1 /* Test duplicating non-inheritable file descriptors.
2 Copyright (C) 2009 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 of the License, or
7 (at your option) 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 <http://www.gnu.org/licenses/>. */
17 /* Written by Eric Blake <ebb9@byu.net>, 2009. */
29 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
30 /* Get declarations of the Win32 API functions. */
31 # define WIN32_LEAN_AND_MEAN
35 #define ASSERT(expr) \
40 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
47 /* Return non-zero if FD is open and inheritable across exec/spawn. */
49 is_inheritable (int fd)
51 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
52 /* On Win32, the initial state of unassigned standard file
53 descriptors is that they are open but point to an
54 INVALID_HANDLE_VALUE, and there is no fcntl. */
55 HANDLE h = (HANDLE) _get_osfhandle (fd);
57 if (h == INVALID_HANDLE_VALUE || GetHandleInformation (h, &flags) == 0)
59 return (flags & HANDLE_FLAG_INHERIT) != 0;
62 # error Please port fcntl to your platform
64 int i = fcntl (fd, F_GETFD);
65 return 0 <= i && (i & FD_CLOEXEC) == 0;
72 const char *file = "test-cloexec.tmp";
73 int fd = creat (file, 0600);
76 /* Assume std descriptors were provided by invoker. */
77 ASSERT (STDERR_FILENO < fd);
78 ASSERT (is_inheritable (fd));
80 /* Normal use of set_cloexec_flag. */
81 ASSERT (set_cloexec_flag (fd, true) == 0);
82 #if !((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__)
83 ASSERT (!is_inheritable (fd));
85 ASSERT (set_cloexec_flag (fd, false) == 0);
86 ASSERT (is_inheritable (fd));
88 /* Normal use of dup_cloexec. */
89 fd2 = dup_cloexec (fd);
91 ASSERT (!is_inheritable (fd2));
92 ASSERT (close (fd) == 0);
93 ASSERT (dup_cloexec (fd2) == fd);
94 ASSERT (!is_inheritable (fd));
95 ASSERT (close (fd2) == 0);
97 /* Test error handling. */
99 ASSERT (set_cloexec_flag (-1, false) == -1);
100 ASSERT (errno == EBADF);
102 ASSERT (set_cloexec_flag (10000000, false) == -1);
103 ASSERT (errno == EBADF);
105 ASSERT (set_cloexec_flag (fd2, false) == -1);
106 ASSERT (errno == EBADF);
108 ASSERT (dup_cloexec (-1) == -1);
109 ASSERT (errno == EBADF);
111 ASSERT (dup_cloexec (10000000) == -1);
112 ASSERT (errno == EBADF);
114 ASSERT (dup_cloexec (fd2) == -1);
115 ASSERT (errno == EBADF);
118 ASSERT (close (fd) == 0);
119 ASSERT (unlink (file) == 0);