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HomeBackend DevelopmentGolangWhy Doesn\'t Go\'s cmd.Process.Kill() Work on Child Processes?

Why Doesn't Go's cmd.Process.Kill() Work on Child Processes?

Why Go's cmd.Process.Kill() Fails to Terminate Child Processes

While using cmd.Process.Kill() may seem like a straightforward approach to kill a child process in Go, it has a significant limitation: it doesn't work on child processes. This has been reported in multiple questions, such as "Process.Kill() on child processes."

Solution

To overcome this issue, a more comprehensive approach is required. A solution suggested by the Go community is to utilize the SysProcAttr.Setpgid attribute and the syscall.Kill() function. This approach involves the following steps:

  • Set SysProcAttr.Setpgid to true to create a new process group for the child process.
  • Start the child process using cmd.Start().
  • Obtain the process group ID (pgid) using syscall.Getpgid().
  • Send a SIGTERM signal (signal 15) to the process group using syscall.Kill(-pgid, 15). The negative sign is crucial to target the process group.
  • Finally, call cmd.Wait() to wait for the child process to terminate.

Caveat

It's important to note that this approach may not be cross-platform compatible. While it has been tested on macOS Yosemite and Linux systems, its behavior on BSD and Windows may vary.

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