1/* Copyright (C) 1997-2016 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#define __need_NULL
21#include <stddef.h>
22#include <string.h>
23
24#include <nptl/pthreadP.h>
25#include <sysdep-cancel.h>
26#include <sys/syscall.h>
27
28#ifdef __NR_rt_sigtimedwait
29
30/* Return any pending signal or wait for one for the given time. */
31int
32__sigwaitinfo (const sigset_t *set, siginfo_t *info)
33{
34#ifdef SIGCANCEL
35 sigset_t tmpset;
36 if (set != NULL
37 && (__builtin_expect (__sigismember (set, SIGCANCEL), 0)
38# ifdef SIGSETXID
39 || __builtin_expect (__sigismember (set, SIGSETXID), 0)
40# endif
41 ))
42 {
43 /* Create a temporary mask without the bit for SIGCANCEL set. */
44 // We are not copying more than we have to.
45 memcpy (&tmpset, set, _NSIG / 8);
46 __sigdelset (&tmpset, SIGCANCEL);
47# ifdef SIGSETXID
48 __sigdelset (&tmpset, SIGSETXID);
49# endif
50 set = &tmpset;
51 }
52#endif
53
54 /* XXX The size argument hopefully will have to be changed to the
55 real size of the user-level sigset_t. */
56 int result = SYSCALL_CANCEL (rt_sigtimedwait, set, info, NULL, _NSIG / 8);
57
58 /* The kernel generates a SI_TKILL code in si_code in case tkill is
59 used. tkill is transparently used in raise(). Since having
60 SI_TKILL as a code is useful in general we fold the results
61 here. */
62 if (result != -1 && info != NULL && info->si_code == SI_TKILL)
63 info->si_code = SI_USER;
64
65 return result;
66}
67
68libc_hidden_def (__sigwaitinfo)
69weak_alias (__sigwaitinfo, sigwaitinfo)
70#else
71# include <signal/sigwaitinfo.c>
72#endif
73strong_alias (__sigwaitinfo, __libc_sigwaitinfo)
74