virtualx-engine/thirdparty/libwebsockets/lib/roles/pipe/ops-pipe.c

/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010-2018 Andy Green <andy@warmcat.com>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation:
 *  version 2.1 of the License.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA  02110-1301  USA
 */

#include <core/private.h>

static int
rops_handle_POLLIN_pipe(struct lws_context_per_thread *pt, struct lws *wsi,
			struct lws_pollfd *pollfd)
{
#if !defined(WIN32) && !defined(_WIN32)
	char s[100];
	int n;

	/*
	 * discard the byte(s) that signaled us
	 * We really don't care about the number of bytes, but coverity
	 * thinks we should.
	 */
	n = read(wsi->desc.sockfd, s, sizeof(s));
	(void)n;
	if (n < 0)
		return LWS_HPI_RET_PLEASE_CLOSE_ME;
#endif

#if defined(LWS_WITH_THREADPOOL)
	/*
	 * threadpools that need to call for on_writable callbacks do it by
	 * marking the task as needing one for its wsi, then cancelling service.
	 *
	 * Each tsi will call this to perform the actual callback_on_writable
	 * from the correct service thread context
	 */
	lws_threadpool_tsi_context(pt->context, pt->tid);
#endif

	/*
	 * the poll() wait, or the event loop for libuv etc is a
	 * process-wide resource that we interrupted.  So let every
	 * protocol that may be interested in the pipe event know that
	 * it happened.
	 */
	if (lws_broadcast(wsi->context, LWS_CALLBACK_EVENT_WAIT_CANCELLED,
			  NULL, 0)) {
		lwsl_info("closed in event cancel\n");
		return LWS_HPI_RET_PLEASE_CLOSE_ME;
	}

	return LWS_HPI_RET_HANDLED;
}

struct lws_role_ops role_ops_pipe = {
	/* role name */			"pipe",
	/* alpn id */			NULL,
	/* check_upgrades */		NULL,
	/* init_context */		NULL,
	/* init_vhost */		NULL,
	/* destroy_vhost */		NULL,
	/* periodic_checks */		NULL,
	/* service_flag_pending */	NULL,
	/* handle_POLLIN */		rops_handle_POLLIN_pipe,
	/* handle_POLLOUT */		NULL,
	/* perform_user_POLLOUT */	NULL,
	/* callback_on_writable */	NULL,
	/* tx_credit */			NULL,
	/* write_role_protocol */	NULL,
	/* encapsulation_parent */	NULL,
	/* alpn_negotiated */		NULL,
	/* close_via_role_protocol */	NULL,
	/* close_role */		NULL,
	/* close_kill_connection */	NULL,
	/* destroy_role */		NULL,
	/* adoption_bind */		NULL,
	/* client_bind */		NULL,
	/* writeable cb clnt, srv */	{ 0, 0 },
	/* close cb clnt, srv */	{ 0, 0 },
	/* protocol_bind_cb c,s */	{ 0, 0 },
	/* protocol_unbind_cb c,s */	{ 0, 0 },
	/* file_handle */		1,
};