I am looking for a document explains all the signals' meaning and trigger.

The signals special to Perl, like __WARN__ and __DIE__, are documented in %SIG, the other signals are generally POSIX signals, which you can read about for example in signal(7) like here and here, or in Signal (IPC). Note that a lot of signals may be OS-specific. If you could tell us what you want to use them for (and on which platforms), perhaps we can give more specific advice.

In reply to Re^3: Any reference about %SIG by haukex
in thread Any reference about %SIG by exilepanda

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