| Current File : //usr/include/dirent.h |
/* Copyright (C) 1991-2000,2003-2005,2009,2010,2011,2012
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, see
<http://www.gnu.org/licenses/>. */
/*
* POSIX Standard: 5.1.2 Directory Operations <dirent.h>
*/
#ifndef _DIRENT_H
#define _DIRENT_H 1
#include <features.h>
__BEGIN_DECLS
#include <bits/types.h>
#ifdef __USE_XOPEN
# 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
# if defined __USE_LARGEFILE64 && !defined __ino64_t_defined
typedef __ino64_t ino64_t;
# define __ino64_t_defined
# endif
#endif
/* This file defines `struct dirent'.
It defines the macro `_DIRENT_HAVE_D_NAMLEN' iff there is a `d_namlen'
member that gives the length of `d_name'.
It defines the macro `_DIRENT_HAVE_D_RECLEN' iff there is a `d_reclen'
member that gives the size of the entire directory entry.
It defines the macro `_DIRENT_HAVE_D_OFF' iff there is a `d_off'
member that gives the file offset of the next directory entry.
It defines the macro `_DIRENT_HAVE_D_TYPE' iff there is a `d_type'
member that gives the type of the file.
*/
#include <bits/dirent.h>
#if (defined __USE_BSD || defined __USE_MISC) && !defined d_fileno
# define d_ino d_fileno /* Backward compatibility. */
#endif
/* These macros extract size information from a `struct dirent *'.
They may evaluate their argument multiple times, so it must not
have side effects. Each of these may involve a relatively costly
call to `strlen' on some systems, so these values should be cached.
_D_EXACT_NAMLEN (DP) returns the length of DP->d_name, not including
its terminating null character.
_D_ALLOC_NAMLEN (DP) returns a size at least (_D_EXACT_NAMLEN (DP) + 1);
that is, the allocation size needed to hold the DP->d_name string.
Use this macro when you don't need the exact length, just an upper bound.
This macro is less likely to require calling `strlen' than _D_EXACT_NAMLEN.
*/
#ifdef _DIRENT_HAVE_D_NAMLEN
# define _D_EXACT_NAMLEN(d) ((d)->d_namlen)
# define _D_ALLOC_NAMLEN(d) (_D_EXACT_NAMLEN (d) + 1)
#else
# define _D_EXACT_NAMLEN(d) (strlen ((d)->d_name))
# ifdef _DIRENT_HAVE_D_RECLEN
# define _D_ALLOC_NAMLEN(d) (((char *) (d) + (d)->d_reclen) - &(d)->d_name[0])
# else
# define _D_ALLOC_NAMLEN(d) (sizeof (d)->d_name > 1 ? sizeof (d)->d_name : \
_D_EXACT_NAMLEN (d) + 1)
# endif
#endif
#ifdef __USE_BSD
/* File types for `d_type'. */
enum
{
DT_UNKNOWN = 0,
# define DT_UNKNOWN DT_UNKNOWN
DT_FIFO = 1,
# define DT_FIFO DT_FIFO
DT_CHR = 2,
# define DT_CHR DT_CHR
DT_DIR = 4,
# define DT_DIR DT_DIR
DT_BLK = 6,
# define DT_BLK DT_BLK
DT_REG = 8,
# define DT_REG DT_REG
DT_LNK = 10,
# define DT_LNK DT_LNK
DT_SOCK = 12,
# define DT_SOCK DT_SOCK
DT_WHT = 14
# define DT_WHT DT_WHT
};
/* Convert between stat structure types and directory types. */
# define IFTODT(mode) (((mode) & 0170000) >> 12)
# define DTTOIF(dirtype) ((dirtype) << 12)
#endif
/* This is the data type of directory stream objects.
The actual structure is opaque to users. */
typedef struct __dirstream DIR;
/* Open a directory stream on NAME.
Return a DIR stream on the directory, or NULL if it could not be opened.
This function is a possible cancellation point and therefore not
marked with __THROW. */
extern DIR *opendir (const char *__name) __nonnull ((1));
#ifdef __USE_XOPEN2K8
/* Same as opendir, but open the stream on the file descriptor FD.
This function is a possible cancellation point and therefore not
marked with __THROW. */
extern DIR *fdopendir (int __fd);
#endif
/* Close the directory stream DIRP.
Return 0 if successful, -1 if not.
