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-rw-r--r--stdio-common/errnobug.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/stdio-common/errnobug.c b/stdio-common/errnobug.c
new file mode 100644
index 0000000000..cf17be30a2
--- /dev/null
+++ b/stdio-common/errnobug.c
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+/* Regression test for reported old bug that errno is clobbered
+ by the first successful output to a stream on an unseekable object.
+Copyright (C) 1995 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int
+main (void)
+{
+ int fd[2];
+ FILE *f;
+
+ /* Get a stream that cannot seek. */
+
+ if (pipe (fd))
+ {
+ perror ("pipe");
+ return 1;
+ }
+ f = fdopen (fd[1], "w");
+ if (f == NULL)
+ {
+ perror ("fdopen");
+ return 1;
+ }
+
+ errno = 0;
+ if (fputs ("fnord", f))
+ {
+ perror ("fputs");
+ return 1;
+ }
+
+ if (errno)
+ {
+ perror ("errno gratuitously set -- TEST FAILED");
+ return 1;
+ }
+
+ puts ("Test succeeded.");
+ return 0;
+}