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120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/* Child program invoked by test-spawn-pipe-main.
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Copyright (C) 2009-2017 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 <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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/* Get declarations of the native Windows API functions. */
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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#endif
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/* Depending on arguments, this test intentionally closes stderr or
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starts life with stderr closed. So, we arrange to have fd 10
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(outside the range of interesting fd's during the test) set up to
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duplicate the original stderr. */
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#define BACKUP_STDERR_FILENO 10
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#define ASSERT_STREAM myerr
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#include "macros.h"
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static FILE *myerr;
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/* In this file, we use only system functions, no overrides from gnulib. */
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#undef atoi
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#undef close
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#undef fcntl
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#undef fdopen
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#undef fflush
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#undef fprintf
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#undef read
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#undef write
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/* Return non-zero if FD is open. */
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static int
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is_open (int fd)
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{
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#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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/* On native Windows, the initial state of unassigned standard file
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descriptors is that they are open but point to an
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INVALID_HANDLE_VALUE, and there is no fcntl. */
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return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
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#else
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# ifndef F_GETFL
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# error Please port fcntl to your platform
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# endif
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return 0 <= fcntl (fd, F_GETFL);
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#endif
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}
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int
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main (int argc, char *argv[])
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{
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char buffer[2] = { 's', 't' };
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int fd;
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/* fd 2 might be closed, but fd BACKUP_STDERR_FILENO is the original
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stderr. */
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myerr = fdopen (BACKUP_STDERR_FILENO, "w");
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if (!myerr)
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return 2;
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ASSERT (argc == 2);
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/* Read one byte from fd 0, and write its value plus one to fd 1.
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fd 2 should be closed iff the argument is 1. Check that no other file
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descriptors leaked. */
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ASSERT (read (STDIN_FILENO, buffer, 2) == 1);
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buffer[0]++;
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ASSERT (write (STDOUT_FILENO, buffer, 1) == 1);
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switch (atoi (argv[1]))
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{
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case 0:
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/* Expect fd 2 is open. */
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ASSERT (is_open (STDERR_FILENO));
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break;
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case 1:
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/* Expect fd 2 is closed.
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But on HP-UX 11, fd 2 gets automatically re-opened to /dev/null if it
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was closed. Future POSIX will allow this, see
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<http://austingroupbugs.net/view.php?id=173>. */
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#if !defined __hpux
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ASSERT (! is_open (STDERR_FILENO));
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#endif
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break;
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default:
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ASSERT (0);
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}
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for (fd = 3; fd < 7; fd++)
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{
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errno = 0;
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ASSERT (close (fd) == -1);
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ASSERT (errno == EBADF);
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}
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return 0;
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}
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