97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
#include <rtthread.h>
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#include <sys/select.h>
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#ifdef RT_USING_LWIP
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int
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select(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset,
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struct timeval *timeout)
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{
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int index, result;
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int sock, maxfd;
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fd_set sock_readset;
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fd_set sock_writeset;
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fd_set sock_exceptset;
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FD_ZERO(&sock_readset);
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FD_ZERO(&sock_writeset);
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FD_ZERO(&sock_exceptset);
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maxfd = 0;
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for (index = 0; index < maxfdp1; index ++)
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{
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if (readset && FD_ISSET(index, readset))
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{
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sock = dfs_lwip_getsocket(index);
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if (sock > maxfd) maxfd = sock;
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FD_SET(sock, &sock_readset);
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}
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if (writeset && FD_ISSET(index, writeset))
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{
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sock = dfs_lwip_getsocket(index);
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if (sock > maxfd) maxfd = sock;
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FD_SET(sock, &sock_writeset);
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}
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if (exceptset && FD_ISSET(index, exceptset))
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{
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sock = dfs_lwip_getsocket(index);
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if (sock > maxfd) maxfd = sock;
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FD_SET(sock, &sock_exceptset);
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}
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}
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if (maxfd == 0) return -EBADF;
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maxfd += 1;
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result = lwip_selscan(maxfd, &sock_readset, &sock_writeset, &sock_exceptset, timeout);
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if (readset) FD_ZERO(readset);
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if (writeset) FD_ZERO(writeset);
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if (exceptset) FD_ZERO(exceptset);
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if (result != -1)
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{
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for (index = 0; index < maxfd; index ++)
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{
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/* check each socket */
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if ((FD_ISSET(index, &sock_readset)) ||
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(FD_ISSET(index, &sock_writeset)) ||
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(FD_ISSET(index, &sock_exceptset)))
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{
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int fd_index;
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/* Because we can not get the corresponding fd, we have to search it one by one */
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for (fd_index = 0; fd_index < maxfdp1; fd_index ++)
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{
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sock = dfs_lwip_getsocket(fd_index);
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if (sock == index) /* found it */
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{
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if (readset && FD_ISSET(index, &sock_readset))
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{
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FD_SET(sock, readset);
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}
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if (writeset && FD_ISSET(index, &sock_writeset))
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{
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FD_SET(sock, writeset);
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}
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if (exceptset && FD_ISSET(index, &sock_exceptset))
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{
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FD_SET(sock, exceptset);
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}
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/* end of search */
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break;
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}
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}
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}
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}
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}
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return result;
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}
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#endif
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