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