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 | #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. */ |
31 | int |
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 | |
68 | libc_hidden_def (__sigwaitinfo) |
69 | weak_alias (__sigwaitinfo, sigwaitinfo) |
70 | #else |
71 | # include <signal/sigwaitinfo.c> |
72 | #endif |
73 | strong_alias (__sigwaitinfo, __libc_sigwaitinfo) |
74 | |