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type	macro	signal
`int` (signals)	`SIGABRT`	(Signal Abort) Abnormal termination, such as is initiated by the `abort` function.
	`SIGFPE`	(Signal Floating-Point Exception) Erroneous arithmetic operation, such as zero divide or an operation resulting in overflow (not necessarily with a floating-point operation).
	`SIGILL`	(Signal Illegal Instruction) Invalid function image, such as an illegal instruction. This is generally due to a corruption in the code or to an attempt to execute data.
	`SIGINT`	(Signal Interrupt) Interactive attention signal. Generally generated by the application user.
	`SIGSEGV`	(Signal Segmentation Violation) Invalid access to storage: When a program tries to read or write outside the memory it has allocated.
	`SIGTERM`	(Signal Terminate) Termination request sent to program.
functions (handlers)	`SIG_DFL`	Default handling: The signal is handled by the default action for that particular signal.
	`SIG_IGN`	Ignore Signal: The signal is ignored.
	`SIG_ERR`	Special return value indicating failure.

<csignal> (signal.h)