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/*
* File : lwip_select.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2015, RT-Thread Development Team
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2015-05-05 Bernard First version
*/
#include <rtthread.h>
#include <sys/select.h>
#ifdef RT_USING_LWIP
#include "dfs_net.h"
int
select(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset,
struct timeval *timeout)
{
int index, result;
int sock, maxfd;
fd_set sock_readset;
fd_set sock_writeset;
fd_set sock_exceptset;
FD_ZERO(&sock_readset);
FD_ZERO(&sock_writeset);
FD_ZERO(&sock_exceptset);
maxfd = 0;
for (index = 0; index < maxfdp1; index ++)
{
/* convert fd to sock */
sock = dfs_net_getsocket(index);
if (sock == -1) continue;
if (sock > maxfd) maxfd = sock;
/* if FD is set, set the socket set */
if (readset && FD_ISSET(index, readset))
{
FD_SET(sock, &sock_readset);
}
if (writeset && FD_ISSET(index, writeset))
{
FD_SET(sock, &sock_writeset);
}
if (exceptset && FD_ISSET(index, exceptset))
{
FD_SET(sock, &sock_exceptset);
}
}
/* no socket found, return bad file descriptor */
if (maxfd == 0) return -EBADF;
maxfd += 1;
result = lwip_select(maxfd, &sock_readset, &sock_writeset, &sock_exceptset, timeout);
if (readset) FD_ZERO(readset);
if (writeset) FD_ZERO(writeset);
if (exceptset) FD_ZERO(exceptset);
if (result != -1)
{
for (index = 0; index < maxfd; index ++)
{
/* check each socket */
if ((FD_ISSET(index, &sock_readset)) ||
(FD_ISSET(index, &sock_writeset)) ||
(FD_ISSET(index, &sock_exceptset)))
{
int fd_index;
/* Because we can not get the corresponding fd, we have to search it one by one */
for (fd_index = 0; fd_index < maxfdp1; fd_index ++)
{
sock = dfs_lwip_getsocket(fd_index);
if (sock == index) /* found it */
{
if (readset && FD_ISSET(index, &sock_readset))
{
FD_SET(sock, readset);
}
if (writeset && FD_ISSET(index, &sock_writeset))
{
FD_SET(sock, writeset);
}
if (exceptset && FD_ISSET(index, &sock_exceptset))
{
FD_SET(sock, exceptset);
}
/* end of search */
break;
}
}
}
}
}
return result;
}
RTM_EXPORT(select);
#endif
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