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 POLLOUT /* Writing now will not block. */ 35 # define POLLWRBAND 0x100 /* 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