115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
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/* Test of fclose module.
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Copyright (C) 2011-2021 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>. */
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/* Written by Eric Blake. */
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#include <config.h>
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#include <stdio.h>
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#include "signature.h"
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SIGNATURE_CHECK (fclose, int, (FILE *));
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "macros.h"
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#define BASE "test-fclose.t"
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int
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main (int argc, char **argv)
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{
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const char buf[] = "hello world";
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int fd;
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int fd2;
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FILE *f;
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/* Prepare a seekable file. */
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fd = open (BASE, O_RDWR | O_CREAT | O_TRUNC, 0600);
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ASSERT (0 <= fd);
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ASSERT (write (fd, buf, sizeof buf) == sizeof buf);
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ASSERT (lseek (fd, 1, SEEK_SET) == 1);
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/* Create an output stream visiting the file; when it is closed, all
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other file descriptors visiting the file must see the new file
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position. */
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fd2 = dup (fd);
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ASSERT (0 <= fd2);
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f = fdopen (fd2, "w");
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ASSERT (f);
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ASSERT (fputc (buf[1], f) == buf[1]);
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ASSERT (fclose (f) == 0);
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errno = 0;
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ASSERT (lseek (fd2, 0, SEEK_CUR) == -1);
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ASSERT (errno == EBADF);
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ASSERT (lseek (fd, 0, SEEK_CUR) == 2);
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/* Likewise for an input stream. */
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fd2 = dup (fd);
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ASSERT (0 <= fd2);
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f = fdopen (fd2, "r");
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ASSERT (f);
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ASSERT (fgetc (f) == buf[2]);
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ASSERT (fclose (f) == 0);
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errno = 0;
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ASSERT (lseek (fd2, 0, SEEK_CUR) == -1);
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ASSERT (errno == EBADF);
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ASSERT (lseek (fd, 0, SEEK_CUR) == 3);
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/* Test that fclose() sets errno if someone else closes the stream
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fd behind the back of stdio. */
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{
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FILE *fp = fdopen (fd, "w+");
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ASSERT (fp != NULL);
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ASSERT (close (fd) == 0);
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errno = 0;
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ASSERT (fclose (fp) == EOF);
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ASSERT (errno == EBADF);
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}
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/* Test that fclose() sets errno if the stream was constructed with
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an invalid file descriptor. */
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{
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FILE *fp = fdopen (-1, "r");
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if (fp != NULL)
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{
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errno = 0;
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ASSERT (fclose (fp) == EOF);
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ASSERT (errno == EBADF);
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}
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}
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{
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FILE *fp;
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close (99);
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fp = fdopen (99, "r");
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if (fp != NULL)
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{
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errno = 0;
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ASSERT (fclose (fp) == EOF);
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ASSERT (errno == EBADF);
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}
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}
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/* Clean up. */
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ASSERT (remove (BASE) == 0);
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return 0;
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}
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