81 lines
3.8 KiB
C
81 lines
3.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ This program is free software; you can redistribute it and/or modify │
|
|
│ it under the terms of the GNU General Public License as published by │
|
|
│ the Free Software Foundation; version 2 of the License. │
|
|
│ │
|
|
│ This program is distributed in the hope that it will be useful, but │
|
|
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
|
|
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
|
|
│ General Public License for more details. │
|
|
│ │
|
|
│ You should have received a copy of the GNU General Public License │
|
|
│ along with this program; if not, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/bits/bits.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/sigbits.h"
|
|
#include "libc/calls/typedef/sigaction_f.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/log/internal.h"
|
|
#include "libc/log/log.h"
|
|
#include "libc/log/ubsan.internal.h"
|
|
#include "libc/macros.h"
|
|
#include "libc/nt/signals.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/consts/sa.h"
|
|
#include "libc/sysv/consts/sig.h"
|
|
|
|
STATIC_YOINK("__die");
|
|
STATIC_YOINK("__ubsan_abort");
|
|
|
|
extern const unsigned char __oncrash_thunks[7][11];
|
|
|
|
/**
|
|
* Installs crash signal handlers.
|
|
*
|
|
* Normally, only functions calling die() will print backtraces. This
|
|
* function may be called at program startup to install handlers that
|
|
* will display similar information, for most types of crashes.
|
|
*
|
|
* - Backtraces
|
|
* - CPU state printout
|
|
* - Automatic debugger attachment
|
|
*
|
|
* Another trick this function enables, is you can press CTRL+\ to open
|
|
* the debugger GUI at any point while the program is running. It can be
|
|
* useful, for example, if a program is caught in an infinite loop.
|
|
*
|
|
* @see callexitontermination()
|
|
*/
|
|
void showcrashreports(void) {
|
|
size_t i;
|
|
struct sigaction sa;
|
|
/* <SYNC-LIST>: oncrashthunks.S */
|
|
kCrashSigs[0] = SIGQUIT; /* ctrl+\ aka ctrl+break */
|
|
kCrashSigs[1] = SIGFPE; /* 1 / 0 */
|
|
kCrashSigs[2] = SIGILL; /* illegal instruction */
|
|
kCrashSigs[3] = SIGSEGV; /* bad memory access */
|
|
kCrashSigs[4] = SIGTRAP; /* bad system call */
|
|
kCrashSigs[5] = SIGABRT; /* abort() called */
|
|
kCrashSigs[6] = SIGBUS; /* misaligned, noncanonical ptr, etc. */
|
|
/* </SYNC-LIST>: oncrashthunks.S */
|
|
memset(&sa, 0, sizeof(sa));
|
|
sa.sa_flags = SA_RESETHAND;
|
|
sigfillset(&sa.sa_mask);
|
|
for (i = 0; i < ARRAYLEN(kCrashSigs); ++i) {
|
|
sigdelset(&sa.sa_mask, kCrashSigs[i]);
|
|
}
|
|
for (i = 0; i < ARRAYLEN(kCrashSigs); ++i) {
|
|
if (kCrashSigs[i]) {
|
|
sa.sa_sigaction = (sigaction_f)__oncrash_thunks[i];
|
|
sigaction(kCrashSigs[i], &sa, &g_oldcrashacts[i]);
|
|
}
|
|
}
|
|
}
|