/
sleepservice.go
62 lines (47 loc) · 1.42 KB
/
sleepservice.go
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package main
import (
"time"
"log"
"flag"
"math/rand"
"os"
"os/signal"
"syscall"
)
func main() {
// load command line arguments
name := flag.String("name","world","name to print")
flag.Parse()
log.Printf("Starting sleepservice for %s",*name)
// setup signal catching
sigs := make(chan os.Signal, 1)
// catch all signals since not explicitly listing
signal.Notify(sigs)
//signal.Notify(sigs,syscall.SIGQUIT)
// method invoked upon seeing signal
go func() {
for sig := range sigs {
log.Printf("RECEIVED SIGNAL: %s",sig)
switch sig {
// starting with golang 1.14, need to ignore SIGURG used for preemption
// https://github.com/golang/go/issues/37942
case syscall.SIGURG:
log.Printf("ignoring sigurg")
default:
AppCleanup()
os.Exit(1)
} // switch
} // for
}()
// infinite print loop
for {
log.Printf("hello %s",*name)
// wait random number of milliseconds
Nsecs := rand.Intn(3000)
log.Printf("About to sleep %dms before looping again",Nsecs)
time.Sleep(time.Millisecond * time.Duration(Nsecs))
}
}
func AppCleanup() {
log.Println("CLEANUP APP BEFORE EXIT!!!")
}