Path: utzoo!attcan!uunet!snorkelwacker!bloom-beacon!eru!luth!sunic!lth.se!E89HSE@rigel.efd.lth.se
From: e89hse@rigel.efd.lth.se
Newsgroups: comp.unix.questions
Subject: Re: Is there a system call to check the status of any processes?
Message-ID: <009374EC.B9A700E0@rigel.efd.lth.se>
Date: 27 May 90 19:16:05 GMT
References: <23329@adm.BRL.MIL>,<9005220904.AA01656@samsa.pcs.com>
Sender: newsuser@lth.se (LTH network news server)
Reply-To: e89hse@rigel.efd.lth.se
Organization: Lund Institute of Technology,Lund, Sweden
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In article <9005220904.AA01656@samsa.pcs.com>, wolfgang@samsa.pcs.com (wolfgang) writes:
>In comp.unix.questions you write:
>
>->I knew the "ps" command will show the status of any processes, but is there
>->a system call that can check the status of a process, probably based on
>->the process id? If there is no such a call, how can I check the status
>
>Of course there is one. It is kill(2)! Extract from man: [...]
>[ Program ended...]
>                        while (kill(pid, 0) == 0)
>                                sleep(10);
>                        printf("\007Process %s has ended.\n", *argv);
>                        exit(0);

 Isn't there any more graceful way to do this? I looked the HP-UX manual and it
turned out they had something called waitpid(pid,stat_loc,opt) that can be used
to wait for one (out of many) child process.