What is default signal handler?

Signals are software interrupts which sent to a program to indicate that an important event has occurred. A Signal may be handled by following one of two possible handlers:

• A default signal handler
• A user-defined signal handler

A Default signal handler is associated with every signal that the kernel runs when handling that signal. The action that a script or program performs when it receives a signal is called the default actions. A default signal handler handles these types of different default actions.

Some of the possible default actions are −

• Terminate the process.

• Ignore the signal.

• Dump core. It creates a file called core containing the memory image of the process when it received the signal.

• Stop the process.

• Continue a stopped process.