Function SigNotifyStack

tars/util/debug/debugtool.go:59–78

SigNotifyStack register os signals to be notified when to dumpstack For example, SigNotifyStack(SIGUSR1, true, "stackinfo"), can dump all goroutine stack when received SIGUSR1 signal by "kill -USR1 pid" sig: self defined os signals, like SIGUSR1 SIGUSR2 in linux and darwin but not supoorted in windo

(sig os.Signal, all bool, logname string)

// all: true means dumping all running goroutine stack, else only dumping the one that calls the func
// logname: prefix of the file's name, which is like logname.20060102-150405
func SigNotifyStack(sig os.Signal, all bool, logname string) {
	buf := make([]byte, 1024)
	c := make(chan os.Signal, 1)
	signal.Notify(c, sig)

	go func() {
		for range c {
			for {
				//the buf is no more than 64M, because Stack dumps no more than 64M
				n := runtime.Stack(buf, all)
				if n < len(buf) {
					buf = buf[:n] //trim unreadable characters
					break
				}
				buf = make([]byte, 2*len(buf))
			}
			write2File(logname, "", buf)
		}
	}()
}