1 /* Checking macros for poll functions.
2 Copyright (C) 2012 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 <http://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 extern 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
poll(struct pollfd * __fds,nfds_t __nfds,int __timeout)36 poll (struct pollfd *__fds, nfds_t __nfds, int __timeout)
37 {
38 if (__bos (__fds) != (__SIZE_TYPE__) -1)
39 {
40 if (! __builtin_constant_p (__nfds))
41 return __poll_chk (__fds, __nfds, __timeout, __bos (__fds));
42 else if (__bos (__fds) / sizeof (*__fds) < __nfds)
43 return __poll_chk_warn (__fds, __nfds, __timeout, __bos (__fds));
44 }
45
46 return __poll_alias (__fds, __nfds, __timeout);
47 }
48
49
50 #ifdef __USE_GNU
51 extern int __REDIRECT (__ppoll_alias, (struct pollfd *__fds, nfds_t __nfds,
52 const struct timespec *__timeout,
53 const __sigset_t *__ss), ppoll);
54 extern int __ppoll_chk (struct pollfd *__fds, nfds_t __nfds,
55 const struct timespec *__timeout,
56 const __sigset_t *__ss, __SIZE_TYPE__ __fdslen);
57 extern int __REDIRECT (__ppoll_chk_warn, (struct pollfd *__fds, nfds_t __nfds,
58 const struct timespec *__timeout,
59 const __sigset_t *__ss,
60 __SIZE_TYPE__ __fdslen),
61 __ppoll_chk)
62 __warnattr ("ppoll called with fds buffer too small file nfds entries");
63
64 __fortify_function int
ppoll(struct pollfd * __fds,nfds_t __nfds,const struct timespec * __timeout,const __sigset_t * __ss)65 ppoll (struct pollfd *__fds, nfds_t __nfds, const struct timespec *__timeout,
66 const __sigset_t *__ss)
67 {
68 if (__bos (__fds) != (__SIZE_TYPE__) -1)
69 {
70 if (! __builtin_constant_p (__nfds))
71 return __ppoll_chk (__fds, __nfds, __timeout, __ss, __bos (__fds));
72 else if (__bos (__fds) / sizeof (*__fds) < __nfds)
73 return __ppoll_chk_warn (__fds, __nfds, __timeout, __ss,
74 __bos (__fds));
75 }
76
77 return __ppoll_alias (__fds, __nfds, __timeout, __ss);
78 }
79 #endif
80
81 __END_DECLS
82