sysdeps/unix/sysv/linux/fpathconf.c

   1 /* Get file-specific information about descriptor FD.  Linux version.
   2    Copyright (C) 1991,1995,1996,1998-2003,2008,2010,2011
   3    Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <fcntl.h>
  21 #include "pathconf.h"
  22
  23 static long int posix_fpathconf (int fd, int name);
  24
  25 /* Define this first, so it can be inlined.  */
  26 #define __fpathconf static posix_fpathconf
  27 #include <sysdeps/posix/fpathconf.c>
  28
  29
  30 /* Get file-specific information about descriptor FD.  */
  31 long int
  32 __fpathconf (fd, name)
  33      int fd;
  34      int name;
  35 {
  36   struct statfs fsbuf;
  37   int r;
  38
  39   switch (name)
  40     {
  41     case _PC_LINK_MAX:
  42       return __statfs_link_max (__fstatfs (fd, &fsbuf), &fsbuf, NULL, fd);
  43
  44     case _PC_FILESIZEBITS:
  45       return __statfs_filesize_max (__fstatfs (fd, &fsbuf), &fsbuf);
  46
  47     case _PC_2_SYMLINKS:
  48       return __statfs_symlinks (__fstatfs (fd, &fsbuf), &fsbuf);
  49
  50     case _PC_CHOWN_RESTRICTED:
  51       return __statfs_chown_restricted (__fstatfs (fd, &fsbuf), &fsbuf);
  52
  53     case _PC_PIPE_BUF:
  54       r = __fcntl (fd, F_GETPIPE_SZ);
  55       if (r > 0)
  56         return r;
  57       /* FALLTHROUGH */
  58
  59     default:
  60       return posix_fpathconf (fd, name);
  61     }
  62 }