If there is more than one way, please list them. I only know of one, but I'm wondering if there is a cleaner, in-Ruby way.
9 Answers
If it's a process you expect to "own" (e.g. you're using this to validate a pid for a process you control), you can just send sig 0 to it.
>> Process.kill 0, 370
=> 1
>> Process.kill 0, 2
Errno::ESRCH: No such process
from (irb):5:in `kill'
from (irb):5
>>
@John T, @Dustin: Actually, guys, I perused the Process rdocs, and it looks like
Process.getpgid( pid )
is a less violent means of applying the same technique.
You can try using
Process::kill 0, pid
where pid is the pid number, if the pid is running it should return 1.
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