1: /* Copyright (C) 1997, 2000, 2001 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3: 
    4:    The GNU C Library is free software; you can redistribute it and/or
    5:    modify it under the terms of the GNU Lesser General Public
    6:    License as published by the Free Software Foundation; either
    7:    version 2.1 of the License, or (at your option) any later version.
    8: 
    9:    The GNU C Library is distributed in the hope that it will be useful,
   10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   12:    Lesser General Public License for more details.
   13: 
   14:    You should have received a copy of the GNU Lesser General Public
   15:    License along with the GNU C Library; if not, write to the Free
   16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   17:    02111-1307 USA.  */
   18: 
   19: #ifndef _SYS_POLL_H
   20: # error "Never use <bits/poll.h> directly; include <sys/poll.h> instead."
   21: #endif
   22: 
   23: /* Event types that can be polled for.  These bits may be set in `events'
   24:    to indicate the interesting event types; they will appear in `revents'
   25:    to indicate the status of the file descriptor.  */
   26: #define POLLIN          01              /* There is data to read.  */
   27: #define POLLPRI         02              /* There is urgent data to read.  */
   28: #define POLLOUT         04              /* Writing now will not block.  */
   29: 
   30: #ifdef __USE_XOPEN
   31: /* These values are defined in XPG4.2.  */
   32: # define POLLRDNORM     POLLIN              /* Normal data may be read.  */
   33: # define POLLRDBAND     POLLPRI             /* Priority data may be read.  */
   34: # define POLLWRNORM     POLLOUT             /* Writing now will not block.  */
   35: # define POLLWRBAND     POLLOUT             /* Priority data may be written.  */
   36: #endif
   37: 
   38: /* Event types always implicitly polled for.  These bits need not be set in
   39:    `events', but they will appear in `revents' to indicate the status of
   40:    the file descriptor.  */
   41: #define POLLERR         010             /* Error condition.  */
   42: #define POLLHUP         020             /* Hung up.  */
   43: #define POLLNVAL        040             /* Invalid polling request.  */