/* Test of POSIX compatible fflush() function.
- Copyright (C) 2007, 2009, 2010 Free Software Foundation, Inc.
+ Copyright (C) 2007, 2009-2013 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include <config.h>
+/* None of the files accessed by this test are large, so disable the
+ ftell link warning if we are not using the gnulib ftell module. */
+#define _GL_NO_LARGE_FILES
#include <stdio.h>
#include "signature.h"
SIGNATURE_CHECK (fflush, int, (FILE *));
+#include <errno.h>
#include <unistd.h>
+#include "macros.h"
+
int
main (void)
{
/* Test fflush. */
f = fopen ("test-fflush.txt", "r");
+ ASSERT (f != NULL);
fd = fileno (f);
if (!f || 0 > fd || fread (buffer, 1, 5, f) != 5)
{
fputs ("Failed initial read of sample file.\n", stderr);
- fclose (f);
+ if (f)
+ fclose (f);
unlink ("test-fflush.txt");
return 1;
}
return 1;
}
fclose (f);
+
+ /* Test that fflush() sets errno if someone else closes the stream
+ fd behind the back of stdio. */
+ {
+ FILE *fp = fopen ("test-fflush.txt", "w");
+ ASSERT (fp != NULL);
+ fputc ('x', fp);
+ ASSERT (close (fileno (fp)) == 0);
+ errno = 0;
+ ASSERT (fflush (fp) == EOF);
+ ASSERT (errno == EBADF);
+ fclose (fp);
+ }
+
+ /* Test that fflush() sets errno if the stream was constructed with
+ an invalid file descriptor. */
+ {
+ FILE *fp = fdopen (-1, "w");
+ if (fp != NULL)
+ {
+ fputc ('x', fp);
+ errno = 0;
+ ASSERT (fflush (fp) == EOF);
+ ASSERT (errno == EBADF);
+ }
+ }
+ {
+ FILE *fp;
+ close (99);
+ fp = fdopen (99, "w");
+ if (fp != NULL)
+ {
+ fputc ('x', fp);
+ errno = 0;
+ ASSERT (fflush (fp) == EOF);
+ ASSERT (errno == EBADF);
+ }
+ }
+
+ /* Clean up. */
unlink ("test-fflush.txt");
+
return 0;
}