/* Duplicate an open file descriptor to a specified file descriptor.
- Copyright (C) 1999, 2004, 2005, 2006, 2007, 2009 Free Software
- Foundation, Inc.
+ Copyright (C) 1999, 2004-2007, 2009-2018 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
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* written by Paul Eggert */
#include <errno.h>
#include <fcntl.h>
-#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
-/* Get declarations of the Win32 API functions. */
-# define WIN32_LEAN_AND_MEAN
-# include <windows.h>
-#endif
-
-#if REPLACE_DUP2
+#if HAVE_DUP2
# undef dup2
-int
-rpl_dup2 (int fd, int desired_fd)
+# if defined _WIN32 && ! defined __CYGWIN__
+
+/* Get declarations of the native Windows API functions. */
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
+
+# if HAVE_MSVC_INVALID_PARAMETER_HANDLER
+# include "msvc-inval.h"
+# endif
+
+/* Get _get_osfhandle. */
+# if GNULIB_MSVC_NOTHROW
+# include "msvc-nothrow.h"
+# else
+# include <io.h>
+# endif
+
+# if HAVE_MSVC_INVALID_PARAMETER_HANDLER
+static int
+dup2_nothrow (int fd, int desired_fd)
{
int result;
-# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+
+ TRY_MSVC_INVAL
+ {
+ result = dup2 (fd, desired_fd);
+ }
+ CATCH_MSVC_INVAL
+ {
+ errno = EBADF;
+ result = -1;
+ }
+ DONE_MSVC_INVAL;
+
+ return result;
+}
+# else
+# define dup2_nothrow dup2
+# endif
+
+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. */
}
return fd;
}
-# endif
- result = dup2 (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)
+
+ /* 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;
- result = -1;
+ return -1;
}
-# endif
+
+ result = dup2_nothrow (fd, desired_fd);
+
if (result == 0)
result = desired_fd;
- /* Correct a cygwin 1.5.x errno value. */
- else if (result == -1 && errno == EMFILE)
+
+ return result;
+}
+
+# define dup2 ms_windows_dup2
+
+# elif defined __KLIBC__
+
+# include <InnoTekLIBC/backend.h>
+
+static int
+klibc_dup2dirfd (int fd, int desired_fd)
+{
+ int tempfd;
+ int dupfd;
+
+ tempfd = open ("NUL", O_RDONLY);
+ if (tempfd == -1)
+ return -1;
+
+ if (tempfd == desired_fd)
+ {
+ close (tempfd);
+
+ char path[_MAX_PATH];
+ if (__libc_Back_ioFHToPath (fd, path, sizeof (path)))
+ return -1;
+
+ return open(path, O_RDONLY);
+ }
+
+ dupfd = klibc_dup2dirfd (fd, desired_fd);
+
+ close (tempfd);
+
+ return dupfd;
+}
+
+static int
+klibc_dup2 (int fd, int desired_fd)
+{
+ int dupfd;
+ struct stat sbuf;
+
+ dupfd = dup2 (fd, desired_fd);
+ if (dupfd == -1 && errno == ENOTSUP \
+ && !fstat (fd, &sbuf) && S_ISDIR (sbuf.st_mode))
+ {
+ close (desired_fd);
+
+ return klibc_dup2dirfd (fd, desired_fd);
+ }
+
+ return dupfd;
+}
+
+# define dup2 klibc_dup2
+# endif
+
+int
+rpl_dup2 (int fd, int desired_fd)
+{
+ 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);
+
+ /* Correct an errno value on FreeBSD 6.1 and Cygwin 1.5.x. */
+ if (result == -1 && errno == EMFILE)
errno = EBADF;
-#if REPLACE_FCHDIR
- if (fd != desired_fd && result == desired_fd)
- result = _gl_register_dup (fd, desired_fd);
-#endif
+# if REPLACE_FCHDIR
+ if (fd != desired_fd && result != -1)
+ result = _gl_register_dup (fd, result);
+# endif
return result;
}
-#else /* !REPLACE_DUP2 */
+#else /* !HAVE_DUP2 */
/* On older platforms, dup2 did not exist. */
int
dup2 (int fd, int desired_fd)
{
- int result;
- if (fd == desired_fd)
- return fcntl (fd, F_GETFL) < 0 ? -1 : fd;
+ int result = fcntl (fd, F_GETFL) < 0 ? -1 : fd;
+ if (result == -1 || fd == desired_fd)
+ return result;
close (desired_fd);
# ifdef F_DUPFD
result = fcntl (fd, F_DUPFD, desired_fd);
+# if REPLACE_FCHDIR
+ if (0 <= result)
+ result = _gl_register_dup (fd, result);
+# endif
# else
result = dupfd (fd, desired_fd);
# endif
-#if REPLACE_FCHDIR
- if (0 <= result)
- result = _gl_register_dup (fd, desired_fd);
-#endif
+ if (result == -1 && (errno == EMFILE || errno == EINVAL))
+ errno = EBADF;
return result;
}
-#endif /* !REPLACE_DUP2 */
+#endif /* !HAVE_DUP2 */