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dirent.h
/* Copyright (C) 1991-2018 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_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_MISC /* 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 #ifdef __USE_POSIX /* 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)) __attribute_deprecated__; # 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)) __attribute_deprecated__; # 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)) __attribute_deprecated__; # endif #endif /* POSIX or misc */ /* Rewind DIRP to the beginning of the directory. */ extern void rewinddir (DIR *__dirp) __THROW __nonnull ((1)); #if 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 #ifdef __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 # ifdef __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 XPG7. */ #ifdef __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 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 */
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