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root |
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/* |
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* poll.c |
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* |
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* Copyright (c) 1997-8 Graham Barr <gbarr@pobox.com>. All rights reserved. |
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* This program is free software; you can redistribute it and/or |
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* modify it under the same terms as Perl itself. |
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* |
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* For systems that do not have the poll() system call (for example Linux |
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* kernels < v2.1.23) try to emulate it as closely as possible using select() |
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* |
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*/ |
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#include "EXTERN.h" |
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#include "perl.h" |
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#include "XSUB.h" |
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#include "poll.h" |
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#ifdef I_SYS_TIME |
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# include <sys/time.h> |
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#endif |
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#ifdef I_TIME |
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# include <time.h> |
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#endif |
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#include <sys/types.h> |
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#if defined(HAS_SOCKET) && !defined(VMS) && !defined(ultrix) /* VMS handles sockets via vmsish.h, ULTRIX dies of socket struct redefinitions */ |
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# include <sys/socket.h> |
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#endif |
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#include <sys/stat.h> |
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#include <errno.h> |
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#ifdef HAS_SELECT |
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#ifdef I_SYS_SELECT |
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#include <sys/select.h> |
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#endif |
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#endif |
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#ifdef EMULATE_POLL_WITH_SELECT |
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# define POLL_CAN_READ (POLLIN | POLLRDNORM ) |
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# define POLL_CAN_WRITE (POLLOUT | POLLWRNORM | POLLWRBAND ) |
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# define POLL_HAS_EXCP (POLLRDBAND | POLLPRI ) |
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# define POLL_EVENTS_MASK (POLL_CAN_READ | POLL_CAN_WRITE | POLL_HAS_EXCP) |
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int |
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poll(struct pollfd *fds, unsigned long nfds, int timeout) |
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{ |
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int i,err; |
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fd_set rfd,wfd,efd,ifd; |
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struct timeval timebuf; |
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struct timeval *tbuf = (struct timeval *)0; |
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int n = 0; |
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int count; |
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FD_ZERO(&ifd); |
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again: |
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FD_ZERO(&rfd); |
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FD_ZERO(&wfd); |
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FD_ZERO(&efd); |
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for(i = 0 ; i < (int)nfds ; i++) { |
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int events = fds[i].events; |
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int fd = fds[i].fd; |
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fds[i].revents = 0; |
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if(fd < 0 || FD_ISSET(fd, &ifd)) |
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continue; |
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if(fd > n) |
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n = fd; |
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if(events & POLL_CAN_READ) |
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FD_SET(fd, &rfd); |
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if(events & POLL_CAN_WRITE) |
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FD_SET(fd, &wfd); |
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if(events & POLL_HAS_EXCP) |
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FD_SET(fd, &efd); |
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} |
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if(timeout >= 0) { |
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timebuf.tv_sec = timeout / 1000; |
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timebuf.tv_usec = (timeout % 1000) * 1000; |
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tbuf = &timebuf; |
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} |
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err = select(n+1,&rfd,&wfd,&efd,tbuf); |
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if(err < 0) { |
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#ifdef HAS_FSTAT |
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if(errno == EBADF) { |
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for(i = 0 ; i < nfds ; i++) { |
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struct stat buf; |
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if((fstat(fds[i].fd,&buf) < 0) && (errno == EBADF)) { |
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FD_SET(fds[i].fd, &ifd); |
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goto again; |
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} |
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} |
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} |
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#endif /* HAS_FSTAT */ |
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return err; |
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} |
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count = 0; |
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for(i = 0 ; i < (int)nfds ; i++) { |
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int revents = (fds[i].events & POLL_EVENTS_MASK); |
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int fd = fds[i].fd; |
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if(fd < 0) |
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continue; |
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if(FD_ISSET(fd, &ifd)) |
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revents = POLLNVAL; |
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else { |
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if(!FD_ISSET(fd, &rfd)) |
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revents &= ~POLL_CAN_READ; |
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if(!FD_ISSET(fd, &wfd)) |
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revents &= ~POLL_CAN_WRITE; |
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if(!FD_ISSET(fd, &efd)) |
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revents &= ~POLL_HAS_EXCP; |
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} |
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if((fds[i].revents = revents) != 0) |
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count++; |
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} |
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return count; |
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} |
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#endif /* EMULATE_POLL_WITH_SELECT */ |
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/* gcc for SunOS 4 produces code from an empty (code/symbolwise) |
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* source code file that makes the SunOS 4.x /usr/bin/ld fail with |
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* ld: poll.o: premature EOF |
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* To avoid this, have at least something in here. */ |
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#if defined(__sun) && !defined(__SVR4) && defined(__GNUC__) |
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static int dummy; |
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#endif |
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