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405 lines
12 KiB
C
405 lines
12 KiB
C
/* Copyright (C) 1991-2019 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: 5.1.2 Directory Operations <dirent.h>
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*/
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#ifndef _DIRENT_H
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#define _DIRENT_H 1
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#include <features.h>
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__BEGIN_DECLS
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#include <bits/types.h>
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#ifdef __USE_XOPEN
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# ifndef __ino_t_defined
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# ifndef __USE_FILE_OFFSET64
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typedef __ino_t ino_t;
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# else
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typedef __ino64_t ino_t;
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# endif
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# define __ino_t_defined
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# endif
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# if defined __USE_LARGEFILE64 && !defined __ino64_t_defined
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typedef __ino64_t ino64_t;
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# define __ino64_t_defined
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# endif
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#endif
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/* This file defines `struct dirent'.
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It defines the macro `_DIRENT_HAVE_D_NAMLEN' iff there is a `d_namlen'
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member that gives the length of `d_name'.
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It defines the macro `_DIRENT_HAVE_D_RECLEN' iff there is a `d_reclen'
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member that gives the size of the entire directory entry.
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It defines the macro `_DIRENT_HAVE_D_OFF' iff there is a `d_off'
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member that gives the file offset of the next directory entry.
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It defines the macro `_DIRENT_HAVE_D_TYPE' iff there is a `d_type'
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member that gives the type of the file.
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*/
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#include <bits/dirent.h>
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#if defined __USE_MISC && !defined d_fileno
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# define d_ino d_fileno /* Backward compatibility. */
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#endif
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/* These macros extract size information from a `struct dirent *'.
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They may evaluate their argument multiple times, so it must not
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have side effects. Each of these may involve a relatively costly
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call to `strlen' on some systems, so these values should be cached.
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_D_EXACT_NAMLEN (DP) returns the length of DP->d_name, not including
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its terminating null character.
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_D_ALLOC_NAMLEN (DP) returns a size at least (_D_EXACT_NAMLEN (DP) + 1);
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that is, the allocation size needed to hold the DP->d_name string.
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Use this macro when you don't need the exact length, just an upper bound.
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This macro is less likely to require calling `strlen' than _D_EXACT_NAMLEN.
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*/
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#ifdef _DIRENT_HAVE_D_NAMLEN
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# define _D_EXACT_NAMLEN(d) ((d)->d_namlen)
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# define _D_ALLOC_NAMLEN(d) (_D_EXACT_NAMLEN (d) + 1)
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#else
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# define _D_EXACT_NAMLEN(d) (strlen ((d)->d_name))
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# ifdef _DIRENT_HAVE_D_RECLEN
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# define _D_ALLOC_NAMLEN(d) (((char *) (d) + (d)->d_reclen) - &(d)->d_name[0])
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# else
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# define _D_ALLOC_NAMLEN(d) (sizeof (d)->d_name > 1 ? sizeof (d)->d_name : \
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_D_EXACT_NAMLEN (d) + 1)
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# endif
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#endif
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#ifdef __USE_MISC
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/* File types for `d_type'. */
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enum
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{
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DT_UNKNOWN = 0,
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# define DT_UNKNOWN DT_UNKNOWN
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DT_FIFO = 1,
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# define DT_FIFO DT_FIFO
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DT_CHR = 2,
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# define DT_CHR DT_CHR
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DT_DIR = 4,
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# define DT_DIR DT_DIR
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DT_BLK = 6,
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# define DT_BLK DT_BLK
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DT_REG = 8,
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# define DT_REG DT_REG
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DT_LNK = 10,
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# define DT_LNK DT_LNK
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DT_SOCK = 12,
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# define DT_SOCK DT_SOCK
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DT_WHT = 14
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# define DT_WHT DT_WHT
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};
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/* Convert between stat structure types and directory types. */
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# define IFTODT(mode) (((mode) & 0170000) >> 12)
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# define DTTOIF(dirtype) ((dirtype) << 12)
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#endif
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/* This is the data type of directory stream objects.
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The actual structure is opaque to users. */
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typedef struct __dirstream DIR;
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/* Open a directory stream on NAME.
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Return a DIR stream on the directory, or NULL if it could not be opened.
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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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extern DIR *opendir (const char *__name) __nonnull ((1));
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#ifdef __USE_XOPEN2K8
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/* Same as opendir, but open the stream on the file descriptor 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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extern DIR *fdopendir (int __fd);
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#endif
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/* Close the directory stream DIRP.
