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Re^3: Fork exec and not wait?

by kennethk (Abbot)
on Jan 24, 2013 at 20:06 UTC ( #1015226=note: print w/replies, xml ) Need Help??


in reply to Re^2: Fork exec and not wait?
in thread Fork exec and not wait?

Is there anyway to either fork a process and force its output to /dev/null or simply make the parent ignore the child and continue?

You can literally accomplish this task by redirecting your STDOUT and STDERR to /dev/null using open in the child after your fork:

open STDOUT, '>', '/dev/null' or die "Redirect failed: $!"; open STDERR, '>', '/dev/null' or die "Redirect failed: $!";

You'd probably combine this in an instruction to not bother waiting to reap the child (see perlipc):

$SIG{CHLD} = "IGNORE";

However, you are treating a symptom here.As eyepopslikeamosquito says, this sounds like an XY Problem. I suspect your dissection of the system is incorrect, and what's actually happening is your child is hanging on STDIN that's not coming. Post code so we can actually diagnose this and fix it.


#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

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[marioroy]: The MCE::Hobo::Pool module will come later.
[Corion]: marioroy: Oh, that's always cool, having API-compatible modules. This makes testing and comparing things much easier
[marioroy]: IPC in MCE::Shared can handle 400k (sends) per second. That's seems a lot for being a pure-Perl module. After making the release, will come back and post a solution for a node by a fellow wanting faster logging.
[Corion]: While working on WWW::Mechanize:: Chrome, I had the suspicion that AnyEvent was doing something wrong, but I was able to swap it out for Mojolicious and the error persisted.
[Corion]: Of course, the error was in my own code ;)

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