UNIX: system signals.

---

SIGHUP	01	hangup
SIGINT	02	interrupt
SIGQUIT	03[1]	quit
SIGILL	04[1]	illegal instruction (not reset when caught)
SIGTRAP	05[1][5]	trace trap (not reset when caught)
SIGABRT	06[1]	abort
SIGEMT	07[1][4]	EMT instruction
SIGFPE	08[1]	floating point exception
SIGKILL	09	kill (cannot be caught or ignored)
SIGBUS	10[1]	bus error
SIGSEGV	11[1]	segmentation violation
SIGSYS	12[1]	bad argument to system call
SIGPIPE	13	write on a pipe with no one to read it
SIGALRM	14	alarm clock
SIGTERM	15	software termination signal
SIGUSR1	16	user-defined signal 1
SIGUSR2	17	user-defined signal 2
SIGCLD	18[2]	death of a child
SIGPWR	19[2]	power fail (not reset when caught)
SIGSTOP	20[6]	stop (cannot be caught or ignored)
SIGTSTP	21[6]	stop signal generated from keyboard
SIGPOLL	22[3]	selectable event pending
SIGIO	23[2]	input/output possible
SIGURG	24[2]	urgent condition on O channel
SIGWINCH	25[2]	window size changes
SIGVTALRM	26	virtual time alarm
SIGPROF	27	profiling alarm
SIGCONT	28[6]	continue after stop (cannot be ignored)
SIGTTIN	29[6]	background read from control terminal
SIGTTOU	30[6]	background write to control terminal
SIGXCPU	31	cpu time limit exceeded [see setrlimit(2)]
SIGXFSZ	32	file size limit exceeded [see setrlimit(2)]

---