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
26 extern int __REDIRECT (__poll_alias, (struct pollfd *__fds, nfds_t __nfds,
27 int __timeout), poll);
28 extern int __poll_chk (struct pollfd *__fds, nfds_t __nfds, int __timeout,
29 __SIZE_TYPE__ __fdslen)
30 __attr_access ((__write_only__, 1, 2));
31 extern int __REDIRECT (__poll_chk_warn, (struct pollfd *__fds, nfds_t __nfds,
32 int __timeout, __SIZE_TYPE__ __fdslen),
33 __poll_chk)
34 __warnattr ("poll called with fds buffer too small file nfds entries");
35
36 __fortify_function __attr_access ((__write_only__, 1, 2)) int
poll(struct pollfd * __fds,nfds_t __nfds,int __timeout)37 poll (struct pollfd *__fds, nfds_t __nfds, int __timeout)
38 {
39 if (__glibc_objsize (__fds) != (__SIZE_TYPE__) -1)
40 {
41 if (! __builtin_constant_p (__nfds))
42 return __poll_chk (__fds, __nfds, __timeout, __glibc_objsize (__fds));
43 else if (__glibc_objsize (__fds) / sizeof (*__fds) < __nfds)
44 return __poll_chk_warn (__fds, __nfds, __timeout,
45 __glibc_objsize (__fds));
46 }
47
48 return __poll_alias (__fds, __nfds, __timeout);
49 }
50
51
52 #ifdef __USE_GNU
53 extern int __REDIRECT (__ppoll_alias, (struct pollfd *__fds, nfds_t __nfds,
54 const struct timespec *__timeout,
55 const __sigset_t *__ss), ppoll);
56 extern int __ppoll_chk (struct pollfd *__fds, nfds_t __nfds,
57 const struct timespec *__timeout,
58 const __sigset_t *__ss, __SIZE_TYPE__ __fdslen)
59 __attr_access ((__write_only__, 1, 2));
60 extern int __REDIRECT (__ppoll_chk_warn, (struct pollfd *__fds, nfds_t __nfds,
61 const struct timespec *__timeout,
62 const __sigset_t *__ss,
63 __SIZE_TYPE__ __fdslen),
64 __ppoll_chk)
65 __warnattr ("ppoll called with fds buffer too small file nfds entries");
66
67 __fortify_function __attr_access ((__write_only__, 1, 2)) int
ppoll(struct pollfd * __fds,nfds_t __nfds,const struct timespec * __timeout,const __sigset_t * __ss)68 ppoll (struct pollfd *__fds, nfds_t __nfds, const struct timespec *__timeout,
69 const __sigset_t *__ss)
70 {
71 if (__glibc_objsize (__fds) != (__SIZE_TYPE__) -1)
72 {
73 if (! __builtin_constant_p (__nfds))
74 return __ppoll_chk (__fds, __nfds, __timeout, __ss,
75 __glibc_objsize (__fds));
76 else if (__glibc_objsize (__fds) / sizeof (*__fds) < __nfds)
77 return __ppoll_chk_warn (__fds, __nfds, __timeout, __ss,
78 __glibc_objsize (__fds));
79 }
80
81 return __ppoll_alias (__fds, __nfds, __timeout, __ss);
82 }
83 #endif
84
85 __END_DECLS