Python Signal Volume

The concept of a signal

Signal (signal)--the way communication between processes is a software interrupt. Once a process receives a signal, it interrupts the original program execution process to process the signal.

Several common signals:

SIGINT terminating process interrupt process (CONTROL+C)

Sigquit Exit Process

SIGTERM terminating process software termination signal (default signal)

SIGKILL Terminate process Kill process

SIGALRM Alarm Clock signal

For example, to do some processing when you press CONTROL+C to terminate the process, the code is as follows:

Import Signal

def fun (SIG, Stack_frame):
print ' Eixt%d,%s '% (sig,stack_frame)
Exit (1)

Signal.signal (signal. SIGINT, Fun)

Signal.signal (signal. SIGINT, fun) The processing function used to register the semaphore,

The first parameter is the semaphore, the second argument can pass a function,

This function defaults to two parameters, the first parameter sig represents the received semaphore, and the second stack_frame can be understood as the call stack that produces the interrupt semaphore sig.

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