Interpose-able code to catch crashes, print, and exit cleanly. Check near line 106 https://opensource.apple.com/source/libclosure/libclosure-67/objectTests/test.pl

crashcatch.c

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

// from dyld-interposing.h
#define DYLD_INTERPOSE(_replacement,_replacee) __attribute__((used)) static struct{ const void* replacement; const void* replacee; } _interpose_##_replacee __attribute__ ((section ("__DATA,__interpose"))) = { (const void*)(unsigned long)&_replacement, (const void*)(unsigned long)&_replacee };

static void catchcrash(int sig) 
{
    const char *msg;
    switch (sig) {
    case SIGILL:  msg = "CRASHED: SIGILL";  break;
    case SIGBUS:  msg = "CRASHED: SIGBUS";  break;
    case SIGSYS:  msg = "CRASHED: SIGSYS";  break;
    case SIGSEGV: msg = "CRASHED: SIGSEGV"; break;
    case SIGTRAP: msg = "CRASHED: SIGTRAP"; break;
    case SIGABRT: msg = "CRASHED: SIGABRT"; break;
    default: msg = "unknown signal"; break;
    }
    fprintf(stderr, "%s\n", msg);

    void *array[10];
    size_t size;

    size = backtrace(array, 10);

    fprintf(stderr, "Stack trace:\n");
    backtrace_symbols_fd(array, size, STDERR_FILENO);
    _exit(1);
}

static void setupcrash(void) __attribute__((constructor));
static void setupcrash(void) 
{
    signal(SIGILL, &catchcrash);
    signal(SIGBUS, &catchcrash);
    signal(SIGSYS, &catchcrash);
    signal(SIGSEGV, &catchcrash);
    signal(SIGTRAP, &catchcrash);
    signal(SIGABRT, &catchcrash);
}

static int hacked = 0;
ssize_t hacked_write(int fildes, const void *buf, size_t nbyte)
{
    if (!hacked) {
        setupcrash();
        hacked = 1;
    }
    return write(fildes, buf, nbyte);
}

DYLD_INTERPOSE(hacked_write, write);

either compile as an individual library or an object

$ cc jbat.c crashcatch.c -o jbat -framework IOKit -framework CoreFoundation

an example of what to expect:

$ ./jbat

jbat(51312,0x100c48580) malloc: *** error for object 0x100908010: pointer being freed was not allocated
jbat(51312,0x100c48580) malloc: *** set a breakpoint in malloc_error_break to debug
CRASHED: SIGABRT
Stack trace:
0   jbat                                0x0000000100903c90 catchcrash + 232
1   libsystem_platform.dylib            0x0000000186dc04e4 _sigtramp + 56
2   libsystem_pthread.dylib             0x0000000186da8eb0 pthread_kill + 288
3   libsystem_c.dylib                   0x0000000186ce6314 abort + 164
4   libsystem_malloc.dylib              0x0000000186bcba1c has_default_zone0 + 0
5   libsystem_malloc.dylib              0x0000000186bcf060 malloc_report + 64
6   libsystem_malloc.dylib              0x0000000186bbdfa8 free + 500
7   jbat                                0x0000000100903b30 main + 84
8   dyld                                0x0000000100bd50f4 start + 520