Created
March 28, 2013 17:54
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Proof of concept for deamons
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| package main | |
| import ( | |
| "os" | |
| "log" | |
| "time" | |
| "syscall" | |
| ) | |
| func main() { | |
| tm := 15 | |
| args := os.Args | |
| dir, _ := os.Getwd() | |
| attrs := os.ProcAttr{Dir: dir, Env: os.Environ(), Files: []*os.File{nil, nil, os.Stderr}} | |
| if len(args) == 1 { | |
| log.Printf("First instance; PID: %d\n", os.Getpid()) | |
| args = []string{args[0], "second"} | |
| tm = 10 | |
| } else if args[1] == "second" { | |
| log.Printf("Second instance; PID: %d\n", os.Getpid()) | |
| args = []string{args[0], "third"} | |
| tm = 5 | |
| sysattr := syscall.SysProcAttr{Setsid: true} | |
| attrs.Sys = &sysattr | |
| } else if args[1] == "third" { | |
| log.Printf("Third instance; PID: %d\n", os.Getpid()) | |
| log.Printf("Process %d running for another %d seconds\n", os.Getpid(), tm) | |
| time.Sleep(time.Duration(tm) * 1e9) | |
| log.Printf("Process %d exiting\n", os.Getpid()) | |
| os.Exit(0) | |
| } | |
| proc, err := os.StartProcess("fork2", args, &attrs) | |
| if err != nil { | |
| log.Printf("Unable to start process (my PID: %d)\n", os.Getpid()); | |
| } | |
| proc.Release() | |
| log.Printf("Process %d running for another %d seconds\n", os.Getpid(), tm) | |
| time.Sleep(time.Duration(tm) * 1e9) | |
| log.Printf("Process %d exiting\n", os.Getpid()) | |
| os.Exit(0) | |
| } |
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