libc/include/dirent.h - android_bionic - Gitiles

 /*
  * Copyright (C) 2008 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */

 #pragma once

 /**
  * @file dirent.h
  * @brief Directory entry iteration.
  */

 #include <stdint.h>
 #include <sys/cdefs.h>
 #include <sys/types.h>

 __BEGIN_DECLS

 /** d_type value when the type is not known. */
 #define DT_UNKNOWN 0
 /** d_type value for a FIFO. */
 #define DT_FIFO 1
 /** d_type value for a character device. */
 #define DT_CHR 2
 /** d_type value for a directory. */
 #define DT_DIR 4
 /** d_type value for a block device. */
 #define DT_BLK 6
 /** d_type value for a regular file. */
 #define DT_REG 8
 /** d_type value for a symbolic link. */
 #define DT_LNK 10
 /** d_type value for a socket. */
 #define DT_SOCK 12
 #define DT_WHT 14

 #if defined(__LP64__)
 #define __DIRENT64_INO_T ino_t
 #else
 #define __DIRENT64_INO_T uint64_t /* Historical accident. */
 #endif

 #define __DIRENT64_BODY \
     __DIRENT64_INO_T d_ino; \
     off64_t d_off; \
     unsigned short d_reclen; \
     unsigned char d_type; \
     char d_name[256]; \

 /** The structure returned by readdir(). Identical to dirent64 on Android. */
 struct dirent { __DIRENT64_BODY };
 /** The structure returned by readdir64(). Identical to dirent on Android. */
 struct dirent64 { __DIRENT64_BODY };

 #undef __DIRENT64_BODY
 #undef __DIRENT64_INO_T

 /* glibc compatibility. */
 #undef _DIRENT_HAVE_D_NAMLEN /* Linux doesn't have a d_namlen field. */
 #define _DIRENT_HAVE_D_RECLEN
 #define _DIRENT_HAVE_D_OFF
 #define _DIRENT_HAVE_D_TYPE

 #define d_fileno d_ino

 /** The structure returned by opendir()/fopendir(). */
 typedef struct DIR DIR;

 /**
  * [opendir(3)](http://man7.org/linux/man-pages/man3/opendir.3.html)
  * opens a directory stream for the directory at `__path`.
  *
  * Returns null and sets `errno` on failure.
  */
 DIR* opendir(const char* __path);

 /**
  * [fopendir(3)](http://man7.org/linux/man-pages/man3/opendir.3.html)
  * opens a directory stream for the directory at `__dir_fd`.
  *
  * Returns null and sets `errno` on failure.
  */
 DIR* fdopendir(int __dir_fd);

 /**
  * [readdir(3)](http://man7.org/linux/man-pages/man3/readdir.3.html)
  * returns the next directory entry in the given directory.
  *
  * Returns a pointer to a directory entry on success,
  * or returns null and leaves `errno` unchanged at the end of the directory,
  * or returns null and sets `errno` on failure.
  */
 struct dirent* readdir(DIR* __dir);

 /**
  * [readdir64(3)](http://man7.org/linux/man-pages/man3/readdir.3.html)
  * returns the next directory entry in the given directory.
  *
  * Returns a pointer to a directory entry on success,
  * or returns null and leaves `errno` unchanged at the end of the directory,
  * or returns null and sets `errno` on failure.
  */
 struct dirent64* readdir64(DIR* __dir) __INTRODUCED_IN(21);

 int readdir_r(DIR* __dir, struct dirent* __entry, struct dirent** __buffer) __attribute__((__deprecated__("readdir_r is deprecated; use readdir instead")));
 int readdir64_r(DIR* __dir, struct dirent64* __entry, struct dirent64** __buffer) __INTRODUCED_IN(21) __attribute__((__deprecated__("readdir64_r is deprecated; use readdir64 instead")));

 /**
  * [closedir(3)](http://man7.org/linux/man-pages/man3/closedir.3.html)
  * closes a directory stream.
  *
  * Returns 0 on success and returns -1 and sets `errno` on failure.
  */
 int closedir(DIR* __dir);

 /**
  * [rewinddir(3)](http://man7.org/linux/man-pages/man3/rewinddir.3.html)
  * rewinds a directory stream to the first entry.
  */
 void rewinddir(DIR* __dir);

