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From: eric@mks.com (Eric Gisin)
Newsgroups: comp.emacs,gnu.emacs.bug
Subject: Re: emacs hangs when invoke from a subshell
Summary: SIGIO bug in BSD
Message-ID: <1989Dec1.011823.27293@mks.com>
Date: 1 Dec 89 01:18:23 GMT
References: <8911290316.AA17359@soulcatcher.uk.oracle.com>
Organization: Mortice Kern Systems Inc., Waterloo, Ontario, CANADA
Lines: 14

When the process group id is not equal to the process id
on BSD, the SIGIO signals do not get sent to emacs and it hangs.
This happens if your shell does not have job control,
or a sub-shell invokes emacs.

A quick hack is to write a front end to emacs:
main(argc, argv) {
	/* set process group to process id */
	setpgrp(0, getpgrp(0));
	execl(real_emacs, argv);
}

You can also put the setpgrp in emacs' startup
(I'm not sure if this breaks anything).


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