diff options
Diffstat (limited to 'src/sd_daemon/notify.go')
-rw-r--r-- | src/sd_daemon/notify.go | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/sd_daemon/notify.go b/src/sd_daemon/notify.go new file mode 100644 index 0000000..a038f54 --- /dev/null +++ b/src/sd_daemon/notify.go @@ -0,0 +1,52 @@ +// Copyright 2013-2015 Docker, Inc. +// Copyright 2014 CoreOS, Inc. +// Copyright 2015 Luke Shumaker +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package sd_daemon + +import ( + "errors" + "net" + "os" +) + +// ErrNotifyNoSocket is an error returned if no socket was specified. +var ErrNotifyNoSocket = errors.New("No socket") + +// Notify sends a message to the init daemon. It is common to ignore +// the error. +func Notify(unsetEnv bool, state string) error { + if unsetEnv { + defer os.Unsetenv("NOTIFY_SOCKET") + } + + socketAddr := &net.UnixAddr{ + Name: os.Getenv("NOTIFY_SOCKET"), + Net: "unixgram", + } + + if socketAddr.Name == "" { + return ErrNotifyNoSocket + } + + conn, err := net.DialUnix(socketAddr.Net, nil, socketAddr) + if err != nil { + return err + } + defer conn.Close() + + _, err = conn.Write([]byte(state)) + return err +} |