Lynux-Penguin + and others, _asm_?

hey, you told me to do this to kill a program:
_asm_(" mem.addrss. here ") and i did it, and it worked! BUT that was the only time it worked, i didn't save the prog. caue i was testing it. but when i rewrote it, it didn't work, i tried thosands of times and then all of a sudden it worked 1 time again. but again it's not working agian. please help

it is two _'s
example:

Code:

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void main() {
__asm__("
        jmp    0x1f                    # 2 bytes
        popl  %esi                    # 1 byte
        movl  %esi,0x8(%esi)          # 3 bytes
        xorl  %eax,%eax                # 2 bytes
        movb  %eax,0x7(%esi)                # 3 bytes
        movl  %eax,0xc(%esi)          # 3 bytes
        movb  $0xb,%al                # 2 bytes
        movl  %esi,%ebx                # 2 bytes
        leal  0x8(%esi),%ecx          # 3 bytes
        leal  0xc(%esi),%edx          # 3 bytes
        int    $0x80                    # 2 bytes
        xorl  %ebx,%ebx                # 2 bytes
        movl  %ebx,%eax                # 2 bytes
        inc    %eax                    # 1 bytes
        int    $0x80                    # 2 bytes
        call  -0x24                    # 5 bytes
        .string \"/bin/sh\"            # 8 bytes
                                        # 46 bytes total
");
}

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