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 15 package activation 16 17 import ( 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} 27 func PacketConns() ([]net.PacketConn, error) { 28 files := Files(true) 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 f.Close() 35 } 36 } 37 return conns, nil 38 } 39