m.seaman at infracaninophile.co.uk
Mon Nov 24 02:51:32 PST 2003
On Mon, Nov 24, 2003 at 01:19:21AM +0000, Jez Hancock wrote:
> - for each pid, send a CHLD signal to the pid
Careful -- not all processes will be set up to deal with SIGCHLD, and
some of them will be set up to deal with it in ways that don't meet
You can use signal '0' to test if a process of a given PID exists,
without obnoxious side effects:
% kill -0 $$
% echo $?
% kill -0 999
999: No such process
% echo $?
However you need to be careful as kill is a shell built-in in many
shells -- tcsh(1) has a built-in but it behaves just like /bin/kill in
this case. sh(1) and bash(1) seem not to use a built-in.
Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks
PGP: http://www.infracaninophile.co.uk/pgpkey Marlow
Tel: +44 1628 476614 Bucks., SL7 1TH UK
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