sysdeps/posix/fpathconf.c

   1 /* Copyright (C) 1991, 1995, 1996 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 <sys/statfs.h>
  24
  25
  26 /* Get file-specific information about descriptor FD.  */
  27 long int
  28 __fpathconf (fd, name)
  29      int fd;
  30      int name;
  31 {
  32   if (fd < 0)
  33     {
  34       __set_errno (EBADF);
  35       return -1;
  36     }
  37
  38   switch (name)
  39     {
  40     default:
  41       __set_errno (EINVAL);
  42       return -1;
  43
  44     case _PC_LINK_MAX:
  45 #ifdef  LINK_MAX
  46       return LINK_MAX;
  47 #else
  48       __set_errno (ENOSYS);
  49       return -1;
  50 #endif
  51
  52     case _PC_MAX_CANON:
  53 #ifdef  MAX_CANON
  54       return MAX_CANON;
  55 #else
  56       __set_errno (ENOSYS);
  57       return -1;
  58 #endif
  59
  60     case _PC_MAX_INPUT:
  61 #ifdef  MAX_INPUT
  62       return MAX_INPUT;
  63 #else
  64       __set_errno (ENOSYS);
  65       return -1;
  66 #endif
  67
  68     case _PC_NAME_MAX:
  69 #ifdef  NAME_MAX
  70       {
  71         struct statfs buf;
  72
  73         if (__fstatfs (fd, &buf) < 0)
  74           return errno == ENOSYS ? NAME_MAX : -1;
  75         else
  76           return buf.f_namelen;
  77       }
  78 #else
  79       __set_errno (ENOSYS);
  80       return -1;
  81 #endif
  82
  83     case _PC_PATH_MAX:
  84 #ifdef  PATH_MAX
  85       return PATH_MAX;
  86 #else
  87       __set_errno (ENOSYS);
  88       return -1;
  89 #endif
  90
  91     case _PC_PIPE_BUF:
  92 #ifdef  PIPE_BUF
  93       return PIPE_BUF;
  94 #else
  95       __set_errno (ENOSYS);
  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       __set_errno (ENOSYS);
 146       return -1;
 147 #endif
 148     }
 149
 150   __set_errno (ENOSYS);
 151   return -1;
 152 }
 153
 154 weak_alias (__fpathconf, fpathconf)