Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ihnp4!ptsfa!ames!ucbcad!ucbvax!hplabs!hpcea!hpfcdc!stroyan
From: stroyan@hpfcdc.HP.COM (Mike Stroyan)
Newsgroups: comp.unix.wizards
Subject: Re: signal handling,c-shell,hp840
Message-ID: <5980012@hpfcdc.HP.COM>
Date: 15 Dec 87 03:34:06 GMT
References: <7649@eddie.MIT.EDU>
Organization: HP Ft. Collins, Co.
Lines: 14

An interactive csh will not exit when it receives a SIGINT signal, since
it is assumed that the SIGINT was intended for a child job.  A csh which
is excuting a shell script like foo.csh does exit, assuming that the
user intended to stop the shell script.  You can tell the foo.csh csh
to ignore SIGINT signals by putting "onintr -" into foo.csh.  You can
also tell csh to jump to a label by putting "onintr <label>" in foo.csh.

The child, foo, is not actually terminated if foo.csh exits.  It catches
the SIGINT signal and continues to run in the background, but does not
see further break or intr characters from the keyboard because it is in
another process group from the interactive shell.  You can still send it
SIGINT signals with the kill command.

Mike Stroyan, [hplabs!]hpfcla!stroyan