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/*
* uhub - A tiny ADC p2p connection hub
* Copyright (C) 2007-2010, Jan Vidar Krey
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* 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. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "uhub.h"
#ifdef USE_EPOLL
#include "network/connection.h"
#include "network/common.h"
#include "network/backend.h"
#define EPOLL_EVBUFFER 512
struct net_connection_epoll
{
NET_CON_STRUCT_COMMON
struct epoll_event ev;
};
struct net_backend_epoll
{
int epfd;
struct net_connection_epoll** conns;
struct epoll_event events[EPOLL_EVBUFFER];
struct net_backend_common* common;
};
static void net_backend_set_handlers(struct net_backend_handler* handler);
const char* net_backend_name_epoll()
{
return "epoll";
}
int net_backend_poll_epoll(struct net_backend* data, int ms)
{
struct net_backend_epoll* backend = (struct net_backend_epoll*) data;
int res = epoll_wait(backend->epfd, backend->events, MIN(backend->common->num, EPOLL_EVBUFFER), ms);
if (res == -1 && errno == EINTR)
return 0;
return res;
}
void net_backend_process_epoll(struct net_backend* data, int res)
{
int n, ev;
struct net_backend_epoll* backend = (struct net_backend_epoll*) data;
for (n = 0; n < res; n++)
{
struct net_connection_epoll* con = backend->conns[backend->events[n].data.fd];
if (con)
{
ev = 0;
if (backend->events[n].events & EPOLLIN) ev |= NET_EVENT_READ;
if (backend->events[n].events & EPOLLOUT) ev |= NET_EVENT_WRITE;
net_con_callback((struct net_connection*) con, ev);
}
}
}
struct net_connection* net_con_create_epoll(struct net_backend* data)
{
struct net_connection* con = (struct net_connection*) hub_malloc_zero(sizeof(struct net_connection_epoll));
con->sd = -1;
return con;
}
void net_con_initialize_epoll(struct net_backend* data, struct net_connection* con_, int sd, net_connection_cb callback, const void* ptr)
{
struct net_connection_epoll* con = (struct net_connection_epoll*) con_;
con->sd = sd;
con->flags = 0;
con->callback = callback;
con->ev.events = 0;
con->ptr = (void*) ptr;
con->ev.data.fd = sd;
}
void net_con_backend_add_epoll(struct net_backend* data, struct net_connection* con_, int events)
{
struct net_backend_epoll* backend = (struct net_backend_epoll*) data;
struct net_connection_epoll* con = (struct net_connection_epoll*) con_;
backend->conns[con->sd] = con;
if (events & NET_EVENT_READ) con->ev.events |= EPOLLIN;
if (events & NET_EVENT_WRITE) con->ev.events |= EPOLLOUT;
if (epoll_ctl(backend->epfd, EPOLL_CTL_ADD, con->sd, &con->ev) == -1)
{
LOG_TRACE("epoll_ctl() add failed.");
}
}
void net_con_backend_mod_epoll(struct net_backend* data, struct net_connection* con_, int events)
{
struct net_backend_epoll* backend = (struct net_backend_epoll*) data;
struct net_connection_epoll* con = (struct net_connection_epoll*) con_;
int newev = 0;
if (events & NET_EVENT_READ) newev |= EPOLLIN;
if (events & NET_EVENT_WRITE) newev |= EPOLLOUT;
if (newev == con->ev.events)
return;
con->ev.events = newev;
if (epoll_ctl(backend->epfd, EPOLL_CTL_MOD, con->sd, &con->ev) == -1)
{
LOG_TRACE("epoll_ctl() modify failed.");
}
}
void net_con_backend_del_epoll(struct net_backend* data, struct net_connection* con_)
{
struct net_backend_epoll* backend = (struct net_backend_epoll*) data;
struct net_connection_epoll* con = (struct net_connection_epoll*) con_;
backend->conns[con->sd] = 0;
if (epoll_ctl(backend->epfd, EPOLL_CTL_DEL, con->sd, &con->ev) == -1)
{
LOG_WARN("epoll_ctl() delete failed.");
}
}
void net_backend_shutdown_epoll(struct net_backend* data)
{
struct net_backend_epoll* backend = (struct net_backend_epoll*) data;
close(backend->epfd);
hub_free(backend->conns);
hub_free(backend);
}
struct net_backend* net_backend_init_epoll(struct net_backend_handler* handler, struct net_backend_common* common)
{
struct net_backend_epoll* backend;
if (getenv("EVENT_NOEPOLL"))
return 0;
backend = hub_malloc_zero(sizeof(struct net_backend_epoll));
backend->epfd = epoll_create(common->max);
if (backend->epfd == -1)
{
LOG_WARN("Unable to create epoll socket.");
hub_free(backend);
return 0;
}
backend->conns = hub_malloc_zero(sizeof(struct net_connection_epoll*) * common->max);
backend->common = common;
net_backend_set_handlers(handler);
return (struct net_backend*) backend;
}
static void net_backend_set_handlers(struct net_backend_handler* handler)
{
handler->backend_name = net_backend_name_epoll;
handler->backend_poll = net_backend_poll_epoll;
handler->backend_process = net_backend_process_epoll;
handler->backend_shutdown = net_backend_shutdown_epoll;
handler->con_create = net_con_create_epoll;
handler->con_init = net_con_initialize_epoll;
handler->con_add = net_con_backend_add_epoll;
handler->con_mod = net_con_backend_mod_epoll;
handler->con_del = net_con_backend_del_epoll;
}
#endif /* USE_EPOLL */
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