sigterm

How to detect pending system shutdown on Linux?

由 穿精又带淫゛_ 提交于 2019-11-26 20:35:30
问题 I am working on an application where I need to detect a system shutdown. However, I have not found any reliable way get a notification on this event. I know that on shutdown, my app will receive a SIGTERM signal followed by a SIGKILL . I want to know if there is any way to query if a SIGTERM is part of a shutdown sequence ? Does any one know if there is a way to query that programmatically (C API)? As far as I know, the system does not provide any other method to query for an impending

In what order should I send signals to gracefully shutdown processes?

由 試著忘記壹切 提交于 2019-11-26 17:06:58
In a comment on this answer of another question , the commenter says: don’t use kill -9 unless absolutely necessary! SIGKILL can’t be trapped so the killed program can’t run any shutdown routines to e.g. erase temporary files. First try HUP (1), then INT (2), then QUIT (3) I agree in principle about SIGKILL , but the rest is news to me. Given that the default signal sent by kill is SIGTERM , I would expect it is the most-commonly expected signal for graceful shutdown of an arbitrary process. Also, I have seen SIGHUP used for non-terminating reasons, such as telling a daemon "re-read your

Is it possible to capture a Ctrl+C signal and run a cleanup function, in a “defer” fashion?

由 自古美人都是妖i 提交于 2019-11-26 10:06:40
问题 I want to capture the Ctrl+C ( SIGINT ) signal sent from the console and print out some partial run totals. Is this possible in Golang? Note: When I first posted the question I was confused about Ctrl+C being SIGTERM instead of SIGINT . 回答1: You can use the os/signal package to handle incoming signals. ^C is SIGINT, so you can use this to trap os.Interrupt . c := make(chan os.Signal, 1) signal.Notify(c, os.Interrupt) go func(){ for sig := range c { // sig is a ^C, handle it } }() The manner

How to handle a SIGTERM

由 扶醉桌前 提交于 2019-11-26 09:22:41
问题 Is there a way in Java to handle a received SIGTERM? 回答1: Yes, you can register a shutdown hook with Runtime.addShutdownHook(). 回答2: You could add a shutdown hook to do any cleanup. Like this: public class myjava{ public static void main(String[] args){ Runtime.getRuntime().addShutdownHook(new Thread() { @Override public void run() { System.out.println("Inside Add Shutdown Hook"); } }); System.out.println("Shut Down Hook Attached."); System.out.println(5/0); //Operating system sends SIGFPE to

How to process SIGTERM signal gracefully?

由 人盡茶涼 提交于 2019-11-26 03:23:22
问题 Let\'s assume we have such a trivial daemon written in python: def mainloop(): while True: # 1. do # 2. some # 3. important # 4. job # 5. sleep mainloop() and we daemonize it using start-stop-daemon which by default sends SIGTERM ( TERM ) signal on --stop . Let\'s suppose the current step performed is #2 . And at this very moment we\'re sending TERM signal. What happens is that the execution terminates immediately. I\'ve found that I can handle the signal event using signal.signal(signal

How to process SIGTERM signal gracefully?

由 ぃ、小莉子 提交于 2019-11-26 03:14:28
Let's assume we have such a trivial daemon written in python: def mainloop(): while True: # 1. do # 2. some # 3. important # 4. job # 5. sleep mainloop() and we daemonize it using start-stop-daemon which by default sends SIGTERM ( TERM ) signal on --stop . Let's suppose the current step performed is #2 . And at this very moment we're sending TERM signal. What happens is that the execution terminates immediately. I've found that I can handle the signal event using signal.signal(signal.SIGTERM, handler) but the thing is that it still interrupts the current execution and passes the control to
订阅 sigterm