 /**
  * [seekdir(3)](http://man7.org/linux/man-pages/man3/seekdir.3.html)
  * seeks a directory stream to the given entry, which must be a value returned
  * by telldir().
  *
  * Available since API level 23.
  */
 void seekdir(DIR* __dir, long __location) __INTRODUCED_IN(23);

 /**
  * [telldir(3)](http://man7.org/linux/man-pages/man3/telldir.3.html)
  * returns a value representing the current position in the directory
  * for use with seekdir().
  *
  * Returns the current position on success and returns -1 and sets `errno` on failure.
  *
  * Available since API level 23.
  */
 long telldir(DIR* __dir) __INTRODUCED_IN(23);

 /**
  * [dirfd(3)](http://man7.org/linux/man-pages/man3/dirfd.3.html)
  * returns the file descriptor backing the given directory stream.
  *
  * Returns a file descriptor on success and returns -1 and sets `errno` on failure.
  */
 int dirfd(DIR* __dir);

 /**
  * [alphasort](http://man7.org/linux/man-pages/man3/alphasort.3.html) is a
  * comparator for use with scandir() that uses strcoll().
  */
 int alphasort(const struct dirent** __lhs, const struct dirent** __rhs);

 /**
  * [alphasort64](http://man7.org/linux/man-pages/man3/alphasort.3.html) is a
  * comparator for use with scandir64() that uses strcmp().
  *
  * Available since API level 21.
  */
 int alphasort64(const struct dirent64** __lhs, const struct dirent64** __rhs) __INTRODUCED_IN(21);

 /**
  * [scandir(3)](http://man7.org/linux/man-pages/man3/scandir.3.html)
  * scans all the directory `__path`, filtering entries with `__filter` and
  * sorting them with qsort() using the given `__comparator`, and storing them
  * into `__name_list`. Passing NULL as the filter accepts all entries.
  *
  * Returns the number of entries returned in the list on success,
  * and returns -1 and sets `errno` on failure.
  */
 int scandir(const char* __path, struct dirent*** __name_list, int (*__filter)(const struct dirent*), int (*__comparator)(const struct dirent**, const struct dirent**));

 /**
  * [scandir64(3)](http://man7.org/linux/man-pages/man3/scandir.3.html)
  * scans all the directory `__path`, filtering entries with `__filter` and
  * sorting them with qsort() using the given `__comparator`, and storing them
  * into `__name_list`. Passing NULL as the filter accepts all entries.
  *
  * Returns the number of entries returned in the list on success,
  * and returns -1 and sets `errno` on failure.
  *
  * Available since API level 21.
  */
 int scandir64(const char* __path, struct dirent64*** __name_list, int (*__filter)(const struct dirent64*), int (*__comparator)(const struct dirent64**, const struct dirent64**)) __INTRODUCED_IN(21);

 #if defined(__USE_GNU)

 /**
  * [scandirat64(3)](http://man7.org/linux/man-pages/man3/scandirat.3.html)
  * scans all the directory referenced by the pair of `__dir_fd` and `__path`,
  * filtering entries with `__filter` and sorting them with qsort() using the
  * given `__comparator`, and storing them into `__name_list`. Passing NULL as
  * the filter accepts all entries.
  *
  * Returns the number of entries returned in the list on success,
  * and returns -1 and sets `errno` on failure.
  *
  * Available since API level 24.
  */
 int scandirat64(int __dir_fd, const char* __path, struct dirent64*** __name_list, int (*__filter)(const struct dirent64*), int (*__comparator)(const struct dirent64**, const struct dirent64**)) __INTRODUCED_IN(24);

 /**
  * [scandirat(3)](http://man7.org/linux/man-pages/man3/scandirat.3.html)
  * scans all the directory referenced by the pair of `__dir_fd` and `__path`,
  * filtering entries with `__filter` and sorting them with qsort() using the
  * given `__comparator`, and storing them into `__name_list`. Passing NULL as
  * the filter accepts all entries.
  *
  * Returns the number of entries returned in the list on success,
  * and returns -1 and sets `errno` on failure.
  *
  * Available since API level 24.
  */
 int scandirat(int __dir_fd, const char* __path, struct dirent*** __name_list, int (*__filter)(const struct dirent*), int (*__comparator)(const struct dirent**, const struct dirent**)) __INTRODUCED_IN(24);

