128 lines
2.9 KiB
C++
128 lines
2.9 KiB
C++
/*
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* IXNetSystem.cpp
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* Author: Korchynskyi Dmytro
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* Copyright (c) 2019 Machine Zone. All rights reserved.
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*/
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#include "IXNetSystem.h"
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namespace ix
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{
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bool initNetSystem()
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{
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#ifdef _WIN32
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WORD wVersionRequested;
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WSADATA wsaData;
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int err;
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// Use the MAKEWORD(lowbyte, highbyte) macro declared in Windef.h
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wVersionRequested = MAKEWORD(2, 2);
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err = WSAStartup(wVersionRequested, &wsaData);
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return err == 0;
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#else
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return true;
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#endif
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}
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bool uninitNetSystem()
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{
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#ifdef _WIN32
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int err = WSACleanup();
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return err == 0;
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#else
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return true;
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#endif
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}
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//
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// That function could 'return WSAPoll(pfd, nfds, timeout);'
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// but WSAPoll is said to have weird behaviors on the internet
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// (the curl folks have had problems with it).
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//
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// So we make it a select wrapper
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//
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int poll(struct pollfd* fds, nfds_t nfds, int timeout)
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{
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#ifdef _WIN32
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socket_t maxfd = 0;
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fd_set readfds, writefds, errorfds;
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FD_ZERO(&readfds);
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FD_ZERO(&writefds);
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FD_ZERO(&errorfds);
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for (nfds_t i = 0; i < nfds; ++i)
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{
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struct pollfd* fd = &fds[i];
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if (fd->fd > maxfd)
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{
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maxfd = fd->fd;
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}
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if ((fd->events & POLLIN))
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{
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FD_SET(fd->fd, &readfds);
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}
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if ((fd->events & POLLOUT))
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{
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FD_SET(fd->fd, &writefds);
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}
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if ((fd->events & POLLERR))
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{
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FD_SET(fd->fd, &errorfds);
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}
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}
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struct timeval tv;
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tv.tv_sec = timeout / 1000;
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tv.tv_usec = (timeout % 1000) * 1000;
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int ret = select(maxfd + 1, &readfds, &writefds, &errorfds, timeout != -1 ? &tv : NULL);
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if (ret < 0)
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{
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return ret;
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}
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for (nfds_t i = 0; i < nfds; ++i)
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{
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struct pollfd* fd = &fds[i];
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fd->revents = 0;
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if (FD_ISSET(fd->fd, &readfds))
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{
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fd->revents |= POLLIN;
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}
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if (FD_ISSET(fd->fd, &writefds))
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{
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fd->revents |= POLLOUT;
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}
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if (FD_ISSET(fd->fd, &errorfds))
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{
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fd->revents |= POLLERR;
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}
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}
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return ret;
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#else
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//
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// It was reported that on Android poll can fail and return -1 with
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// errno == EINTR, which should be a temp error and should typically
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// be handled by retrying in a loop.
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// Maybe we need to put all syscall / C functions in
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// a new IXSysCalls.cpp and wrap them all.
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//
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// The style from libuv is as such.
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//
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int ret = -1;
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do
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{
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ret = ::poll(fds, nfds, timeout);
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} while (ret == -1 && errno == EINTR);
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return ret;
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#endif
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}
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} // namespace ix
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