Blame src/daemon/ptyc_daemon_init.c

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/*********************************************************/
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/*  ptycon: a pty-console bridge                         */
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/*  Copyright (C) 2016--2017  Z. Gilboa                  */
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/*  Released under GPLv2 and GPLv3; see COPYING.PTYCON.  */
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/*********************************************************/
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#include <psxtypes/psxtypes.h>
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#include <ntapi/ntapi.h>
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#include <ntapi/nt_atomic.h>
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#include <ptycon/ptycon.h>
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#include "ptycon_daemon_impl.h"
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#include "ptycon_driver_impl.h"
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static const nt_guid ptyc_daemon_guid = PTYC_PORT_GUID_DAEMON;
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static int32_t ptyc_daemon_init_impl(struct ptyc_daemon_ctx * dctx, void * htty)
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{
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	int32_t				status;
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	nt_daemon_params		dparams;
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	wchar16_t *			port_name;
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	nt_port_name_keys *		port_name_keys;
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	/* daemon attributes */
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	dctx->daemon_attr.type    = NT_PORT_TYPE_DAEMON;
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	dctx->daemon_attr.subtype = NT_PORT_SUBTYPE_DEFAULT;
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	/* port guid */
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	ntapi->tt_guid_copy(
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		&dctx->daemon_attr.guid,
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		&ptyc_daemon_guid);
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	/* port keys */
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	if ((status = ntapi->tt_port_generate_keys(&dctx->daemon_attr.keys)))
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		return status;
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	/* port name */
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	ntapi->tt_port_name_from_attr(
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		&dctx->daemon_name,
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		&dctx->daemon_attr);
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	/* dparams */
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	ntapi->tt_aligned_block_memset(
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		&dparams,0,sizeof(dparams));
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	port_name      = (wchar16_t *)&dctx->daemon_name;
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	port_name_keys = (nt_port_name_keys *)&dctx->daemon_name.port_name_keys;
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	dparams.port_keys	= &dctx->daemon_keys;
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	dparams.port_name	= port_name;
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	dparams.port_name_keys	= port_name_keys;
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	dparams.port_msg_size	= sizeof(nt_tty_port_msg);
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	dparams.flags		= NT_DSR_INIT_DEFAULT;
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	dparams.daemon_once_routine	= 0;
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	dparams.daemon_loop_routine	= ptyc_daemon_loop;
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	dparams.daemon_loop_context	= dctx;
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	dparams.pport_daemon		= &dctx->hport_daemon;
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	dparams.pport_internal_client	= &dctx->hport_internal_client;
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	dparams.pevent_daemon_ready		= &dctx->hevent_daemon_ready;
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	dparams.pevent_internal_client_ready	= &dctx->hevent_internal_client_ready;
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	dparams.stack_size_commit		= 8192;
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	dparams.stack_size_reserve		= 8192;
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	if ((status = ntapi->dsr_init(&dparams)))
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		return status;
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	return ntapi->tty_request_peer(
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                htty,
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		PTYC_DAEMON_TTYSIGNAL,
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		0,&(nt_guid)TTY_PTS_GUID,
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		&dctx->daemon_attr);
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}
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static int32_t ptyc_daemon_once = 0;
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int32_t __stdcall ptyc_daemon_init(struct ptyc_daemon_ctx * dctx, uint64_t drvflags)
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{
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	int32_t			status;
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	nt_timeout		timeout;
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	nt_runtime_data *	rtdata;
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	/* rtdata */
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	if ((status = ntapi->tt_get_runtime_data(&rtdata,0)))
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		return status;
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	/* needed? */
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	if (drvflags & PTYC_DRIVER_DAEMON_NEVER)
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		return 0;
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	if (!(drvflags & PTYC_DRIVER_DAEMON_ALWAYS))
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		if (ntapi->tt_guid_compare(&rtdata->srv_guid,&ptyc_daemon_guid))
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			return 0;
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	/* once */
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	switch (at_locked_cas_32(&ptyc_daemon_once,0,1)) {
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		case 0:
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			if ((status = ptyc_daemon_init_impl(dctx,rtdata->hsession))) {
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				at_locked_add_32(&ptyc_daemon_once,2);
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				return status;
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			}
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			at_locked_inc_32(&ptyc_daemon_once);
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			return 0;
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		case 1:
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			timeout.quad = -10;
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			for (; (at_locked_cas_32(&ptyc_daemon_once,0,1) == 1); )
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				ntapi->zw_delay_execution(
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					NT_SYNC_ALERTABLE,
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					&timeout);
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			return (ptyc_daemon_once == 2)
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				? 0 : -1;
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		case 2:
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			return 0;
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		case 3:
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		default:
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			return -1;
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	}
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}