/* Copyright (C) 1997 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef _SYS_POLL_H # error "Never use <bits/poll.h> directly; include <sys/poll.h> instead." #endif /* Event types that can be polled for. These bits may be set in `events' to indicate the interesting event types; they will appear in `revents' to indicate the status of the file descriptor. */ #define POLLIN 0x001 /* There is data to read. */ #define POLLPRI 0x002 /* There is urgent data to read. */ #define POLLOUT 0x004 /* Writing now will not block. */ #ifdef __USE_XOPEN /* These values are defined in XPG4.2. */ # define POLLRDNORM 0x040 /* Normal data may be read. */ # define POLLRDBAND 0x080 /* Priority data may be read. */ # define POLLWRNORM 0x100 /* Writing now will not block. */ # define POLLWRBAND 0x200 /* Priority data may be written. */ #endif #ifdef __USE_GNU /* This is an extension for Linux. */ # define POLLMSG 0x400 #endif /* Event types always implicitly polled for. These bits need not be set in `events', but they will appear in `revents' to indicate the status of the file descriptor. */ #define POLLERR 0x008 /* Error condition. */ #define POLLHUP 0x010 /* Hung up. */ #define POLLNVAL 0x020 /* Invalid polling request. */ /* Canonical number of polling requests to read in at a time in poll. */ #define NPOLLFILE 30