1/* Copyright (C) 2006-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2006.
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#include <errno.h>
20#include <signal.h>
21#include <time.h>
22#include <sys/poll.h>
23#include <kernel-features.h>
24#include <sysdep-cancel.h>
25
26
27#ifdef __NR_ppoll
28# ifndef __ASSUME_PPOLL
29static int __generic_ppoll (struct pollfd *fds, nfds_t nfds,
30 const struct timespec *timeout,
31 const sigset_t *sigmask);
32# endif
33
34
35int
36ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
37 const sigset_t *sigmask)
38{
39 /* The Linux kernel can in some situations update the timeout value.
40 We do not want that so use a local variable. */
41 struct timespec tval;
42 if (timeout != NULL)
43 {
44 tval = *timeout;
45 timeout = &tval;
46 }
47
48 int result;
49
50 result = SYSCALL_CANCEL (ppoll, fds, nfds, timeout, sigmask, _NSIG / 8);
51
52# ifndef __ASSUME_PPOLL
53 if (result == -1 && errno == ENOSYS)
54 result = __generic_ppoll (fds, nfds, timeout, sigmask);
55# endif
56
57 return result;
58}
59libc_hidden_def (ppoll)
60
61# ifndef __ASSUME_PPOLL
62# define ppoll static __generic_ppoll
63# endif
64#endif
65
66#ifndef __ASSUME_PPOLL
67# include <io/ppoll.c>
68#endif
69