Is it possible to ignore the SIGKILL signal in a program, and what could be the consequences?

The SIGKILL signal (usually number 9) is a signal that immediately terminates a process by the operating system. It cannot be caught, handled, or ignored by a program.

Therefore, handling SIGKILL is fundamentally impossible. If a process receives SIGKILL, it terminates immediately without the opportunity to perform any cleanup or save state.

Consequences:

• The program cannot properly release resources (files, memory, locks).
• It may lead to data loss or file corruption.
• In systems with critical services, it can cause instability.

To properly terminate a program, signals like SIGTERM or SIGINT are usually used, which can be handled to perform necessary actions before exiting.