1/* Checking macros for poll functions.
2 Copyright (C) 2012-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef _SYS_POLL_H
20# error "Never include <bits/poll2.h> directly; use <sys/poll.h> instead."
21#endif
22
23
24__BEGIN_DECLS
25
26extern int __REDIRECT (__poll_alias, (struct pollfd *__fds, nfds_t __nfds,
27 int __timeout), poll);
28extern int __poll_chk (struct pollfd *__fds, nfds_t __nfds, int __timeout,
29 __SIZE_TYPE__ __fdslen);
30extern int __REDIRECT (__poll_chk_warn, (struct pollfd *__fds, nfds_t __nfds,
31 int __timeout, __SIZE_TYPE__ __fdslen),
32 __poll_chk)
33 __warnattr ("poll called with fds buffer too small file nfds entries");
34
35__fortify_function int
36poll (struct pollfd *__fds, nfds_t __nfds, int __timeout)
37{
38 if (__glibc_objsize (__fds) != (__SIZE_TYPE__) -1)
39 {
40 if (! __builtin_constant_p (__nfds))
41 return __poll_chk (__fds, __nfds, __timeout, __glibc_objsize (__fds));
42 else if (__glibc_objsize (__fds) / sizeof (*__fds) < __nfds)
43 return __poll_chk_warn (__fds, __nfds, __timeout,
44 __glibc_objsize (__fds));
45 }
46
47 return __poll_alias (__fds, __nfds, __timeout);
48}
49
50
51#ifdef __USE_GNU
52extern int __REDIRECT (__ppoll_alias, (struct pollfd *__fds, nfds_t __nfds,
53 const struct timespec *__timeout,
54 const __sigset_t *__ss), ppoll);
55extern int __ppoll_chk (struct pollfd *__fds, nfds_t __nfds,
56 const struct timespec *__timeout,
57 const __sigset_t *__ss, __SIZE_TYPE__ __fdslen);
58extern int __REDIRECT (__ppoll_chk_warn, (struct pollfd *__fds, nfds_t __nfds,
59 const struct timespec *__timeout,
60 const __sigset_t *__ss,
61 __SIZE_TYPE__ __fdslen),
62 __ppoll_chk)
63 __warnattr ("ppoll called with fds buffer too small file nfds entries");
64
65__fortify_function int
66ppoll (struct pollfd *__fds, nfds_t __nfds, const struct timespec *__timeout,
67 const __sigset_t *__ss)
68{
69 if (__glibc_objsize (__fds) != (__SIZE_TYPE__) -1)
70 {
71 if (! __builtin_constant_p (__nfds))
72 return __ppoll_chk (__fds, __nfds, __timeout, __ss,
73 __glibc_objsize (__fds));
74 else if (__glibc_objsize (__fds) / sizeof (*__fds) < __nfds)
75 return __ppoll_chk_warn (__fds, __nfds, __timeout, __ss,
76 __glibc_objsize (__fds));
77 }
78
79 return __ppoll_alias (__fds, __nfds, __timeout, __ss);
80}
81#endif
82
83__END_DECLS
84