uhub/src/network/select.c

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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_SELECT
#include "network/connection.h"
#include "network/common.h"
#include "network/backend.h"
struct net_connection_select
{
NET_CON_STRUCT_COMMON
};
struct net_backend_select
{
struct net_connection_select** conns;
fd_set rfds;
fd_set wfds;
int maxfd;
struct net_backend_common* common;
};
static void net_backend_set_handlers(struct net_backend_handler* handler);
const char* net_backend_name_select()
{
return "select";
}
int net_backend_poll_select(struct net_backend* data, int ms)
{
int found, res, n;
struct timeval tval;
struct net_backend_select* backend = (struct net_backend_select*) data;
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tval.tv_sec = ms / 1000;
tval.tv_usec = ((ms % 1000) * 1000); // FIXME: correct?
FD_ZERO(&backend->rfds);
FD_ZERO(&backend->wfds);
backend->maxfd = -1;
for (n = 0, found = 0; found < backend->common->num && n < backend->common->max; n++)
{
struct net_connection_select* con = backend->conns[n];
if (con)
{
if (con->flags & NET_EVENT_READ) FD_SET(con->sd, &backend->rfds);
if (con->flags & NET_EVENT_WRITE) FD_SET(con->sd, &backend->wfds);
found++;
backend->maxfd = con->sd;
}
}
backend->maxfd++;
res = select(backend->maxfd, &backend->rfds, &backend->wfds, 0, &tval);
if (res == -1 && errno == EINTR)
return 0;
return res;
}
void net_backend_process_select(struct net_backend* data, int res)
{
int n, found;
struct net_backend_select* backend = (struct net_backend_select*) data;
for (n = 0, found = 0; found < res && n < backend->maxfd; n++)
{
struct net_connection_select* con = backend->conns[n];
if (con)
{
int ev = 0;
if (FD_ISSET(con->sd, &backend->rfds)) ev |= NET_EVENT_READ;
if (FD_ISSET(con->sd, &backend->wfds)) ev |= NET_EVENT_WRITE;
if (ev)
{
net_con_callback((struct net_connection*) con, ev);
found++;
}
}
}
}
struct net_connection* net_con_create_select(struct net_backend* data)
{
struct net_connection* con = (struct net_connection*) hub_malloc_zero(sizeof(struct net_connection_select));
con->sd = -1;
return con;
}
void net_con_initialize_select(struct net_backend* data, struct net_connection* con_, int sd, net_connection_cb callback, const void* ptr)
{
struct net_connection_select* con = (struct net_connection_select*) con_;
con->sd = sd;
con->flags = 0;
con->callback = callback;
con->ptr = (void*) ptr;
}
void net_con_backend_add_select(struct net_backend* data, struct net_connection* con, int events)
{
struct net_backend_select* backend = (struct net_backend_select*) data;
backend->conns[con->sd] = (struct net_connection_select*) con;
}
void net_con_backend_mod_select(struct net_backend* data, struct net_connection* con, int events)
{
con->flags |= (events & (NET_EVENT_READ | NET_EVENT_WRITE));;
}
void net_con_backend_del_select(struct net_backend* data, struct net_connection* con)
{
struct net_backend_select* backend = (struct net_backend_select*) data;
backend->conns[con->sd] = 0;
}
void net_backend_shutdown_select(struct net_backend* data)
{
struct net_backend_select* backend = (struct net_backend_select*) data;
hub_free(backend->conns);
hub_free(backend);
}
struct net_backend* net_backend_init_select(struct net_backend_handler* handler, struct net_backend_common* common)
{
struct net_backend_select* backend;
if (getenv("EVENT_NOSELECT"))
return 0;
backend = hub_malloc_zero(sizeof(struct net_backend_select));
FD_ZERO(&backend->rfds);
FD_ZERO(&backend->wfds);
backend->conns = hub_malloc_zero(sizeof(struct net_connection_select*) * common->max);
backend->common = common;
net_backend_set_handlers(handler);
return (struct net_backend*) backend;
}
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static void net_backend_set_handlers(struct net_backend_handler* handler)
{
handler->backend_name = net_backend_name_select;
handler->backend_poll = net_backend_poll_select;
handler->backend_process = net_backend_process_select;
handler->backend_shutdown = net_backend_shutdown_select;
handler->con_create = net_con_create_select;
handler->con_init = net_con_initialize_select;
handler->con_add = net_con_backend_add_select;
handler->con_mod = net_con_backend_mod_select;
handler->con_del = net_con_backend_del_select;
}
#endif /* USE_SELECT */