1 files changed, 141 insertions, 0 deletions
diff --git a/src/net/sockopt_posix.go b/src/net/sockopt_posix.go
new file mode 100644
index 000000000..1654d1b85
--- /dev/null
+++ b/src/net/sockopt_posix.go
@@ -0,0 +1,141 @@
+// Copyright 2009 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin dragonfly freebsd linux netbsd openbsd solaris windows
+
+package net
+
+import (
+	"os"
+	"syscall"
+)
+
+// Boolean to int.
+func boolint(b bool) int {
+	if b {
+		return 1
+	}
+	return 0
+}
+
+func ipv4AddrToInterface(ip IP) (*Interface, error) {
+	ift, err := Interfaces()
+	if err != nil {
+		return nil, err
+	}
+	for _, ifi := range ift {
+		ifat, err := ifi.Addrs()
+		if err != nil {
+			return nil, err
+		}
+		for _, ifa := range ifat {
+			switch v := ifa.(type) {
+			case *IPAddr:
+				if ip.Equal(v.IP) {
+					return &ifi, nil
+				}
+			case *IPNet:
+				if ip.Equal(v.IP) {
+					return &ifi, nil
+				}
+			}
+		}
+	}
+	if ip.Equal(IPv4zero) {
+		return nil, nil
+	}
+	return nil, errNoSuchInterface
+}
+
+func interfaceToIPv4Addr(ifi *Interface) (IP, error) {
+	if ifi == nil {
+		return IPv4zero, nil
+	}
+	ifat, err := ifi.Addrs()
+	if err != nil {
+		return nil, err
+	}
+	for _, ifa := range ifat {
+		switch v := ifa.(type) {
+		case *IPAddr:
+			if v.IP.To4() != nil {
+				return v.IP, nil
+			}
+		case *IPNet:
+			if v.IP.To4() != nil {
+				return v.IP, nil
+			}
+		}
+	}
+	return nil, errNoSuchInterface
+}
+
+func setIPv4MreqToInterface(mreq *syscall.IPMreq, ifi *Interface) error {
+	if ifi == nil {
+		return nil
+	}
+	ifat, err := ifi.Addrs()
+	if err != nil {
+		return err
+	}
+	for _, ifa := range ifat {
+		switch v := ifa.(type) {
+		case *IPAddr:
+			if a := v.IP.To4(); a != nil {
+				copy(mreq.Interface[:], a)
+				goto done
+			}
+		case *IPNet:
+			if a := v.IP.To4(); a != nil {
+				copy(mreq.Interface[:], a)
+				goto done
+			}
+		}
+	}
+done:
+	if bytesEqual(mreq.Multiaddr[:], IPv4zero.To4()) {
+		return errNoSuchMulticastInterface
+	}
+	return nil
+}
+
+func setReadBuffer(fd *netFD, bytes int) error {
+	if err := fd.incref(); err != nil {
+		return err
+	}
+	defer fd.decref()
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_RCVBUF, bytes))
+}
+
+func setWriteBuffer(fd *netFD, bytes int) error {
+	if err := fd.incref(); err != nil {
+		return err
+	}
+	defer fd.decref()
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_SNDBUF, bytes))
+}
+
+func setKeepAlive(fd *netFD, keepalive bool) error {
+	if err := fd.incref(); err != nil {
+		return err
+	}
+	defer fd.decref()
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_KEEPALIVE, boolint(keepalive)))
+}
+
+func setLinger(fd *netFD, sec int) error {
+	var l syscall.Linger
+	if sec >= 0 {
+		l.Onoff = 1
+		l.Linger = int32(sec)
+	} else {
+		l.Onoff = 0
+		l.Linger = 0
+	}
+	if err := fd.incref(); err != nil {
+		return err
+	}
+	defer fd.decref()
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptLinger(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_LINGER, &l))
+}