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Path: utzoo!linus!philabs!sbcs!shaji
From: shaji@sbcs.UUCP (Shaji Bhaskar)
Newsgroups: net.emacs,net.unix
Subject: UNIX and/or Gosling Emacs problem.
Message-ID: <441@sbcs.UUCP>
Date: Tue, 27-Aug-85 13:56:10 EDT
Article-I.D.: sbcs.441
Posted: Tue Aug 27 13:56:10 1985
Date-Received: Thu, 29-Aug-85 21:18:53 EDT
Distribution: net
Organization: Computer Science Dept, SUNY@Stony Brook
Lines: 30
Xref: linus net.emacs:1203 net.unix:4882

I have a problem with process handling in Gosling Emacs (V2.01).
running under UNIX 4.2.  What I need to do is to leave a process
running in the background even after Emacs exits.  I start the
process using "start-filtered-process".  I send the process something
on its standard input using a "region-to-process", send an EOF to the
process, and then exit emacs.  However, Emacs kills my process if it
is still running.  Setting the variable "silently-kill-processes" to
0 is supposed to do the trick.  However, Emacs appears to be sending
a SIGHUP to its children regardless.  I do not know whether the
problem is with UNIX pseudo ttys or an EMACS bug, so I am posting
this to both net.unix and net.emacs.  

I have tried explicitly ignoring the signal in my child process, but
it is possible that the process receives the SIGHUP before it does a
signal(SIGHUP, SIG_IGN), leaving me with a dead pocess when I think I
have a running process.  I need a way around this problem that is
elegant.  

Is this a well-known problem?  Are there any easy fixes?  I do not
want to hack the source of Emacs unless it is to remove the bug (if
any) that causes this signal to be sent.  In particular, I dont want
to hack Emacs to create children that ignore SIGHUP, unless the
problem is caused by the operating system's process handling
mechanism, but am willing to try it as a last-ditch measure.

* Yet another reason for switching to GNUEmacs, maybe? :-) *

Shaji Bhaskar, Dept of Comp. Sc., SUNY@Stony Brook.
UUCP : {allegra, philabs}!shaji
CSnet : shaji@sbcs.csnet