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 "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
42 // 36 (__SIGRTMIN + 4) platform profilers (heapprofd, traced_perf)
43 // 37 (__SIGRTMIN + 5) coverage (libprofile-extras)
44 // 38 (__SIGRTMIN + 6) heapprofd ART managed heap dumps
45 // 39 (__SIGRTMIN + 7) fdtrack
46 // 40 (__SIGRTMIN + 8) android_run_on_all_threads (bionic/pthread_internal.cpp)
47 // 41 (__SIGRTMIN + 9) re-enable MTE on thread
48
49 #define BIONIC_SIGNAL_POSIX_TIMERS (__SIGRTMIN + 0)
50 #define BIONIC_SIGNAL_BACKTRACE (__SIGRTMIN + 1)
51 #define BIONIC_SIGNAL_DEBUGGER (__SIGRTMIN + 3)
52 #define BIONIC_SIGNAL_PROFILER (__SIGRTMIN + 4)
53 // When used for the dumping a heap dump, BIONIC_SIGNAL_ART_PROFILER is always handled
54 // gracefully without crashing.
55 // In debuggerd, we crash the process with this signal to indicate to init that
56 // a process has been terminated by an MTEAERR SEGV. This works because there is
57 // no other reason a process could have terminated with this signal.
58 // This is to work around the limitation of that it is not possible to get the
59 // si_code that terminated a process.
60 #define BIONIC_SIGNAL_ART_PROFILER (__SIGRTMIN + 6)
61 #define BIONIC_SIGNAL_FDTRACK (__SIGRTMIN + 7)
62 #define BIONIC_SIGNAL_RUN_ON_ALL_THREADS (__SIGRTMIN + 8)
63 #define BIONIC_ENABLE_MTE (__SIGRTMIN + 9)
64
65 #define __SIGRT_RESERVED 10
filter_reserved_signals(sigset64_t sigset,int how)66 static inline __always_inline sigset64_t filter_reserved_signals(sigset64_t sigset, int how) {
67 int (*block)(sigset64_t*, int);
68 int (*unblock)(sigset64_t*, int);
69 switch (how) {
70 case SIG_BLOCK:
71 __BIONIC_FALLTHROUGH;
72 case SIG_SETMASK:
73 block = sigaddset64;
74 unblock = sigdelset64;
75 break;
76
77 case SIG_UNBLOCK:
78 block = sigdelset64;
79 unblock = sigaddset64;
80 break;
81 }
82
83 // The POSIX timer signal must be blocked.
84 block(&sigset, __SIGRTMIN + 0);
85
86 // Everything else must remain unblocked.
87 unblock(&sigset, __SIGRTMIN + 1);
88 unblock(&sigset, __SIGRTMIN + 2);
89 unblock(&sigset, __SIGRTMIN + 3);
90 unblock(&sigset, __SIGRTMIN + 4);
91 unblock(&sigset, __SIGRTMIN + 5);
92 unblock(&sigset, __SIGRTMIN + 6);
93 unblock(&sigset, __SIGRTMIN + 7);
94 unblock(&sigset, __SIGRTMIN + 8);
95 unblock(&sigset, __SIGRTMIN + 9);
96 return sigset;
97 }
98