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-rw-r--r--streams/isastream.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/streams/isastream.c b/streams/isastream.c
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+++ b/streams/isastream.c
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+/* Copyright (C) 1998 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stropts.h>
+
+int
+isastream (fildes)
+ int fildes;
+{
+ /* In general we do not have a STREAMS implementation and therefore
+ return 0. But for invalid file descriptors we have to return an
+ error. */
+ if (__fcntl (fildes, F_GETFD) < 0)
+ return -1;
+
+ /* No STREAM. */
+ return 0;
+}