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From: wmk@baskin.UUCP
Newsgroups: comp.unix.questions
Subject: Shell doesn't pass modified signal mask to sub-processes
Message-ID: <319@baskin.UUCP>
Date: Tue, 7-Apr-87 09:51:59 EST
Article-I.D.: baskin.319
Posted: Tue Apr  7 09:51:59 1987
Date-Received: Sat, 11-Apr-87 06:18:51 EST
Sender: root@baskin.UUCP
Organization: Digital Analysis Corporation
Lines: 21
Keywords: ...and I want it to!  Is there a work-around?

I've "discovered," much to my dismay, that the Bourne shell does
not let me pass the modified signal mask to the sub-processes it
spawns; it only passes the original one.  (We have a Gould 6040
running UTX/32 1.2, a BSD 4.2 system with a little Sys V.)

The situation is:  I run a C program that sets the signal mask
to ignore interrupt and quit signals.  It then calls a /bin/sh
script.  Within that script I reset the mask (i.e., trap 2 3)
and then call another C program.  The mask being passed to that
program still ignores SIGINT and SIGQUIT.

My problem is that _I want to do this_!  Is there a way to do
this from within the shell script?  We could call a second C
program which would reset the mask and _then_ call our programs,
but this seems inelegant.  Are there any better ways?

Thanks in advance,
-- 
Bill Kules                        "We're on the road
...seismo!vrdxhq!baskin!wmk       and we're gunning for the Buddha"
...decuac!baskin!wmk                     -- Shriekback