21 int poll(struct pollfd *fds, nfds_t nfds, int timeout)  in poll()  argument
35     if (fds == NULL) {  in poll()
45         fds[i].revents = 0;  in poll()
47         if (fds[i].fd < 0) {  in poll()
52         if (fds[i].fd >= FD_SETSIZE) {  in poll()
53             fds[i].revents |= POLLNVAL;  in poll()
58         if (fds[i].events & (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {  in poll()
59             FD_SET(fds[i].fd, &readfds);  in poll()
60             FD_SET(fds[i].fd, &errorfds);  in poll()
61             max_fd = MAX(max_fd, fds[i].fd);  in poll()
64         if (fds[i].events & (POLLOUT | POLLWRNORM | POLLWRBAND)) {  in poll()
65             FD_SET(fds[i].fd, &writefds);  in poll()
66             FD_SET(fds[i].fd, &errorfds);  in poll()
67             max_fd = MAX(max_fd, fds[i].fd);  in poll()
77             if (FD_ISSET(fds[i].fd, &readfds)) {  in poll()
78                 fds[i].revents |= POLLIN;  in poll()
81             if (FD_ISSET(fds[i].fd, &writefds)) {  in poll()
82                 fds[i].revents |= POLLOUT;  in poll()
85             if (FD_ISSET(fds[i].fd, &errorfds)) {  in poll()
86                 fds[i].revents |= POLLERR;  in poll()