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, 2009-2011 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 */
30 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
31 /* Get declarations of the Win32 API functions. */
32 # define WIN32_LEAN_AND_MEAN
41 rpl_dup2 (int fd, int desired_fd)
44 # if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
45 /* If fd is closed, mingw hangs on dup2 (fd, fd). If fd is open,
46 dup2 (fd, fd) returns 0, but all further attempts to use fd in
47 future dup2 calls will hang. */
50 if ((HANDLE) _get_osfhandle (fd) == INVALID_HANDLE_VALUE)
57 /* Wine 1.0.1 return 0 when desired_fd is negative but not -1:
58 http://bugs.winehq.org/show_bug.cgi?id=21289 */
64 # elif !defined __linux__
65 /* On Haiku, dup2 (fd, fd) mistakenly clears FD_CLOEXEC. */
67 return fcntl (fd, F_GETFL) == -1 ? -1 : fd;
69 result = dup2 (fd, desired_fd);
71 /* Correct a Linux return value.
72 <http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.30.y.git;a=commitdiff;h=2b79bc4f7ebbd5af3c8b867968f9f15602d5f802>
74 if (fd == desired_fd && result == (unsigned int) -EBADF)
82 /* Correct a cygwin 1.5.x errno value. */
83 else if (result == -1 && errno == EMFILE)
86 if (fd != desired_fd && result != -1)
87 result = _gl_register_dup (fd, result);
92 #else /* !HAVE_DUP2 */
94 /* On older platforms, dup2 did not exist. */
98 dupfd (int fd, int desired_fd)
100 int duplicated_fd = dup (fd);
101 if (duplicated_fd < 0 || duplicated_fd == desired_fd)
102 return duplicated_fd;
105 int r = dupfd (fd, desired_fd);
107 close (duplicated_fd);
115 dup2 (int fd, int desired_fd)
117 int result = fcntl (fd, F_GETFL) < 0 ? -1 : fd;
118 if (result == -1 || fd == desired_fd)
122 result = fcntl (fd, F_DUPFD, desired_fd);
125 result = _gl_register_dup (fd, result);
128 result = dupfd (fd, desired_fd);
130 if (result == -1 && (errno == EMFILE || errno == EINVAL))
134 #endif /* !HAVE_DUP2 */