in
- that file; and _MKNOD_VER with the version number corresponding to
- the S_IF* macros defined therein. It is arranged that when not
- inlined these function are always statically linked; that way a
- dynamically-linked executable always encodes the version number
- corresponding to the data structures it uses, so the `x' functions
- in the shared library can adapt without needing to recompile all
- callers. */
- #ifndef _STAT_VER
- # define _STAT_VER 0
- #endif
- #ifndef _MKNOD_VER
- # define _MKNOD_VER 0
- #endif
- /* Wrappers for stat and mknod system calls. */
- #ifndef __USE_FILE_OFFSET64
- extern int __fxstat (int __ver, int __fildes, struct stat *__stat_buf)
- __THROW __nonnull ((3));
- extern int __xstat (int __ver, __const char *__filename,
- struct stat *__stat_buf) __THROW __nonnull ((2, 3));
- extern int __lxstat (int __ver, __const char *__filename,
- struct stat *__stat_buf) __THROW __nonnull ((2, 3));
- #else
- # ifdef __REDIRECT_NTH
- extern int __REDIRECT_NTH (__fxstat, (int __ver, int __fildes,
- struct stat *__stat_buf), __fxstat64)
- __nonnull ((3));
- extern int __REDIRECT_NTH (__xstat, (int __ver, __const char *__filename,
- struct stat *__stat_buf), __xstat64)
- __nonnull ((2, 3));
- extern int __REDIRECT_NTH (__lxstat, (int __ver, __const char *__filename,
- struct stat *__stat_buf), __lxstat64)
- __nonnull ((2, 3));
- # else
- # define __fxstat __fxstat64
- # define __xstat __xstat64
- # define __lxstat __lxstat64
- # endif
- #endif
- #ifdef __USE_LARGEFILE64
- extern int __fxstat64 (int __ver, int __fildes, struct stat64 *__stat_buf)
- __THROW __nonnull ((3));
- extern int __xstat64 (int __ver, __const char *__filename,
- struct stat64 *__stat_buf) __THROW __nonnull ((2, 3));
- extern int __lxstat64 (int __ver, __const char *__filename,
- struct stat64 *__stat_buf) __THROW __nonnull ((2, 3));
- #endif
- extern int __xmknod (int __ver, __const char *__path, __mode_t __mode,
- __dev_t *__dev) __THROW __nonnull ((2, 4));
- #if defined __GNUC__ && __GNUC__ >= 2
- /* Inlined versions of the real stat and mknod functions. */
- extern __inline__ int
- __NTH (stat (__const char *__path, struct stat *__statbuf))
- {
- return __xstat (_STAT_VER, __path, __statbuf);
- }
- # if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
- extern __inline__ int
- __NTH (lstat (__const char *__path, struct stat *__statbuf))
- {
- return __lxstat (_STAT_VER, __path, __statbuf);
- }
- # endif
- extern __inline__ int
- __NTH (fstat (int __fd, struct stat *__statbuf))
- {
- return __fxstat (_STAT_VER, __fd, __statbuf);
- }
- # if defined __USE_MISC || defined __USE_BSD
- extern __inline__ int
- __NTH (mknod (__const char *__path, __mode_t __mode, __dev_t __dev))
- {
- return __xmknod (_MKNOD_VER, __path, __mode, &__dev);
- }
- # endif
- # if defined __USE_LARGEFILE64
- && (! defined __USE_FILE_OFFSET64
- || (defined __REDIRECT_NTH && defined __OPTIMIZE__))
- extern __inline__ int
- __NTH (stat64 (__const char *__path, struct stat64 *__statbuf))
- {
- return __xstat64 (_STAT_VER, __path, __statbuf);
- }
- # if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
- extern __inline__ int
- __NTH (lstat64 (__const char *__path, struct stat64 *__statbuf))
- {
- return __lxstat64 (_STAT_VER, __path, __statbuf);
- }
- # endif
- extern __inline__ int
- __NTH (fstat64 (int __fd, struct stat64 *__statbuf))
- {
- return __fxstat64 (_STAT_VER, __fd, __statbuf);
- }
- # endif
- #endif
- __END_DECLS
- #endif /* sys/stat.h */