1 | /* Linux pause syscall implementation. |
2 | Copyright (C) 2017-2018 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library. If not, see |
17 | <http://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <signal.h> |
20 | #include <unistd.h> |
21 | #include <sysdep-cancel.h> |
22 | #include <not-cancel.h> |
23 | |
24 | /* Suspend the process until a signal arrives. |
25 | This always returns -1 and sets errno to EINTR. */ |
26 | int |
27 | __libc_pause (void) |
28 | { |
29 | #ifdef __NR_pause |
30 | return SYSCALL_CANCEL (pause); |
31 | #else |
32 | return SYSCALL_CANCEL (ppoll, NULL, 0, NULL, NULL); |
33 | #endif |
34 | } |
35 | weak_alias (__libc_pause, pause) |
36 | |
37 | int |
38 | __pause_nocancel (void) |
39 | { |
40 | #ifdef __NR_pause |
41 | return INLINE_SYSCALL_CALL (pause); |
42 | #else |
43 | return INLINE_SYSCALL_CALL (ppoll, NULL, 0, NULL, NULL); |
44 | #endif |
45 | } |
46 | libc_hidden_def (__pause_nocancel) |
47 | |