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https://gitlab.torproject.org/tpo/core/tor.git
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93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
/*
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* fakepoll.c
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*
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* On systems where 'poll' doesn't exist, fake it with 'select'.
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*
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* Nick Mathewson <nickm@freehaven.net>
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*/
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#include "orconfig.h"
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#include "fakepoll.h"
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#ifdef USE_FAKE_POLL
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#include <sys/types.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#if _MSC_VER > 1300
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#elif defined(_MSC_VER)
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#include <winsock.h>
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#endif
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#include "util.h"
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int
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poll(struct pollfd *ufds, unsigned int nfds, int timeout)
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{
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unsigned int idx, maxfd, fd;
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int r;
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#ifdef MS_WINDOWS
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int any_fds_set = 0;
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#endif
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fd_set readfds, writefds, exceptfds;
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#ifdef USING_FAKE_TIMEVAL
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#undef timeval
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#undef tv_sec
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#undef tv_usec
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#endif
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struct timeval _timeout;
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_timeout.tv_sec = timeout/1000;
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_timeout.tv_usec = (timeout%1000)*1000;
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FD_ZERO(&readfds);
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FD_ZERO(&writefds);
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FD_ZERO(&exceptfds);
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maxfd = -1;
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for (idx = 0; idx < nfds; ++idx) {
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fd = ufds[idx].fd;
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if (ufds[idx].events) {
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if (fd > maxfd)
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maxfd = fd;
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#ifdef MS_WINDOWS
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any_fds_set = 1;
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#endif
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}
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if (ufds[idx].events & POLLIN)
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FD_SET(fd, &readfds);
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if (ufds[idx].events & POLLOUT)
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FD_SET(fd, &writefds);
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if (ufds[idx].events & POLLERR)
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FD_SET(fd, &exceptfds);
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}
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#ifdef MS_WINDOWS
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if (!any_fds_set) {
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Sleep(timeout);
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return 0;
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}
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#endif
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r = select(maxfd+1, &readfds, &writefds, &exceptfds,
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timeout == -1 ? NULL : &_timeout);
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if (r <= 0)
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return r;
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r = 0;
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for (idx = 0; idx < nfds; ++idx) {
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fd = ufds[idx].fd;
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ufds[idx].revents = 0;
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if (FD_ISSET(fd, &readfds))
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ufds[idx].revents |= POLLIN;
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if (FD_ISSET(fd, &writefds))
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ufds[idx].revents |= POLLOUT;
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if (FD_ISSET(fd, &exceptfds))
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ufds[idx].revents |= POLLERR;
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if (ufds[idx].revents)
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++r;
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}
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return r;
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}
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#endif
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