1*53ee8cc1Swenshuai.xi /* Copyright (C) 1997, 2001, 2006 Free Software Foundation, Inc. 2*53ee8cc1Swenshuai.xi This file is part of the GNU C Library. 3*53ee8cc1Swenshuai.xi 4*53ee8cc1Swenshuai.xi The GNU C Library is free software; you can redistribute it and/or 5*53ee8cc1Swenshuai.xi modify it under the terms of the GNU Lesser General Public 6*53ee8cc1Swenshuai.xi License as published by the Free Software Foundation; either 7*53ee8cc1Swenshuai.xi version 2.1 of the License, or (at your option) any later version. 8*53ee8cc1Swenshuai.xi 9*53ee8cc1Swenshuai.xi The GNU C Library is distributed in the hope that it will be useful, 10*53ee8cc1Swenshuai.xi but WITHOUT ANY WARRANTY; without even the implied warranty of 11*53ee8cc1Swenshuai.xi MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12*53ee8cc1Swenshuai.xi Lesser General Public License for more details. 13*53ee8cc1Swenshuai.xi 14*53ee8cc1Swenshuai.xi You should have received a copy of the GNU Lesser General Public 15*53ee8cc1Swenshuai.xi License along with the GNU C Library; if not, write to the Free 16*53ee8cc1Swenshuai.xi Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17*53ee8cc1Swenshuai.xi 02111-1307 USA. */ 18*53ee8cc1Swenshuai.xi 19*53ee8cc1Swenshuai.xi #ifndef _SYS_POLL_H 20*53ee8cc1Swenshuai.xi # error "Never use <bits/poll.h> directly; include <sys/poll.h> instead." 21*53ee8cc1Swenshuai.xi #endif 22*53ee8cc1Swenshuai.xi 23*53ee8cc1Swenshuai.xi /* Event types that can be polled for. These bits may be set in `events' 24*53ee8cc1Swenshuai.xi to indicate the interesting event types; they will appear in `revents' 25*53ee8cc1Swenshuai.xi to indicate the status of the file descriptor. */ 26*53ee8cc1Swenshuai.xi #define POLLIN 0x001 /* There is data to read. */ 27*53ee8cc1Swenshuai.xi #define POLLPRI 0x002 /* There is urgent data to read. */ 28*53ee8cc1Swenshuai.xi #define POLLOUT 0x004 /* Writing now will not block. */ 29*53ee8cc1Swenshuai.xi 30*53ee8cc1Swenshuai.xi #ifdef __USE_XOPEN 31*53ee8cc1Swenshuai.xi /* These values are defined in XPG4.2. */ 32*53ee8cc1Swenshuai.xi # define POLLRDNORM 0x040 /* Normal data may be read. */ 33*53ee8cc1Swenshuai.xi # define POLLRDBAND 0x080 /* Priority data may be read. */ 34*53ee8cc1Swenshuai.xi # define POLLWRNORM POLLOUT /* Writing now will not block. */ 35*53ee8cc1Swenshuai.xi # define POLLWRBAND 0x100 /* Priority data may be written. */ 36*53ee8cc1Swenshuai.xi #endif 37*53ee8cc1Swenshuai.xi 38*53ee8cc1Swenshuai.xi #ifdef __USE_GNU 39*53ee8cc1Swenshuai.xi /* These are extensions for Linux. */ 40*53ee8cc1Swenshuai.xi # define POLLMSG 0x400 41*53ee8cc1Swenshuai.xi # define POLLREMOVE 0x1000 42*53ee8cc1Swenshuai.xi # define POLLRDHUP 0x2000 43*53ee8cc1Swenshuai.xi #endif 44*53ee8cc1Swenshuai.xi 45*53ee8cc1Swenshuai.xi /* Event types always implicitly polled for. These bits need not be set in 46*53ee8cc1Swenshuai.xi `events', but they will appear in `revents' to indicate the status of 47*53ee8cc1Swenshuai.xi the file descriptor. */ 48*53ee8cc1Swenshuai.xi #define POLLERR 0x008 /* Error condition. */ 49*53ee8cc1Swenshuai.xi #define POLLHUP 0x010 /* Hung up. */ 50*53ee8cc1Swenshuai.xi #define POLLNVAL 0x020 /* Invalid polling request. */ 51