80 lines
3.7 KiB
C
80 lines
3.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/bits.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/sigbits.h"
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#include "libc/calls/typedef/sigaction_f.h"
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#include "libc/dce.h"
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#include "libc/log/internal.h"
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#include "libc/log/log.h"
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#include "libc/log/ubsan.internal.h"
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#include "libc/macros.h"
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#include "libc/nt/signals.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/sa.h"
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#include "libc/sysv/consts/sig.h"
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STATIC_YOINK("__die");
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STATIC_YOINK("__ubsan_abort");
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extern const unsigned char __oncrash_thunks[7][11];
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/**
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* Installs crash signal handlers.
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*
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* Normally, only functions calling die() will print backtraces. This
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* function may be called at program startup to install handlers that
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* will display similar information, for most types of crashes.
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*
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* - Backtraces
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* - CPU state printout
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* - Automatic debugger attachment
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*
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* Another trick this function enables, is you can press CTRL+\ to open
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* the debugger GUI at any point while the program is running. It can be
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* useful, for example, if a program is caught in an infinite loop.
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*
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* @see callexitontermination()
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*/
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void showcrashreports(void) {
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size_t i;
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struct sigaction sa;
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/* <SYNC-LIST>: oncrashthunks.S */
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kCrashSigs[0] = SIGQUIT; /* ctrl+\ aka ctrl+break */
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kCrashSigs[1] = SIGFPE; /* 1 / 0 */
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kCrashSigs[2] = SIGILL; /* illegal instruction */
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kCrashSigs[3] = SIGSEGV; /* bad memory access */
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kCrashSigs[4] = SIGTRAP; /* bad system call */
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kCrashSigs[5] = SIGABRT; /* abort() called */
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kCrashSigs[6] = SIGBUS; /* misaligned, noncanonical ptr, etc. */
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/* </SYNC-LIST>: oncrashthunks.S */
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memset(&sa, 0, sizeof(sa));
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sa.sa_flags = SA_RESETHAND;
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sigfillset(&sa.sa_mask);
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for (i = 0; i < ARRAYLEN(kCrashSigs); ++i) {
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sigdelset(&sa.sa_mask, kCrashSigs[i]);
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}
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for (i = 0; i < ARRAYLEN(kCrashSigs); ++i) {
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if (kCrashSigs[i]) {
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sa.sa_sigaction = (sigaction_f)__oncrash_thunks[i];
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sigaction(kCrashSigs[i], &sa, &g_oldcrashacts[i]);
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}
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}
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}
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