Date: Mon, 22 Mar 1999 15:00:33 +0000 From: Karl Pielorz <kpielorz@tdx.co.uk> To: Masahiro Ariga <mariga@cd.mbn.or.jp> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: how to die gracefully Message-ID: <36F65B11.610DAE9D@tdx.co.uk> References: <000501be7472$3bbeb400$064ca8c0@gateway>
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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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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