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      1 /* Copyright (C) 1997, 2001, 2006 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		0x001		/* There is data to read.  */
     27 #define POLLPRI		0x002		/* There is urgent data to read.  */
     28 #define POLLOUT		0x004		/* Writing now will not block.  */
     29 
     30 #ifdef __USE_XOPEN
     31 /* These values are defined in XPG4.2.  */
     32 # define POLLRDNORM	0x040		/* Normal data may be read.  */
     33 # define POLLRDBAND	0x080		/* Priority data may be read.  */
     34 # define POLLWRNORM	0x100		/* Writing now will not block.  */
     35 # define POLLWRBAND	0x200		/* Priority data may be written.  */
     36 #endif
     37 
     38 #ifdef __USE_GNU
     39 /* These are extensions for Linux.  */
     40 # define POLLMSG	0x400
     41 # define POLLREMOVE	0x1000
     42 # define POLLRDHUP	0x2000
     43 #endif
     44 
     45 /* Event types always implicitly polled for.  These bits need not be set in
     46    `events', but they will appear in `revents' to indicate the status of
     47    the file descriptor.  */
     48 #define POLLERR		0x008		/* Error condition.  */
     49 #define POLLHUP		0x010		/* Hung up.  */
     50 #define POLLNVAL	0x020		/* Invalid polling request.  */
     51