sysdeps/unix/sysv/linux/pathconf.c

   1 /* Linux specific extensions to pathconf.
   2    Copyright (C) 1991, 95, 96, 98, 99, 2000 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
  27 /* The Linux kernel header mentioned this as a kind of generic value.  */
  28 #define LINUX_LINK_MAX  127
  29
  30 static long int posix_pathconf (const char *path, int name);
  31
  32
  33 /* Get file-specific information about descriptor FD.  */
  34 long int
  35 __pathconf (path, name)
  36      const char *path;
  37      int name;
  38 {
  39   if (name == _PC_LINK_MAX)
  40     {
  41       struct statfs fsbuf;
  42
  43       /* Determine the filesystem type.  */
  44       if (__statfs (path, &fsbuf) < 0)
  45         /* not possible, return the default value.  */
  46         return LINK_MAX;
  47
  48       switch (fsbuf.f_type)
  49         {
  50         case EXT2_SUPER_MAGIC:
  51           return EXT2_LINK_MAX;
  52
  53         case MINIX_SUPER_MAGIC:
  54         case MINIX_SUPER_MAGIC2:
  55           return MINIX_LINK_MAX;
  56
  57         case MINIX2_SUPER_MAGIC:
  58         case MINIX2_SUPER_MAGIC2:
  59           return MINIX2_LINK_MAX;
  60
  61         case XENIX_SUPER_MAGIC:
  62           return XENIX_LINK_MAX;
  63
  64         case SYSV4_SUPER_MAGIC:
  65         case SYSV2_SUPER_MAGIC:
  66           return SYSV_LINK_MAX;
  67
  68         case COH_SUPER_MAGIC:
  69           return COH_LINK_MAX;
  70
  71         case UFS_MAGIC:
  72         case UFS_CIGAM:
  73           return UFS_LINK_MAX;
  74
  75         case REISERFS_SUPER_MAGIC:
  76           return REISERFS_LINK_MAX;
  77
  78         default:
  79           return LINUX_LINK_MAX;
  80         }
  81     }
  82
  83   return posix_pathconf (path, name);
  84 }
  85
  86 #define __pathconf static posix_pathconf
  87 #include <sysdeps/posix/pathconf.c>