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Return 0 if successful, -1 if not.
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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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extern int closedir (DIR *__dirp) __nonnull ((1));
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/* Read a directory entry from DIRP. Return a pointer to a `struct
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dirent' describing the entry, or NULL for EOF or error. The
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storage returned may be overwritten by a later readdir call on the
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same DIR stream.
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If the Large File Support API is selected we have to use the
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appropriate interface.
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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 struct dirent *readdir (DIR *__dirp) __nonnull ((1));
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#else
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# ifdef __REDIRECT
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extern struct dirent *__REDIRECT (readdir, (DIR *__dirp), readdir64)
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__nonnull ((1));
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# else
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# define readdir readdir64
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# endif
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#endif
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#ifdef __USE_LARGEFILE64
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extern struct dirent64 *readdir64 (DIR *__dirp) __nonnull ((1));
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#endif
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#ifdef __USE_POSIX
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/* Reentrant version of `readdir'. Return in RESULT a pointer to the
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next entry.
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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 readdir_r (DIR *__restrict __dirp,
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struct dirent *__restrict __entry,
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struct dirent **__restrict __result)
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__nonnull ((1, 2, 3)) __attribute_deprecated__;
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# else
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# ifdef __REDIRECT
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extern int __REDIRECT (readdir_r,
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(DIR *__restrict __dirp,
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struct dirent *__restrict __entry,
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struct dirent **__restrict __result),
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readdir64_r)
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__nonnull ((1, 2, 3)) __attribute_deprecated__;
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# else
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# define readdir_r readdir64_r
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# endif
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# endif
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# ifdef __USE_LARGEFILE64
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extern int readdir64_r (DIR *__restrict __dirp,
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struct dirent64 *__restrict __entry,
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struct dirent64 **__restrict __result)
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__nonnull ((1, 2, 3)) __attribute_deprecated__;
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# endif
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#endif /* POSIX or misc */
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/* Rewind DIRP to the beginning of the directory. */
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extern void rewinddir (DIR *__dirp) __THROW __nonnull ((1));
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#if defined __USE_MISC || defined __USE_XOPEN
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# include <bits/types.h>
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/* Seek to position POS on DIRP. */
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extern void seekdir (DIR *__dirp, long int __pos) __THROW __nonnull ((1));
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/* Return the current position of DIRP. */
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extern long int telldir (DIR *__dirp) __THROW __nonnull ((1));
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#endif
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#ifdef __USE_XOPEN2K8
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/* Return the file descriptor used by DIRP. */
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extern int dirfd (DIR *__dirp) __THROW __nonnull ((1));
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# if defined __OPTIMIZE__ && defined _DIR_dirfd
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# define dirfd(dirp) _DIR_dirfd (dirp)
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# endif
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# ifdef __USE_MISC
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# ifndef MAXNAMLEN
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/* Get the definitions of the POSIX.1 limits. */
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# include <bits/posix1_lim.h>
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/* `MAXNAMLEN' is the BSD name for what POSIX calls `NAME_MAX'. */
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# ifdef NAME_MAX
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# define MAXNAMLEN NAME_MAX
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# else
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# define MAXNAMLEN 255
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# endif
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# endif
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# endif
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# define __need_size_t
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# include <stddef.h>
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/* Scan the directory DIR, calling SELECTOR on each directory entry.
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Entries for which SELECT returns nonzero are individually malloc'd,
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sorted using qsort with CMP, and collected in a malloc'd array in
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*NAMELIST. Returns the number of entries selected, or -1 on error.
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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 scandir (const char *__restrict __dir,
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struct dirent ***__restrict __namelist,
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int (*__selector) (const struct dirent *),
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int (*__cmp) (const struct dirent **,
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const struct dirent **))
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__nonnull ((1, 2));
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# else
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# ifdef __REDIRECT
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extern int __REDIRECT (scandir,
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(const char *__restrict __dir,
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struct dirent ***__restrict __namelist,
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int (*__selector) (const struct dirent *),
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int (*__cmp) (const struct dirent **,
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const struct dirent **)),
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scandir64) __nonnull ((1, 2));
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# else
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# define scandir scandir64
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# endif
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# endif
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# if defined __USE_GNU && defined __USE_LARGEFILE64
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/* This function is like `scandir' but it uses the 64bit dirent structure.
