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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [poll.h] - Rev 30
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/*- * Copyright (c) 1997 Peter Wemm <peter@freebsd.org> * All rights reserved. * * 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. * * $Id: poll.h,v 1.2 2001-09-27 12:01:48 chris Exp $ */ #ifndef _SYS_POLL_H_ #define _SYS_POLL_H_ /* * This file is intended to be compatable with the traditional poll.h. */ /* * This structure is passed as an array to poll(2). */ struct pollfd { int fd; /* which file descriptor to poll */ short events; /* events we are interested in */ short revents; /* events found on return */ }; /* * Requestable events. If poll(2) finds any of these set, they are * copied to revents on return. * XXX Note that FreeBSD doesn't make much distinction between POLLPRI * and POLLRDBAND since none of the file types have distinct priority * bands - and only some have an urgent "mode". * XXX Note POLLIN isn't really supported in true SVSV terms. Under SYSV * POLLIN includes all of normal, band and urgent data. Most poll handlers * on FreeBSD only treat it as "normal" data. */ #define POLLIN 0x0001 /* any readable data available */ #define POLLPRI 0x0002 /* OOB/Urgent readable data */ #define POLLOUT 0x0004 /* file descriptor is writeable */ #define POLLRDNORM 0x0040 /* non-OOB/URG data available */ #define POLLWRNORM POLLOUT /* no write type differentiation */ #define POLLRDBAND 0x0080 /* OOB/Urgent readable data */ #define POLLWRBAND 0x0100 /* OOB/Urgent data can be written */ /* * FreeBSD extensions: polling on a regular file might return one * of these events (currently only supported on UFS). */ #define POLLEXTEND 0x0200 /* file may have been extended */ #define POLLATTRIB 0x0400 /* file attributes may have changed */ #define POLLNLINK 0x0800 /* (un)link/rename may have happened */ #define POLLWRITE 0x1000 /* file's contents may have changed */ /* * These events are set if they occur regardless of whether they were * requested. */ #define POLLERR 0x0008 /* some poll error occurred */ #define POLLHUP 0x0010 /* file descriptor was "hung up" */ #define POLLNVAL 0x0020 /* requested events "invalid" */ #define POLLSTANDARD (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\ POLLWRBAND|POLLERR|POLLHUP|POLLNVAL) /* * Request that poll() wait forever. * XXX in SYSV, this is defined in stropts.h, which is not included * by poll.h. */ #define INFTIM (-1) #ifndef KERNEL #include <sys/cdefs.h> __BEGIN_DECLS /* * XXX logically, poll() should be declared in <poll.h>, but SVR4 at * least has it here in <sys/poll.h>. * XXX poll() has "unsigned long" nfds on SVR4, not unsigned as on the * other BSDs. */ int poll __P((struct pollfd *_pfd, unsigned _nfds, int _timeout)); __END_DECLS #endif /* !KERNEL */ #endif /* !_SYS_POLL_H_ */
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