sysdeps/posix/isfdtype.c

   1 /* isfdtype - Determine whether descriptor has given property.
   2 Copyright (C) 1996 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 Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 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 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <sys/stat.h>
  22 #include <sys/socket.h>
  23
  24 int
  25 isfdtype (int fildes, int fdtype)
  26 {
  27   struct stat st;
  28   int result;
  29
  30   {
  31     int save_error = errno;
  32     result = fstat (fildes, &st);
  33     __set_errno (save_error);
  34   }
  35
  36   return result ?: (st.st_mode & S_IFMT) == fdtype;
  37 }