From owner-freebsd-questions  Mon Mar 22  7: 1:49 1999
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Date: Mon, 22 Mar 1999 15:00:33 +0000
From: Karl Pielorz <kpielorz@tdx.co.uk>
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To: Masahiro Ariga <mariga@cd.mbn.or.jp>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: how to die gracefully
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Masahiro Ariga wrote:

> First loaded program works fine,and enters Ctl^C to exit it,but if I execute
> it second time,it shows abnormalties like taking time to start to send data
> to clent,and badly enough,it responds not at all.
> I presume it results from not closing sockets,or residual memory or
> something,but I'm not sure.

AFAIK - when your program quit's, the O/S should free up it's memory and close
it's files etc. (as a kind of last-resort) - it's probably not good practice
to rely on this though, especially if your program is designed to run for long
periods of time...
 
> So,sinior UNIX programers,would you teach me next two questions ?
> 
> 1.How should I exit gracefully by pushing Ctl^C. I mean,what should I do to
> recover normal condition in preparation for next execution ?

Catch the CTRL-C signal, then perform housekeeping & cleanup (i.e. close
files, sockets, freeup memory used etc. - all of which your program should
have tracked etc.), then quit...

> 2.I like to catch the signal when pushed Ctl^C,and make a handler
> routine.Would you tell me what signal I can catch when enterring Ctl^C ?

SIGQUIT I think - check the man pages out (man signal)...

-Kp


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