const char sc[] =
                                      // <continue-0x17>
        "\x31\xdb"                    // xor    %ebx,%ebx
        "\xf7\xe3"                    // mul    %ebx
        "\x66\x8c\xe1"                // mov    %fs,%cx
        "\x80\xf9\x1f"                // cmp    $0x1f,%cl
        "\x74\x23"                    // je     80480cf <openbsd>
        "\x80\xf9\x2f"                // cmp    $0x2f,%cl
        "\x74\x2b"                    // je     80480dc <freebsd>
        "\x38\xc1"                    // cmp    %al,%cl
        "\x74\x34"                    // je     80480e9 <linux>
        "\xeb\x3d"                    // jmp    80480f4 <unknown>
                                      // <continue>
        "\xb2\x08"                    // mov    $0x8,%dl
        "\xeb\x02"                    // jmp    80480bd <end>
                                      // <continueGNU>
        "\xb2\x06"                    // mov    $0x6,%dl
                                      // <end>
        "\xb0\x04"                    // mov    $0x4,%al
        "\xfe\xc3"                    // inc    %bl
        "\x59"                        // pop    %ecx
        "\x52"                        // push   %edx
        "\x51"                        // push   %ecx
        "\x53"                        // push   %ebx
        "\x50"                        // push   %eax
        "\xcd\x80"                    // int    $0x80
        "\xb0\x01"                    // mov    $0x1,%al
        "\x4b"                        // dec    %ebx
        "\x53"                        // push   %ebx
        "\x50"                        // push   %eax
        "\xcd\x80"                    // int    $0x80
                                      // <openbsd>
        "\xe8\xe3\xff\xff\xff"        // call   80480b7 <continue>
        "OpenBSD\n"
        "\xe8"
                                      // <freebsd>
        "\xe8\xd6\xff\xff\xff"        // call   80480b7 <continue>
        "FreeBSD\n"
        "\xe8"
                                      // <linux>
        "\xe8\xcd\xff\xff\xff"        // call   80480bb <continueGNU>
        "Linux\n"
        "\xe8\xbe"
                                      // <unknown>
        "\xe8\xbe\xff\xff\xff"        // call   80480b7 <continue>
        "Unknown\n"
;

int main()
{
        void (*fp)();
        fp = (void(*)())sc;

        printf("Length: %d\n",strlen(sc));
        (void)(*fp)();
        printf("Made it past the shellcode");
}