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 | |
28 | int |
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 | } |
65 | libc_hidden_def (__sigtimedwait) |
66 | weak_alias (__sigtimedwait, sigtimedwait) |
67 | #else |
68 | # include <signal/sigtimedwait.c> |
69 | #endif |
70 | |