I’m getting processes left lying around when I do things
like
io = IO.popen(“foo”) # or…
inp, out, err = Open3.popen3(“foobar”)
I’ve tried such things as closing the io object, but to
no avail.
I see no way of retrieving the pid in either case.
What can I do?
Thanks,
Hal
io=IO.popen(“sleep 1000”)
=> #IO:0x40140a8c
io.pid
=> 2676
puts
ps auwx | grep sleep
ital 2676 0.0 0.1 1900 472 pts/0 S 23:58 0:00 sleep 1000
ital 2677 0.0 0.3 2048 872 pts/0 S 23:59 0:00 sh -c
ps auwx | grep sleep
ital 2679 0.0 0.1 1500 432 pts/0 S 23:59 0:00 grep sleep
=> nil
On Wed, 28 Apr 2004 15:52:49 +0900, Hal Fulton hal9000@hypermetrics.com wrote:
I’m getting processes left lying around when I do things
likeio = IO.popen(“foo”) # or…
inp, out, err = Open3.popen3(“foobar”)I’ve tried such things as closing the io object, but to
no avail.I see no way of retrieving the pid in either case.
What can I do?
Thanks,
Hal
Received: Wed, 28 Apr 2004 15:52:49 +0900
And lo, Hal wrote:
I’m getting processes left lying around when I do things
likeio = IO.popen(“foo”) # or…
inp, out, err = Open3.popen3(“foobar”)I’ve tried such things as closing the io object, but to
no avail.I see no way of retrieving the pid in either case.
No need for a pid
Process.wait
Ah, but I just noticed that popen3 doesn’t save the pid info on any of
the IO objects it returns. bug or missing feature?
On Wed, 28 Apr 2004 00:00:31 -0700, Jason Wold jason.wold@gmail.com wrote:
io=IO.popen(“sleep 1000”)
=> #IO:0x40140a8cio.pid
=> 2676puts
ps auwx | grep sleep
ital 2676 0.0 0.1 1900 472 pts/0 S 23:58 0:00 sleep 1000
ital 2677 0.0 0.3 2048 872 pts/0 S 23:59 0:00 sh -c
ps auwx | grep sleep
ital 2679 0.0 0.1 1500 432 pts/0 S 23:59 0:00 grep sleep
=> nilOn Wed, 28 Apr 2004 15:52:49 +0900, Hal Fulton hal9000@hypermetrics.com wrote:
I’m getting processes left lying around when I do things
likeio = IO.popen(“foo”) # or…
inp, out, err = Open3.popen3(“foobar”)I’ve tried such things as closing the io object, but to
no avail.I see no way of retrieving the pid in either case.
What can I do?
Thanks,
Hal
Jason Wold wrote:
io.pid
Thank you. After 2 a.m., my reading skills decline.
Hal
Gregory Millam wrote:
No need for a pid
Process.wait
Hmm, but I don’t want to wait for it. I want to make sure the process
dies. I think io.pid may be the way to go.
Hal
Jason Wold wrote:
Ah, but I just noticed that popen3 doesn’t save the pid info on any of
the IO objects it returns. bug or missing feature?
Well, that would be problematic.
It does seem like a missing feature to me.
Hal
Jason Wold wrote:
Ah, but I just noticed that popen3 doesn’t save the pid info on any of
the IO objects it returns. bug or missing feature?
As it turns out, adding this will fix it:
pi.each do |x|
class << x
attr_accessor :pid
end
x.pid = pid
end
A bit ugly, but I’ll modify my private copy this way until
I see something better…
Hal
Hi,
At Wed, 28 Apr 2004 16:08:58 +0900,
Hal Fulton wrote in [ruby-talk:98616]:
No need for a pid
Process.wait
Hmm, but I don’t want to wait for it. I want to make sure the process
dies. I think io.pid may be the way to go.
You don’t need to wait for IO.popen, popen’ed IO waits the
child process at close. However, popen3 spawns child and
grand-child process which the command is executed as, so you
cannot wait the real command. This restriction is to get rid
of leaving a zombie process.
–
Nobu Nakada
Received: Wed, 28 Apr 2004 16:43:35 +0900
Hi,
At Wed, 28 Apr 2004 16:08:58 +0900,
Hal Fulton wrote in [ruby-talk:98616]:No need for a pid
Process.wait
Hmm, but I don’t want to wait for it. I want to make sure the process
dies. I think io.pid may be the way to go.You don’t need to wait for IO.popen, popen’ed IO waits the
child process at close. However, popen3 spawns child and
grand-child process which the command is executed as, so you
cannot wait the real command. This restriction is to get rid
of leaving a zombie process.
Hmm. … right, I never knew that :D.
irb(main):001:0> f = IO.popen(“fortune”)
=> #IO:0x402be42c
irb(main):002:0> f.read
=> “Do not meddle in the affairs of wizards, for they become soggy and hard to\nlight.\n\nDo not throw cigarette butts in the urinal, for they are subtle and\nquick to anger.\n”
irb(main):003:0> f.close
Thanks, good to know.
And lo, nobu.nokada@softhome.net wrote: