I guess killing the program closes the file-handle and flushes the buffer.

Yes, but you can flush without closing the file or terminating the program: 

use IO::Handle;
... open LOG ...
LOG->autoflush();

# or flush manually as needed:
...
LOG->flush();

[download]

(Note that $| = 1 applies to the currently selected handle, which is not LOG, unless you explicitly select it (by default it's STDOUT).)

In reply to Re: Proc::Daemon logging issue - log only populates on daemon exit by Anonyrnous Monk
in thread Proc::Daemon logging issue - log only populates on daemon exit by tizatron

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