/* Test of POSIX compatible fflush() function.
- Copyright (C) 2007 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
+ 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
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Eric Blake, 2007. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#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 (int argc, char *argv[])
+main (void)
{
FILE *f;
char buffer[10];
/* Create test file. */
f = fopen ("test-fflush.txt", "w");
- if (!f || fwrite ("1234567890", 1, 10, f) != 10 || fclose (f) != 0)
+ if (!f || fwrite ("1234567890ABCDEFG", 1, 17, f) != 17 || fclose (f) != 0)
{
fputs ("Failed to create sample file.\n", stderr);
unlink ("test-fflush.txt");
/* 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;
}
- /* For deterministic results, ensure f read a bigger buffer. */
+ /* For deterministic results, ensure f read a bigger buffer.
+ This is not the case on BeOS, nor on uClibc. */
+#if !(defined __BEOS__ || defined __UCLIBC__)
if (lseek (fd, 0, SEEK_CUR) == 5)
{
fputs ("Sample file was not buffered after fread.\n", stderr);
unlink ("test-fflush.txt");
return 1;
}
+#endif
/* POSIX requires fflush-fseek to set file offset of fd. */
- if (fflush (f) != 0 || fseek (f, 0, SEEK_CUR) != 0)
+ if (fflush (f) != 0 || fseeko (f, 0, SEEK_CUR) != 0)
{
fputs ("Failed to flush-fseek sample file.\n", stderr);
fclose (f);
/* Check that offset is correct. */
if (lseek (fd, 0, SEEK_CUR) != 5)
{
- fputs ("File offset is wrong after fseek.\n", stderr);
+ fprintf (stderr, "File offset is wrong after fseek: %ld.\n",
+ (long) lseek (fd, 0, SEEK_CUR));
+ fclose (f);
+ unlink ("test-fflush.txt");
+ return 1;
+ }
+ if (ftell (f) != 5)
+ {
+ fprintf (stderr, "ftell result is wrong after fseek: %ld.\n",
+ (long) ftell (f));
fclose (f);
unlink ("test-fflush.txt");
return 1;
/* Check that offset is correct. */
if (lseek (fd, 0, SEEK_CUR) != 6)
{
- fputs ("File offset is wrong after fseeko.\n", stderr);
+ fprintf (stderr, "File offset is wrong after fseeko: %ld.\n",
+ (long) lseek (fd, 0, SEEK_CUR));
+ fclose (f);
+ unlink ("test-fflush.txt");
+ return 1;
+ }
+ if (ftell (f) != 6)
+ {
+ fprintf (stderr, "ftell result is wrong after fseeko: %ld.\n",
+ (long) ftell (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;
}