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/* Copyright (C) 1992-2018 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/>.  */

/*
 *	X/Open Portability Guide 4.2: ftw.h
 */

#ifndef _FTW_H
#define	_FTW_H	1

#include <features.h>

#include <sys/types.h>
#include <sys/stat.h>

__BEGIN_DECLS

/* Values for the FLAG argument to the user function passed to `ftw'
   and 'nftw'.  */
enum
{
  FTW_F,		/* Regular file.  */
#define FTW_F	 FTW_F
  FTW_D,		/* Directory.  */
#define FTW_D	 FTW_D
  FTW_DNR,		/* Unreadable directory.  */
#define FTW_DNR	 FTW_DNR
  FTW_NS,		/* Unstatable file.  */
#define FTW_NS	 FTW_NS

#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED

FTW_SL,		/* Symbolic link.  */
# define FTW_SL	 FTW_SL
#endif

#ifdef __USE_XOPEN_EXTENDED
/* These flags are only passed from the `nftw' function.  */
  FTW_DP,		/* Directory, all subdirs have been visited. */
# define FTW_DP	 FTW_DP
  FTW_SLN		/* Symbolic link naming non-existing file.  */
# define FTW_SLN FTW_SLN

#endif	/* extended X/Open */
};

#ifdef __USE_XOPEN_EXTENDED
/* Flags for fourth argument of `nftw'.  */
enum
{
  FTW_PHYS = 1,		/* Perform physical walk, ignore symlinks.  */
# define FTW_PHYS	FTW_PHYS
  FTW_MOUNT = 2,	/* Report only files on same file system as the
			   argument.  */
# define FTW_MOUNT	FTW_MOUNT
  FTW_CHDIR = 4,	/* Change to current directory while processing it.  */
# define FTW_CHDIR	FTW_CHDIR
  FTW_DEPTH = 8		/* Report files in directory before directory itself.*/
# define FTW_DEPTH	FTW_DEPTH
# ifdef __USE_GNU
  ,
  FTW_ACTIONRETVAL = 16	/* Assume callback to return FTW_* values instead of
			   zero to continue and non-zero to terminate.  */
#  define FTW_ACTIONRETVAL FTW_ACTIONRETVAL
# endif
};

#ifdef __USE_GNU
/* Return values from callback functions.  */
enum
{
  FTW_CONTINUE = 0,	/* Continue with next sibling or for FTW_D with the
			   first child.  */
# define FTW_CONTINUE	FTW_CONTINUE
  FTW_STOP = 1,		/* Return from `ftw' or `nftw' with FTW_STOP as return
			   value.  */
# define FTW_STOP	FTW_STOP
  FTW_SKIP_SUBTREE = 2,	/* Only meaningful for FTW_D: Don't walk through the
			   subtree, instead just continue with its next
			   sibling. */
# define FTW_SKIP_SUBTREE FTW_SKIP_SUBTREE
  FTW_SKIP_SIBLINGS = 3,/* Continue with FTW_DP callback for current directory
			    (if FTW_DEPTH) and then its siblings.  */
# define FTW_SKIP_SIBLINGS FTW_SKIP_SIBLINGS
};
#endif

/* Structure used for fourth argument to callback function for `nftw'.  */
struct FTW
  {
    int base;
    int level;
  };
#endif	/* extended X/Open */

/* Convenient types for callback functions.  */
typedef int (*__ftw_func_t) (const char *__filename,
			     const struct stat *__status, int __flag);
#ifdef __USE_LARGEFILE64
typedef int (*__ftw64_func_t) (const char *__filename,
			       const struct stat64 *__status, int __flag);
#endif
#ifdef __USE_XOPEN_EXTENDED
typedef int (*__nftw_func_t) (const char *__filename,
			      const struct stat *__status, int __flag,
			      struct FTW *__info);
# ifdef __USE_LARGEFILE64
typedef int (*__nftw64_func_t) (const char *__filename,
				const struct stat64 *__status,
				int __flag, struct FTW *__info);
# endif
#endif

/* Call a function on every element in a directory tree.

This function is a possible cancellation point and therefore not
   marked with __THROW.  */
#ifndef __USE_FILE_OFFSET64
extern int ftw (const char *__dir, __ftw_func_t __func, int __descriptors)
     __nonnull ((1, 2));
#else
# ifdef __REDIRECT
extern int __REDIRECT (ftw, (const char *__dir, __ftw_func_t __func,
			     int __descriptors), ftw64) __nonnull ((1, 2));
# else
#  define ftw ftw64
# endif
#endif
#ifdef __USE_LARGEFILE64
extern int ftw64 (const char *__dir, __ftw64_func_t __func,
		  int __descriptors) __nonnull ((1, 2));
#endif

#ifdef __USE_XOPEN_EXTENDED
/* Call a function on every element in a directory tree.  FLAG allows
   to specify the behaviour more detailed.

This function is a possible cancellation point and therefore not
   marked with __THROW.  */
# ifndef __USE_FILE_OFFSET64
extern int nftw (const char *__dir, __nftw_func_t __func, int __descriptors,
		 int __flag) __nonnull ((1, 2));
# else
#  ifdef __REDIRECT
extern int __REDIRECT (nftw, (const char *__dir, __nftw_func_t __func,
			      int __descriptors, int __flag), nftw64)
     __nonnull ((1, 2));
#  else
#   define nftw nftw64
#  endif
# endif
# ifdef __USE_LARGEFILE64
extern int nftw64 (const char *__dir, __nftw64_func_t __func,
		   int __descriptors, int __flag) __nonnull ((1, 2));
# endif
#endif

__END_DECLS

#endif	/* ftw.h */

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✏️ ftw.h