pystdlib

signal.SIG_DFL   signal.SIGBUS    signal.SIGFPE    signal.SIGIO     signal.SIGPOLL   signal.SIGRTMAX  signal.SIGSYS    signal.SIGTTIN   signal.SIGUSR2   signal.SIGXFSZ   
signal.SIG_IGN   signal.SIGCHLD   signal.SIGHUP    signal.SIGIOT    signal.SIGPROF   signal.SIGRTMIN  signal.SIGTERM   signal.SIGTTOU   signal.SIGVTALRM                  
signal.SIGABRT   signal.SIGCLD    signal.SIGILL    signal.SIGKILL   signal.SIGPWR    signal.SIGSEGV   signal.SIGTRAP   signal.SIGURG    signal.SIGWINCH                   
signal.SIGALRM   signal.SIGCONT   signal.SIGINT    signal.SIGPIPE   signal.SIGQUIT   signal.SIGSTOP   signal.SIGTSTP   signal.SIGUSR1   signal.SIGXCPU

为指定的信号, 设置自定义的处理函数.

import signal
# Define signal handler function
def myHandler(signum, frame):
    print('I received: ', signum)

# register signal.SIGTSTP's handler 
signal.signal(signal.SIGTSTP, myHandler)
signal.pause()
print('End of Signal Demo')

# 效果 : 当执行该脚本时, 脚本自身阻塞; 当向脚本发送 SIGTSTP 信号时, 脚本执行 myHandler 函数, 并继续执行之后的 print 语句.

当运行到此处时, 进程暂停并等待信号. 代码如上示例.

被用于在一定时间之后, 向进程自身发送 SIGALRM 信号.

import signal
# Define signal handler function
def myHandler(signum, frame):
    print("Now, it's the time")
    exit()

# register signal.SIGALRM's handler 
signal.signal(signal.SIGALRM, myHandler)
signal.alarm(5)
while True:
    print('not yet')

# 效果 : 脚本无条件循环 打印语句, 在执行 5 秒之后, signal.alarm() 向自身发送 SIGALRM 信号, 执行 myHandler 函数.