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https://github.com/jart/cosmopolitan.git
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dc0ea6640e
This change makes further effort towards improving our poll() implementation on the New Technology. The stdin worker didn't work out so well for Python so it's not being used for now. System call tracing with the --strace flag should now be less noisy now on Windows unless you modify the strace.internal.h defines to turn on some optional ones that are most useful for debugging the system call wrappers.
84 lines
4.1 KiB
C
84 lines
4.1 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/calls/sigbits.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/calls/struct/sigaltstack.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/macros.internal.h"
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#include "libc/runtime/symbols.internal.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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#include "libc/sysv/consts/ss.h"
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STATIC_YOINK("__die"); /* for backtracing */
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STATIC_YOINK("malloc_inspect_all"); /* for asan memory origin */
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STATIC_YOINK("__get_symbol_by_addr"); /* for asan memory origin */
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extern const unsigned char __oncrash_thunks[8][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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struct sigaltstack ss;
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/* <SYNC-LIST>: showcrashreports.c, oncrashthunks.S, oncrash.c */
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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>: showcrashreports.c, oncrashthunks.S, oncrash.c */
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bzero(&sa, sizeof(sa));
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ss.ss_flags = 0;
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ss.ss_size = SIGSTKSZ;
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ss.ss_sp = malloc(SIGSTKSZ);
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__cxa_atexit(free, ss.ss_sp, 0);
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sa.sa_flags = SA_SIGINFO | SA_NODEFER | SA_ONSTACK;
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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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if (!IsWindows()) sigaltstack(&ss, 0);
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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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GetSymbolTable();
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}
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