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 | static int |
32 | do_sigwait (const sigset_t *set, int *sig) |
33 | { |
34 | int ret; |
35 | |
36 | #ifdef SIGCANCEL |
37 | sigset_t tmpset; |
38 | if (set != NULL |
39 | && (__builtin_expect (__sigismember (set, SIGCANCEL), 0) |
40 | # ifdef SIGSETXID |
41 | || __builtin_expect (__sigismember (set, SIGSETXID), 0) |
42 | # endif |
43 | )) |
44 | { |
45 | /* Create a temporary mask without the bit for SIGCANCEL set. */ |
46 | // We are not copying more than we have to. |
47 | memcpy (&tmpset, set, _NSIG / 8); |
48 | __sigdelset (&tmpset, SIGCANCEL); |
49 | # ifdef SIGSETXID |
50 | __sigdelset (&tmpset, SIGSETXID); |
51 | # endif |
52 | set = &tmpset; |
53 | } |
54 | #endif |
55 | |
56 | /* XXX The size argument hopefully will have to be changed to the |
57 | real size of the user-level sigset_t. */ |
58 | #ifdef INTERNAL_SYSCALL |
59 | INTERNAL_SYSCALL_DECL (err); |
60 | do |
61 | ret = INTERNAL_SYSCALL (rt_sigtimedwait, err, 4, set, |
62 | NULL, NULL, _NSIG / 8); |
63 | while (INTERNAL_SYSCALL_ERROR_P (ret, err) |
64 | && INTERNAL_SYSCALL_ERRNO (ret, err) == EINTR); |
65 | if (! INTERNAL_SYSCALL_ERROR_P (ret, err)) |
66 | { |
67 | *sig = ret; |
68 | ret = 0; |
69 | } |
70 | else |
71 | ret = INTERNAL_SYSCALL_ERRNO (ret, err); |
72 | #else |
73 | do |
74 | ret = INLINE_SYSCALL (rt_sigtimedwait, 4, set, NULL, NULL, _NSIG / 8); |
75 | while (ret == -1 && errno == EINTR); |
76 | if (ret != -1) |
77 | { |
78 | *sig = ret; |
79 | ret = 0; |
80 | } |
81 | else |
82 | ret = errno; |
83 | #endif |
84 | |
85 | return ret; |
86 | } |
87 | |
88 | int |
89 | __sigwait (const sigset_t *set, int *sig) |
90 | { |
91 | if (SINGLE_THREAD_P) |
92 | return do_sigwait (set, sig); |
93 | |
94 | int oldtype = LIBC_CANCEL_ASYNC (); |
95 | |
96 | int result = do_sigwait (set, sig); |
97 | |
98 | LIBC_CANCEL_RESET (oldtype); |
99 | |
100 | return result; |
101 | } |
102 | libc_hidden_def (__sigwait) |
103 | weak_alias (__sigwait, sigwait) |
104 | #else |
105 | # include <sysdeps/posix/sigwait.c> |
106 | #endif |
107 | strong_alias (__sigwait, __libc_sigwait) |
108 | |