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Please note that the CMP function must now work with struct dirent64 **. */
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extern int scandir64 (const char *__restrict __dir,
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struct dirent64 ***__restrict __namelist,
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int (*__selector) (const struct dirent64 *),
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int (*__cmp) (const struct dirent64 **,
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const struct dirent64 **))
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__nonnull ((1, 2));
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# endif
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# ifdef __USE_GNU
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/* Similar to `scandir' but a relative DIR name is interpreted relative
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to the directory for which DFD is a descriptor.
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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 scandirat (int __dfd, const char *__restrict __dir,
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struct dirent ***__restrict __namelist,
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int (*__selector) (const struct dirent *),
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int (*__cmp) (const struct dirent **,
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const struct dirent **))
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__nonnull ((2, 3));
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# else
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# ifdef __REDIRECT
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extern int __REDIRECT (scandirat,
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(int __dfd, const char *__restrict __dir,
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struct dirent ***__restrict __namelist,
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int (*__selector) (const struct dirent *),
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int (*__cmp) (const struct dirent **,
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const struct dirent **)),
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scandirat64) __nonnull ((2, 3));
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# else
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# define scandirat scandirat64
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# endif
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# endif
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/* This function is like `scandir' but it uses the 64bit dirent structure.
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Please note that the CMP function must now work with struct dirent64 **. */
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extern int scandirat64 (int __dfd, const char *__restrict __dir,
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struct dirent64 ***__restrict __namelist,
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int (*__selector) (const struct dirent64 *),
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int (*__cmp) (const struct dirent64 **,
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const struct dirent64 **))
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__nonnull ((2, 3));
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# endif
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/* Function to compare two `struct dirent's alphabetically. */
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# ifndef __USE_FILE_OFFSET64
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extern int alphasort (const struct dirent **__e1,
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const struct dirent **__e2)
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__THROW __attribute_pure__ __nonnull ((1, 2));
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# else
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# ifdef __REDIRECT
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extern int __REDIRECT_NTH (alphasort,
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(const struct dirent **__e1,
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const struct dirent **__e2),
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alphasort64) __attribute_pure__ __nonnull ((1, 2));
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# else
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# define alphasort alphasort64
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# endif
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# endif
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# if defined __USE_GNU && defined __USE_LARGEFILE64
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extern int alphasort64 (const struct dirent64 **__e1,
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const struct dirent64 **__e2)
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__THROW __attribute_pure__ __nonnull ((1, 2));
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# endif
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#endif /* Use XPG7. */
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#ifdef __USE_MISC
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/* Read directory entries from FD into BUF, reading at most NBYTES.
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Reading starts at offset *BASEP, and *BASEP is updated with the new
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position after reading. Returns the number of bytes read; zero when at
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end of directory; or -1 for errors. */
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# ifndef __USE_FILE_OFFSET64
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extern __ssize_t getdirentries (int __fd, char *__restrict __buf,
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size_t __nbytes,
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__off_t *__restrict __basep)
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__THROW __nonnull ((2, 4));
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# else
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# ifdef __REDIRECT
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extern __ssize_t __REDIRECT_NTH (getdirentries,
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(int __fd, char *__restrict __buf,
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size_t __nbytes,
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__off64_t *__restrict __basep),
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getdirentries64) __nonnull ((2, 4));
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# else
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# define getdirentries getdirentries64
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# endif
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# endif
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# ifdef __USE_LARGEFILE64
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extern __ssize_t getdirentries64 (int __fd, char *__restrict __buf,
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size_t __nbytes,
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__off64_t *__restrict __basep)
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__THROW __nonnull ((2, 4));
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# endif
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#endif /* Use misc. */
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#ifdef __USE_GNU
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/* Function to compare two `struct dirent's by name & version. */
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# ifndef __USE_FILE_OFFSET64
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extern int versionsort (const struct dirent **__e1,
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const struct dirent **__e2)
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__THROW __attribute_pure__ __nonnull ((1, 2));
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# else
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# ifdef __REDIRECT
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extern int __REDIRECT_NTH (versionsort,
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(const struct dirent **__e1,
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const struct dirent **__e2),
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versionsort64)
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__attribute_pure__ __nonnull ((1, 2));
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# else
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# define versionsort versionsort64
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# endif
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# endif
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# ifdef __USE_LARGEFILE64
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extern int versionsort64 (const struct dirent64 **__e1,
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const struct dirent64 **__e2)
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__THROW __attribute_pure__ __nonnull ((1, 2));
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# endif
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#endif /* Use GNU. */
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__END_DECLS
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#endif /* dirent.h */
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