wait for particular process pid
in [Unix Programming]
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From: Sasha on 7 Apr 2010 18:45 Is there way on UNIX to wait for particular process (not child process) identified by pid? I know how to wait for a child process but is there way to wait for not child process?
From: David Schwartz on 7 Apr 2010 19:46 On Apr 7, 3:45 pm, Sasha <agal...(a)audible.com> wrote: > Is there way on UNIX to wait for particular process (not child > process) identified by pid? I know how to wait for a child process but > is there way to wait for not child process? There's no way. But there's likely a good way to solve whatever problem you have. Waiting for a process that's not your child, however, is not the solution. DS
From: Ian Collins on 7 Apr 2010 20:01 On 04/ 8/10 10:45 AM, Sasha wrote: > Is there way on UNIX to wait for particular process (not child > process) identified by pid? I know how to wait for a child process but > is there way to wait for not child process? You can't. The closest you can get would be to poll the process with kill( pid, 0 ); assuming the pid isn't reused too quickly. Why would you want to? -- Ian Collins
From: Sasha on 7 Apr 2010 22:28 On Apr 7, 8:01 pm, Ian Collins <ian-n...(a)hotmail.com> wrote: > On 04/ 8/10 10:45 AM, Sasha wrote: > > > Is there way on UNIX to wait for particular process (not child > > process) identified by pid? I know how to wait for a child process but > > is there way to wait for not child process? > > You can't. > > The closest you can get would be to poll the process with > > kill( pid, 0 ); > > assuming the pid isn't reused too quickly. > > Why would you want to? > > -- > Ian Collins I need to watch a particular already running process until it exists. On Windows I would call OpenPorocess to get the process handle and then use WaitForSingleObject to wait on the handle. I wonder why UNIX does not have something similar?
From: Ian Collins on 7 Apr 2010 23:04
On 04/ 8/10 02:28 PM, Sasha wrote: > On Apr 7, 8:01 pm, Ian Collins<ian-n...(a)hotmail.com> wrote: >> On 04/ 8/10 10:45 AM, Sasha wrote: >> >>> Is there way on UNIX to wait for particular process (not child >>> process) identified by pid? I know how to wait for a child process but >>> is there way to wait for not child process? >> >> You can't. >> >> The closest you can get would be to poll the process with >> >> kill( pid, 0 ); >> >> assuming the pid isn't reused too quickly. >> >> Why would you want to? >> [best not to quote sigs] > > I need to watch a particular already running process until it exists. > On Windows I would call OpenPorocess to get the process handle and > then use WaitForSingleObject to wait on the handle. I wonder why UNIX > does not have something similar? Probably because it's seldom needed. The process that's normally interested in waiting for another to exit is the parent processes. On that basis, you could spawn the process of interest and have to parent signal you when the child completes. What exactly are you trying to achieve? There's probably a better way if you provide some more information. -- Ian Collins |