1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef _POLL_H_
30#define _POLL_H_
31
32#include <sys/cdefs.h>
33#include <linux/poll.h>
34#include <signal.h> /* For sigset_t. */
35#include <time.h> /* For timespec. */
36
37__BEGIN_DECLS
38
39typedef unsigned int nfds_t;
40
41int poll(struct pollfd*, nfds_t, int);
42int ppoll(struct pollfd*, nfds_t, const struct timespec*, const sigset_t*);
43
44int __poll_chk(struct pollfd*, nfds_t, int, size_t);
45int __poll_real(struct pollfd*, nfds_t, int) __RENAME(poll);
46__errordecl(__poll_too_small_error, "poll: pollfd array smaller than fd count");
47
48int __ppoll_chk(struct pollfd*, nfds_t, const struct timespec*, const sigset_t*, size_t);
49int __ppoll_real(struct pollfd*, nfds_t, const struct timespec*, const sigset_t*) __RENAME(ppoll);
50__errordecl(__ppoll_too_small_error, "ppoll: pollfd array smaller than fd count");
51
52#if defined(__BIONIC_FORTIFY)
53
54__BIONIC_FORTIFY_INLINE
55int poll(struct pollfd* fds, nfds_t fd_count, int timeout) {
56#if defined(__clang__)
57  return __poll_chk(fds, fd_count, timeout, __bos(fds));
58#else
59  if (__bos(fds) != __BIONIC_FORTIFY_UNKNOWN_SIZE) {
60    if (!__builtin_constant_p(fd_count)) {
61      return __poll_chk(fds, fd_count, timeout, __bos(fds));
62    } else if (__bos(fds) / sizeof(*fds) < fd_count) {
63      __poll_too_small_error();
64    }
65  }
66  return __poll_real(fds, fd_count, timeout);
67#endif
68}
69
70__BIONIC_FORTIFY_INLINE
71int ppoll(struct pollfd* fds, nfds_t fd_count, const struct timespec* timeout, const sigset_t* mask) {
72#if defined(__clang__)
73  return __ppoll_chk(fds, fd_count, timeout, mask, __bos(fds));
74#else
75  if (__bos(fds) != __BIONIC_FORTIFY_UNKNOWN_SIZE) {
76    if (!__builtin_constant_p(fd_count)) {
77      return __ppoll_chk(fds, fd_count, timeout, mask, __bos(fds));
78    } else if (__bos(fds) / sizeof(*fds) < fd_count) {
79      __ppoll_too_small_error();
80    }
81  }
82  return __ppoll_real(fds, fd_count, timeout, mask);
83#endif
84}
85
86#endif
87
88__END_DECLS
89
90#endif /* _POLL_H_ */
91