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: stable/3/sys/sys/poll.h 50583 1999-08-29 16:33:42Z peter $
   29  */
   30 
   31 #ifndef _SYS_POLL_H_
   32 #define _SYS_POLL_H_
   33 
   34 /*
   35  * This file is intended to be compatable with the traditional poll.h.
   36  */
   37 
   38 /*
   39  * This structure is passed as an array to poll(2).
   40  */
   41 struct pollfd {
   42         int     fd;             /* which file descriptor to poll */
   43         short   events;         /* events we are interested in */
   44         short   revents;        /* events found on return */
   45 };
   46 
   47 /*
   48  * Requestable events.  If poll(2) finds any of these set, they are
   49  * copied to revents on return.
   50  * XXX Note that FreeBSD doesn't make much distinction between POLLPRI
   51  * and POLLRDBAND since none of the file types have distinct priority
   52  * bands - and only some have an urgent "mode".
   53  * XXX Note POLLIN isn't really supported in true SVSV terms.  Under SYSV
   54  * POLLIN includes all of normal, band and urgent data.  Most poll handlers
   55  * on FreeBSD only treat it as "normal" data.
   56  */
   57 #define POLLIN          0x0001          /* any readable data available */
   58 #define POLLPRI         0x0002          /* OOB/Urgent readable data */
   59 #define POLLOUT         0x0004          /* file descriptor is writeable */
   60 #define POLLRDNORM      0x0040          /* non-OOB/URG data available */
   61 #define POLLWRNORM      POLLOUT         /* no write type differentiation */
   62 #define POLLRDBAND      0x0080          /* OOB/Urgent readable data */
   63 #define POLLWRBAND      0x0100          /* OOB/Urgent data can be written */
   64 
   65 /*
   66  * FreeBSD extensions: polling on a regular file might return one
   67  * of these events (currently only supported on UFS).
   68  */
   69 #define POLLEXTEND      0x0200          /* file may have been extended */
   70 #define POLLATTRIB      0x0400          /* file attributes may have changed */
   71 #define POLLNLINK       0x0800          /* (un)link/rename may have happened */
   72 #define POLLWRITE       0x1000          /* file's contents may have changed */
   73 
   74 /*
   75  * These events are set if they occur regardless of whether they were
   76  * requested.
   77  */
   78 #define POLLERR         0x0008          /* some poll error occurred */
   79 #define POLLHUP         0x0010          /* file descriptor was "hung up" */
   80 #define POLLNVAL        0x0020          /* requested events "invalid" */
   81 
   82 #define POLLSTANDARD    (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\
   83                          POLLWRBAND|POLLERR|POLLHUP|POLLNVAL)
   84 
   85 /*
   86  * Request that poll() wait forever.
   87  * XXX in SYSV, this is defined in stropts.h, which is not included
   88  * by poll.h.
   89  */
   90 #define INFTIM          (-1)
   91 
   92 #ifndef KERNEL
   93 
   94 #include <sys/cdefs.h>
   95 
   96 __BEGIN_DECLS
   97 /*
   98  * XXX logically, poll() should be declared in <poll.h>, but SVR4 at
   99  * least has it here in <sys/poll.h>.
  100  * XXX poll() has "unsigned long" nfds on SVR4, not unsigned as on the
  101  * other BSDs.
  102  */
  103 int     poll __P((struct pollfd *_pfd, unsigned _nfds, int _timeout));
  104 __END_DECLS
  105 
  106 #endif /* !KERNEL */
  107 
  108 #endif /* !_SYS_POLL_H_ */

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