 #endif

 __END_DECLS
	/*
	* Copyright (C) 2008 The Android Open Source Project
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
	* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
	* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
	* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
	* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
	* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/

	#pragma once

	/**
	* @file dirent.h
	* @brief Directory entry iteration.
	*/

	#include <stdint.h>
	#include <sys/cdefs.h>
	#include <sys/types.h>

	__BEGIN_DECLS

	/** d_type value when the type is not known. */
	#define DT_UNKNOWN 0
	/** d_type value for a FIFO. */
	#define DT_FIFO 1
	/** d_type value for a character device. */
	#define DT_CHR 2
	/** d_type value for a directory. */
	#define DT_DIR 4
	/** d_type value for a block device. */
	#define DT_BLK 6
	/** d_type value for a regular file. */
	#define DT_REG 8
	/** d_type value for a symbolic link. */
	#define DT_LNK 10
	/** d_type value for a socket. */
	#define DT_SOCK 12
	#define DT_WHT 14

	#if defined(__LP64__)
	#define __DIRENT64_INO_T ino_t
	#else
	#define __DIRENT64_INO_T uint64_t /* Historical accident. */
	#endif

	#define __DIRENT64_BODY \
	__DIRENT64_INO_T d_ino; \
	off64_t d_off; \
	unsigned short d_reclen; \
	unsigned char d_type; \
	char d_name[256]; \

	/** The structure returned by readdir(). Identical to dirent64 on Android. */
	struct dirent { __DIRENT64_BODY };
	/** The structure returned by readdir64(). Identical to dirent on Android. */
	struct dirent64 { __DIRENT64_BODY };

	#undef __DIRENT64_BODY
	#undef __DIRENT64_INO_T

	/* glibc compatibility. */
	#undef _DIRENT_HAVE_D_NAMLEN /* Linux doesn't have a d_namlen field. */
	#define _DIRENT_HAVE_D_RECLEN
	#define _DIRENT_HAVE_D_OFF
	#define _DIRENT_HAVE_D_TYPE

	#define d_fileno d_ino

	/** The structure returned by opendir()/fopendir(). */
	typedef struct DIR DIR;

	/**
	* [opendir(3)](http://man7.org/linux/man-pages/man3/opendir.3.html)
	* opens a directory stream for the directory at `__path`.
	*
	* Returns null and sets `errno` on failure.
	*/
	DIR* opendir(const char* __path);

	/**
	* [fopendir(3)](http://man7.org/linux/man-pages/man3/opendir.3.html)
	* opens a directory stream for the directory at `__dir_fd`.
	*
	* Returns null and sets `errno` on failure.
	*/
	DIR* fdopendir(int __dir_fd);

	/**
	* [readdir(3)](http://man7.org/linux/man-pages/man3/readdir.3.html)
	* returns the next directory entry in the given directory.
	*
	* Returns a pointer to a directory entry on success,
	* or returns null and leaves `errno` unchanged at the end of the directory,
	* or returns null and sets `errno` on failure.
	*/
	struct dirent* readdir(DIR* __dir);

	/**
	* [readdir64(3)](http://man7.org/linux/man-pages/man3/readdir.3.html)
	* returns the next directory entry in the given directory.
	*
	* Returns a pointer to a directory entry on success,
	* or returns null and leaves `errno` unchanged at the end of the directory,
	* or returns null and sets `errno` on failure.
	*/
	struct dirent64* readdir64(DIR* __dir) __INTRODUCED_IN(21);

	int readdir_r(DIR* __dir, struct dirent* __entry, struct dirent** __buffer) __attribute__((__deprecated__("readdir_r is deprecated; use readdir instead")));
	int readdir64_r(DIR* __dir, struct dirent64* __entry, struct dirent64** __buffer) __INTRODUCED_IN(21) __attribute__((__deprecated__("readdir64_r is deprecated; use readdir64 instead")));

	/**
	* [closedir(3)](http://man7.org/linux/man-pages/man3/closedir.3.html)
	* closes a directory stream.
	*
	* Returns 0 on success and returns -1 and sets `errno` on failure.
	*/
	int closedir(DIR* __dir);

	/**
	* [rewinddir(3)](http://man7.org/linux/man-pages/man3/rewinddir.3.html)
	* rewinds a directory stream to the first entry.
	*/
	void rewinddir(DIR* __dir);

