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
39 typedef unsigned int nfds_t;
40
41 int poll(struct pollfd*, nfds_t, int) __overloadable __RENAME_CLANG(poll);
42 int ppoll(struct pollfd*, nfds_t, const struct timespec*, const sigset_t*)
43 __overloadable __RENAME_CLANG(ppoll) __INTRODUCED_IN(21);
44
45 int __poll_chk(struct pollfd*, nfds_t, int, size_t) __INTRODUCED_IN(23);
46 int __ppoll_chk(struct pollfd*, nfds_t, const struct timespec*, const sigset_t*, size_t)
47 __INTRODUCED_IN(23);
48
49 #if defined(__BIONIC_FORTIFY)
50 #if __ANDROID_API__ >= __ANDROID_API_M__
51 #if defined(__clang__)
52 __BIONIC_ERROR_FUNCTION_VISIBILITY
53 int poll(struct pollfd* fds, nfds_t fd_count, int timeout) __overloadable
54 __enable_if(__bos(fds) != __BIONIC_FORTIFY_UNKNOWN_SIZE &&
55 __bos(fds) < sizeof(*fds) * fd_count,
56 "selected when there aren't fd_count fds")
57 __errorattr("too many fds specified");
58
59 __BIONIC_FORTIFY_INLINE
poll(struct pollfd * const fds __pass_object_size,nfds_t fd_count,int timeout)60 int poll(struct pollfd* const fds __pass_object_size, nfds_t fd_count,
61 int timeout) __overloadable {
62 size_t bos_fds = __bos(fds);
63
64 if (bos_fds == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
65 return __call_bypassing_fortify(poll)(fds, fd_count, timeout);
66 }
67
68 return __poll_chk(fds, fd_count, timeout, bos_fds);
69 }
70
71 __BIONIC_ERROR_FUNCTION_VISIBILITY
72 int ppoll(struct pollfd* fds, nfds_t fd_count, const struct timespec* timeout,
73 const sigset_t* mask) __overloadable
74 __enable_if(__bos(fds) != __BIONIC_FORTIFY_UNKNOWN_SIZE &&
75 __bos(fds) < sizeof(*fds) * fd_count,
76 "selected when there aren't fd_count fds")
77 __errorattr("too many fds specified");
78
79 __BIONIC_FORTIFY_INLINE
ppoll(struct pollfd * const fds __pass_object_size,nfds_t fd_count,const struct timespec * timeout,const sigset_t * mask)80 int ppoll(struct pollfd* const fds __pass_object_size, nfds_t fd_count,
81 const struct timespec* timeout, const sigset_t* mask) __overloadable {
82 size_t bos_fds = __bos(fds);
83
84 if (bos_fds == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
85 return __call_bypassing_fortify(ppoll)(fds, fd_count, timeout, mask);
86 }
87
88 return __ppoll_chk(fds, fd_count, timeout, mask, bos_fds);
89 }
90 #else /* defined(__clang__) */
91 int __poll_real(struct pollfd*, nfds_t, int) __RENAME(poll);
92 __errordecl(__poll_too_small_error, "poll: pollfd array smaller than fd count");
93
94 int __ppoll_real(struct pollfd*, nfds_t, const struct timespec*, const sigset_t*) __RENAME(ppoll)
95 __INTRODUCED_IN(21);
96 __errordecl(__ppoll_too_small_error, "ppoll: pollfd array smaller than fd count");
97
98 __BIONIC_FORTIFY_INLINE
poll(struct pollfd * fds,nfds_t fd_count,int timeout)99 int poll(struct pollfd* fds, nfds_t fd_count, int timeout) {
100 if (__bos(fds) != __BIONIC_FORTIFY_UNKNOWN_SIZE) {
101 if (!__builtin_constant_p(fd_count)) {
102 return __poll_chk(fds, fd_count, timeout, __bos(fds));
103 } else if (__bos(fds) / sizeof(*fds) < fd_count) {
104 __poll_too_small_error();
105 }
106 }
107 return __poll_real(fds, fd_count, timeout);
108 }
109
110 __BIONIC_FORTIFY_INLINE
ppoll(struct pollfd * fds,nfds_t fd_count,const struct timespec * timeout,const sigset_t * mask)111 int ppoll(struct pollfd* fds, nfds_t fd_count, const struct timespec* timeout,
112 const sigset_t* mask) {
113 if (__bos(fds) != __BIONIC_FORTIFY_UNKNOWN_SIZE) {
114 if (!__builtin_constant_p(fd_count)) {
115 return __ppoll_chk(fds, fd_count, timeout, mask, __bos(fds));
116 } else if (__bos(fds) / sizeof(*fds) < fd_count) {
117 __ppoll_too_small_error();
118 }
119 }
120 return __ppoll_real(fds, fd_count, timeout, mask);
121 }
122
123 #endif /* defined(__clang__) */
124 #endif /* __ANDROID_API__ >= __ANDROID_API_M__ */
125 #endif /* defined(__BIONIC_FORTIFY) */
126
127 __END_DECLS
128
129 #endif /* _POLL_H_ */
130