This function is a possible cancellation point and therefore not
marked with __THROW. */
extern int closedir (DIR *__dirp) __nonnull ((1));
/* Read a directory entry from DIRP. Return a pointer to a `struct
dirent' describing the entry, or NULL for EOF or error. The
storage returned may be overwritten by a later readdir call on the
same DIR stream.
If the Large File Support API is selected we have to use the
appropriate interface.
This function is a possible cancellation point and therefore not
marked with __THROW. */
#ifndef __USE_FILE_OFFSET64
extern struct dirent *readdir (DIR *__dirp) __nonnull ((1));
#else
# ifdef __REDIRECT
extern struct dirent *__REDIRECT (readdir, (DIR *__dirp), readdir64)
__nonnull ((1));
# else
# define readdir readdir64
# endif
#endif
#ifdef __USE_LARGEFILE64
extern struct dirent64 *readdir64 (DIR *__dirp) __nonnull ((1));
#endif
#if defined __USE_POSIX || defined __USE_MISC
/* Reentrant version of `readdir'. Return in RESULT a pointer to the
next entry.
This function is a possible cancellation point and therefore not
marked with __THROW. */
# ifndef __USE_FILE_OFFSET64
extern int readdir_r (DIR *__restrict __dirp,
struct dirent *__restrict __entry,
struct dirent **__restrict __result)
__nonnull ((1, 2, 3));
# else
# ifdef __REDIRECT
extern int __REDIRECT (readdir_r,
(DIR *__restrict __dirp,
struct dirent *__restrict __entry,
struct dirent **__restrict __result),
readdir64_r) __nonnull ((1, 2, 3));
# else
# define readdir_r readdir64_r
# endif
# endif
# ifdef __USE_LARGEFILE64
extern int readdir64_r (DIR *__restrict __dirp,
struct dirent64 *__restrict __entry,
struct dirent64 **__restrict __result)
__nonnull ((1, 2, 3));
# endif
#endif /* POSIX or misc */
/* Rewind DIRP to the beginning of the directory. */
extern void rewinddir (DIR *__dirp) __THROW __nonnull ((1));
#if defined __USE_BSD || defined __USE_MISC || defined __USE_XOPEN
# include <bits/types.h>
/* Seek to position POS on DIRP. */
extern void seekdir (DIR *__dirp, long int __pos) __THROW __nonnull ((1));
/* Return the current position of DIRP. */
extern long int telldir (DIR *__dirp) __THROW __nonnull ((1));
#endif
#if defined __USE_BSD || defined __USE_MISC || defined __USE_XOPEN2K8
/* Return the file descriptor used by DIRP. */
extern int dirfd (DIR *__dirp) __THROW __nonnull ((1));
# if defined __OPTIMIZE__ && defined _DIR_dirfd
# define dirfd(dirp) _DIR_dirfd (dirp)
# endif
# if defined __USE_BSD || defined __USE_MISC
# ifndef MAXNAMLEN
/* Get the definitions of the POSIX.1 limits. */
# include <bits/posix1_lim.h>
/* `MAXNAMLEN' is the BSD name for what POSIX calls `NAME_MAX'. */
# ifdef NAME_MAX
# define MAXNAMLEN NAME_MAX
# else
# define MAXNAMLEN 255
# endif
# endif
# endif
# define __need_size_t
# include <stddef.h>
/* Scan the directory DIR, calling SELECTOR on each directory entry.
Entries for which SELECT returns nonzero are individually malloc'd,
sorted using qsort with CMP, and collected in a malloc'd array in
*NAMELIST. Returns the number of entries selected, or -1 on error.
This function is a cancellation point and therefore not marked with
__THROW. */
# ifndef __USE_FILE_OFFSET64
extern int scandir (const char *__restrict __dir,
struct dirent ***__restrict __namelist,
int (*__selector) (const struct dirent *),
int (*__cmp) (const struct dirent **,
const struct dirent **))
__nonnull ((1, 2));
# else
# ifdef __REDIRECT
extern int __REDIRECT (scandir,
(const char *__restrict __dir,
struct dirent ***__restrict __namelist,
int (*__selector) (const struct dirent *),
int (*__cmp) (const struct dirent **,
const struct dirent **)),
scandir64) __nonnull ((1, 2));
# else
# define scandir scandir64
# endif
# endif
# if defined __USE_GNU && defined __USE_LARGEFILE64
/* This function is like `scandir' but it uses the 64bit dirent structure.
