1/* 2 * OpenVPN -- An application to securely tunnel IP networks 3 * over a single TCP/UDP port, with support for SSL/TLS-based 4 * session authentication and key exchange, 5 * packet encryption, packet authentication, and 6 * packet compression. 7 * 8 * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 12 * as published by the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program (see the file COPYING included with this 21 * distribution); if not, write to the Free Software Foundation, Inc., 22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 */ 24 25#ifndef EVENT_H 26#define EVENT_H 27 28#include "win32.h" 29#include "sig.h" 30#include "perf.h" 31 32/* 33 * rwflags passed to event_ctl and returned by 34 * struct event_set_return. 35 */ 36#define EVENT_UNDEF 4 37#define EVENT_READ (1<<0) 38#define EVENT_WRITE (1<<1) 39/* 40 * Initialization flags passed to event_set_init 41 */ 42#define EVENT_METHOD_US_TIMEOUT (1<<0) 43#define EVENT_METHOD_FAST (1<<1) 44 45#ifdef WIN32 46 47typedef const struct rw_handle *event_t; 48 49#define UNDEFINED_EVENT (NULL) 50 51#else 52 53typedef int event_t; 54 55#define UNDEFINED_EVENT (-1) 56 57#endif 58 59struct event_set; 60struct event_set_return; 61 62struct event_set_functions 63{ 64 void (*free)(struct event_set *es); 65 void (*reset)(struct event_set *es); 66 void (*del)(struct event_set *es, event_t event); 67 void (*ctl)(struct event_set *es, event_t event, unsigned int rwflags, void *arg); 68 69 /* 70 * Return status for wait: 71 * -1 on signal or error 72 * 0 on timeout 73 * length of event_set_return if at least 1 event is returned 74 */ 75 int (*wait)(struct event_set *es, const struct timeval *tv, struct event_set_return *out, int outlen); 76}; 77 78struct event_set_return 79{ 80 unsigned int rwflags; 81 void *arg; 82}; 83 84struct event_set 85{ 86 struct event_set_functions func; 87}; 88 89/* 90 * maxevents on input: desired max number of event_t descriptors 91 * simultaneously set with event_ctl 92 * maxevents on output: may be modified down, depending on limitations 93 * of underlying API 94 * flags: EVENT_METHOD_x flags 95 */ 96struct event_set *event_set_init (int *maxevents, unsigned int flags); 97 98static inline void 99event_free (struct event_set *es) 100{ 101 if (es) 102 (*es->func.free)(es); 103} 104 105static inline void 106event_reset (struct event_set *es) 107{ 108 (*es->func.reset)(es); 109} 110 111static inline void 112event_del (struct event_set *es, event_t event) 113{ 114 (*es->func.del)(es, event); 115} 116 117static inline void 118event_ctl (struct event_set *es, event_t event, unsigned int rwflags, void *arg) 119{ 120 (*es->func.ctl)(es, event, rwflags, arg); 121} 122 123static inline int 124event_wait (struct event_set *es, const struct timeval *tv, struct event_set_return *out, int outlen) 125{ 126 int ret; 127 perf_push (PERF_IO_WAIT); 128 ret = (*es->func.wait)(es, tv, out, outlen); 129 perf_pop (); 130 return ret; 131} 132 133static inline void 134event_set_return_init (struct event_set_return *esr) 135{ 136 esr->rwflags = 0; 137 esr->arg = NULL; 138} 139 140#ifdef WIN32 141 142static inline void 143wait_signal (struct event_set *es, void *arg) 144{ 145 if (HANDLE_DEFINED (win32_signal.in.read)) 146 event_ctl (es, &win32_signal.in, EVENT_READ, arg); 147} 148 149#else 150 151static inline void 152wait_signal (struct event_set *es, void *arg) 153{ 154} 155 156#endif 157 158#endif 159