From: Arun Thomas Date: Mon, 26 Jul 2010 20:46:04 +0000 (+0000) Subject: Import poll() from NetBSD's libnbcompat X-Git-Tag: v3.1.8~138 X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/expt.png?a=commitdiff_plain;h=ee1cabf06cc5147459eaf40f83287598bc6a7db0;p=minix.git Import poll() from NetBSD's libnbcompat --- diff --git a/include/sys/Makefile b/include/sys/Makefile index e53387b25..b95b2ce9d 100644 --- a/include/sys/Makefile +++ b/include/sys/Makefile @@ -9,6 +9,6 @@ INCS= asynchio.h dir.h file.h ioc_cmos.h ioc_disk.h \ select.h sem.h shm.h sigcontext.h signal.h socket.h \ soundcard.h statfs.h statvfs.h stat.h svrctl.h timeb.h \ time.h times.h types.h ucontext.h ucred.h uio.h un.h \ - utsname.h video.h vm.h wait.h cdefs.h null.h + utsname.h video.h vm.h wait.h cdefs.h null.h poll.h .include diff --git a/include/sys/poll.h b/include/sys/poll.h new file mode 100644 index 000000000..7c57e937c --- /dev/null +++ b/include/sys/poll.h @@ -0,0 +1,67 @@ +/* $NetBSD: poll.h,v 1.3 2008/04/29 05:46:08 martin Exp $ */ + +/*- + * Copyright (c) 1998 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Charles M. Hannum. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _NBCOMPAT_POLL_H_ +#define _NBCOMPAT_POLL_H_ + +#include + +typedef unsigned int nfds_t; + +struct pollfd { + int fd; /* file descriptor */ + short events; /* events to look for */ + short revents; /* events returned */ +}; + +/* + * Testable events (may be specified in events field). + */ +#define POLLIN 0x0001 +#define POLLPRI 0x0002 +#define POLLOUT 0x0004 +#define POLLRDNORM 0x0040 +#define POLLWRNORM POLLOUT +#define POLLRDBAND 0x0080 +#define POLLWRBAND 0x0100 + +/* + * Non-testable events (may not be specified in events field). + */ +#define POLLERR 0x0008 +#define POLLHUP 0x0010 +#define POLLNVAL 0x0020 + +__BEGIN_DECLS +int poll (struct pollfd *, nfds_t, int); +__END_DECLS + +#endif /* !_NBCOMPAT_POLL_H_ */ diff --git a/lib/libc/posix/Makefile.inc b/lib/libc/posix/Makefile.inc index cb5b007cf..e5d5bf907 100644 --- a/lib/libc/posix/Makefile.inc +++ b/lib/libc/posix/Makefile.inc @@ -110,4 +110,5 @@ SRCS+= \ priority.c \ pread.c \ pwrite.c \ - usleep.c + usleep.c \ + poll.c diff --git a/lib/libc/posix/poll.c b/lib/libc/posix/poll.c new file mode 100644 index 000000000..bd99b9529 --- /dev/null +++ b/lib/libc/posix/poll.c @@ -0,0 +1,94 @@ +/* $NetBSD: poll.c,v 1.3 2008/04/29 05:46:08 martin Exp $ */ + +/*- + * Copyright (c) 2003 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Charles Blundell. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include +#include +#include +#include +#include + +int +poll(struct pollfd *p, nfds_t nfds, int timout) +{ + fd_set read, write, except; + struct timeval tv; + nfds_t i; + int highfd, rval; + + /* + * select cannot tell us much wrt POLL*BAND, POLLPRI, POLLHUP or + * POLLNVAL. + */ + FD_ZERO(&read); + FD_ZERO(&write); + FD_ZERO(&except); + + highfd = -1; + for (i = 0; i < nfds; i++) { + if (p[i].fd < 0) + continue; + if (p[i].fd >= FD_SETSIZE) { + errno = EINVAL; + return -1; + } + if (p[i].fd > highfd) + highfd = p[i].fd; + + if (p[i].events & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI)) + FD_SET(p[i].fd, &read); + if (p[i].events & (POLLOUT|POLLWRNORM|POLLWRBAND)) + FD_SET(p[i].fd, &write); + FD_SET(p[i].fd, &except); + } + + tv.tv_sec = timout / 1000; + tv.tv_usec = (timout % 1000) * 1000; + + rval = select(highfd + 1, &read, &write, &except, + timout == -1 ? NULL : &tv); + if (rval <= 0) + return rval; + + rval = 0; + for (i = 0; i < nfds; i++) { + p[i].revents = 0; + if (FD_ISSET(p[i].fd, &read)) + p[i].revents |= POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI; + if (FD_ISSET(p[i].fd, &write)) + p[i].revents |= POLLOUT|POLLWRNORM|POLLWRBAND; + if (FD_ISSET(p[i].fd, &except)) + p[i].revents |= POLLERR; + /* XXX: POLLHUP/POLLNVAL? */ + if (p[i].revents != 0) + rval++; + } + return rval; +}