1 | /* Copyright (C) 1997-2018 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 | #include <sysdep-cancel.h> |
22 | |
23 | int |
24 | __sigtimedwait (const sigset_t *set, siginfo_t *info, |
25 | const struct timespec *timeout) |
26 | { |
27 | sigset_t tmpset; |
28 | if (set != NULL |
29 | && (__builtin_expect (__sigismember (set, SIGCANCEL), 0) |
30 | || __builtin_expect (__sigismember (set, SIGSETXID), 0))) |
31 | { |
32 | /* Create a temporary mask without the bit for SIGCANCEL set. */ |
33 | // We are not copying more than we have to. |
34 | memcpy (&tmpset, set, _NSIG / 8); |
35 | __sigdelset (&tmpset, SIGCANCEL); |
36 | __sigdelset (&tmpset, SIGSETXID); |
37 | set = &tmpset; |
38 | } |
39 | |
40 | /* XXX The size argument hopefully will have to be changed to the |
41 | real size of the user-level sigset_t. */ |
42 | int result = SYSCALL_CANCEL (rt_sigtimedwait, set, info, timeout, _NSIG / 8); |
43 | |
44 | /* The kernel generates a SI_TKILL code in si_code in case tkill is |
45 | used. tkill is transparently used in raise(). Since having |
46 | SI_TKILL as a code is useful in general we fold the results |
47 | here. */ |
48 | if (result != -1 && info != NULL && info->si_code == SI_TKILL) |
49 | info->si_code = SI_USER; |
50 | |
51 | return result; |
52 | } |
53 | libc_hidden_def (__sigtimedwait) |
54 | weak_alias (__sigtimedwait, sigtimedwait) |
55 | |