Date: Wed, 23 Sep 1998 11:11:19 -0500 From: Dan Nelson <dnelson@emsphone.com> To: Andre Albsmeier <andre.albsmeier@mchp.siemens.de>, Jon Hamilton <hamilton@pobox.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: How to get the PID before a program is run? (No joke :-) Message-ID: <19980923111119.A2733@emsphone.com> In-Reply-To: <199809231400.QAA00941@internal>; from "Andre Albsmeier" on Wed Sep 23 16:00:18 GMT 1998 References: <199809231352.PAA05460@david.siemens.de> <199809231400.QAA00941@internal>
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In the last episode (Sep 23), Andre Albsmeier said: > someone wrote: > > In message <199809230729.JAA12131@internal>, Andre Albsmeier wrote: > > } I want to start a program but I need its PID before it is run. > > } One way would be to load the program and send a -STOP signal very > > } quickly. Then I have got the PID, can do some things and send a > > } -CONT signal when finished. > > > > It's actually fairly simple, though somewhat off the beaten path. > > Something like: > > > > #!/bin/sh > > echo "PID is $$" > > exec /your/program/here > > OK, this replaces my shell script. But I have to do some stuff later > when /your/program/here is finished. Well, you could call that script from _another_ script :) You should be able to do this in one shell script, like this: #! /bin/sh ( echo $$ > /var/run/prog.pid echo 'program starting with pid $$' exec /bin/prog ) echo 'program finished' ,but according to the sh manpage, subshells keep $$ at the original shell's pid, so $$ in the above script has the wrong pid. You'll have to split it into two scripts. -Dan To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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