/********************************************************/

/*  ntapi: Native API core library                      */

/*  Copyright (C) 2013--2017  Z. Gilboa                 */

/*  Released under GPLv2 and GPLv3; see COPYING.NTAPI.  */

/********************************************************/

#include <psxtypes/psxtypes.h>

#include <ntapi/nt_atomic.h>

#include <ntapi/nt_status.h>

#include <ntapi/nt_object.h>

#include <ntapi/nt_memory.h>

#include <ntapi/nt_thread.h>

#include <ntapi/nt_process.h>

#include <ntapi/nt_string.h>

#include <ntapi/ntapi.h>

#include "ntapi_impl.h"

intptr_t __cdecl	__attr_hidden__ __tt_fork_v1(void);

uint32_t __fastcall	__attr_hidden__ __tt_fork_child_entry_point(uintptr_t saved_regs_stack_pointer);

uint32_t __fastcall	__attr_hidden__ __tt_fork_child_entry_point_adj(uintptr_t saved_regs_stack_pointer);

/** legacy fork chronology:

 *

 *  parent:

 *	__ntapi_tt_fork ->

 *		__tt_fork ->

 *			__tt_fork_impl ->

 *		return to __tt_fork -->

 *	__ntapi_tt_fork

 *	-> return to caller

 *

 *  child:

 *		__tt_fork_child_entry_point[_adj] ->

 *	__ntapi_tt_fork (internal return) ->

 *	-> return to caller

**/

static intptr_t __tt_fork_cancel(void * hprocess,int32_t status)

{

	__ntapi->zw_terminate_process(hprocess, status);

	__ntapi->zw_close(hprocess);

	return (intptr_t)(-1);

}

intptr_t __fastcall __tt_fork_impl_v1(

	uintptr_t	saved_regs_stack_pointer,

	uintptr_t	stack_adjustment)

{

	int32_t			status;

	void *			hprocess;

	void *			hthread;

	void **			hport_session;

	ntapi_internals *	__internals;

	nt_object_attributes		oa;

	nt_process_basic_information	pbi;

	nt_thread_context		context;

	nt_user_stack			stack;

	nt_memory_basic_information	mbi;

	nt_client_id			cid;

	nt_large_integer		timeout;

	hprocess = 0;

	hthread  = 0;

	oa.len		= sizeof(nt_object_attributes);

	oa.root_dir	= 0;

	oa.obj_name	= 0;

	oa.obj_attr	= 0;

	oa.sec_desc	= 0;

	oa.sec_qos	= 0;

	if ((status = __ntapi->zw_create_process(

			&hprocess,

			NT_PROCESS_ALL_ACCESS,

			&oa,

			NT_CURRENT_PROCESS_HANDLE,

			1,0,0,0)))

		return (intptr_t)(-1);

	if ((status = __ntapi->zw_query_information_process(

			hprocess,

			NT_PROCESS_BASIC_INFORMATION,

			(void *)&pbi,

			sizeof(nt_process_basic_information),

			0)))

		return __tt_fork_cancel(hprocess,status);

	__ntapi->tt_aligned_block_memset(

		&context,0,sizeof(nt_thread_context));

	__INIT_CONTEXT(context);

	context.STACK_POINTER_REGISTER = saved_regs_stack_pointer;

	context.FAST_CALL_ARG0 = saved_regs_stack_pointer;

	context.INSTRUCTION_POINTER_REGISTER = stack_adjustment

		? (uintptr_t)__tt_fork_child_entry_point_adj

		: (uintptr_t)__tt_fork_child_entry_point;

	if ((status = __ntapi->zw_query_virtual_memory(

			NT_CURRENT_PROCESS_HANDLE,

			(void *)context.STACK_POINTER_REGISTER,

			NT_MEMORY_BASIC_INFORMATION,

			&mbi,sizeof(nt_memory_basic_information),0)))

		return __tt_fork_cancel(hprocess,status);

	stack.fixed_stack_base		= (void *)0;

	stack.fixed_stack_limit		= (void *)0;

	stack.expandable_stack_base	= (void *)((uintptr_t)mbi.base_address + mbi.region_size);

	stack.expandable_stack_limit	= (void *)mbi.base_address;

	stack.expandable_stack_bottom	= (void *)mbi.allocation_base;

	__internals	= __ntapi_internals();

	hport_session	= &__internals->hport_tty_session;

	timeout.quad	= (-1) * 10 * 1000 * __NT_FORK_CHILD_WAIT_MILLISEC;

	if (hport_session && *hport_session)

		if ((status = __ntapi->tty_client_process_register(

				*hport_session,

				pbi.unique_process_id,

				0, 0, &timeout)))

			return __tt_fork_cancel(hprocess,status);

	if ((status = __ntapi->zw_create_thread(

			&hthread,

			NT_THREAD_ALL_ACCESS,

			&oa,hprocess,&cid,

			&context,&stack,0)))

		return __tt_fork_cancel(hprocess,status);

	if (cid.process_id > 0) {

		__internals->hany[0] = hprocess;

		__internals->hany[1] = hthread;

	} else {

		__internals->hany[0] = 0;

		__internals->hany[1] = 0;

	}

	/* hoppla */

	return (int32_t)cid.process_id;

}

intptr_t __fastcall __ntapi_tt_fork_v1(

	__out	void **		hprocess,

	__out	void **		hthread)

{

	int32_t			status;

	intptr_t		pid;

	nt_large_integer	timeout;

	void **			hport_session;

	void *			htty_connected;

	ntapi_internals *	__internals;

	__internals	= __ntapi_internals();

	hport_session	= &__internals->hport_tty_session;

	timeout.quad	= (-1) * 10 * 1000 * __NT_FORK_CHILD_WAIT_MILLISEC;

	htty_connected  = 0;

	if (at_locked_cas(&__internals->hlock,0,1))

		return (intptr_t)(-1);

	if (hport_session && *hport_session)

		if (__ntapi_tt_create_inheritable_event(

				&htty_connected,

				NT_NOTIFICATION_EVENT,

				NT_EVENT_NOT_SIGNALED))

			return (intptr_t)(-1);

	pid = __tt_fork_v1();

	*hprocess = __internals->hany[0];

	*hthread  = __internals->hany[1];

	at_store(&__internals->hlock,0);

	if (hport_session && *hport_session) {

		if (pid == 0) {

			if ((status = __ntapi->tty_connect(

					hport_session,

					__internals->subsystem->base_named_objects,

					NT_SECURITY_IMPERSONATION)))

				return __tt_fork_cancel(NT_CURRENT_PROCESS_HANDLE,status);

			__internals->hdev_mount_point_mgr = 0;

			if (__internals->rtdata)

				__internals->rtdata->hsession = *hport_session;

			__ntapi->zw_set_event(

				htty_connected,

				0);

		} else if (pid > 0) {

			status = __ntapi->zw_wait_for_single_object(

				htty_connected,

				NT_SYNC_NON_ALERTABLE,

				&timeout);

			if (status && __PSX_DEBUG)

				if ((status = __ntapi->zw_wait_for_single_object(

						htty_connected,

						NT_SYNC_NON_ALERTABLE,

						0)))

					pid = __tt_fork_cancel(*hprocess,status);

		}

		__ntapi->zw_close(htty_connected);

	}

	return pid;

}