net: Restore earlier Solaris-specific version of setKeepAlivePeriod.

The version from the master repository seems to be appropriate
for OpenSolaris but not for Solaris itself.  Solaris 11.2
proper does not define TCP_KEEPIDLE or TCP_KEEPINTVL.

From-SVN: r219749

libgo/Makefile.am

@@ -762,6 +762,9 @@ else
 if LIBGO_IS_DARWIN
 go_net_tcpsockopt_file = go/net/tcpsockopt_darwin.go
 else
+if LIBGO_IS_SOLARIS
+go_net_tcpsockopt_file = go/net/tcpsockopt_solaris.go
+else
 if LIBGO_IS_DRAGONFLY
 go_net_tcpsockopt_file = go/net/tcpsockopt_dragonfly.go
 else
@@ -769,6 +772,7 @@ go_net_tcpsockopt_file = go/net/tcpsockopt_unix.go
 endif
 endif
 endif
+endif
 
 go_net_files = \
 	go/net/cgo_unix.go \

libgo/Makefile.in

@@ -1019,8 +1019,9 @@ go_mime_files = \
 @LIBGO_IS_LINUX_TRUE@go_net_interface_file = go/net/interface_linux.go
 @LIBGO_IS_LINUX_FALSE@go_net_cloexec_file = go/net/sys_cloexec.go
 @LIBGO_IS_LINUX_TRUE@go_net_cloexec_file = go/net/sock_cloexec.go
-@LIBGO_IS_DARWIN_FALSE@@LIBGO_IS_DRAGONFLY_FALSE@@LIBGO_IS_OPENBSD_FALSE@go_net_tcpsockopt_file = go/net/tcpsockopt_unix.go
-@LIBGO_IS_DARWIN_FALSE@@LIBGO_IS_DRAGONFLY_TRUE@@LIBGO_IS_OPENBSD_FALSE@go_net_tcpsockopt_file = go/net/tcpsockopt_dragonfly.go
+@LIBGO_IS_DARWIN_FALSE@@LIBGO_IS_DRAGONFLY_FALSE@@LIBGO_IS_OPENBSD_FALSE@@LIBGO_IS_SOLARIS_FALSE@go_net_tcpsockopt_file = go/net/tcpsockopt_unix.go
+@LIBGO_IS_DARWIN_FALSE@@LIBGO_IS_DRAGONFLY_TRUE@@LIBGO_IS_OPENBSD_FALSE@@LIBGO_IS_SOLARIS_FALSE@go_net_tcpsockopt_file = go/net/tcpsockopt_dragonfly.go
+@LIBGO_IS_DARWIN_FALSE@@LIBGO_IS_OPENBSD_FALSE@@LIBGO_IS_SOLARIS_TRUE@go_net_tcpsockopt_file = go/net/tcpsockopt_solaris.go
 @LIBGO_IS_DARWIN_TRUE@@LIBGO_IS_OPENBSD_FALSE@go_net_tcpsockopt_file = go/net/tcpsockopt_darwin.go
 @LIBGO_IS_OPENBSD_TRUE@go_net_tcpsockopt_file = go/net/tcpsockopt_openbsd.go
 go_net_files = \

libgo/go/net/tcpsockopt_solaris.go

+// Copyright 2013 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.
+
+// TCP socket options for solaris
+
+package net
+
+import (
+	"os"
+	"syscall"
+	"time"
+)
+
+// Set keep alive period.
+func setKeepAlivePeriod(fd *netFD, d time.Duration) error {
+	if err := fd.incref(); err != nil {
+		return err
+	}
+	defer fd.decref()
+
+	// The kernel expects seconds so round to next highest second.
+	d += (time.Second - time.Nanosecond)
+	secs := int(d.Seconds())
+
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, syscall.SO_KEEPALIVE, secs))
+}