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[glibc/history.git] / bits / poll.h
blob022a06cc1bfe48c60de875128ac66b26c4693899
1 /* Copyright (C) 1997, 2000, 2001 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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. */
19 #ifndef _SYS_POLL_H
20 # error "Never use <bits/poll.h> directly; include <sys/poll.h> instead."
21 #endif
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. */
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
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. */