The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/bsd/sys/poll.h

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    1 /*
    2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
    3  *
    4  * @APPLE_LICENSE_HEADER_START@
    5  * 
    6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
    7  * 
    8  * This file contains Original Code and/or Modifications of Original Code
    9  * as defined in and that are subject to the Apple Public Source License
   10  * Version 2.0 (the 'License'). You may not use this file except in
   11  * compliance with the License. Please obtain a copy of the License at
   12  * http://www.opensource.apple.com/apsl/ and read it before using this
   13  * file.
   14  * 
   15  * The Original Code and all software distributed under the License are
   16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
   20  * Please see the License for the specific language governing rights and
   21  * limitations under the License.
   22  * 
   23  * @APPLE_LICENSE_HEADER_END@
   24  */
   25 /*-
   26  * Copyright (c) 1997 Peter Wemm <peter@freebsd.org>
   27  * All rights reserved.
   28  *
   29  * Redistribution and use in source and binary forms, with or without
   30  * modification, are permitted provided that the following conditions
   31  * are met:
   32  * 1. Redistributions of source code must retain the above copyright
   33  *    notice, this list of conditions and the following disclaimer.
   34  * 2. Redistributions in binary form must reproduce the above copyright
   35  *    notice, this list of conditions and the following disclaimer in the
   36  *    documentation and/or other materials provided with the distribution.
   37  * 3. The name of the author may not be used to endorse or promote products
   38  *    derived from this software without specific prior written permission.
   39  *
   40  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   50  * SUCH DAMAGE.
   51  *
   52  */
   53 
   54 #ifndef _SYS_POLL_H_
   55 #define _SYS_POLL_H_
   56 
   57 #include <sys/appleapiopts.h>
   58 
   59 #ifdef __APPLE_API_PRIVATE
   60 /*
   61  * This file is intended to be compatable with the traditional poll.h.
   62  */
   63 
   64 /*
   65  * Requestable events.  If poll(2) finds any of these set, they are
   66  * copied to revents on return.
   67  * XXX Note that FreeBSD doesn't make much distinction between POLLPRI
   68  * and POLLRDBAND since none of the file types have distinct priority
   69  * bands - and only some have an urgent "mode".
   70  * XXX Note POLLIN isn't really supported in true SVSV terms.  Under SYSV
   71  * POLLIN includes all of normal, band and urgent data.  Most poll handlers
   72  * on FreeBSD only treat it as "normal" data.
   73  */
   74 #define POLLIN          0x0001          /* any readable data available */
   75 #define POLLPRI         0x0002          /* OOB/Urgent readable data */
   76 #define POLLOUT         0x0004          /* file descriptor is writeable */
   77 #define POLLRDNORM      0x0040          /* non-OOB/URG data available */
   78 #define POLLWRNORM      POLLOUT         /* no write type differentiation */
   79 #define POLLRDBAND      0x0080          /* OOB/Urgent readable data */
   80 #define POLLWRBAND      0x0100          /* OOB/Urgent data can be written */
   81 
   82 /*
   83  * FreeBSD extensions: polling on a regular file might return one
   84  * of these events (currently only supported on UFS).
   85  */
   86 #define POLLEXTEND      0x0200          /* file may have been extended */
   87 #define POLLATTRIB      0x0400          /* file attributes may have changed */
   88 #define POLLNLINK       0x0800          /* (un)link/rename may have happened */
   89 #define POLLWRITE       0x1000          /* file's contents may have changed */
   90 
   91 /*
   92  * These events are set if they occur regardless of whether they were
   93  * requested.
   94  */
   95 #define POLLERR         0x0008          /* some poll error occurred */
   96 #define POLLHUP         0x0010          /* file descriptor was "hung up" */
   97 #define POLLNVAL        0x0020          /* requested events "invalid" */
   98 
   99 #define POLLSTANDARD    (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\
  100                          POLLWRBAND|POLLERR|POLLHUP|POLLNVAL)
  101 
  102 #endif /* __APPLE_API_PRIVATE */
  103 
  104 #endif /* !_SYS_POLL_H_ */

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