poll.h revision b97049c0390cb1a11b9cb0b14391972e69398ce5 
1/*
2 * Copyright (C) 2017 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#error "Never include this file directly; instead, include <poll.h>"
31#endif
32
33int __poll_chk(struct pollfd*, nfds_t, int, size_t) __INTRODUCED_IN(23);
34int __ppoll_chk(struct pollfd*, nfds_t, const struct timespec*, const sigset_t*, size_t)
35  __INTRODUCED_IN(23);
36
37#if defined(__BIONIC_FORTIFY)
38#if __ANDROID_API__ >= __ANDROID_API_M__
39#if defined(__clang__)
40__BIONIC_ERROR_FUNCTION_VISIBILITY
41int poll(struct pollfd* fds, nfds_t fd_count, int timeout) __overloadable
42        __enable_if(__bos(fds) != __BIONIC_FORTIFY_UNKNOWN_SIZE &&
43                    __bos(fds) < sizeof(*fds) * fd_count,
44                    "selected when there aren't fd_count fds")
45        __errorattr("too many fds specified");
46
47__BIONIC_FORTIFY_INLINE
48int poll(struct pollfd* const fds __pass_object_size, nfds_t fd_count,
49        int timeout) __overloadable {
50  size_t bos_fds = __bos(fds);
51
52  if (bos_fds == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
53      return __call_bypassing_fortify(poll)(fds, fd_count, timeout);
54  }
55
56  return __poll_chk(fds, fd_count, timeout, bos_fds);
57}
58
59__BIONIC_ERROR_FUNCTION_VISIBILITY
60int ppoll(struct pollfd* fds, nfds_t fd_count, const struct timespec* timeout,
61          const sigset_t* mask)  __overloadable
62        __enable_if(__bos(fds) != __BIONIC_FORTIFY_UNKNOWN_SIZE &&
63                    __bos(fds) < sizeof(*fds) * fd_count,
64                    "selected when there aren't fd_count fds")
65        __errorattr("too many fds specified");
66
67__BIONIC_FORTIFY_INLINE
68int ppoll(struct pollfd* const fds __pass_object_size, nfds_t fd_count,
69          const struct timespec* timeout, const sigset_t* mask) __overloadable {
70  size_t bos_fds = __bos(fds);
71
72  if (bos_fds == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
73      return __call_bypassing_fortify(ppoll)(fds, fd_count, timeout, mask);
74  }
75
76  return __ppoll_chk(fds, fd_count, timeout, mask, bos_fds);
77}
78#else /* defined(__clang__) */
79int __poll_real(struct pollfd*, nfds_t, int) __RENAME(poll);
80__errordecl(__poll_too_small_error, "poll: pollfd array smaller than fd count");
81
82int __ppoll_real(struct pollfd*, nfds_t, const struct timespec*, const sigset_t*) __RENAME(ppoll)
83  __INTRODUCED_IN(21);
84__errordecl(__ppoll_too_small_error, "ppoll: pollfd array smaller than fd count");
85
86__BIONIC_FORTIFY_INLINE
87int poll(struct pollfd* fds, nfds_t fd_count, int timeout) {
88  if (__bos(fds) != __BIONIC_FORTIFY_UNKNOWN_SIZE) {
89    if (!__builtin_constant_p(fd_count)) {
90      return __poll_chk(fds, fd_count, timeout, __bos(fds));
91    } else if (__bos(fds) / sizeof(*fds) < fd_count) {
92      __poll_too_small_error();
93    }
94  }
95  return __poll_real(fds, fd_count, timeout);
96}
97
98__BIONIC_FORTIFY_INLINE
99int ppoll(struct pollfd* fds, nfds_t fd_count, const struct timespec* timeout,
100          const sigset_t* mask) {
101  if (__bos(fds) != __BIONIC_FORTIFY_UNKNOWN_SIZE) {
102    if (!__builtin_constant_p(fd_count)) {
103      return __ppoll_chk(fds, fd_count, timeout, mask, __bos(fds));
104    } else if (__bos(fds) / sizeof(*fds) < fd_count) {
105      __ppoll_too_small_error();
106    }
107  }
108  return __ppoll_real(fds, fd_count, timeout, mask);
109}
110
111#endif /* defined(__clang__) */
112#endif /* __ANDROID_API__ >= __ANDROID_API_M__ */
113#endif /* defined(__BIONIC_FORTIFY) */
114