util: Move socketset from net resource to util

Prepare the socketset api to be used outside of the scope the net
resource.

util/socketset/socketset_test.go

@@ -0,0 +1,106 @@
+// Mgmt
+// Copyright (C) 2013-2018+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package socketset
+
+import (
+	"testing"
+
+	"golang.org/x/sys/unix"
+)
+
+// test cases for socketSet.fdSet()
+var fdSetTests = []struct {
+	in  *SocketSet
+	out *unix.FdSet
+}{
+	{
+		&SocketSet{
+			fdEvents: 3,
+			fdPipe:   4,
+		},
+		&unix.FdSet{
+			Bits: [16]int64{0x18}, // 11000
+		},
+	},
+	{
+		&SocketSet{
+			fdEvents: 12,
+			fdPipe:   8,
+		},
+		&unix.FdSet{
+			Bits: [16]int64{0x1100}, // 1000100000000
+		},
+	},
+	{
+		&SocketSet{
+			fdEvents: 9,
+			fdPipe:   21,
+		},
+		&unix.FdSet{
+			Bits: [16]int64{0x200200}, // 1000000000001000000000
+		},
+	},
+}
+
+// test socketSet.fdSet()
+func TestFdSet(t *testing.T) {
+	for _, test := range fdSetTests {
+		result := test.in.fdSet()
+		if *result != *test.out {
+			t.Errorf("fdSet test wanted: %b, got: %b", *test.out, *result)
+		}
+	}
+}
+
+// test cases for socketSet.nfd()
+var nfdTests = []struct {
+	in  *SocketSet
+	out int
+}{
+	{
+		&SocketSet{
+			fdEvents: 3,
+			fdPipe:   4,
+		},
+		5,
+	},
+	{
+		&SocketSet{
+			fdEvents: 8,
+			fdPipe:   4,
+		},
+		9,
+	},
+	{
+		&SocketSet{
+			fdEvents: 90,
+			fdPipe:   900,
+		},
+		901,
+	},
+}
+
+// test socketSet.nfd()
+func TestNfd(t *testing.T) {
+	for _, test := range nfdTests {
+		result := test.in.nfd()
+		if result != test.out {
+			t.Errorf("nfd test wanted: %d, got: %d", test.out, result)
+		}
+	}
+}