/**
* Creates a new duplicate of a standard file handle.
*
* Constructs a new \a file_handle object that owns a duplicate of a
* standard file handle. The \a d parameter specifies which standard
* file handle to duplicate and can be one of \a STD_INPUT_HANDLE,
* \a STD_OUTPUT_HANDLE or \a STD_ERROR_HANDLE. The duplicate's
* inheritable flag is set to the value of \a inheritable.
*
* This operation is only available in Windows systems.
*
* \pre \a d refers to one of the standard handles as described above.
* \return A file handle owning a duplicate of the standard handle
* referred to by \a d.
* \throw boost::system::system_error If GetStdHandle() or
* DuplicateHandle() fails.
*/
static file_handle win32_std(DWORD d, bool inheritable)
{
BOOST_ASSERT(d == STD_INPUT_HANDLE || d == STD_OUTPUT_HANDLE || d == STD_ERROR_HANDLE);
HANDLE h = ::GetStdHandle(d);
if (h == INVALID_HANDLE_VALUE)
boost::throw_exception(boost::system::system_error(boost::system::error_code(::GetLastError(), boost::system::get_system_category()), "boost::process::detail::file_handle::win32_std: GetStdHandle failed"));
return win32_dup(h, inheritable);
}
int __wrap_dup(int oldfd)
{
int rc;
rc = win32_dup(oldfd);
/* -1 means we should've win32_dup'd it but it failed */
if(rc == -1)
return -1;
if(rc > 0)
return rc;
return __real_dup(oldfd);
}
inline
file_handle
file_handle::win32_std(DWORD d, bool inheritable)
{
BOOST_ASSERT(d == STD_INPUT_HANDLE ||
d == STD_OUTPUT_HANDLE ||
d == STD_ERROR_HANDLE);
HANDLE h = ::GetStdHandle(d);
if (h == INVALID_HANDLE_VALUE)
boost::throw_exception
(system_error("boost::process::detail::file_handle::win32_std",
"GetStdHandle failed", ::GetLastError()));
return win32_dup(h, inheritable);
}
