signal Constants 

The sig argument must be one of the manifest constants listed below (defined in SIGNAL.H).

SIGABRT

Abnormal termination. The default action terminates the calling program with exit code 3.

SIGABRT_COMPAT

Same as SIGABRT. For compatibility with other platforms.

SIGFPE

Floating-point error, such as overflow, division by zero, or invalid operation. The default action terminates the calling program.

SIGILL

Illegal instruction. The default action terminates the calling program.

SIGINT

CTRL+C interrupt. The default action terminates the calling program with exit code 3.

SIGSEGV

Illegal storage access. The default action terminates the calling program.

SIGTERM

Termination request sent to the program. The default action terminates the calling program with exit code 3.

SIG_ERR

A return type from a signal indicating an error has occurred.

Reference