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/*
* Copyright (C) 2010-2011 Mamadou Diop.
*
* Contact: Mamadou Diop <diopmamadou(at)doubango[dot]org>
*
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO 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.
*
* DOUBANGO 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 DOUBANGO.
*
*/
#include "tnet_poll.h"
#if USE_POLL && (!HAVE_POLL || !HAVE_POLL_H)
/**
*
* @brief poll() method implementation for multiplexing network sockets.
*
* @param fds An array of pollfd structures.
* @param nfds The number of file descriptors set in fds[ ].
* @param timeout How long poll() should wait for an event to occur (in milliseconds).
*
* @return The number of elements in fdarray for which an revents member of the POLLFD structure is nonzero.
* If the the returned value if <0 this mean that error occurred.
**/
int tnet_poll(tnet_pollfd_t fds[ ], tnet_nfds_t nfds, int timeout)
{
tsk_size_t i;
int ret;
int highest_fd = -1;
fd_set readfds;
fd_set writefds;
fd_set exceptfds;
struct timeval timetowait;
/*
* cleanup fd_sets
*/
FD_ZERO(&readfds);
FD_ZERO(&writefds);
FD_ZERO(&exceptfds);
/*
* set timeout
*/
if(timeout >=0) {
timetowait.tv_sec = (timeout/1000);
timetowait.tv_usec = (timeout%1000) * 1000;
}
/*
* add descriptors to the fd_sets
*/
for(i = 0; i<nfds; i++) {
if(fds[i].fd != TNET_INVALID_FD) {
if(fds[i].events & TNET_POLLIN) {
FD_SET(fds[i].fd, &readfds);
}
if(fds[i].events & TNET_POLLOUT) {
FD_SET(fds[i].fd, &writefds);
}
if(fds[i].events & TNET_POLLPRI) {
FD_SET(fds[i].fd, &exceptfds);
}
}
highest_fd = (highest_fd < fds[i].fd) ? fds[i].fd : highest_fd;
}
/*======================================
* select
*/
if((ret = select(highest_fd + 1, &readfds, &writefds, &exceptfds, (timeout >=0) ? &timetowait : 0)) >= 0) {
for(i = 0; i<nfds; i++) {
if(fds[i].fd != TNET_INVALID_FD) {
fds[i].revents = 0;
if(FD_ISSET(fds[i].fd, &readfds)) {
fds[i].revents |= TNET_POLLIN;
}
if(FD_ISSET(fds[i].fd, &writefds)) {
fds[i].revents |= TNET_POLLOUT;
}
if(FD_ISSET(fds[i].fd, &exceptfds)) {
fds[i].revents |= TNET_POLLPRI;
}
}
}
}
return ret;
}
#endif /* TNET_USE_POLL */
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