1/* Copyright (C) 1997-2017 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <signal.h>
20#include <string.h>
21
22#include <nptl/pthreadP.h>
23#include <sysdep-cancel.h>
24#include <sys/syscall.h>
25
26#ifdef __NR_rt_sigtimedwait
27
28int
29__sigtimedwait (const sigset_t *set, siginfo_t *info,
30 const struct timespec *timeout)
31{
32#ifdef SIGCANCEL
33 sigset_t tmpset;
34 if (set != NULL
35 && (__builtin_expect (__sigismember (set, SIGCANCEL), 0)
36# ifdef SIGSETXID
37 || __builtin_expect (__sigismember (set, SIGSETXID), 0)
38# endif
39 ))
40 {
41 /* Create a temporary mask without the bit for SIGCANCEL set. */
42 // We are not copying more than we have to.
43 memcpy (&tmpset, set, _NSIG / 8);
44 __sigdelset (&tmpset, SIGCANCEL);
45# ifdef SIGSETXID
46 __sigdelset (&tmpset, SIGSETXID);
47# endif
48 set = &tmpset;
49 }
50#endif
51
52 /* XXX The size argument hopefully will have to be changed to the
53 real size of the user-level sigset_t. */
54 int result = SYSCALL_CANCEL (rt_sigtimedwait, set, info, timeout, _NSIG / 8);
55
56 /* The kernel generates a SI_TKILL code in si_code in case tkill is
57 used. tkill is transparently used in raise(). Since having
58 SI_TKILL as a code is useful in general we fold the results
59 here. */
60 if (result != -1 && info != NULL && info->si_code == SI_TKILL)
61 info->si_code = SI_USER;
62
63 return result;
64}
65libc_hidden_def (__sigtimedwait)
66weak_alias (__sigtimedwait, sigtimedwait)
67#else
68# include <signal/sigtimedwait.c>
69#endif
70