Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!sharkey!itivax!umich!zip!spencer
From: spencer@eecs.umich.edu (Spencer W. Thomas)
Newsgroups: comp.windows.x
Subject: Re: fork() and popen() in an X environment
Message-ID: <SPENCER.89Sep8113539@spline.eecs.umich.edu>
Date: 8 Sep 89 15:35:39 GMT
References: <1015@apctrc.UUCP>
Sender: news@zippy.eecs.umich.edu
Distribution: na
Organization: University of Michigan EECS Dept
Lines: 17
In-reply-to: zjmw0a@apctrc.trc.amoco.com's message of 7 Sep 89 22:01:23 GMT

Problem summary: process forks, then exits, but windows stay up until
subprocess also exits.

Solution: (I think) close the display connection after fork and before
exec.  You can set the "close on exec" flag for the display connection by:

#include <fcntl.h>

	fcntl( ConnectionNumber(display), F_SETFD, 1 );

Oddities dept: I had to make one other change to get the program to
work as advertised: I had to change the pclose to a close, apparently
pclose (Sun OS 4.0.1) waits for the child to exit?


--
=Spencer (spencer@eecs.umich.edu)