public SignalHandlerFunc @signal (ProcessSignal signum, SignalHandlerFunc handler)
Sets the error handler for signal sig.
The signal handler can be set so that default handling will occur, signal is ignored, or an user-defined function is called.
When signal handler is set to a function and a signal occurs, it is implementation defined whether @signal (sig, SIG_DFL) will be executed immediately before the start of signal handler. Also, the implementation can prevent some implementation-defined set af signals from occurring while the signal handler runs.
If the signal handler is called as a result of abort or raise, the behavior is undefined if any of the following requirements is not followed:
- the signal handler calls raise.
- the signal handler refers to an object of static storage duration which is not declared
as volatile sig_atomic_t.
- the signal handler calls any function within the standard library, except abort,
_Exit, or @signal with the first argument not being the number of the
signal currently handled.