pcntl_signal(): Error assigning signal

Question

Why happend this error:

Warning: pcntl_signal(): Error assigning signal in ...

In php5 in CLI, the line is:

pcntl_signal(9,"signalHandlerTemp", false);

I try with SIGKILL and true and nothing!

Answer 1

SIGNAL 9 is the Kill signal, and you can't catch him

See http://en.wikipedia.org/wiki/SIGKILL#usage