2000-11-06 Gary Houston <ghouston@arglist.com>

2000-11-06  Gary Houston  <ghouston@arglist.com>

	* popen.scm (open-process): bug fix: don't use
	close-all-ports-except to close ports in the child process, since
	it causes port buffers to be flushed.  they may be flushed again
	in the parent, causing duplicate output.  use a more elaborate
	method for setting up the child descriptors (thanks to David
	Pirotte for the bug report).
	standard file descriptors 0, 1, 2 in the child process
	are now set up from current-input-port etc., where possible.