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glibc  2.9
isastream.c
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00001 /* Copyright (C) 1998 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <fcntl.h>
00021 #include <stropts.h>
00022 
00023 int
00024 isastream (fildes)
00025      int fildes;
00026 {
00027   /* In general we do not have a STREAMS implementation and therefore
00028      return 0.  But for invalid file descriptors we have to return an
00029      error.  */
00030   if (__fcntl (fildes, F_GETFD) < 0)
00031     return -1;
00032 
00033   /* No STREAM.  */
00034   return 0;
00035 }