sysdeps/posix/pathconf.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 <fcntl.h>
  24 #include <sys/statfs.h>
  25
  26 /* Get file-specific information about PATH.  */
  27 long int
  28 __pathconf (const char *path, int name)
  29 {
  30   if (path[0] == '\0')
  31     {
  32       __set_errno (ENOENT);
  33       return -1;
  34     }
  35
  36   switch (name)
  37     {
  38     default:
  39       __set_errno (EINVAL);
  40       return -1;
  41
  42     case _PC_LINK_MAX:
  43 #ifdef  LINK_MAX
  44       return LINK_MAX;
  45 #else
  46       return -1;
  47 #endif
  48
  49     case _PC_MAX_CANON:
  50 #ifdef  MAX_CANON
  51       return MAX_CANON;
  52 #else
  53       return -1;
  54 #endif
  55
  56     case _PC_MAX_INPUT:
  57 #ifdef  MAX_INPUT
  58       return MAX_INPUT;
  59 #else
  60       return -1;
  61 #endif
  62
  63     case _PC_NAME_MAX:
  64 #ifdef  NAME_MAX
  65       {
  66         struct statfs buf;
  67         int save_errno = errno;
  68
  69         if (__statfs (path, &buf) < 0)
  70           {
  71             if (errno == ENOSYS)
  72               {
  73                 errno = save_errno;
  74                 return NAME_MAX;
  75               }
  76             return -1;
  77           }
  78         else
  79           return buf.f_namelen;
  80       }
  81 #else
  82       return -1;
  83 #endif
  84
  85     case _PC_PATH_MAX:
  86 #ifdef  PATH_MAX
  87       return PATH_MAX;
  88 #else
  89       return -1;
  90 #endif
  91
  92     case _PC_PIPE_BUF:
  93 #ifdef  PIPE_BUF
  94       return PIPE_BUF;
  95 #else
  96       return -1;
  97 #endif
  98
  99     case _PC_CHOWN_RESTRICTED:
 100 #ifdef  _POSIX_CHOWN_RESTRICTED
 101       return _POSIX_CHOWN_RESTRICTED;
 102 #else
 103       return -1;
 104 #endif
 105
 106     case _PC_NO_TRUNC:
 107 #ifdef  _POSIX_NO_TRUNC
 108       return _POSIX_NO_TRUNC;
 109 #else
 110       return -1;
 111 #endif
 112
 113     case _PC_VDISABLE:
 114 #ifdef  _POSIX_VDISABLE
 115       return _POSIX_VDISABLE;
 116 #else
 117       return -1;
 118 #endif
 119
 120     case _PC_SYNC_IO:
 121 #ifdef  _POSIX_SYNC_IO
 122       return _POSIX_SYNC_IO;
 123 #else
 124       return -1;
 125 #endif
 126
 127     case _PC_ASYNC_IO:
 128 #ifdef  _POSIX_ASYNC_IO
 129       return _POSIX_ASYNC_IO;
 130 #else
 131       return -1;
 132 #endif
 133
 134     case _PC_PRIO_IO:
 135 #ifdef  _POSIX_PRIO_IO
 136       return _POSIX_PRIO_IO;
 137 #else
 138       return -1;
 139 #endif
 140
 141     case _PC_SOCK_MAXBUF:
 142 #ifdef  SOCK_MAXBUF
 143       return SOCK_MAXBUF;
 144 #else
 145       return -1;
 146 #endif
 147
 148     case _PC_FILESIZEBITS:
 149 #ifdef FILESIZEBITS
 150       return FILESIZEBITS;
 151 #else
 152       /* We let platforms with larger file sizes overwrite this value.  */
 153       return 32;
 154 #endif
 155     }
 156 }
 157
 158 #undef __pathconf
 159 weak_alias (__pathconf, pathconf)