sysdeps/unix/sysv/linux/fpathconf.c

   1 /* Get file-specific information about descriptor FD.  Linux version.
   2    Copyright (C) 1991-2013 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <fcntl.h>
  20 #include "pathconf.h"
  21
  22 static long int posix_fpathconf (int fd, int name);
  23
  24 /* Define this first, so it can be inlined.  */
  25 #define __fpathconf static posix_fpathconf
  26 #include <sysdeps/posix/fpathconf.c>
  27
  28
  29 /* Get file-specific information about descriptor FD.  */
  30 long int
  31 __fpathconf (fd, name)
  32      int fd;
  33      int name;
  34 {
  35   struct statfs fsbuf;
  36   int r;
  37
  38   switch (name)
  39     {
  40     case _PC_LINK_MAX:
  41       return __statfs_link_max (__fstatfs (fd, &fsbuf), &fsbuf, NULL, fd);
  42
  43     case _PC_FILESIZEBITS:
  44       return __statfs_filesize_max (__fstatfs (fd, &fsbuf), &fsbuf);
  45
  46     case _PC_2_SYMLINKS:
  47       return __statfs_symlinks (__fstatfs (fd, &fsbuf), &fsbuf);
  48
  49     case _PC_CHOWN_RESTRICTED:
  50       return __statfs_chown_restricted (__fstatfs (fd, &fsbuf), &fsbuf);
  51
  52     case _PC_PIPE_BUF:
  53       r = __fcntl (fd, F_GETPIPE_SZ);
  54       if (r > 0)
  55         return r;
  56       /* FALLTHROUGH */
  57
  58     default:
  59       return posix_fpathconf (fd, name);
  60     }
  61 }