Please note that the CMP function must now work with struct dirent64 **. */
extern int scandir64 (const char *__restrict __dir,
struct dirent64 ***__restrict __namelist,
int (*__selector) (const struct dirent64 *),
int (*__cmp) (const struct dirent64 **,
const struct dirent64 **))
__nonnull ((1, 2));
# endif
# ifdef __USE_GNU
/* Similar to `scandir' but a relative DIR name is interpreted relative
to the directory for which DFD is a descriptor.
This function is a cancellation point and therefore not marked with
__THROW. */
# ifndef __USE_FILE_OFFSET64
extern int scandirat (int __dfd, const char *__restrict __dir,
struct dirent ***__restrict __namelist,
int (*__selector) (const struct dirent *),
int (*__cmp) (const struct dirent **,
const struct dirent **))
__nonnull ((2, 3));
# else
# ifdef __REDIRECT
extern int __REDIRECT (scandirat,
(int __dfd, const char *__restrict __dir,
struct dirent ***__restrict __namelist,
int (*__selector) (const struct dirent *),
int (*__cmp) (const struct dirent **,
const struct dirent **)),
scandirat64) __nonnull ((2, 3));
# else
# define scandirat scandirat64
# endif
# endif
/* This function is like `scandir' but it uses the 64bit dirent structure.
Please note that the CMP function must now work with struct dirent64 **. */
extern int scandirat64 (int __dfd, const char *__restrict __dir,
struct dirent64 ***__restrict __namelist,
int (*__selector) (const struct dirent64 *),
int (*__cmp) (const struct dirent64 **,
const struct dirent64 **))
__nonnull ((2, 3));
# endif
/* Function to compare two `struct dirent's alphabetically. */
# ifndef __USE_FILE_OFFSET64
extern int alphasort (const struct dirent **__e1,
const struct dirent **__e2)
__THROW __attribute_pure__ __nonnull ((1, 2));
# else
# ifdef __REDIRECT
extern int __REDIRECT_NTH (alphasort,
(const struct dirent **__e1,
const struct dirent **__e2),
alphasort64) __attribute_pure__ __nonnull ((1, 2));
# else
# define alphasort alphasort64
# endif
# endif
# if defined __USE_GNU && defined __USE_LARGEFILE64
extern int alphasort64 (const struct dirent64 **__e1,
const struct dirent64 **__e2)
__THROW __attribute_pure__ __nonnull ((1, 2));
# endif
#endif /* Use BSD or misc or XPG7. */
#if defined __USE_BSD || defined __USE_MISC
/* Read directory entries from FD into BUF, reading at most NBYTES.
Reading starts at offset *BASEP, and *BASEP is updated with the new
position after reading. Returns the number of bytes read; zero when at
end of directory; or -1 for errors. */
# ifndef __USE_FILE_OFFSET64
extern __ssize_t getdirentries (int __fd, char *__restrict __buf,
size_t __nbytes,
__off_t *__restrict __basep)
__THROW __nonnull ((2, 4));
# else
# ifdef __REDIRECT
extern __ssize_t __REDIRECT_NTH (getdirentries,
(int __fd, char *__restrict __buf,
size_t __nbytes,
__off64_t *__restrict __basep),
getdirentries64) __nonnull ((2, 4));
# else
# define getdirentries getdirentries64
# endif
# endif
# ifdef __USE_LARGEFILE64
extern __ssize_t getdirentries64 (int __fd, char *__restrict __buf,
size_t __nbytes,
__off64_t *__restrict __basep)
__THROW __nonnull ((2, 4));
# endif
#endif /* Use BSD or misc. */
#ifdef __USE_GNU
/* Function to compare two `struct dirent's by name & version. */
# ifndef __USE_FILE_OFFSET64
extern int versionsort (const struct dirent **__e1,
const struct dirent **__e2)
__THROW __attribute_pure__ __nonnull ((1, 2));
# else
# ifdef __REDIRECT
extern int __REDIRECT_NTH (versionsort,
(const struct dirent **__e1,
const struct dirent **__e2),
versionsort64)
__attribute_pure__ __nonnull ((1, 2));
# else
# define versionsort versionsort64
# endif
# endif
# ifdef __USE_LARGEFILE64
extern int versionsort64 (const struct dirent64 **__e1,
const struct dirent64 **__e2)
__THROW __attribute_pure__ __nonnull ((1, 2));
# endif
#endif /* Use GNU. */
__END_DECLS
#endif /* dirent.h */