43 lines
1.6 KiB
Go
43 lines
1.6 KiB
Go
// Copyright 2016-2018, Pulumi Corporation.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !windows
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// +build !windows
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package cmdutil
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import (
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"os/exec"
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"syscall"
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)
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// KillChildren calls os.Process.Kill() on every child process of `pid`'s, stoping after the first error (if any). It
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// also only kills direct child process, not any children they may have.
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func KillChildren(pid int) error {
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// A subprocess that was launched after calling `RegisterProcessGroup` below will
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// belong to a process group whose ID is the same as the PID. Passing the negation
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// of our PID (same as the PGID) sends a SIGKILL to all processes in our group.
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//
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// Relevant documentation: https://linux.die.net/man/2/kill
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// "If pid is less than -1, then sig is sent to every process in the
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// process group whose ID is -pid. "
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return syscall.Kill(-pid, syscall.SIGKILL)
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}
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// RegisterProcessGroup informs the OS that it needs to call `setpgid` on this
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// child process. When it comes time to kill this process, we'll kill all processes
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// in the same process group.
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func RegisterProcessGroup(cmd *exec.Cmd) {
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cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
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}
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