	/**
	* [seekdir(3)](http://man7.org/linux/man-pages/man3/seekdir.3.html)
	* seeks a directory stream to the given entry, which must be a value returned
	* by telldir().
	*
	* Available since API level 23.
	*/
	void seekdir(DIR* __dir, long __location) __INTRODUCED_IN(23);

	/**
	* [telldir(3)](http://man7.org/linux/man-pages/man3/telldir.3.html)
	* returns a value representing the current position in the directory
	* for use with seekdir().
	*
	* Returns the current position on success and returns -1 and sets `errno` on failure.
	*
	* Available since API level 23.
	*/
	long telldir(DIR* __dir) __INTRODUCED_IN(23);

	/**
	* [dirfd(3)](http://man7.org/linux/man-pages/man3/dirfd.3.html)
	* returns the file descriptor backing the given directory stream.
	*
	* Returns a file descriptor on success and returns -1 and sets `errno` on failure.
	*/
	int dirfd(DIR* __dir);

	/**
	* [alphasort](http://man7.org/linux/man-pages/man3/alphasort.3.html) is a
	* comparator for use with scandir() that uses strcoll().
	*/
	int alphasort(const struct dirent __lhs, const struct dirent __rhs);

	/**
	* [alphasort64](http://man7.org/linux/man-pages/man3/alphasort.3.html) is a
	* comparator for use with scandir64() that uses strcmp().
	*
	* Available since API level 21.
	*/
	int alphasort64(const struct dirent64 __lhs, const struct dirent64 __rhs) __INTRODUCED_IN(21);

	/**
	* [scandir(3)](http://man7.org/linux/man-pages/man3/scandir.3.html)
	* scans all the directory `__path`, filtering entries with `__filter` and
	* sorting them with qsort() using the given `__comparator`, and storing them
	* into `__name_list`. Passing NULL as the filter accepts all entries.
	*
	* Returns the number of entries returned in the list on success,
	* and returns -1 and sets `errno` on failure.
	*/
	int scandir(const char* __path, struct dirent*** __name_list, int (__filter)(const struct dirent), int (__comparator)(const struct dirent, const struct dirent*));

	/**
	* [scandir64(3)](http://man7.org/linux/man-pages/man3/scandir.3.html)
	* scans all the directory `__path`, filtering entries with `__filter` and
	* sorting them with qsort() using the given `__comparator`, and storing them
	* into `__name_list`. Passing NULL as the filter accepts all entries.
	*
	* Returns the number of entries returned in the list on success,
	* and returns -1 and sets `errno` on failure.
	*
	* Available since API level 21.
	*/
	int scandir64(const char* __path, struct dirent64*** __name_list, int (__filter)(const struct dirent64), int (__comparator)(const struct dirent64, const struct dirent64*)) __INTRODUCED_IN(21);

	#if defined(__USE_GNU)

	/**
	* [scandirat64(3)](http://man7.org/linux/man-pages/man3/scandirat.3.html)
	* scans all the directory referenced by the pair of `__dir_fd` and `__path`,
	* filtering entries with `__filter` and sorting them with qsort() using the
	* given `__comparator`, and storing them into `__name_list`. Passing NULL as
	* the filter accepts all entries.
	*
	* Returns the number of entries returned in the list on success,
	* and returns -1 and sets `errno` on failure.
	*
	* Available since API level 24.
	*/
	int scandirat64(int __dir_fd, const char* __path, struct dirent64*** __name_list, int (__filter)(const struct dirent64), int (__comparator)(const struct dirent64, const struct dirent64*)) __INTRODUCED_IN(24);

	/**
	* [scandirat(3)](http://man7.org/linux/man-pages/man3/scandirat.3.html)
	* scans all the directory referenced by the pair of `__dir_fd` and `__path`,
	* filtering entries with `__filter` and sorting them with qsort() using the
	* given `__comparator`, and storing them into `__name_list`. Passing NULL as
	* the filter accepts all entries.
	*
	* Returns the number of entries returned in the list on success,
	* and returns -1 and sets `errno` on failure.
	*
	* Available since API level 24.
	*/
	int scandirat(int __dir_fd, const char* __path, struct dirent*** __name_list, int (__filter)(const struct dirent), int (__comparator)(const struct dirent, const struct dirent*)) __INTRODUCED_IN(24);

	#endif

	__END_DECLS