mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-16 18:42:39 +00:00
76 lines
3.9 KiB
C
76 lines
3.9 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 2023 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/struct/siginfo.h"
|
|
#include "libc/calls/struct/ucontext.internal.h"
|
|
#include "libc/calls/ucontext.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/intrin/describebacktrace.internal.h"
|
|
#include "libc/intrin/kprintf.h"
|
|
#include "libc/log/internal.h"
|
|
#include "libc/log/log.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/str/str.h"
|
|
|
|
/**
|
|
* Prints miniature crash report, e.g.
|
|
*
|
|
* struct sigaction sa = {
|
|
* .sa_sigaction = __minicrash,
|
|
* .sa_flags = SA_SIGINFO | SA_RESETHAND,
|
|
* };
|
|
* sigaction(SIGSEGV, &sa, 0);
|
|
*
|
|
* This function may be called from a signal handler to print vital
|
|
* information about the cause of a crash. Only vital number values
|
|
* shall be printed. The `cosmoaddr2line` command may be copied and
|
|
* pasted into the shell to obtain further details such as function
|
|
* calls and source lines in the backtrace.
|
|
*
|
|
* This function may be used as a sigaction handler, so long as the
|
|
* `SA_RESETHAND` flag is used. Using `SA_ONSTACK` is also a lovely
|
|
* feature since sigaltstack() is needed to report stack overflows.
|
|
*
|
|
* This implementation is designed to be:
|
|
*
|
|
* 1. Reliable under broken runtime states
|
|
* 2. Require only a few kB of stack
|
|
* 3. Have minimal binary footprint
|
|
*
|
|
* @see __die() for crashing from normal code without aborting
|
|
* @asyncsignalsafe
|
|
* @vforksafe
|
|
*/
|
|
relegated dontinstrument void __minicrash(int sig, siginfo_t *si, void *arg) {
|
|
char host[128];
|
|
ucontext_t *ctx = arg;
|
|
strcpy(host, "unknown");
|
|
gethostname(host, sizeof(host));
|
|
kprintf(
|
|
"%serror: %s on %s pid %d tid %d got %G%s code %d addr %p%s\n"
|
|
"cosmoaddr2line %s%s %lx %s\n",
|
|
__nocolor ? "" : "\e[1;31m", program_invocation_short_name, host,
|
|
getpid(), gettid(), sig,
|
|
__is_stack_overflow(si, ctx) ? " (stack overflow)" : "", si->si_code,
|
|
si->si_addr, __nocolor ? "" : "\e[0m", __argv[0],
|
|
endswith(__argv[0], ".com") ? ".dbg" : "", ctx ? ctx->uc_mcontext.PC : 0,
|
|
DescribeBacktrace(ctx ? (struct StackFrame *)ctx->uc_mcontext.BP
|
|
: (struct StackFrame *)__builtin_frame_address(0)));
|
|
}
|