[Win32] Fix the asynchronous g_spawn* to return the process handle of the

[Win32] Fix the asynchronous g_spawn* to return the process handle of the

2002-11-18  Tor Lillqvist  <tml@iki.fi>

	[Win32] Fix the asynchronous g_spawn* to return the process handle
	of the started program properly. (Note: not the process id. The
	spawn*() functions in the C runtime return the created process's
	handle. There doesn't seem to be any way to get the process id of
	a child process if you have the handle. But then, the process
	handle usually is more useful anyway.)

	* glib/gspawn-win32-helper.c (WinMain): If the spawning of the
	child process succeeded, and if asynchronous spawn (P_NOWAIT),
	write the result handle up to the parent process, waiting to read
	it in do_spawn_with_pipes().

	* glib/gspawn-win32.c (do_spawn): Use return value from spawning
	the helper. If it is -1 the helper wasn't found or couldn't be run
	for some reason. Otherwise it is the helper's process handle.

	(g_spawn_async_with_pipes): Pass the child_pid parameter on to
	do_spawn_with_pipes().

	(do_spawn_with_pipes): Take also a child_pid parameter. If
	do_spawn() returned -1, fail immediately. Otherwise make the
	handle passed to us by the helper process into a handle valid in
	this process by calling DuplicateHandle().