1 | /* Copyright (C) 1991-2017 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 | #define sigpause __rename_sigpause |
19 | #include <errno.h> |
20 | #include <signal.h> |
21 | #include <stddef.h> /* For NULL. */ |
22 | #include <sysdep-cancel.h> |
23 | #undef sigpause |
24 | |
25 | #include <sigset-cvt-mask.h> |
26 | |
27 | /* Set the mask of blocked signals to MASK, |
28 | wait for a signal to arrive, and then restore the mask. */ |
29 | static int |
30 | do_sigpause (int sig_or_mask, int is_sig) |
31 | { |
32 | sigset_t set; |
33 | |
34 | if (is_sig != 0) |
35 | { |
36 | /* The modern X/Open implementation is requested. */ |
37 | if (__sigprocmask (0, NULL, &set) < 0 |
38 | || sigdelset (&set, sig_or_mask) < 0) |
39 | return -1; |
40 | } |
41 | else if (sigset_set_old_mask (&set, sig_or_mask) < 0) |
42 | return -1; |
43 | |
44 | /* Note the sigpause() is a cancellation point. But since we call |
45 | sigsuspend() which itself is a cancellation point we do not have |
46 | to do anything here. */ |
47 | return __sigsuspend (&set); |
48 | } |
49 | |
50 | int |
51 | __sigpause (int sig_or_mask, int is_sig) |
52 | { |
53 | if (SINGLE_THREAD_P) |
54 | return do_sigpause (sig_or_mask, is_sig); |
55 | |
56 | int oldtype = LIBC_CANCEL_ASYNC (); |
57 | |
58 | int result = do_sigpause (sig_or_mask, is_sig); |
59 | |
60 | LIBC_CANCEL_RESET (oldtype); |
61 | |
62 | return result; |
63 | } |
64 | libc_hidden_def (__sigpause) |
65 | |
66 | /* We have to provide a default version of this function since the |
67 | standards demand it. The version which is a bit more reasonable is |
68 | the BSD version. So make this the default. */ |
69 | int |
70 | __attribute__ ((weak)) |
71 | __default_sigpause (int mask) |
72 | { |
73 | return __sigpause (mask, 0); |
74 | } |
75 | #undef sigpause |
76 | weak_alias (__default_sigpause, sigpause) |
77 | strong_alias (__default_sigpause, __libc_sigpause) |
78 | |
79 | |
80 | /* We have to provide a default version of this function since the |
81 | standards demand it. The version which is a bit more reasonable is |
82 | the BSD version. So make this the default. */ |
83 | int |
84 | __attribute__ ((weak)) |
85 | __xpg_sigpause (int sig) |
86 | { |
87 | return __sigpause (sig, 1); |
88 | } |
89 | strong_alias (__xpg_sigpause, __libc___xpg_sigpause) |
90 | |