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[Octave-bug-tracker] [bug #37591] system with async option results in zo
From: |
Mike Miller |
Subject: |
[Octave-bug-tracker] [bug #37591] system with async option results in zombie processes |
Date: |
Fri, 22 Sep 2017 02:53:27 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0 |
Follow-up Comment #8, bug #37591 (project octave):
Yes, there is nothing you can do in the child to influence this behavior, it
has to be done by Octave.
If you are calling system directly, you can reap these defunct processes with
>> pid = system ("ls", [] "async")
pid = 16256
>> system ps;
PID TTY TIME CMD
16235 pts/0 00:00:00 octave-cli-4.3.
16256 pts/0 00:00:00 sh <defunct>
16259 pts/0 00:00:00 sh
16260 pts/0 00:00:00 ps
29689 pts/0 00:00:00 bash
>> waitpid (pid);
>> system ps;
PID TTY TIME CMD
16235 pts/0 00:00:01 octave-cli-4.3.
16307 pts/0 00:00:00 sh
16308 pts/0 00:00:00 ps
29689 pts/0 00:00:00 bash
I think this leads to the decision point of this problem, should system(...,
"async") automatically reap all child processes automatically behind the
scenes? Or should it be the responsibility of the caller, at the interpreter
level, to call waitpid(pid) for every invocation of system(..., "async")?
It can't be done both ways. If Octave is in charge of reaping these defunct
processes, then the caller will never have access to the exit status, etc,
they will be truly async with no information available about whether they ever
ran or are still running.
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- [Octave-bug-tracker] [bug #37591] system with async option results in zombie processes, Dan Sebald, 2017/09/22
- [Octave-bug-tracker] [bug #37591] system with async option results in zombie processes, Mike Miller, 2017/09/22
- [Octave-bug-tracker] [bug #37591] system with async option results in zombie processes, Dan Sebald, 2017/09/22
- [Octave-bug-tracker] [bug #37591] system with async option results in zombie processes, Dan Sebald, 2017/09/22
- [Octave-bug-tracker] [bug #37591] system with async option results in zombie processes,
Mike Miller <=
- [Octave-bug-tracker] [bug #37591] system with async option results in zombie processes, anonymous, 2017/09/22
- [Octave-bug-tracker] [bug #37591] system with async option results in zombie processes, Dan Sebald, 2017/09/22
- [Octave-bug-tracker] [bug #37591] system with async option results in zombie processes, Mike Miller, 2017/09/22
- [Octave-bug-tracker] [bug #37591] system with async option results in zombie processes, Rik, 2017/09/22
- [Octave-bug-tracker] [bug #37591] system with async option results in zombie processes, Dan Sebald, 2017/09/22