70 lines
1.5 KiB
Go
70 lines
1.5 KiB
Go
// +build !windows
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/*
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Copyright The containerd Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package sys
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import (
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"golang.org/x/sys/unix"
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)
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// Exit is the wait4 information from an exited process
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type Exit struct {
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Pid int
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Status int
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}
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// Reap reaps all child processes for the calling process and returns their
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// exit information
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func Reap(wait bool) (exits []Exit, err error) {
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var (
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ws unix.WaitStatus
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rus unix.Rusage
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)
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flag := unix.WNOHANG
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if wait {
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flag = 0
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}
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for {
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pid, err := unix.Wait4(-1, &ws, flag, &rus)
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if err != nil {
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if err == unix.ECHILD {
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return exits, nil
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}
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return exits, err
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}
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if pid <= 0 {
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return exits, nil
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}
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exits = append(exits, Exit{
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Pid: pid,
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Status: exitStatus(ws),
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})
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}
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}
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const exitSignalOffset = 128
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// exitStatus returns the correct exit status for a process based on if it
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// was signaled or exited cleanly
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func exitStatus(status unix.WaitStatus) int {
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if status.Signaled() {
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return exitSignalOffset + int(status.Signal())
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}
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return status.ExitStatus()
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}
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