1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #pragma once
30
31 #include <sys/cdefs.h>
32
33 #include <signal.h>
34
35 #include "bionic_macros.h"
36
37 // Realtime signals reserved for internal use:
38 // 32 (__SIGRTMIN + 0) POSIX timers
39 // 33 (__SIGRTMIN + 1) libbacktrace
40 // 34 (__SIGRTMIN + 2) libcore
41 // 35 (__SIGRTMIN + 3) debuggerd -b
42 // 36 (__SIGRTMIN + 4) heapprofd
43 // 37 (__SIGRTMIN + 5) coverage (libprofile-extras)
44 //
45 // If you change this, also change __ndk_legacy___libc_current_sigrtmin
46 // in <android/legacy_signal_inlines.h> to match.
47
48 #define __SIGRT_RESERVED 6
filter_reserved_signals(sigset64_t sigset,int how)49 static inline __always_inline sigset64_t filter_reserved_signals(sigset64_t sigset, int how) {
50 int (*block)(sigset64_t*, int);
51 int (*unblock)(sigset64_t*, int);
52 switch (how) {
53 case SIG_BLOCK:
54 __BIONIC_FALLTHROUGH;
55 case SIG_SETMASK:
56 block = sigaddset64;
57 unblock = sigdelset64;
58 break;
59
60 case SIG_UNBLOCK:
61 block = sigdelset64;
62 unblock = sigaddset64;
63 break;
64 }
65
66 // The POSIX timer signal must be blocked.
67 block(&sigset, __SIGRTMIN + 0);
68
69 // Everything else must remain unblocked.
70 unblock(&sigset, __SIGRTMIN + 1);
71 unblock(&sigset, __SIGRTMIN + 2);
72 unblock(&sigset, __SIGRTMIN + 3);
73 unblock(&sigset, __SIGRTMIN + 4);
74 unblock(&sigset, __SIGRTMIN + 5);
75 return sigset;
76 }
77