1 /* -*- buffer-read-only: t -*- vi: set ro: */
2 /* DO NOT EDIT! GENERATED AUTOMATICALLY! */
3 /* Duplicate an open file descriptor to a specified file descriptor.
5 Copyright (C) 1999, 2004-2007, 2009-2013 Free Software Foundation, Inc.
7 This program is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 /* written by Paul Eggert */
34 # if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
36 /* Get declarations of the native Windows API functions. */
37 # define WIN32_LEAN_AND_MEAN
40 # include "msvc-inval.h"
42 /* Get _get_osfhandle. */
43 # include "msvc-nothrow.h"
46 ms_windows_dup2 (int fd, int desired_fd)
50 /* If fd is closed, mingw hangs on dup2 (fd, fd). If fd is open,
51 dup2 (fd, fd) returns 0, but all further attempts to use fd in
52 future dup2 calls will hang. */
55 if ((HANDLE) _get_osfhandle (fd) == INVALID_HANDLE_VALUE)
63 /* Wine 1.0.1 return 0 when desired_fd is negative but not -1:
64 http://bugs.winehq.org/show_bug.cgi?id=21289 */
73 result = dup2 (fd, desired_fd);
88 # define dup2 ms_windows_dup2
93 rpl_dup2 (int fd, int desired_fd)
98 /* On Linux kernels 2.6.26-2.6.29, dup2 (fd, fd) returns -EBADF.
99 On Cygwin 1.5.x, dup2 (1, 1) returns 0.
100 On Cygwin 1.7.17, dup2 (1, -1) dumps core.
101 On Haiku, dup2 (fd, fd) mistakenly clears FD_CLOEXEC. */
104 if (fd == desired_fd)
105 return fcntl (fd, F_GETFL) == -1 ? -1 : fd;
108 result = dup2 (fd, desired_fd);
110 /* Correct an errno value on FreeBSD 6.1 and Cygwin 1.5.x. */
111 if (result == -1 && errno == EMFILE)
114 if (fd != desired_fd && result != -1)
115 result = _gl_register_dup (fd, result);
120 #else /* !HAVE_DUP2 */
122 /* On older platforms, dup2 did not exist. */
126 dupfd (int fd, int desired_fd)
128 int duplicated_fd = dup (fd);
129 if (duplicated_fd < 0 || duplicated_fd == desired_fd)
130 return duplicated_fd;
133 int r = dupfd (fd, desired_fd);
135 close (duplicated_fd);
143 dup2 (int fd, int desired_fd)
145 int result = fcntl (fd, F_GETFL) < 0 ? -1 : fd;
146 if (result == -1 || fd == desired_fd)
150 result = fcntl (fd, F_DUPFD, desired_fd);
153 result = _gl_register_dup (fd, result);
156 result = dupfd (fd, desired_fd);
158 if (result == -1 && (errno == EMFILE || errno == EINVAL))
162 #endif /* !HAVE_DUP2 */