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/* Copyright (c) 2003-2004, Roger Dingledine
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file alertsock.h
*
* \brief Header for alertsock.c
**/
#ifndef TOR_ALERTSOCK_H
#define TOR_ALERTSOCK_H
#include "orconfig.h"
#include "lib/net/nettypes.h"
#include "lib/cc/torint.h"
/** Helper type used to manage waking up the main thread while it's in
* the libevent main loop. Used by the work queue code. */
typedef struct alert_sockets_t {
/* XXXX This structure needs a better name. */
/** Socket that the main thread should listen for EV_READ events on.
* Note that this socket may be a regular fd on a non-Windows platform.
*/
tor_socket_t read_fd;
/** Socket to use when alerting the main thread. */
tor_socket_t write_fd;
/** Function to alert the main thread */
int (*alert_fn)(tor_socket_t write_fd);
/** Function to make the main thread no longer alerted. */
int (*drain_fn)(tor_socket_t read_fd);
} alert_sockets_t;
/* Flags to disable one or more alert_sockets backends. */
#define ASOCKS_NOEVENTFD2 (1u<<0)
#define ASOCKS_NOEVENTFD (1u<<1)
#define ASOCKS_NOPIPE2 (1u<<2)
#define ASOCKS_NOPIPE (1u<<3)
#define ASOCKS_NOSOCKETPAIR (1u<<4)
int alert_sockets_create(alert_sockets_t *socks_out, uint32_t flags);
void alert_sockets_close(alert_sockets_t *socks);
#endif /* !defined(TOR_ALERTSOCK_H) */
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