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/**
@file
@brief    'exit' event
@details  Copyright (c) 2017-2021 Acronis International GmbH
@author   Mikhail Krivtsov (mikhail.krivtsov@acronis.com)
@since    $Id: $
*/

#include "exit_event.h"

#include "debug.h"
#include "message.h"
#include "si_templates.h"
#include "si_writer_common.h"
#include "task_info_map.h"

static const uint8_t k_exit_fields[] = { 
	SI_COMMON_FIELDS,
};

static void exit_event_with_alloc_flags(struct task_struct* tsk, bool nowait)
{
	msg_t* msg;
	const uint32_t msg_size = SI_ESTIMATE_SIZE_CONST_PARAMS(k_exit_fields);
	pid_t pid = tsk->pid;
	pid_t tgid = tsk->tgid;
	uint64_t unique_pid = make_unique_pid(tsk);

	msg = msg_new_with_alloc_flags(FP_SI_OT_NOTIFY_PROCESS_EXIT, 0, SI_CT_POST_CALLBACK, unique_pid, msg_size, nowait);
	if (msg) {
		si_property_writer_t writer;
		task_info_t* task_info = task_info_lookup(tgid, unique_pid);
		uint64_t event_uid = transport_global_sequence_next();

		si_event_writer_init(&writer, &msg->event, msg_size);
		si_property_writer_write_common(&writer, event_uid, pid, tgid, task_info);
		si_event_writer_finalize(&msg->event, &writer);

		if (task_info) {
			task_info_put(task_info);
		}

		send_msg_async(msg);
		msg_unref(msg);
	}

	// This is not a strong guarantee that all other threads has exited but
	// it is as close as kernel can provide to us.
	if (tgid == pid)
		task_info_map_on_exit_event(tsk);
}

void exit_event_nowait(struct task_struct* tsk)
{
	return exit_event_with_alloc_flags(tsk, true /*nowait*/);
}

void exit_event(struct task_struct* tsk)
{
	return exit_event_with_alloc_flags(tsk, false /*nowait*/);
}