liblaunch: add task creation flags for use by fork and posix_spawn

lib/liblaunch/elf.c

@@ -174,7 +174,7 @@ static kern_status_t create_exec_regions(struct elf_image *image)
 	if (image->e_remote_space != KERN_HANDLE_INVALID) {
 		status = address_space_reserve(
 			image->e_remote_space,
-			MAP_ADDRESS_ANY,
+			0xF0000000,
 			image->e_total_size,
 			&image->e_remote_base);
 	}
@@ -188,6 +188,7 @@ static kern_status_t create_exec_regions(struct elf_image *image)
 		return status;
 	}
 
+	kern_tracef("launch: image base=%zx", image->e_remote_base);
 	return KERN_OK;
 }
 

lib/liblaunch/include/launch.h

@@ -25,7 +25,8 @@ enum launch_status {
 };
 
 enum launch_flags {
-	LAUNCH_F_NONE = 0,
+	LAUNCH_F_NONE = 0x00,
+	LAUNCH_F_CLONE_ALL_HANDLES = 0x01u,
 };
 
 struct launch_ctx;

lib/liblaunch/launch.c

@@ -123,8 +123,15 @@ enum launch_status launch_ctx_execute(
 	size_t name_len = params->p_task_name ? strlen(params->p_task_name) : 0;
 	kern_handle_t remote_task = KERN_HANDLE_INVALID,
 		      remote_address_space = KERN_HANDLE_INVALID;
+	task_flags_t task_flags = TASK_F_DEFAULT;
+
+	if (flags & LAUNCH_F_CLONE_ALL_HANDLES) {
+		task_flags |= TASK_F_CLONE_ALL_HANDLES;
+	}
+
 	kstatus = task_create(
 		params->p_parent_task,
+		task_flags,
 		params->p_task_name,
 		name_len,
 		&remote_task,