sysdeps/posix/isfdtype.c

   1 /* Determine whether descriptor has given property.
   2    Copyright (C) 1996-2016 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 <errno.h>
  20 #include <sys/stat.h>
  21 #include <sys/socket.h>
  22 #include <sys/types.h>
  23
  24 int
  25 isfdtype (int fildes, int fdtype)
  26 {
  27   struct stat64 st;
  28   int result;
  29
  30   {
  31     int save_error = errno;
  32     result = fstat64 (fildes, &st);
  33     __set_errno (save_error);
  34   }
  35
  36   return result ?: (st.st_mode & S_IFMT) == (mode_t) fdtype;
  37 }