net: Added function SetTimeout() to interface Listener.

Fixes #2148.

R=golang-dev, bradfitz, rsc
CC=golang-dev
https://golang.org/cl/4905042

src/pkg/net/fd.go

@@ -585,6 +585,11 @@ func (fd *netFD) accept(toAddr func(syscall.Sockaddr) Addr) (nfd *netFD, err os.
 
 	fd.incref()
 	defer fd.decref()
+	if fd.rdeadline_delta > 0 {
+		fd.rdeadline = pollserver.Now() + fd.rdeadline_delta
+	} else {
+		fd.rdeadline = 0
+	}
 
 	// See ../syscall/exec.go for description of ForkLock.
 	// It is okay to hold the lock across syscall.Accept
@@ -598,7 +603,7 @@ func (fd *netFD) accept(toAddr func(syscall.Sockaddr) Addr) (nfd *netFD, err os.
 			return nil, os.EINVAL
 		}
 		s, rsa, e = syscall.Accept(fd.sysfd)
-		if e != syscall.EAGAIN {
+		if e != syscall.EAGAIN || fd.rdeadline < 0 {
 			break
 		}
 		syscall.ForkLock.RUnlock()

src/pkg/net/tcpsock.go

@@ -298,6 +298,14 @@ func (l *TCPListener) Close() os.Error {
 // Addr returns the listener's network address, a *TCPAddr.
 func (l *TCPListener) Addr() Addr { return l.fd.laddr }
 
+// SetTimeout sets the deadline associated with the listener
+func (l *TCPListener) SetTimeout(nsec int64) os.Error {
+	if l == nil || l.fd == nil {
+		return os.EINVAL
+	}
+	return setTimeout(l.fd, nsec)
+}
+
 // File returns a copy of the underlying os.File, set to blocking mode.
 // It is the caller's responsibility to close f when finished.
 // Closing c does not affect f, and closing f does not affect c.

src/pkg/net/unixsock.go

@@ -423,6 +423,14 @@ func (l *UnixListener) Close() os.Error {
 // Addr returns the listener's network address.
 func (l *UnixListener) Addr() Addr { return l.fd.laddr }
 
+// SetTimeout sets the deadline associated wuth the listener
+func (l *UnixListener) SetTimeout(nsec int64) (err os.Error) {
+	if l == nil || l.fd == nil {
+		return os.EINVAL
+	}
+	return setTimeout(l.fd, nsec)
+}
+
 // File returns a copy of the underlying os.File, set to blocking mode.
 // It is the caller's responsibility to close f when finished.
 // Closing c does not affect f, and closing f does not affect c.