Created
November 3, 2020 12:19
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golang: exec 时继承父级进程数据
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| package main | |
| import ( | |
| "fmt" | |
| "golang.org/x/sys/unix" | |
| "os" | |
| "os/exec" | |
| "syscall" | |
| ) | |
| var isRerun = make(map[string]int) | |
| func Self() string { | |
| return "/proc/self/exe" | |
| } | |
| func Command(args ...string) *exec.Cmd { | |
| return &exec.Cmd{ | |
| Path: Self(), | |
| Args: args, | |
| SysProcAttr: &syscall.SysProcAttr{ | |
| Pdeathsig: unix.SIGTERM, | |
| }, | |
| } | |
| } | |
| func main() { | |
| // 注册 | |
| if _, exists := isRerun["flag"]; !exists { | |
| isRerun["flag"] = 1 | |
| } | |
| // 当前的名称不叫 flag 所以是 exists=false | |
| fmt.Println("获取当前的flag", os.Args[0]) | |
| _, exists := isRerun[os.Args[0]] | |
| if exists { | |
| fmt.Printf("sec run: %s: pid is %d\n", os.Args[0], os.Getpid()) | |
| fmt.Println("goodbye") | |
| os.Exit(0) | |
| } else { | |
| fmt.Printf("first run: %s: pid is %d\n", os.Args[0], os.Getpid()) | |
| } | |
| cmd := Command("flag") | |
| cmd.Stdout = os.Stdout | |
| cmd.Stderr = os.Stderr | |
| cmd.Run() | |
| } |
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