rune/libenclave: Move pal_kill to Enclave Runtime PAI API v2

This API is not defined in v1 at all.
Signed-off-by: NTianjia Zhang <tianjia.zhang@linux.alibaba.com>

rune/libenclave/agent.go

@@ -214,7 +214,7 @@ func relaySignal(signalPipe *os.File, id int) {
 			return
 		}
 
-		err := enclaveRuntime.KillPayload(int(req.Kill.Sig), id)
+		err := enclaveRuntime.KillPayload(id, int(req.Kill.Sig))
 		if err != nil {
 			logrus.Errorf("unable to kill payload with sig %d by %d: %v\n", int(req.Kill.Sig), id, err)
 			return

rune/libenclave/internal/runtime/enclave_runtime.go

@@ -74,14 +74,14 @@ func (rt *EnclaveRuntimeWrapper) ExecutePayload(cmd []string, envp []string, std
 	return rt.runtime.Exec(cmd, envp, stdio)
 }
 
-func (rt *EnclaveRuntimeWrapper) KillPayload(sig int, pid int) error {
+func (rt *EnclaveRuntimeWrapper) KillPayload(pid int, sig int) error {
 	if pid != -1 {
 		logrus.Debugf("enclave runtime killing payload %d with signal %d", pid, sig)
 	} else {
 		logrus.Debugf("enclave runtime killing all payloads with signal %d", sig)
 	}
 
-	return rt.runtime.Kill(sig, pid)
+	return rt.runtime.Kill(pid, sig)
 }
 
 func (rt *EnclaveRuntimeWrapper) DestroyInstance() error {

rune/libenclave/internal/runtime/pal/api_linux_v1.go

@@ -37,11 +37,6 @@ static int palExecV1(void *sym, const char *exe, const char *argv[],
 		(exe, argv, &fds, exit_code);
 }
 
-static int palKillV1(void *sym, int sig, int pid)
-{
-	return ((int (*)(int, int))sym)(sig, pid);
-}
-
 static int palDestroyV1(void *sym)
 {
 	return ((int (*)(void))sym)();
@@ -131,17 +126,6 @@ func (pal *enclaveRuntimePalApiV1) exec(cmd []string, envs []string, stdio [3]*o
 	return exitCode, nil
 }
 
-func (pal *enclaveRuntimePalApiV1) kill(sig int, pid int) error {
-	sigNum := C.int(sig)
-	pidNum := C.int(pid)
-	sym := nsenter.SymAddrPalKill()
-	ret := C.palKillV1(sym, sigNum, pidNum)
-	if ret < 0 {
-		return fmt.Errorf("pal kill() failed with %d", ret)
-	}
-	return nil
-}
-
 func (pal *enclaveRuntimePalApiV1) destroy() error {
 	logrus.Debugf("pal destroy() called")
 

rune/libenclave/internal/runtime/pal/api_linux_v2.go

@@ -50,6 +50,11 @@ static int palExecV2(void *sym, int pid, int *exit_code)
 	return ((int (*)(pal_exec_args *))sym)
 		(&args);
 }
+
+static int palKillV2(void *sym, int pid, int sig)
+{
+	return ((int (*)(int, int))sym)(pid, sig);
+}
 */
 import "C"
 
@@ -115,3 +120,18 @@ func (pal *enclaveRuntimePalApiV2) exec(cmd []string, envs []string, stdio [3]*o
 	}
 	return exitCode, nil
 }
+
+func (pal *enclaveRuntimePalApiV2) kill(pid int, sig int) error {
+	pidNum := C.int(pid)
+	sigNum := C.int(sig)
+	sym := nsenter.SymAddrPalKill()
+	if sym == nil {
+		return fmt.Errorf("pal kill() not implemented")
+	}
+
+	ret := C.palKillV2(sym, pidNum, sigNum)
+	if ret < 0 {
+		return fmt.Errorf("pal kill() failed with %d", ret)
+	}
+	return nil
+}

rune/libenclave/internal/runtime/pal/pal_linux.go

@@ -45,12 +45,13 @@ func (pal *enclaveRuntimePal) Exec(cmd []string, envp []string, stdio [3]*os.Fil
 	return api.exec(cmd, envp, stdio)
 }
 
-func (pal *enclaveRuntimePal) Kill(sig int, pid int) error {
-	if pal.version >= 2 {
-		api := &enclaveRuntimePalApiV1{}
-		return api.kill(sig, pid)
+func (pal *enclaveRuntimePal) Kill(pid int, sig int) error {
+	if pal.version == 1 {
+		return nil
 	}
-	return nil
+
+	api := &enclaveRuntimePalApiV2{}
+	return api.kill(pid, sig)
 }
 
 func (pal *enclaveRuntimePal) Destroy() error {