sysdeps/unix/sysv/linux/pathconf.c

   1 /* Get file-specific information about a file.  Linux version.
   2    Copyright (C) 1991,1995,1996,1998-2002,2003 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <unistd.h>
  21 #include <errno.h>
  22 #include "pathconf.h"
  23 #include "linux_fsinfo.h"
  24
  25 static long int posix_pathconf (const char *file, int name);
  26
  27 /* Define this first, so it can be inlined.  */
  28 #define __pathconf static posix_pathconf
  29 #include <sysdeps/posix/pathconf.c>
  30
  31
  32 /* Get file-specific information about FILE.  */
  33 long int
  34 __pathconf (const char *file, int name)
  35 {
  36   struct statfs fsbuf;
  37
  38   switch (name)
  39     {
  40     case _PC_LINK_MAX:
  41       return __statfs_link_max (__statfs (file, &fsbuf), &fsbuf);
  42
  43     case _PC_FILESIZEBITS:
  44       return __statfs_filesize_max (__statfs (file, &fsbuf), &fsbuf);
  45
  46     case _PC_2_SYMLINKS:
  47       return __statfs_symlinks (__statfs (file, &fsbuf), &fsbuf);
  48
  49     default:
  50       return posix_pathconf (file, name);
  51     }
  52 }
  53
  54
  55 /* Used like: return statfs_link_max (__statfs (name, &buf), &buf); */
  56 long int
  57 __statfs_link_max (int result, const struct statfs *fsbuf)
  58 {
  59   if (result < 0)
  60     {
  61       if (errno == ENOSYS)
  62         /* Not possible, return the default value.  */
  63         return LINUX_LINK_MAX;
  64
  65       /* Some error occured.  */
  66       return -1;
  67     }
  68
  69   switch (fsbuf->f_type)
  70     {
  71     case EXT2_SUPER_MAGIC:
  72       return EXT2_LINK_MAX;
  73
  74     case MINIX_SUPER_MAGIC:
  75     case MINIX_SUPER_MAGIC2:
  76       return MINIX_LINK_MAX;
  77
  78     case MINIX2_SUPER_MAGIC:
  79     case MINIX2_SUPER_MAGIC2:
  80       return MINIX2_LINK_MAX;
  81
  82     case XENIX_SUPER_MAGIC:
  83       return XENIX_LINK_MAX;
  84
  85     case SYSV4_SUPER_MAGIC:
  86     case SYSV2_SUPER_MAGIC:
  87       return SYSV_LINK_MAX;
  88
  89     case COH_SUPER_MAGIC:
  90       return COH_LINK_MAX;
  91
  92     case UFS_MAGIC:
  93     case UFS_CIGAM:
  94       return UFS_LINK_MAX;
  95
  96     case REISERFS_SUPER_MAGIC:
  97       return REISERFS_LINK_MAX;
  98
  99     case XFS_SUPER_MAGIC:
 100       return XFS_LINK_MAX;
 101
 102     default:
 103       return LINUX_LINK_MAX;
 104     }
 105 }
 106
 107
 108 /* Used like: return statfs_filesize_max (__statfs (name, &buf), &buf); */
 109 long int
 110 __statfs_filesize_max (int result, const struct statfs *fsbuf)
 111 {
 112   if (result < 0)
 113     {
 114       if (errno == ENOSYS)
 115         /* Not possible, return the default value.  */
 116         return 32;
 117
 118       /* Some error occured.  */
 119       return -1;
 120     }
 121
 122   switch (fsbuf->f_type)
 123     {
 124     case EXT2_SUPER_MAGIC:
 125     case UFS_MAGIC:
 126     case UFS_CIGAM:
 127     case REISERFS_SUPER_MAGIC:
 128     case XFS_SUPER_MAGIC:
 129     case SMB_SUPER_MAGIC:
 130     case NTFS_SUPER_MAGIC:
 131     case UDF_SUPER_MAGIC:
 132     case JFS_SUPER_MAGIC:
 133     case VXFS_SUPER_MAGIC:
 134       return 64;
 135
 136     case MSDOS_SUPER_MAGIC:
 137     case JFFS_SUPER_MAGIC:
 138     case JFFS2_SUPER_MAGIC:
 139     case NCP_SUPER_MAGIC:
 140     case ROMFS_SUPER_MAGIC:
 141       return 32;
 142
 143     default:
 144       return 32;
 145     }
 146 }
 147
 148
 149 /* Used like: return statfs_link_max (__statfs (name, &buf), &buf); */
 150 long int
 151 __statfs_symlinks (int result, const struct statfs *fsbuf)
 152 {
 153   if (result < 0)
 154     {
 155       if (errno == ENOSYS)
 156         /* Not possible, return the default value.  */
 157         return 1;
 158
 159       /* Some error occured.  */
 160       return -1;
 161     }
 162
 163   switch (fsbuf->f_type)
 164     {
 165     case ADFS_SUPER_MAGIC:
 166     case BFS_MAGIC:
 167     case CRAMFS_MAGIC:
 168     case DEVPTS_SUPER_MAGIC:
 169     case EFS_SUPER_MAGIC:
 170     case EFS_MAGIC:
 171     case MSDOS_SUPER_MAGIC:
 172     case NTFS_SUPER_MAGIC:
 173     case QNX4_SUPER_MAGIC:
 174     case ROMFS_SUPER_MAGIC:
 175       /* No symlink support.  */
 176       return 0;
 177
 178     default:
 179       return 1;
 180     }
 181 }