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/*
* 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
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