56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
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/*
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Copyright 2013 CoreOS Inc.
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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 activation implements primitives for systemd socket activation.
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package activation
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import (
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"os"
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"strconv"
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"syscall"
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)
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// based on: https://gist.github.com/alberts/4640792
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const (
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listenFdsStart = 3
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)
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func Files(unsetEnv bool) []*os.File {
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if unsetEnv {
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// there is no way to unset env in golang os package for now
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// https://code.google.com/p/go/issues/detail?id=6423
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defer os.Setenv("LISTEN_PID", "")
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defer os.Setenv("LISTEN_FDS", "")
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}
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pid, err := strconv.Atoi(os.Getenv("LISTEN_PID"))
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if err != nil || pid != os.Getpid() {
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return nil
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}
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nfds, err := strconv.Atoi(os.Getenv("LISTEN_FDS"))
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if err != nil || nfds == 0 {
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return nil
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}
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var files []*os.File
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for fd := listenFdsStart; fd < listenFdsStart+nfds; fd++ {
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syscall.CloseOnExec(fd)
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files = append(files, os.NewFile(uintptr(fd), "LISTEN_FD_"+strconv.Itoa(fd)))
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}
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return files
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}
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