diff -r 6053abaa495b src/pkg/syscall/zerrors_windows_386.go
--- a/src/pkg/syscall/zerrors_windows_386.go	Thu Oct 21 10:47:02 2010 +1100
+++ b/src/pkg/syscall/zerrors_windows_386.go	Thu Oct 21 09:49:04 2010 +0900
@@ -12,6 +12,18 @@
 // Windows reserves errors >= 1<<29 for application use.
 const APPLICATION_ERROR = 1 << 29

+// Signal values.
+const (
+	SIGINT   = 0x2
+	SIGILL   = 0x4
+	SIGFPE   = 0x8
+	SIGKILL  = 0x9
+	SIGSEGV  = 0xb
+	SIGTERM  = 0xf
+	SIGBREAK = 0x15
+	SIGABRT  = 0x16
+)
+
 // Invented values to support what package os and others expects.
 const (
 	E2BIG = APPLICATION_ERROR + iota
diff -r 6053abaa495b src/pkg/syscall/zsyscall_windows_386.go
--- a/src/pkg/syscall/zsyscall_windows_386.go	Thu Oct 21 10:47:02 2010 +1100
+++ b/src/pkg/syscall/zsyscall_windows_386.go	Thu Oct 21 09:49:04 2010 +0900
@@ -60,6 +60,7 @@
 	procGetEnvironmentVariableW    = getSysProcAddr(modkernel32, "GetEnvironmentVariableW")
 	procSetEnvironmentVariableW    = getSysProcAddr(modkernel32, "SetEnvironmentVariableW")
 	procSetFileTime                = getSysProcAddr(modkernel32, "SetFileTime")
+	procTerminateProcess           = getSysProcAddr(modkernel32, "TerminateProcess")
 	procWSAStartup                 = getSysProcAddr(modwsock32, "WSAStartup")
 	procWSACleanup                 = getSysProcAddr(modwsock32, "WSACleanup")
 	procsocket                     = getSysProcAddr(modwsock32, "socket")
@@ -786,6 +787,34 @@
 	return
 }

+func TerminateProcess(h int32, c uint32) (ok bool, errno int) {
+	r0, _, e1 := Syscall(procTerminateProcess, uintptr(h), uintptr(c), 0)
+	ok = bool(r0 != 0)
+	if !ok {
+		if e1 != 0 {
+			errno = int(e1)
+		} else {
+			errno = EINVAL
+		}
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func Kill(pid int, sig int) (errno int) {
+	if sig != SIGKILL { // TODO(mattn): meaning/treating SIGKILL
+		return ENOSYS
+	}
+	handle, errno := OpenProcess(PROCESS_ALL_ACCESS, 0, uint32(pid))
+	if errno != 0 {
+		return errno
+	}
+	defer CloseHandle(int32(handle))
+	_, errno = TerminateProcess(int32(handle), 0)
+	return
+}
+
 func WSAStartup(verreq uint32, data *WSAData) (sockerrno int) {
 	r0, _, _ := Syscall(procWSAStartup, uintptr(verreq), uintptr(unsafe.Pointer(data)), 0)
 	sockerrno = int(r0)
diff -r 6053abaa495b src/pkg/syscall/ztypes_windows_386.go
--- a/src/pkg/syscall/ztypes_windows_386.go	Thu Oct 21 10:47:02 2010 +1100
+++ b/src/pkg/syscall/ztypes_windows_386.go	Thu Oct 21 09:49:04 2010 +0900
@@ -481,5 +481,7 @@
 	HANDLE_FLAG_INHERIT            = 0x00000001
 	HANDLE_FLAG_PROTECT_FROM_CLOSE = 0x00000002

-	PROCESS_ALL_ACCESS = 0x001fffff
+	SYNCHRONIZE              = 0x100000
+	STANDARD_RIGHTS_REQUIRED = 0xf0000
+	PROCESS_ALL_ACCESS       = (STANDARD_RIGHTS_REQUIRED | SYNCHRONIZE | 0xfff)
 )