1// Copyright 2015 CoreOS, Inc. 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15package activation 16 17import ( 18 "net" 19) 20 21// PacketConns returns a slice containing a net.PacketConn for each matching socket type 22// passed to this process. 23// 24// The order of the file descriptors is preserved in the returned slice. 25// Nil values are used to fill any gaps. For example if systemd were to return file descriptors 26// corresponding with "udp, tcp, udp", then the slice would contain {net.PacketConn, nil, net.PacketConn} 27func PacketConns(unsetEnv bool) ([]net.PacketConn, error) { 28 files := Files(unsetEnv) 29 conns := make([]net.PacketConn, len(files)) 30 31 for i, f := range files { 32 if pc, err := net.FilePacketConn(f); err == nil { 33 conns[i] = pc 34 } 35 } 36 return conns, nil 37} 38