extern "C" void __gcov_dump();

//void __gcov_flush(void);
void fuzz(const char *f, int size){
        if(size < 4)
            return;

        /*close the code to test CTRL +C case
        if(f[0] == 'c'){
                if(f[1] == 'o'){
                        char* p=0;
                        *p = 0x13;//crash here
                }

        }*/
 
}
void signal_handler(int sig, siginfo_t *si, void *unused) {
    __gcov_dump(); //force create gcda

    if (sig == SIGINT) {
        exit(0);  
    }

    if (sig == SIGSEGV) {
        struct sigaction *old_sa = (struct sigaction *)unused; 
        if (old_sa && old_sa->sa_sigaction) {
            old_sa->sa_sigaction(sig, si, unused);
        }

        exit(1); 
    }
}

struct sigaction sa;
struct sigaction old_sa_segv; 

void registerSignalHandler() {
    sa.sa_sigaction = signal_handler;
    sa.sa_flags = SA_SIGINFO; 

    sigaction(SIGSEGV, NULL, &old_sa_segv); //save old SIGSEGV handler
    sigaction(SIGSEGV, &sa, NULL);// for crash event


    sigaction(SIGINT, &sa, NULL); //for CTRL +C quit
}
extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) {
    registerSignalHandler();

    return 0;
}

using namespace std;

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
    fuzz((const char *)data, size);

    return 0;
}
 
`