io/ftw.h

   1 /* Copyright (C) 1992-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /*
  19  *      X/Open Portability Guide 4.2: ftw.h
  20  */
  21
  22 #ifndef _FTW_H
  23 #define _FTW_H  1
  24
  25 #include <features.h>
  26
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29
  30
  31 __BEGIN_DECLS
  32
  33 /* Values for the FLAG argument to the user function passed to `ftw'
  34    and 'nftw'.  */
  35 enum
  36 {
  37   FTW_F,                /* Regular file.  */
  38 #define FTW_F    FTW_F
  39   FTW_D,                /* Directory.  */
  40 #define FTW_D    FTW_D
  41   FTW_DNR,              /* Unreadable directory.  */
  42 #define FTW_DNR  FTW_DNR
  43   FTW_NS,               /* Unstatable file.  */
  44 #define FTW_NS   FTW_NS
  45
  46 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
  47
  48   FTW_SL,               /* Symbolic link.  */
  49 # define FTW_SL  FTW_SL
  50 #endif
  51
  52 #ifdef __USE_XOPEN_EXTENDED
  53 /* These flags are only passed from the `nftw' function.  */
  54   FTW_DP,               /* Directory, all subdirs have been visited. */
  55 # define FTW_DP  FTW_DP
  56   FTW_SLN               /* Symbolic link naming non-existing file.  */
  57 # define FTW_SLN FTW_SLN
  58
  59 #endif  /* extended X/Open */
  60 };
  61
  62
  63 #ifdef __USE_XOPEN_EXTENDED
  64 /* Flags for fourth argument of `nftw'.  */
  65 enum
  66 {
  67   FTW_PHYS = 1,         /* Perform physical walk, ignore symlinks.  */
  68 # define FTW_PHYS       FTW_PHYS
  69   FTW_MOUNT = 2,        /* Report only files on same file system as the
  70                            argument.  */
  71 # define FTW_MOUNT      FTW_MOUNT
  72   FTW_CHDIR = 4,        /* Change to current directory while processing it.  */
  73 # define FTW_CHDIR      FTW_CHDIR
  74   FTW_DEPTH = 8         /* Report files in directory before directory itself.*/
  75 # define FTW_DEPTH      FTW_DEPTH
  76 # ifdef __USE_GNU
  77   ,
  78   FTW_ACTIONRETVAL = 16 /* Assume callback to return FTW_* values instead of
  79                            zero to continue and non-zero to terminate.  */
  80 #  define FTW_ACTIONRETVAL FTW_ACTIONRETVAL
  81 # endif
  82 };
  83
  84 #ifdef __USE_GNU
  85 /* Return values from callback functions.  */
  86 enum
  87 {
  88   FTW_CONTINUE = 0,     /* Continue with next sibling or for FTW_D with the
  89                            first child.  */
  90 # define FTW_CONTINUE   FTW_CONTINUE
  91   FTW_STOP = 1,         /* Return from `ftw' or `nftw' with FTW_STOP as return
  92                            value.  */
  93 # define FTW_STOP       FTW_STOP
  94   FTW_SKIP_SUBTREE = 2, /* Only meaningful for FTW_D: Don't walk through the
  95                            subtree, instead just continue with its next
  96                            sibling. */
  97 # define FTW_SKIP_SUBTREE FTW_SKIP_SUBTREE
  98   FTW_SKIP_SIBLINGS = 3,/* Continue with FTW_DP callback for current directory
  99                             (if FTW_DEPTH) and then its siblings.  */
 100 # define FTW_SKIP_SIBLINGS FTW_SKIP_SIBLINGS
 101 };
 102 #endif
 103
 104 /* Structure used for fourth argument to callback function for `nftw'.  */
 105 struct FTW
 106   {
 107     int base;
 108     int level;
 109   };
 110 #endif  /* extended X/Open */
 111
 112
 113 /* Convenient types for callback functions.  */
 114 typedef int (*__ftw_func_t) (const char *__filename,
 115                              const struct stat *__status, int __flag);
 116 #ifdef __USE_LARGEFILE64
 117 typedef int (*__ftw64_func_t) (const char *__filename,
 118                                const struct stat64 *__status, int __flag);
 119 #endif
 120 #ifdef __USE_XOPEN_EXTENDED
 121 typedef int (*__nftw_func_t) (const char *__filename,
 122                               const struct stat *__status, int __flag,
 123                               struct FTW *__info);
 124 # ifdef __USE_LARGEFILE64
 125 typedef int (*__nftw64_func_t) (const char *__filename,
 126                                 const struct stat64 *__status,
 127                                 int __flag, struct FTW *__info);
 128 # endif
 129 #endif
 130
 131 /* Call a function on every element in a directory tree.
 132
 133    This function is a possible cancellation point and therefore not
 134    marked with __THROW.  */
 135 #ifndef __USE_FILE_OFFSET64
 136 extern int ftw (const char *__dir, __ftw_func_t __func, int __descriptors)
 137      __nonnull ((1, 2));
 138 #else
 139 # ifdef __REDIRECT
 140 extern int __REDIRECT (ftw, (const char *__dir, __ftw_func_t __func,
 141                              int __descriptors), ftw64) __nonnull ((1, 2));
 142 # else
 143 #  define ftw ftw64
 144 # endif
 145 #endif
 146 #ifdef __USE_LARGEFILE64
 147 extern int ftw64 (const char *__dir, __ftw64_func_t __func,
 148                   int __descriptors) __nonnull ((1, 2));
 149 #endif
 150
 151 #ifdef __USE_XOPEN_EXTENDED
 152 /* Call a function on every element in a directory tree.  FLAG allows
 153    to specify the behaviour more detailed.
 154
 155    This function is a possible cancellation point and therefore not
 156    marked with __THROW.  */
 157 # ifndef __USE_FILE_OFFSET64
 158 extern int nftw (const char *__dir, __nftw_func_t __func, int __descriptors,
 159                  int __flag) __nonnull ((1, 2));
 160 # else
 161 #  ifdef __REDIRECT
 162 extern int __REDIRECT (nftw, (const char *__dir, __nftw_func_t __func,
 163                               int __descriptors, int __flag), nftw64)
 164      __nonnull ((1, 2));
 165 #  else
 166 #   define nftw nftw64
 167 #  endif
 168 # endif
 169 # ifdef __USE_LARGEFILE64
 170 extern int nftw64 (const char *__dir, __nftw64_func_t __func,
 171                    int __descriptors, int __flag) __nonnull ((1, 2));
 172 # endif
 173 #endif
 174
 175 __END_DECLS
 176
 177 #endif  /* ftw.h */