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net: ListenMulticastUDP to listen concurrently across multiple listeners

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This CL introduces new function ListenMulticastUDP to fix
multicast UDP listening across multiple listeners issue,
to replace old multicast methods JoinGroup and LeaveGroup
on UDPConn.

This CL also enables multicast testing by default.

Fixes #2730.

R=rsc, paul.a.lalonde, fullung, devon.odell
CC=golang-dev
https://golang.org/cl/5562048
This commit is contained in:
Mikio Hara 2012-02-01 01:53:26 +09:00
parent c86e03975c
commit 2f63afdc7a
12 changed files with 260 additions and 119 deletions
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26
src/pkg/net/sockopt_linux.go
View file

@ -7,31 +7,43 @@
package net
import (
"os"
"syscall"
)
func setDefaultSockopts(s, f, t int) {
func setDefaultSockopts(s, f, t int) error {
switch f {
case syscall.AF_INET6:
// Allow both IP versions even if the OS default is otherwise.
// Note that some operating systems never admit this option.
syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, 0)
}
if f == syscall.AF_UNIX ||
(f == syscall.AF_INET || f == syscall.AF_INET6) && t == syscall.SOCK_STREAM {
// Allow reuse of recently-used addresses.
syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
}
// Allow broadcast.
syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
return nil
}
func setDefaultMulticastSockopts(fd *netFD) {
fd.incref()
defer fd.decref()
func setDefaultMulticastSockopts(s int) error {
// Allow multicast UDP and raw IP datagram sockets to listen
// concurrently across multiple listeners.
syscall.SetsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
return nil
}