#include <sys/mman.h>
#include <unistd.h>
#include <stdint.h>
#include <stddef.h>

void patch(void* addr, uint8_t* data, size_t len) {
    size_t pagesize = sysconf(_SC_PAGESIZE);
    uintptr_t page_start = (uintptr_t)addr & ~(pagesize - 1);
    mprotect((void*)page_start, pagesize * 2, PROT_READ | PROT_WRITE | PROT_EXEC);
    for (size_t i = 0; i < len; ++i) {
        ((uint8_t*)addr)[i] = data[i];
    }
}

int main() {
    void* target = (void*)main; 
    uint8_t code[] = {0x90, 0x90, 0x90}; // NOPs

    patch(target, code, 3);

    return 0;
}