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/* Test of fseeko() function.
Copyright (C) 2011-2022 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/>. */
#include <config.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include "macros.h"
int
main (int argc, char **argv)
{
const char *filename = argv[1];
/* Test that fseeko() sets errno if someone else closes the stream
fd behind the back of stdio. */
{
FILE *fp = fopen (filename, "r");
ASSERT (fp != NULL);
setvbuf (fp, NULL, _IONBF, 0);
ASSERT (ftell (fp) == 0);
ASSERT (fseeko (fp, 0, SEEK_END) == 0);
ASSERT (ftell (fp) > 0);
ASSERT (close (fileno (fp)) == 0);
errno = 0;
ASSERT (fseeko (fp, 0, SEEK_SET) == -1);
ASSERT (errno == EBADF);
fclose (fp);
}
/* Test that fseeko() sets errno if the stream was constructed with
an invalid file descriptor. */
{
FILE *fp = fdopen (-1, "w");
if (fp != NULL)
{
errno = 0;
ASSERT (fseeko (fp, 0, SEEK_END) == -1);
ASSERT (errno == EBADF);
fclose (fp);
}
}
{
FILE *fp;
close (99);
fp = fdopen (99, "w");
if (fp != NULL)
{
errno = 0;
ASSERT (fseeko (fp, 0, SEEK_END) == -1);
ASSERT (errno == EBADF);
fclose (fp);
}
}
return 0;
}
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