sysdeps/posix/fpathconf.c

   1 /* Copyright (C) 1991, 1995, 1996, 1998 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <stddef.h>
  21 #include <unistd.h>
  22 #include <limits.h>
  23 #include <sys/statfs.h>
  24
  25
  26 /* Get file-specific information about descriptor FD.  */
  27 long int
  28 __fpathconf (fd, name)
  29      int fd;
  30      int name;
  31 {
  32   if (fd < 0)
  33     {
  34       __set_errno (EBADF);
  35       return -1;
  36     }
  37
  38   switch (name)
  39     {
  40     default:
  41       __set_errno (EINVAL);
  42       return -1;
  43
  44     case _PC_LINK_MAX:
  45 #ifdef  LINK_MAX
  46       return LINK_MAX;
  47 #else
  48       return -1;
  49 #endif
  50
  51     case _PC_MAX_CANON:
  52 #ifdef  MAX_CANON
  53       return MAX_CANON;
  54 #else
  55       return -1;
  56 #endif
  57
  58     case _PC_MAX_INPUT:
  59 #ifdef  MAX_INPUT
  60       return MAX_INPUT;
  61 #else
  62       return -1;
  63 #endif
  64
  65     case _PC_NAME_MAX:
  66 #ifdef  NAME_MAX
  67       {
  68         struct statfs buf;
  69         int save_errno = errno;
  70
  71         if (__fstatfs (fd, &buf) < 0)
  72           {
  73             if (errno == ENOSYS)
  74               {
  75                 __set_errno (save_errno);
  76                 return NAME_MAX;
  77               }
  78             else if (errno == ENODEV)
  79               __set_errno (EINVAL);
  80
  81             return -1;
  82           }
  83         else
  84           return buf.f_namelen;
  85       }
  86 #else
  87       return -1;
  88 #endif
  89
  90     case _PC_PATH_MAX:
  91 #ifdef  PATH_MAX
  92       return PATH_MAX;
  93 #else
  94       return -1;
  95 #endif
  96
  97     case _PC_PIPE_BUF:
  98 #ifdef  PIPE_BUF
  99       return PIPE_BUF;
 100 #else
 101       return -1;
 102 #endif
 103
 104     case _PC_CHOWN_RESTRICTED:
 105 #ifdef  _POSIX_CHOWN_RESTRICTED
 106       return _POSIX_CHOWN_RESTRICTED;
 107 #else
 108       return -1;
 109 #endif
 110
 111     case _PC_NO_TRUNC:
 112 #ifdef  _POSIX_NO_TRUNC
 113       return _POSIX_NO_TRUNC;
 114 #else
 115       return -1;
 116 #endif
 117
 118     case _PC_VDISABLE:
 119 #ifdef  _POSIX_VDISABLE
 120       return _POSIX_VDISABLE;
 121 #else
 122       return -1;
 123 #endif
 124
 125     case _PC_SYNC_IO:
 126 #ifdef  _POSIX_SYNC_IO
 127       return _POSIX_SYNC_IO;
 128 #else
 129       return -1;
 130 #endif
 131
 132     case _PC_ASYNC_IO:
 133 #ifdef  _POSIX_ASYNC_IO
 134       return _POSIX_ASYNC_IO;
 135 #else
 136       return -1;
 137 #endif
 138
 139     case _PC_PRIO_IO:
 140 #ifdef  _POSIX_PRIO_IO
 141       return _POSIX_PRIO_IO;
 142 #else
 143       return -1;
 144 #endif
 145
 146     case _PC_SOCK_MAXBUF:
 147 #ifdef  SOCK_MAXBUF
 148       return SOCK_MAXBUF;
 149 #else
 150       return -1;
 151 #endif
 152
 153     case _PC_FILESIZEBITS:
 154 #ifdef FILESIZEBITS
 155       return FILESIZEBITS;
 156 #else
 157       /* We let platforms with larger file sizes overwrite this value.  */
 158       return 32;
 159 #endif
 160     }
 161 }
 162
 163 #undef __fpathconf
 164 weak_alias (__fpathconf, fpathconf)