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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <stddef.h>
  22 #include <unistd.h>
  23 #include <limits.h>
  24 #include <sys/statfs.h>
  25
  26
  27 /* Get file-specific information about descriptor FD.  */
  28 long int
  29 DEFUN(__fpathconf, (fd, name), int fd AND int name)
  30 {
  31   if (fd < 0)
  32     {
  33       errno = EBADF;
  34       return -1;
  35     }
  36
  37   switch (name)
  38     {
  39     default:
  40       errno = EINVAL;
  41       return -1;
  42
  43     case _PC_LINK_MAX:
  44 #ifdef  LINK_MAX
  45       return LINK_MAX;
  46 #else
  47       errno = ENOSYS;
  48       return -1;
  49 #endif
  50
  51     case _PC_MAX_CANON:
  52 #ifdef  MAX_CANON
  53       return MAX_CANON;
  54 #else
  55       errno = ENOSYS;
  56       return -1;
  57 #endif
  58
  59     case _PC_MAX_INPUT:
  60 #ifdef  MAX_INPUT
  61       return MAX_INPUT;
  62 #else
  63       errno = ENOSYS;
  64       return -1;
  65 #endif
  66
  67     case _PC_NAME_MAX:
  68 #ifdef  NAME_MAX
  69       return NAME_MAX;
  70 #else
  71       errno = ENOSYS;
  72       return -1;
  73 #endif
  74
  75     case _PC_PATH_MAX:
  76 #ifdef  PATH_MAX
  77       {
  78         struct statfs buf;
  79
  80         if (__fstatfs (fd, &buf) < 0)
  81           return errno == ENOSYS ? PATH_MAX : -1;
  82         else
  83           return buf.f_namelen;
  84       }
  85 #else
  86       errno = ENOSYS;
  87       return -1;
  88 #endif
  89
  90     case _PC_PIPE_BUF:
  91 #ifdef  PIPE_BUF
  92       return PIPE_BUF;
  93 #else
  94       errno = ENOSYS;
  95       return -1;
  96 #endif
  97
  98     case _PC_CHOWN_RESTRICTED:
  99 #ifdef  _POSIX_CHOWN_RESTRICTED
 100       return _POSIX_CHOWN_RESTRICTED;
 101 #else
 102       return -1;
 103 #endif
 104
 105     case _PC_NO_TRUNC:
 106 #ifdef  _POSIX_NO_TRUNC
 107       return _POSIX_NO_TRUNC;
 108 #else
 109       return -1;
 110 #endif
 111
 112     case _PC_VDISABLE:
 113 #ifdef  _POSIX_VDISABLE
 114       return _POSIX_VDISABLE;
 115 #else
 116       return -1;
 117 #endif
 118
 119     case _PC_SYNC_IO:
 120 #ifdef  _POSIX_SYNC_IO
 121       return _POSIX_SYNC_IO;
 122 #else
 123       return -1;
 124 #endif
 125
 126     case _PC_ASYNC_IO:
 127 #ifdef  _POSIX_ASYNC_IO
 128       return _POSIX_ASYNC_IO;
 129 #else
 130       return -1;
 131 #endif
 132
 133     case _PC_PRIO_IO:
 134 #ifdef  _POSIX_PRIO_IO
 135       return _POSIX_PRIO_IO;
 136 #else
 137       return -1;
 138 #endif
 139
 140     case _PC_SOCK_MAXBUF:
 141 #ifdef  SOCK_MAXBUF
 142       return SOCK_MAXBUF;
 143 #else
 144       errno = ENOSYS;
 145       return -1;
 146 #endif
 147     }
 148
 149   errno = ENOSYS;
 150   return -1;
 151 }
 152
 153 weak_alias (__fpathconf, fpathconf)