/* Duplicate an open file descriptor to a specified file descriptor.
- Copyright (C) 1999, 2004-2007, 2009-2011 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2004-2007, 2009-2013 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
# undef dup2
-# if defined _WIN32 || defined __WIN32__
+# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+
+/* Get declarations of the native Windows API functions. */
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
+
# include "msvc-inval.h"
-# ifndef __CYGWIN__
-# define WIN32_LEAN_AND_MEAN
-# include <windows.h>
-# include "msvc-nothrow.h"
-# endif
-static inline int
+/* Get _get_osfhandle. */
+# include "msvc-nothrow.h"
+
+static int
ms_windows_dup2 (int fd, int desired_fd)
{
int result;
-# ifndef __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. */
}
return fd;
}
-# endif
/* Wine 1.0.1 return 0 when desired_fd is negative but not -1:
http://bugs.winehq.org/show_bug.cgi?id=21289 */
}
DONE_MSVC_INVAL;
- /* Cygwin 1.5.x dup2 (1, 1) returns 0. */
if (result == 0)
result = desired_fd;
return result;
}
+
# define dup2 ms_windows_dup2
+
# endif
int
{
int result;
+# ifdef F_GETFL
/* On Linux kernels 2.6.26-2.6.29, dup2 (fd, fd) returns -EBADF.
+ On Cygwin 1.5.x, dup2 (1, 1) returns 0.
+ On Cygwin 1.7.17, dup2 (1, -1) dumps core.
+ On Cygwin 1.7.25, dup2 (1, 256) can dump core.
On Haiku, dup2 (fd, fd) mistakenly clears FD_CLOEXEC. */
+# if HAVE_SETDTABLESIZE
+ setdtablesize (desired_fd + 1);
+# endif
+ if (desired_fd < 0)
+ fd = desired_fd;
if (fd == desired_fd)
return fcntl (fd, F_GETFL) == -1 ? -1 : fd;
+# endif
result = dup2 (fd, desired_fd);