Hello,
I often use constructions like the following:
os = IO.popen('uname -sr').readlines.to_s.strip
I assume that the Garbage Collector throws away the IO instance created
by IO::popen, because it's simply not needed after that line anymore.
What I've experienced is, that it leaves a zombie for each time I use
such an instruction.
···
---
loop {
zombies = IO.popen('ps ax|grep defunct|wc -l').readlines.to_s.strip
puts "Number of zombies: #{zombies}"
}
---
This code produces about 100 defunct processes in about 2 seconds.
Operating system is FreeBSD 6.1-RC.
However, if I close the IO object manually, defunct processes stay
constantly at 2-3.
---
loop {
io = IO.popen('ps ax|grep defunct|wc -l')
zombies = io.readlines.to_s.strip
io.close
puts "Number of zombies: #{zombies}"
}
---
Is this assumed behaviour or a bug? I guess there's a close(2) or
waitpid(2) missing in the IO code...
Stephan.