Re: Forking the polite way

It might be worth taking a look at the source to Proc::Daemon which also follows the general rules of daemon processes described by W. Richard Stevens - That is, this module performs the following:

Forks a child and exits the parent process.

Becomes a session leader (which detaches the program from the controlling terminal).

Forks another child process and exits first child. This prevents the potential of acquiring a controlling terminal.

Changes the current working directory to "/" - The importance of which is outlined by Zaxo above.

Clears the file creation mask.

Closes all open file descriptors (rather than just STDIN, STDOUT and STDERR - Important if these have been redirected or duplicated within the parent process).

perl -e 's&&rob@cowsnet.com.au&&&split/[@.]/&&s&.com.&_&&&print'

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Re: Re: Forking the polite way by rjray (Chaplain) on Feb 13, 2002 at 05:16 UTC
Thanks for the feedback. I've added the `chdir` as suggested. It was already clearing the umask and setting itself as a process group leader with `setpgrp()`. After giving it some thought though, I'm not going to add a use of POSIX because it's just too heavy of a module to saddle someone with. Ditto on closing all files. I am considering having it re-open STDIN, STDOUT and STDERR onto /dev/null, though. --rjray	[reply]

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Re: Re: Forking the polite way
by rjray (Chaplain) on Feb 13, 2002 at 05:16 UTC

Thanks for the feedback. I've added the chdir as suggested. It was already clearing the umask and setting itself as a process group leader with setpgrp(). After giving it some thought though, I'm not going to add a use of POSIX because it's just too heavy of a module to saddle someone with. Ditto on closing all files. I am considering having it re-open STDIN, STDOUT and STDERR onto /dev/null, though.

--rjray

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