Summary of signals

This table describes what each signal means.

Signal	Description
SIGABRT	Abnormal termination signal such as issued by the abort() function.
SIGALRM	Timeout signal such as issued by the alarm() function.
SIGBUS	Indicates a memory parity error (QNX-specific interpretation). Note that if a second fault occurs while your process is in a signal handler for this fault, the process will be terminated.
SIGCHLD (or SIGCLD)	Child process terminated. The default action is to ignore the signal.
SIGCONT	Continue if HELD. The default action is to ignore the signal if the process isn't HELD.
SIGDEADLK	Mutex deadlock occurred. If you haven't called SyncMutexEvent(), and if the conditions that would cause the kernel to deliver the event occur, then the kernel delivers a SIGDEADLK instead.
SIGEMT	EMT instruction (emulator trap).
SIGFPE	Erroneous arithmetic operation (integer or floating point), such as division by zero or an operation resulting in overflow. Note that if a second fault occurs while your process is in a signal handler for this fault, the process will be terminated.
SIGHUP	Death of session leader, or hangup detected on controlling terminal.
SIGILL	Detection of an invalid hardware instruction. Note that if a second fault occurs while your process is in a signal handler for this fault, the process will be terminated. One possible cause for this signal is trying to perform an operation that requires I/O privileges. A thread can request these privileges by: Enabling the PROCMGR_AID_IO ability enabled. For more information, see procmgr_ability(). Calling ThreadCtl(), specifying the _NTO_TCTL_IO flag: ThreadCtl( _NTO_TCTL_IO, 0 );
SIGINT	Interactive attention signal (Break).
SIGIOT	IOT instruction (not generated on x86 hardware).
SIGKILL	Termination signal—should be used only for emergency situations. This signal can't be caught or ignored.
SIGPIPE	Attempt to write on a pipe with no readers.
SIGPOLL (or SIGIO)	Pollable event occurred.
SIGPWR	Power failure or restart.
SIGQUIT	Interactive termination signal.
SIGSEGV	Detection of an invalid memory reference. Note that if a second fault occurs while your process is in a signal handler for this fault, the process will be terminated.
SIGSTOP	Stop process (the default). This signal cannot be caught or ignored.
SIGSYS	Bad argument to system call.
SIGTERM	Termination signal.
SIGTRAP	Unsupported software interrupt.
SIGTSTP	Stop signal generated from keyboard.
SIGTTIN	Background read attempted from control terminal.
SIGTTOU	Background write attempted to control terminal.
SIGURG	Urgent condition present on socket.
SIGUSR1	Reserved as application-defined signal 1.
SIGUSR2	Reserved as application-defined signal 2.
SIGWINCH	Window size changed.