libcatch/libcatch.c

#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <unistd.h>
#include <string.h>
#include <execinfo.h>
#include <signal.h>
#include "libcatch.h"


static char *libcatch_lastexpr = NULL;
unsigned char libcatch_behavior;
bool libcatch_faulty;



static void sighandler(int signal, siginfo_t *si, void *arg) {
	size_t size;
	void *array[10];
	size = backtrace(array, sizeof(array));
	fputs("An unexpected exception occurred\n", stderr);
	if (size) {
		backtrace_symbols_fd(array, size, STDERR_FILENO);
	}
	if (signal == SIGUSR1) {
		fprintf(stderr, "[expr]: %s\n", libcatch_lastexpr);
		perror("[errn]");
	}
	if (signal != SIGUSR1) {
		libcatch_faulty = true;
	}
	if ((signal == SIGUSR1 || libcatch_behavior > 2) && libcatch_behavior != 0) {
		fputs("Trying to continue code flow...\n", stderr);
		if (libcatch_behavior == 1 || libcatch_behavior == 3) {
			libcatch_behavior = 0;
		}
	} else {
		abort();
	}
}

void libcatch_init() {
	struct sigaction sa;
	// Prepare vars
	libcatch_lastexpr = NULL;
	libcatch_behavior = 0;
	libcatch_faulty = false;
	// Prepare sigaction
	memset(&sa, 0, sizeof(struct sigaction));
	sigemptyset(&sa.sa_mask);
	sa.sa_sigaction = sighandler;
	sa.sa_flags = SA_SIGINFO;
	// Set sigsegv handler
	sigaction(SIGSEGV, &sa, NULL);
	sigaction(SIGUSR1, &sa, NULL);
}

void throw(char *exprstr) {
	libcatch_lastexpr = exprstr;
	raise(SIGUSR1);
}