/* Verify that print functions return error when there is an I/O error.
- Copyright (C) 2005-2012 Free Software Foundation, Inc.
+ Copyright (C) 2005-2016 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
FILE *fp = fdopen (fd, "w");
if (fp == NULL)
error (EXIT_FAILURE, errno, "fdopen");
+
+ /* All of the tests below verify that flushing buffers result in failure of
+ the fprintf calls. We ensure that the buffer is flushed at the end of
+ each fprintf call by doing two things - setting the file pointer to
+ line-buffered so that it is flushed whenever it encounters a newline and
+ then ensuring that there is a newline in each of the format strings we
+ pass to fprintf. */
+
setlinebuf (fp);
close (fd);
unlink (tmpl);
+
int n = fprintf (fp, "hello world\n");
printf ("fprintf = %d\n", n);
if (n >= 0)
error (EXIT_FAILURE, 0, "first fprintf succeeded");
+
n = fprintf (fp, "hello world\n");
printf ("fprintf = %d\n", n);
if (n >= 0)
error (EXIT_FAILURE, 0, "second fprintf succeeded");
/* Padded printing takes a different code path. */
- n = fprintf (fp, "%10000000s", "foo");
+ n = fprintf (fp, "%100s\n", "foo");
printf ("fprintf = %d\n", n);
if (n >= 0)
error (EXIT_FAILURE, 0, "padded fprintf succeeded");