1 /* Child program invoked by test-spawn-pipe-main.
2 Copyright (C) 2009-2021 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, see <https://www.gnu.org/licenses/>. */
26 #if defined _WIN32 && ! defined __CYGWIN__
27 /* Get declarations of the native Windows API functions. */
28 # define WIN32_LEAN_AND_MEAN
32 /* Depending on arguments, this test intentionally closes stderr or
33 starts life with stderr closed. So, we arrange to have fd 10
34 (outside the range of interesting fd's during the test) set up to
35 duplicate the original stderr. */
37 #define BACKUP_STDERR_FILENO 10
38 #define ASSERT_STREAM myerr
43 /* In this file, we use only system functions, no overrides from gnulib. */
52 #if defined _WIN32 && !defined __CYGWIN__
53 # define fdopen _fdopen
56 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
58 gl_msvc_invalid_parameter_handler (const wchar_t *expression,
59 const wchar_t *function,
67 /* Return non-zero if FD is open. */
71 #if defined _WIN32 && ! defined __CYGWIN__
72 /* On native Windows, the initial state of unassigned standard file
73 descriptors is that they are open but point to an
74 INVALID_HANDLE_VALUE, and there is no fcntl. */
75 return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
78 # error Please port fcntl to your platform
80 return 0 <= fcntl (fd, F_GETFL);
85 main (int argc, char *argv[])
87 /* fd 2 might be closed, but fd BACKUP_STDERR_FILENO is the original
89 myerr = fdopen (BACKUP_STDERR_FILENO, "w");
95 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
96 /* Avoid exceptions from within _get_osfhandle. */
97 _set_invalid_parameter_handler (gl_msvc_invalid_parameter_handler);
100 /* Read one byte from fd 0, and write its value plus one to fd 1.
101 fd 2 should be closed iff the argument is 1. Check that no other file
102 descriptors leaked. */
104 char buffer[2] = { 's', 't' };
106 ASSERT (read (STDIN_FILENO, buffer, 2) == 1);
109 ASSERT (write (STDOUT_FILENO, buffer, 1) == 1);
111 switch (atoi (argv[1]))
114 /* Expect fd 2 is open. */
115 ASSERT (is_open (STDERR_FILENO));
118 /* Expect fd 2 is closed.
119 But on HP-UX 11, fd 2 gets automatically re-opened to /dev/null if it
120 was closed. Similarly on native Windows. Future POSIX will allow
121 this, see <http://austingroupbugs.net/view.php?id=173>. */
122 #if !(defined __hpux || (defined _WIN32 && ! defined __CYGWIN__))
123 ASSERT (! is_open (STDERR_FILENO));
131 for (fd = 3; fd < 7; fd++)
134 ASSERT (close (fd) == -1);
135 ASSERT (errno == EBADF);