io/ftw.h

   1 /* Copyright (C) 1992,1996-1999,2003,2004 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 /*
  20  *      X/Open Portability Guide 4.2: ftw.h
  21  */
  22
  23 #ifndef _FTW_H
  24 #define _FTW_H  1
  25
  26 #include <features.h>
  27
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30
  31
  32 __BEGIN_DECLS
  33
  34 /* Values for the FLAG argument to the user function passed to `ftw'
  35    and 'nftw'.  */
  36 enum
  37 {
  38   FTW_F,                /* Regular file.  */
  39 #define FTW_F    FTW_F
  40   FTW_D,                /* Directory.  */
  41 #define FTW_D    FTW_D
  42   FTW_DNR,              /* Unreadable directory.  */
  43 #define FTW_DNR  FTW_DNR
  44   FTW_NS,               /* Unstatable file.  */
  45 #define FTW_NS   FTW_NS
  46
  47 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  48
  49   FTW_SL,               /* Symbolic link.  */
  50 # define FTW_SL  FTW_SL
  51 #endif
  52
  53 #ifdef __USE_XOPEN_EXTENDED
  54 /* These flags are only passed from the `nftw' function.  */
  55   FTW_DP,               /* Directory, all subdirs have been visited. */
  56 # define FTW_DP  FTW_DP
  57   FTW_SLN               /* Symbolic link naming non-existing file.  */
  58 # define FTW_SLN FTW_SLN
  59
  60 #endif  /* extended X/Open */
  61 };
  62
  63
  64 #ifdef __USE_XOPEN_EXTENDED
  65 /* Flags for fourth argument of `nftw'.  */
  66 enum
  67 {
  68   FTW_PHYS = 1,         /* Perform physical walk, ignore symlinks.  */
  69 # define FTW_PHYS       FTW_PHYS
  70   FTW_MOUNT = 2,        /* Report only files on same file system as the
  71                            argument.  */
  72 # define FTW_MOUNT      FTW_MOUNT
  73   FTW_CHDIR = 4,        /* Change to current directory while processing it.  */
  74 # define FTW_CHDIR      FTW_CHDIR
  75   FTW_DEPTH = 8         /* Report files in directory before directory itself.*/
  76 # define FTW_DEPTH      FTW_DEPTH
  77 # ifdef __USE_GNU
  78   ,
  79   FTW_ACTIONRETVAL = 16 /* Assume callback to return FTW_* values instead of
  80                            zero to continue and non-zero to terminate.  */
  81 #  define FTW_ACTIONRETVAL FTW_ACTIONRETVAL
  82 # endif
  83 };
  84
  85 #ifdef __USE_GNU
  86 /* Return values from callback functions.  */
  87 enum
  88 {
  89   FTW_CONTINUE = 0,     /* Continue with next sibling or for FTW_D with the
  90                            first child.  */
  91 # define FTW_CONTINUE   FTW_CONTINUE
  92   FTW_STOP = 1,         /* Return from `ftw' or `nftw' with FTW_STOP as return
  93                            value.  */
  94 # define FTW_STOP       FTW_STOP
  95   FTW_SKIP_SUBTREE = 2, /* Only meaningful for FTW_D: Don't walk through the
  96                            subtree, instead just continue with its next
  97                            sibling. */
  98 # define FTW_SKIP_SUBTREE FTW_SKIP_SUBTREE
  99   FTW_SKIP_SIBLINGS = 3,/* Continue with FTW_DP callback for current directory
 100                             (if FTW_DEPTH) and then its siblings.  */
 101 # define FTW_SKIP_SIBLINGS FTW_SKIP_SIBLINGS
 102 };
 103 #endif
 104
 105 /* Structure used for fourth argument to callback function for `nftw'.  */
 106 struct FTW
 107   {
 108     int base;
 109     int level;
 110   };
 111 #endif  /* extended X/Open */
 112
 113
 114 /* Convenient types for callback functions.  */
 115 typedef int (*__ftw_func_t) (__const char *__filename,
 116                              __const struct stat *__status, int __flag);
 117 #ifdef __USE_LARGEFILE64
 118 typedef int (*__ftw64_func_t) (__const char *__filename,
 119                                __const struct stat64 *__status, int __flag);
 120 #endif
 121 #ifdef __USE_XOPEN_EXTENDED
 122 typedef int (*__nftw_func_t) (__const char *__filename,
 123                               __const struct stat *__status, int __flag,
 124                               struct FTW *__info);
 125 # ifdef __USE_LARGEFILE64
 126 typedef int (*__nftw64_func_t) (__const char *__filename,
 127                                 __const struct stat64 *__status,
 128                                 int __flag, struct FTW *__info);
 129 # endif
 130 #endif
 131
 132 /* Call a function on every element in a directory tree.
 133
 134    This function is a possible cancellation point and therefore not
 135    marked with __THROW.  */
 136 #ifndef __USE_FILE_OFFSET64
 137 extern int ftw (__const char *__dir, __ftw_func_t __func, int __descriptors)
 138      __nonnull ((1, 2));
 139 #else
 140 # ifdef __REDIRECT
 141 extern int __REDIRECT (ftw, (__const char *__dir, __ftw_func_t __func,
 142                              int __descriptors), ftw64) __nonnull ((1, 2));
 143 # else
 144 #  define ftw ftw64
 145 # endif
 146 #endif
 147 #ifdef __USE_LARGEFILE64
 148 extern int ftw64 (__const char *__dir, __ftw64_func_t __func,
 149                   int __descriptors) __nonnull ((1, 2));
 150 #endif
 151
 152 #ifdef __USE_XOPEN_EXTENDED
 153 /* Call a function on every element in a directory tree.  FLAG allows
 154    to specify the behaviour more detailed.
 155
 156    This function is a possible cancellation point and therefore not
 157    marked with __THROW.  */
 158 # ifndef __USE_FILE_OFFSET64
 159 extern int nftw (__const char *__dir, __nftw_func_t __func, int __descriptors,
 160                  int __flag) __nonnull ((1, 2));
 161 # else
 162 #  ifdef __REDIRECT
 163 extern int __REDIRECT (nftw, (__const char *__dir, __nftw_func_t __func,
 164                               int __descriptors, int __flag), nftw64)
 165      __nonnull ((1, 2));
 166 #  else
 167 #   define nftw nftw64
 168 #  endif
 169 # endif
 170 # ifdef __USE_LARGEFILE64
 171 extern int nftw64 (__const char *__dir, __nftw64_func_t __func,
 172                    int __descriptors, int __flag) __nonnull ((1, 2));
 173 # endif
 174 #endif
 175
 176 __END_DECLS
 177
 178 #endif  /* ftw.h */