| 1 | /*
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| 2 | * poll.c
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| 3 | *
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| 4 | * Copyright (c) 1997-8 Graham Barr <gbarr@pobox.com>. All rights reserved.
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| 5 | * This program is free software; you can redistribute it and/or
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| 6 | * modify it under the same terms as Perl itself.
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| 7 | *
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| 8 | * For systems that do not have the poll() system call (for example Linux
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| 9 | * kernels < v2.1.23) try to emulate it as closely as possible using select()
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| 10 | *
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| 11 | */
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| 12 |
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| 13 | #include "EXTERN.h"
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| 14 | #include "perl.h"
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| 15 | #include "XSUB.h"
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| 16 |
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| 17 | #include "poll.h"
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| 18 | #ifdef I_SYS_TIME
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| 19 | # include <sys/time.h>
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| 20 | #endif
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| 21 | #ifdef I_TIME
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| 22 | # include <time.h>
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| 23 | #endif
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| 24 | #include <sys/types.h>
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| 25 | #if defined(HAS_SOCKET) && !defined(VMS) && !defined(ultrix) /* VMS handles sockets via vmsish.h, ULTRIX dies of socket struct redefinitions */
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| 26 | # include <sys/socket.h>
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| 27 | #endif
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| 28 | #include <sys/stat.h>
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| 29 | #include <errno.h>
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| 30 |
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| 31 | #ifdef HAS_SELECT
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| 32 | #ifdef I_SYS_SELECT
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| 33 | #include <sys/select.h>
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| 34 | #endif
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| 35 | #endif
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| 36 |
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| 37 | #ifdef EMULATE_POLL_WITH_SELECT
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| 38 |
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| 39 | # define POLL_CAN_READ (POLLIN | POLLRDNORM )
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| 40 | # define POLL_CAN_WRITE (POLLOUT | POLLWRNORM | POLLWRBAND )
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| 41 | # define POLL_HAS_EXCP (POLLRDBAND | POLLPRI )
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| 42 |
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| 43 | # define POLL_EVENTS_MASK (POLL_CAN_READ | POLL_CAN_WRITE | POLL_HAS_EXCP)
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| 44 |
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| 45 | int
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| 46 | poll(struct pollfd *fds, unsigned long nfds, int timeout)
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| 47 | {
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| 48 | int i,err;
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| 49 | fd_set rfd,wfd,efd,ifd;
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| 50 | struct timeval timebuf;
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| 51 | struct timeval *tbuf = (struct timeval *)0;
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| 52 | int n = 0;
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| 53 | int count;
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| 54 |
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| 55 | FD_ZERO(&ifd);
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| 56 |
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| 57 | again:
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| 58 |
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| 59 | FD_ZERO(&rfd);
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| 60 | FD_ZERO(&wfd);
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| 61 | FD_ZERO(&efd);
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| 62 |
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| 63 | for(i = 0 ; i < (int)nfds ; i++) {
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| 64 | int events = fds[i].events;
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| 65 | int fd = fds[i].fd;
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| 66 |
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| 67 | fds[i].revents = 0;
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| 68 |
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| 69 | if(fd < 0 || FD_ISSET(fd, &ifd))
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| 70 | continue;
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| 71 |
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| 72 | if(fd > n)
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| 73 | n = fd;
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| 74 |
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| 75 | if(events & POLL_CAN_READ)
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| 76 | FD_SET(fd, &rfd);
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| 77 |
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| 78 | if(events & POLL_CAN_WRITE)
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| 79 | FD_SET(fd, &wfd);
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| 80 |
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| 81 | if(events & POLL_HAS_EXCP)
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| 82 | FD_SET(fd, &efd);
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| 83 | }
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| 84 |
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| 85 | if(timeout >= 0) {
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| 86 | timebuf.tv_sec = timeout / 1000;
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| 87 | timebuf.tv_usec = (timeout % 1000) * 1000;
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| 88 | tbuf = &timebuf;
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| 89 | }
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| 90 |
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| 91 | err = select(n+1,&rfd,&wfd,&efd,tbuf);
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| 92 |
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| 93 | if(err < 0) {
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| 94 | #ifdef HAS_FSTAT
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| 95 | if(errno == EBADF) {
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| 96 | for(i = 0 ; i < nfds ; i++) {
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| 97 | struct stat buf;
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| 98 | if((fstat(fds[i].fd,&buf) < 0) && (errno == EBADF)) {
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| 99 | FD_SET(fds[i].fd, &ifd);
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| 100 | goto again;
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| 101 | }
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| 102 | }
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| 103 | }
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| 104 | #endif /* HAS_FSTAT */
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| 105 | return err;
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| 106 | }
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| 107 |
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| 108 | count = 0;
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| 109 |
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| 110 | for(i = 0 ; i < (int)nfds ; i++) {
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| 111 | int revents = (fds[i].events & POLL_EVENTS_MASK);
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| 112 | int fd = fds[i].fd;
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| 113 |
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| 114 | if(fd < 0)
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| 115 | continue;
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| 116 |
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| 117 | if(FD_ISSET(fd, &ifd))
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| 118 | revents = POLLNVAL;
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| 119 | else {
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| 120 | if(!FD_ISSET(fd, &rfd))
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| 121 | revents &= ~POLL_CAN_READ;
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| 122 |
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| 123 | if(!FD_ISSET(fd, &wfd))
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| 124 | revents &= ~POLL_CAN_WRITE;
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| 125 |
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| 126 | if(!FD_ISSET(fd, &efd))
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| 127 | revents &= ~POLL_HAS_EXCP;
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| 128 | }
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| 129 |
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| 130 | if((fds[i].revents = revents) != 0)
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| 131 | count++;
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| 132 | }
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| 133 |
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| 134 | return count;
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| 135 | }
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| 136 |
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| 137 | #endif /* EMULATE_POLL_WITH_SELECT */
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| 138 |
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| 139 | /* gcc for SunOS 4 produces code from an empty (code/symbolwise)
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| 140 | * source code file that makes the SunOS 4.x /usr/bin/ld fail with
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| 141 | * ld: poll.o: premature EOF
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| 142 | * To avoid this, have at least something in here. */
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| 143 | #if defined(__sun) && !defined(__SVR4) && defined(__GNUC__)
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| 144 | static int dummy;
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| 145 | #endif
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| 146 |
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