fix exec_other signature, fix syscall return vlaues

Signed-off-by: leongross <[email protected]>

src/os/exec_other.go

@@ -7,6 +7,6 @@ func forkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err error)
 	return 0, ErrNotImplemented
 }
 
-func startProcess(argv0 string, argv []string, attr *ProcAttr) (pid int, handle uintptr, err error) {
-	return 0, 0, ErrNotImplemented
+func startProcess(argv0 string, argv []string, attr *ProcAttr) (proc *Process, err error) {
+	return &Process{Pid: 0}, ErrNotImplemented
 }

src/os/exec_posix.go

@@ -75,13 +75,17 @@ func forkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err error)
 		argvp[0] = argv0p
 	}
 
-	ret, _, _ = syscall.Fork()
+	pid = syscall.Fork()
+	if ret < 0 {
+		return 0, errors.New("fork failed")
+	}
+
 	if ret != 0 {
 		// if fd == 0 code runs in parent
 		return int(ret), nil
 	} else {
 		// else code runs in child, which then should exec the new process
-		ret, _, _ = syscall.Execve(argv0, argv, envp)
+		ret = syscall.Execve(argv0, argv, envp)
 		if ret != 0 {
 			// exec failed
 			syscall.Exit(1)