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Annotation of XNU/bsd/sys/poll.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*-
        !            23:  * Copyright (c) 1997 Peter Wemm <[email protected]>
        !            24:  * All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. The name of the author may not be used to endorse or promote products
        !            35:  *    derived from this software without specific prior written permission.
        !            36:  *
        !            37:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            38:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            39:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            40:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        !            41:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            42:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            43:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            44:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            45:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            46:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            47:  * SUCH DAMAGE.
        !            48:  *
        !            49:  */
        !            50: 
        !            51: #ifndef _SYS_POLL_H_
        !            52: #define        _SYS_POLL_H_
        !            53: 
        !            54: /*
        !            55:  * This file is intended to be compatable with the traditional poll.h.
        !            56:  */
        !            57: 
        !            58: /*
        !            59:  * Requestable events.  If poll(2) finds any of these set, they are
        !            60:  * copied to revents on return.
        !            61:  * XXX Note that FreeBSD doesn't make much distinction between POLLPRI
        !            62:  * and POLLRDBAND since none of the file types have distinct priority
        !            63:  * bands - and only some have an urgent "mode".
        !            64:  * XXX Note POLLIN isn't really supported in true SVSV terms.  Under SYSV
        !            65:  * POLLIN includes all of normal, band and urgent data.  Most poll handlers
        !            66:  * on FreeBSD only treat it as "normal" data.
        !            67:  */
        !            68: #define        POLLIN          0x0001          /* any readable data available */
        !            69: #define        POLLPRI         0x0002          /* OOB/Urgent readable data */
        !            70: #define        POLLOUT         0x0004          /* file descriptor is writeable */
        !            71: #define        POLLRDNORM      0x0040          /* non-OOB/URG data available */
        !            72: #define        POLLWRNORM      POLLOUT         /* no write type differentiation */
        !            73: #define        POLLRDBAND      0x0080          /* OOB/Urgent readable data */
        !            74: #define        POLLWRBAND      0x0100          /* OOB/Urgent data can be written */
        !            75: 
        !            76: /*
        !            77:  * FreeBSD extensions: polling on a regular file might return one
        !            78:  * of these events (currently only supported on UFS).
        !            79:  */
        !            80: #define        POLLEXTEND      0x0200          /* file may have been extended */
        !            81: #define        POLLATTRIB      0x0400          /* file attributes may have changed */
        !            82: #define        POLLNLINK       0x0800          /* (un)link/rename may have happened */
        !            83: #define        POLLWRITE       0x1000          /* file's contents may have changed */
        !            84: 
        !            85: /*
        !            86:  * These events are set if they occur regardless of whether they were
        !            87:  * requested.
        !            88:  */
        !            89: #define        POLLERR         0x0008          /* some poll error occurred */
        !            90: #define        POLLHUP         0x0010          /* file descriptor was "hung up" */
        !            91: #define        POLLNVAL        0x0020          /* requested events "invalid" */
        !            92: 
        !            93: #define        POLLSTANDARD    (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\
        !            94:                         POLLWRBAND|POLLERR|POLLHUP|POLLNVAL)
        !            95: 
        !            96: 
        !            97: #endif /* !_SYS_POLL_H_ */

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