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/sys/poll.h

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    1 /*-
    2  * Copyright (c) 1997 Peter Wemm <peter@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. The name of the author may not be used to endorse or promote products
   14  *    derived from this software without specific prior written permission.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: src/sys/sys/poll.h,v 1.6.2.1 2000/08/21 12:25:58 sheldonh Exp $
   29  * $DragonFly: src/sys/sys/poll.h,v 1.7 2008/01/12 06:01:27 nant Exp $
   30  */
   31 
   32 #ifndef _SYS_POLL_H_
   33 #define _SYS_POLL_H_
   34 
   35 /*
   36  * This file is intended to be compatible with the traditional poll.h.
   37  */
   38 
   39 typedef unsigned int    nfds_t;
   40 
   41 /*
   42  * This structure is passed as an array to poll(2).
   43  */
   44 struct pollfd {
   45         int     fd;             /* which file descriptor to poll */
   46         short   events;         /* events we are interested in */
   47         short   revents;        /* events found on return */
   48 };
   49 
   50 /*
   51  * Requestable events.  If poll(2) finds any of these set, they are
   52  * copied to revents on return.
   53  * XXX Note that FreeBSD doesn't make much distinction between POLLPRI
   54  * and POLLRDBAND since none of the file types have distinct priority
   55  * bands - and only some have an urgent "mode".
   56  * XXX Note POLLIN isn't really supported in true SVSV terms.  Under SYSV
   57  * POLLIN includes all of normal, band and urgent data.  Most poll handlers
   58  * on FreeBSD only treat it as "normal" data.
   59  */
   60 #define POLLIN          0x0001          /* any readable data available */
   61 #define POLLPRI         0x0002          /* OOB/Urgent readable data */
   62 #define POLLOUT         0x0004          /* file descriptor is writeable */
   63 #define POLLRDNORM      0x0040          /* non-OOB/URG data available */
   64 #define POLLWRNORM      POLLOUT         /* no write type differentiation */
   65 #define POLLRDBAND      0x0080          /* OOB/Urgent readable data */
   66 #define POLLWRBAND      0x0100          /* OOB/Urgent data can be written */
   67 
   68 /*
   69  * These events are set if they occur regardless of whether they were
   70  * requested.
   71  */
   72 #define POLLERR         0x0008          /* some poll error occurred */
   73 #define POLLHUP         0x0010          /* file descriptor was "hung up" */
   74 #define POLLNVAL        0x0020          /* requested events "invalid" */
   75 
   76 #define POLLSTANDARD    (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\
   77                          POLLWRBAND|POLLERR|POLLHUP|POLLNVAL)
   78 
   79 /*
   80  * Request that poll() wait forever.
   81  * XXX in SYSV, this is defined in stropts.h, which is not included
   82  * by poll.h.
   83  */
   84 #define INFTIM          (-1)
   85 
   86 #ifndef _KERNEL
   87 
   88 #include <sys/cdefs.h>
   89 
   90 __BEGIN_DECLS
   91 /*
   92  * XXX logically, poll() should be declared in <poll.h>, but SVR4 at
   93  * least has it here in <sys/poll.h>.
   94  */
   95 int     poll (struct pollfd *, nfds_t, int);
   96 __END_DECLS
   97 
   98 #endif /* !_KERNEL */
   99 
  100 #endif /* !_SYS_POLL_H_ */

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