spawn: Use special invocation for <spawn.h> on OS/2 kLIBC.
[gnulib.git] / tests / test-spawn-pipe-child.c
blob9d4dd174b15d093031e5bfc27b7b7d16c48521bc
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)
7 any later version.
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/>. */
17 #include <config.h>
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <stdint.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <unistd.h>
26 #if defined _WIN32 && ! defined __CYGWIN__
27 /* Get declarations of the native Windows API functions. */
28 # define WIN32_LEAN_AND_MEAN
29 # include <windows.h>
30 #endif
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
39 #include "macros.h"
41 static FILE *myerr;
43 /* In this file, we use only system functions, no overrides from gnulib. */
44 #undef atoi
45 #undef close
46 #undef fcntl
47 #undef fdopen
48 #undef fflush
49 #undef fprintf
50 #undef read
51 #undef write
52 #if defined _WIN32 && !defined __CYGWIN__
53 # define fdopen _fdopen
54 #endif
56 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
57 static void __cdecl
58 gl_msvc_invalid_parameter_handler (const wchar_t *expression,
59 const wchar_t *function,
60 const wchar_t *file,
61 unsigned int line,
62 uintptr_t dummy)
65 #endif
67 /* Return non-zero if FD is open. */
68 static int
69 is_open (int fd)
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;
76 #else
77 # ifndef F_GETFL
78 # error Please port fcntl to your platform
79 # endif
80 return 0 <= fcntl (fd, F_GETFL);
81 #endif
84 int
85 main (int argc, char *argv[])
87 /* fd 2 might be closed, but fd BACKUP_STDERR_FILENO is the original
88 stderr. */
89 myerr = fdopen (BACKUP_STDERR_FILENO, "w");
90 if (!myerr)
91 return 2;
93 ASSERT (argc == 2);
95 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
96 /* Avoid exceptions from within _get_osfhandle. */
97 _set_invalid_parameter_handler (gl_msvc_invalid_parameter_handler);
98 #endif
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);
108 buffer[0]++;
109 ASSERT (write (STDOUT_FILENO, buffer, 1) == 1);
111 switch (atoi (argv[1]))
113 case 0:
114 /* Expect fd 2 is open. */
115 ASSERT (is_open (STDERR_FILENO));
116 break;
117 case 1:
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));
124 #endif
125 break;
126 default:
127 ASSERT (0);
130 int fd;
131 for (fd = 3; fd < 7; fd++)
133 errno = 0;
134 ASSERT (close (fd) == -1);
135 ASSERT (errno == EBADF);
138 return 0;