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/* Test of POSIX compatible fflush() function.
Copyright (C) 2007, 2009-2022 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
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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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, see <https://www.gnu.org/licenses/>. */
/* Written by Eric Blake, 2007. */
#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)
{
FILE *f;
char buffer[10];
int fd;
/* Create test file. */
f = fopen ("test-fflush.txt", "w");
if (!f || fwrite ("1234567890ABCDEFG", 1, 17, f) != 17 || fclose (f) != 0)
{
fputs ("Failed to create sample file.\n", stderr);
unlink ("test-fflush.txt");
return 1;
}
/* 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);
if (f)
fclose (f);
unlink ("test-fflush.txt");
return 1;
}
/* 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);
fclose (f);
unlink ("test-fflush.txt");
return 1;
}
#endif
/* POSIX requires fflush-fseek to set file offset of fd. */
if (fflush (f) != 0 || fseeko (f, 0, SEEK_CUR) != 0)
{
fputs ("Failed to flush-fseek sample file.\n", stderr);
fclose (f);
unlink ("test-fflush.txt");
return 1;
}
/* Check that offset is correct. */
if (lseek (fd, 0, SEEK_CUR) != 5)
{
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 file reading resumes at correct location. */
if (fgetc (f) != '6')
{
fputs ("Failed to read next byte after fseek.\n", stderr);
fclose (f);
unlink ("test-fflush.txt");
return 1;
}
/* For deterministic results, ensure f read a bigger buffer. */
if (lseek (fd, 0, SEEK_CUR) == 6)
{
fputs ("Sample file was not buffered after fgetc.\n", stderr);
fclose (f);
unlink ("test-fflush.txt");
return 1;
}
/* POSIX requires fflush-fseeko to set file offset of fd. */
if (fflush (f) != 0 || fseeko (f, 0, SEEK_CUR) != 0)
{
fputs ("Failed to flush-fseeko sample file.\n", stderr);
fclose (f);
unlink ("test-fflush.txt");
return 1;
}
/* Check that offset is correct. */
if (lseek (fd, 0, SEEK_CUR) != 6)
{
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;
}
/* Check that file reading resumes at correct location. */
if (fgetc (f) != '7')
{
fputs ("Failed to read next byte after fseeko.\n", stderr);
fclose (f);
unlink ("test-fflush.txt");
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;
}
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