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62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
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/*
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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 "fakepoll.h"
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#ifdef USE_FAKE_POLL
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <string.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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int idx, maxfd, fd, r;
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fd_set readfds, writefds, exceptfds;
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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 (fd > maxfd && ufds[idx].events)
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maxfd = fd;
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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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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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