sysdeps/unix/sysv/linux/pathconf.c

   1 /* Linux specific extensions to pathconf.
   2    Copyright (C) 1991, 1995, 1996, 1998 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <unistd.h>
  21 #include <limits.h>
  22 #include <sys/statfs.h>
  23
  24 #include "linux_fsinfo.h"
  25
  26 static long int posix_pathconf (const char *path, int name);
  27
  28
  29 /* Get file-specific information about descriptor FD.  */
  30 long int
  31 __pathconf (path, name)
  32      const char *path;
  33      int name;
  34 {
  35   if (name == _PC_LINK_MAX)
  36     {
  37       struct statfs fsbuf;
  38
  39       /* Determine the filesystem type.  */
  40       if (__statfs (path, &fsbuf) < 0)
  41         /* not possible, return the default value.  */
  42         return LINK_MAX;
  43
  44       switch (fsbuf.f_type)
  45         {
  46         case EXT2_SUPER_MAGIC:
  47           return EXT2_LINK_MAX;
  48
  49         case MINIX_SUPER_MAGIC:
  50         case MINIX_SUPER_MAGIC2:
  51           return MINIX_LINK_MAX;
  52
  53         case MINIX2_SUPER_MAGIC:
  54         case MINIX2_SUPER_MAGIC2:
  55           return MINIX2_LINK_MAX;
  56
  57         case XENIX_SUPER_MAGIC:
  58           return XENIX_LINK_MAX;
  59
  60         case SYSV4_SUPER_MAGIC:
  61         case SYSV2_SUPER_MAGIC:
  62           return SYSV_LINK_MAX;
  63
  64         case COH_SUPER_MAGIC:
  65           return COH_LINK_MAX;
  66
  67         case UFS_MAGIC:
  68         case UFS_CIGAM:
  69           return UFS_LINK_MAX;
  70
  71         default:
  72           return LINK_MAX;
  73         }
  74     }
  75
  76   return posix_pathconf (path, name);
  77 }
  78
  79 #define __pathconf static posix_pathconf
  80 #include <sysdeps/posix/pathconf.c>