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main.go
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67 lines (56 loc) · 1.45 KB
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package main
import (
"flag"
"fmt"
"os"
"os/signal"
"syscall"
"time"
"github.com/alexcoder04/friendly/v2"
)
const SIGRTMIN = 34
var (
flagSigNum = flag.Int("signal", 1, "signal to listen on")
flagInterval = flag.Int("interval", 0, "run command every so much seconds")
)
func ListenFor(signalNumber int, cmd []string) {
if signalNumber == 0 {
fmt.Println("signal number is 0, not listening")
return
}
channel := make(chan os.Signal, 1)
signal.Notify(channel, syscall.Signal(SIGRTMIN+signalNumber))
fmt.Printf("waiting for signal SIGRTMIN+%d to execute %s...\n", signalNumber, cmd[0])
<-channel
fmt.Printf("got signal, executing %s:\n", cmd[0])
friendly.Run(cmd, "")
ListenFor(signalNumber, cmd)
}
func ListenToQuit(signalNumber int) {
channel := make(chan os.Signal, 1)
signal.Notify(channel, syscall.Signal(signalNumber))
<-channel
fmt.Printf("caugth signal %d, exiting\n", signalNumber)
os.Exit(0)
}
func main() {
flag.Parse()
for _, s := range []int{1, 2, 3, 15} {
go ListenToQuit(s)
}
cmd := flag.CommandLine.Args()
if len(cmd) == 0 {
cmd = []string{"echo", "hello kangaroo"}
}
if *flagInterval == 0 {
ListenFor(*flagSigNum, cmd)
return
}
go ListenFor(*flagSigNum, cmd)
fmt.Printf("executing %s in interval of %d seconds...\n", cmd, *flagInterval)
for {
time.Sleep(time.Duration(*flagInterval) * 1000000000)
fmt.Printf("interval of %d seconds passed, executing %s:\n", *flagInterval, cmd)
friendly.Run(cmd, "")
}
}