abort - cause abnormal program termination
The abort() function causes abnormal program termination
unless the signal SIGABRT is caught and the signal handler
does not return. If the abort() function causes program
termination, all open streams are closed and flushed.
If the SIGABRT signal is blocked or ignored, the abort()
function will still override it.
The abort() function never returns.
SVID 3, POSIX, BSD 4.3, ISO 9899
sigaction(2), exit(3), raise(3)