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Diffstat (limited to 'event.h')
| -rw-r--r-- | event.h | 158 |
1 files changed, 158 insertions, 0 deletions
@@ -0,0 +1,158 @@ +/* + * OpenVPN -- An application to securely tunnel IP networks + * over a single TCP/UDP port, with support for SSL/TLS-based + * session authentication and key exchange, + * packet encryption, packet authentication, and + * packet compression. + * + * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program (see the file COPYING included with this + * distribution); if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef EVENT_H +#define EVENT_H + +#include "win32.h" +#include "sig.h" +#include "perf.h" + +/* + * rwflags passed to event_ctl and returned by + * struct event_set_return. + */ +#define EVENT_UNDEF 4 +#define EVENT_READ (1<<0) +#define EVENT_WRITE (1<<1) +/* + * Initialization flags passed to event_set_init + */ +#define EVENT_METHOD_US_TIMEOUT (1<<0) +#define EVENT_METHOD_FAST (1<<1) + +#ifdef WIN32 + +typedef const struct rw_handle *event_t; + +#define UNDEFINED_EVENT (NULL) + +#else + +typedef int event_t; + +#define UNDEFINED_EVENT (-1) + +#endif + +struct event_set; +struct event_set_return; + +struct event_set_functions +{ + void (*free)(struct event_set *es); + void (*reset)(struct event_set *es); + void (*del)(struct event_set *es, event_t event); + void (*ctl)(struct event_set *es, event_t event, unsigned int rwflags, void *arg); + + /* + * Return status for wait: + * -1 on signal or error + * 0 on timeout + * length of event_set_return if at least 1 event is returned + */ + int (*wait)(struct event_set *es, const struct timeval *tv, struct event_set_return *out, int outlen); +}; + +struct event_set_return +{ + unsigned int rwflags; + void *arg; +}; + +struct event_set +{ + struct event_set_functions func; +}; + +/* + * maxevents on input: desired max number of event_t descriptors + * simultaneously set with event_ctl + * maxevents on output: may be modified down, depending on limitations + * of underlying API + * flags: EVENT_METHOD_x flags + */ +struct event_set *event_set_init (int *maxevents, unsigned int flags); + +static inline void +event_free (struct event_set *es) +{ + if (es) + (*es->func.free)(es); +} + +static inline void +event_reset (struct event_set *es) +{ + (*es->func.reset)(es); +} + +static inline void +event_del (struct event_set *es, event_t event) +{ + (*es->func.del)(es, event); +} + +static inline void +event_ctl (struct event_set *es, event_t event, unsigned int rwflags, void *arg) +{ + (*es->func.ctl)(es, event, rwflags, arg); +} + +static inline int +event_wait (struct event_set *es, const struct timeval *tv, struct event_set_return *out, int outlen) +{ + int ret; + perf_push (PERF_IO_WAIT); + ret = (*es->func.wait)(es, tv, out, outlen); + perf_pop (); + return ret; +} + +static inline void +event_set_return_init (struct event_set_return *esr) +{ + esr->rwflags = 0; + esr->arg = NULL; +} + +#ifdef WIN32 + +static inline void +wait_signal (struct event_set *es, void *arg) +{ + if (HANDLE_DEFINED (win32_signal.in.read)) + event_ctl (es, &win32_signal.in, EVENT_READ, arg); +} + +#else + +static inline void +wait_signal (struct event_set *es, void *arg) +{ +} + +#endif + +#endif |