Difference between signal, software interrupt and hardware interrupt?

Question

What is the difference between a signal, a software interrupt, and a hardware interrupt? Please tell me with one example?

Answer 1

In C, signals mean a form of internal software communication found in signal.h. You could compare them with “events” or “excrement” in other languages ​​or in the OS. It was an attempt to provide language support for such OS functionality. http://en.wikipedia.org/wiki/Signal.h

A software interrupt refers to specific interruptions in the CPU that were caused by improper software at a low basic level, that is, when an unknown OP code was executed or an attempt was made to access unused memory areas. A software interrupt is caused by the CPU itself, not by the operating system or application.

Hardware interrupts are all other interrupts that are not software interrupts. They are called by the processor itself. Their nature is specific to applications and equipment.

Answer 2

From wikipedia :

In computing, an interrupt is an asynchronous signal indicating the need for attention or a synchronous event in software, indicating the need for a change in execution. The hardware interrupt causes the processor to save its execution state and start executing the interrupt handler. Software interrupts are usually implemented as instructions in a set of instructions that cause context switching to an interrupt handler similar to hardware interrupts.