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Perl: the Markov chain saw

Re: Monitoring child processes

by cdarke (Prior)
on Mar 13, 2012 at 15:40 UTC ( #959381=note: print w/replies, xml ) Need Help??

in reply to Monitoring child processes

In addition to moritz's comment about waitpid: SIGCHLD is handled differently to other signals on most UNIX's, in that it does not by default kill the process it signals.
On Linux, check man 7 signal for more information. It is possible that Solaris handles them differently, so it would be wise to look at the equivalent man pages there as well.

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Re^2: Monitoring child processes
by rovf (Priest) on Mar 13, 2012 at 15:54 UTC
    SIGCHLD is handled differently to other signals on most UNIX's, in that it does not by default kill the process it signals.
    Correct, and at least on Linux (the Solaris docs are not precise about this), the default for SIGCHLD seems to be "ignore". That's why I was so puzzled, that in my Perl program I had to explicitly set it to IGNORE to get things working...

    Ronald Fischer <>
      There is a low level data structure called sigaction. Without diving into the Perl guts, I really don't know what Perl does to this structure. But apparently it does something different than just not writing to it at all - I presume whatever Perl does is an attempt at multi-platform operation that on your particular platform does something that you didn't expect.

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[james28909]: omg
[james28909]: im just finding out that july and august have 31 days?
[atcroft]: stevieb: Apparently it was contagious....
[atcroft]: james28909: Make both hands into fists, place them together (with thumbs concealed), and every knuckle is a month (starting with Jan.) has 31 days, every dip (between knuckles) does not....
[atcroft]: (And Feb. is the odd case, because it is 28, unless it is a year divisible by 4, or if it is divisible by both 100 and 400 (at which point it is 29).)
[james28909]: i know but scroll through your calendar on your computer.
[james28909]: i thiught you were going to say make both hands into a fist and puch yourself in the face
[atcroft]: .oO(Sorry, I probably should have said take two normal hands....)
[atcroft]: james28909: No, unless you are a politician, I wouldn't say that (and even if you are, I still probably wouldn't say that).
[james28909]: i mean how hard can it be? its just subtracting days lol

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