Enrico Fraccaroli
81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
/// @file abort.c
|
|
/// @brief
|
|
/// @copyright (c) 2014-2022 This file is distributed under the MIT License.
|
|
/// See LICENSE.md for details.
|
|
|
|
#include "sys/unistd.h"
|
|
#include "string.h"
|
|
#include "signal.h"
|
|
#include "stdio.h"
|
|
|
|
/// @brief Since there could be signal handlers listening for the abort, we need
|
|
/// to keep track at which stage of the abort we are.
|
|
static int stage = 0;
|
|
|
|
void abort(void)
|
|
{
|
|
sigaction_t action;
|
|
sigset_t sigset;
|
|
|
|
/* Unblock SIGABRT. */
|
|
if (stage == 0) {
|
|
++stage;
|
|
|
|
sigemptyset(&sigset);
|
|
sigaddset(&sigset, SIGABRT);
|
|
sigprocmask(SIG_UNBLOCK, &sigset, 0);
|
|
}
|
|
|
|
/* Send signal which possibly calls a user handler. */
|
|
if (stage == 1) {
|
|
|
|
// We must allow recursive calls of abort
|
|
int save_stage = stage;
|
|
|
|
stage = 0;
|
|
kill(getpid(), SIGABRT);
|
|
stage = save_stage + 1;
|
|
}
|
|
|
|
/* There was a handler installed. Now remove it. */
|
|
if (stage == 2) {
|
|
++stage;
|
|
|
|
memset(&action, 0, sizeof(action));
|
|
|
|
action.sa_handler = SIG_DFL;
|
|
sigemptyset(&action.sa_mask);
|
|
action.sa_flags = 0;
|
|
|
|
sigaction(SIGABRT, &action, NULL);
|
|
}
|
|
|
|
/* Try again. */
|
|
if (stage == 3) {
|
|
++stage;
|
|
|
|
kill(getpid(), SIGABRT);
|
|
}
|
|
|
|
/* Now try to abort using the system specific command. */
|
|
if (stage == 4) {
|
|
++stage;
|
|
|
|
__asm__ __volatile__("hlt");
|
|
}
|
|
|
|
/* If we can't signal ourselves and the abort instruction failed, exit. */
|
|
if (stage == 5) {
|
|
++stage;
|
|
|
|
exit(127);
|
|
}
|
|
|
|
// If even this fails try to use the provided instruction to crash
|
|
// or otherwise make sure we never return.
|
|
#pragma clang diagnostic push
|
|
#pragma ide diagnostic ignored "EndlessLoop"
|
|
while (1) __asm__ __volatile__("hlt");
|
|
#pragma clang diagnostic pop
|
|
}
|