static int
ms_windows_dup2 (int fd, int desired_fd)
{
int result;
/* If fd is closed, mingw hangs on dup2 (fd, fd). If fd is open,
dup2 (fd, fd) returns 0, but all further attempts to use fd in
future dup2 calls will hang. */
if (fd == desired_fd)
{
if ((HANDLE) _get_osfhandle (fd) == INVALID_HANDLE_VALUE)
{
errno = EBADF;
return -1;
}
return fd;
}
/* Wine 1.0.1 return 0 when desired_fd is negative but not -1:
https://bugs.winehq.org/show_bug.cgi?id=21289 */
if (desired_fd < 0)
{
errno = EBADF;
return -1;
}
result = dup2_nothrow (fd, desired_fd);
if (result == 0)
result = desired_fd;
return result;
}
int
rpl_dup2 (int fd, int desired_fd)
{
int result;
# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
/* If fd is closed, mingw hangs on dup2 (fd, fd). If fd is open,
dup2 (fd, fd) returns 0, but all further attempts to use fd in
future dup2 calls will hang. */
if (fd == desired_fd)
{
if ((HANDLE) _get_osfhandle (fd) == INVALID_HANDLE_VALUE)
{
errno = EBADF;
return -1;
}
return fd;
}
/* Wine 1.0.1 return 0 when desired_fd is negative but not -1:
http://bugs.winehq.org/show_bug.cgi?id=21289 */
if (desired_fd < 0)
{
errno = EBADF;
return -1;
}
# elif !defined __linux__
/* On Haiku, dup2 (fd, fd) mistakenly clears FD_CLOEXEC. */
if (fd == desired_fd)
return fcntl (fd, F_GETFL) == -1 ? -1 : fd;
# endif
result = dup2_nothrow (fd, desired_fd);
# ifdef __linux__
/* Correct a Linux return value.
<http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.30.y.git;a=commitdiff;h=2b79bc4f7ebbd5af3c8b867968f9f15602d5f802>
*/
if (fd == desired_fd && result == (unsigned int) -EBADF)
{
errno = EBADF;
result = -1;
}
# endif
if (result == 0)
result = desired_fd;
/* Correct a cygwin 1.5.x errno value. */
else if (result == -1 && errno == EMFILE)
errno = EBADF;
# if REPLACE_FCHDIR
if (fd != desired_fd && result != -1)
result = _gl_register_dup (fd, result);
# endif
return result;
}