net: add Listen system call hook for testing

Change-Id: I63053c45081f47ba736720a78d85c31c13767891
Reviewed-on: https://go-review.googlesource.com/8642
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/net/hook_unix.go

@@ -15,6 +15,7 @@ var (
 	socketFunc        func(int, int, int) (int, error)         = syscall.Socket
 	closeFunc         func(int) error                          = syscall.Close
 	connectFunc       func(int, syscall.Sockaddr) error        = syscall.Connect
+	listenFunc        func(int, int) error                     = syscall.Listen
 	acceptFunc        func(int) (int, syscall.Sockaddr, error) = syscall.Accept
 	getsockoptIntFunc func(int, int, int) (int, error)         = syscall.GetsockoptInt
 )

src/net/hook_windows.go

@@ -17,4 +17,5 @@ var (
 	closeFunc     func(syscall.Handle) error                                                                = syscall.Closesocket
 	connectFunc   func(syscall.Handle, syscall.Sockaddr) error                                              = syscall.Connect
 	connectExFunc func(syscall.Handle, syscall.Sockaddr, *byte, uint32, *uint32, *syscall.Overlapped) error = syscall.ConnectEx
+	listenFunc    func(syscall.Handle, int) error                                                           = syscall.Listen
 )

src/net/main_test.go

@@ -142,7 +142,7 @@ func printLeakedSockets() {
 	}
 	fmt.Fprintf(os.Stderr, "Leaked sockets:\n")
 	for s, so := range sos {
-		fmt.Fprintf(os.Stderr, "%v: %+v\n", s, so)
+		fmt.Fprintf(os.Stderr, "%v: %v\n", s, so)
 	}
 	fmt.Fprintf(os.Stderr, "\n")
 }
@@ -154,7 +154,7 @@ func printSocketStats() {
 	}
 	fmt.Fprintf(os.Stderr, "Socket statistical information:\n")
 	for _, st := range sts {
-		fmt.Fprintf(os.Stderr, "%+v\n", st)
+		fmt.Fprintf(os.Stderr, "%v\n", st)
 	}
 	fmt.Fprintf(os.Stderr, "\n")
 }

src/net/main_unix_test.go

@@ -11,6 +11,7 @@ var (
 	origSocket        = socketFunc
 	origClose         = closeFunc
 	origConnect       = connectFunc
+	origListen        = listenFunc
 	origAccept        = acceptFunc
 	origGetsockoptInt = getsockoptIntFunc
 
@@ -22,6 +23,7 @@ func installTestHooks() {
 	socketFunc = sw.Socket
 	closeFunc = sw.Close
 	connectFunc = sw.Connect
+	listenFunc = sw.Listen
 	acceptFunc = sw.Accept
 	getsockoptIntFunc = sw.GetsockoptInt
 
@@ -34,6 +36,7 @@ func uninstallTestHooks() {
 	socketFunc = origSocket
 	closeFunc = origClose
 	connectFunc = origConnect
+	listenFunc = origListen
 	acceptFunc = origAccept
 	getsockoptIntFunc = origGetsockoptInt
 

src/net/main_windows_test.go

@@ -10,6 +10,7 @@ var (
 	origClosesocket = closeFunc
 	origConnect     = connectFunc
 	origConnectEx   = connectExFunc
+	origListen      = listenFunc
 )
 
 func installTestHooks() {
@@ -17,6 +18,7 @@ func installTestHooks() {
 	closeFunc = sw.Closesocket
 	connectFunc = sw.Connect
 	connectExFunc = sw.ConnectEx
+	listenFunc = sw.Listen
 }
 
 func uninstallTestHooks() {
@@ -24,6 +26,7 @@ func uninstallTestHooks() {
 	closeFunc = origClosesocket
 	connectFunc = origConnect
 	connectExFunc = origConnectEx
+	listenFunc = origListen
 }
 
 func forceCloseSockets() {

src/net/sock_posix.go

@@ -163,7 +163,7 @@ func (fd *netFD) listenStream(laddr sockaddr, backlog int) error {
 			return os.NewSyscallError("bind", err)
 		}
 	}
-	if err := syscall.Listen(fd.sysfd, backlog); err != nil {
+	if err := listenFunc(fd.sysfd, backlog); err != nil {
 		return os.NewSyscallError("listen", err)
 	}
 	if err := fd.init(); err != nil {