Signal Name Signal Number Description
SIGHUP 1 Hang up detected on controlling terminal or death of controlling process
SIGINT 2 Issued if the user sends an interrupt signal (Ctrl + C)
SIGQUIT 3 Issued if the user sends a quit signal (Ctrl + D)
SIGFPE 8 Issued if an illegal mathematical operation is attempted
SIGKILL 9 If a process gets this signal it must quit immediately and will not perform any clean-up operations
SIGALRM 14 Alarm clock signal (used for timers)
SIGTERM 15 Software termination signal (sent by kill by default)