fix: activation of multiple sockets fails on 64-bit platforms (#3)

.gitignore

@@ -19,3 +19,5 @@
 
 # Go workspace file
 go.work
+
+example/example

launchd.go

@@ -15,7 +15,7 @@ func Files(name string) ([]*os.File, error) {
 	}
 	files := make([]*os.File, len(fds))
 	for idx, fd := range fds {
-		files[idx] = os.NewFile(uintptr(fd), "")
+		files[idx] = os.NewFile(fd, "")
 	}
 	return files, nil
 }
@@ -44,7 +44,7 @@ func Activate(name string) (net.Listener, error) {
 	if err != nil {
 		return nil, err
 	} else if len(listeners) != 1 {
-		return nil, syscall.EINVAL
+		return nil, fmt.Errorf("too many sockets: %v: %w", len(listeners), syscall.EINVAL)
 	}
 	return listeners[0], nil
 }

libxpc.go

@@ -21,7 +21,7 @@ var libxpc_launch_activate_socket_trampoline_addr uintptr
 //go:cgo_import_dynamic libxpc_launch_activate_socket launch_activate_socket "/usr/lib/system/libxpc.dylib"
 
 // invokes launch_activate_socket
-func libxpc_launch_activate_socket(name string) ([]int, error) {
+func libxpc_launch_activate_socket(name string) ([]uintptr, error) {
 	c_name_ptr, err := syscall.BytePtrFromString(name)
 	if err != nil {
 		return nil, err
@@ -45,8 +45,10 @@ func libxpc_launch_activate_socket(name string) ([]int, error) {
 	} else if c_cnt > maxFDs {
 		return nil, syscall.EINVAL
 	}
-	c_fds := (*[maxFDs]int)(unsafe.Pointer(c_fds_ptr))
-	fds := make([]int, c_cnt)
-	copy(fds, (*c_fds)[0:c_cnt])
+	c_fds := (*[maxFDs]int32)(unsafe.Pointer(c_fds_ptr))
+	fds := make([]uintptr, c_cnt)
+	for idx, fd := range c_fds[0:c_cnt] {
+		fds[idx] = uintptr(fd)
+	}
 	return fds, nil
 }