Charlie Kester wrote:
On Wed 11 Nov 2009 at 17:32:41 PST Charlie Kester wrote:

One more thing:

Notice that the system call number (or any other dword) should also be
pushed onto the stack before the int 80h.

The reason for this is given at the top of the page:

   although the kernel is accessed using int 80h, it is assumed the
   program will call a function that issues int 80h, rather than issuing
   int 80h directly.

So the extra dword pushed onto the stack takes the place of the return
address from the function the kernel expects to have been called. And since you're not actually using as a return address, it doesn't
matter what value it actually has.  The kernel doesn't use it for
anything; it just expects it to be there in a properly arranged stack

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The push eax is what made it work. So that was the problem. Stdin and stdout do not need to opened before they are used, as in C. Thank you everyone for your help on this, that solved it.

Here is the code that works:
       section .data
       hello   db      'Hello, World!', 0xa
       hbytes  equ     $ - hello

       section .text
       global  _start
       push    dword hbytes
       push    dword hello
       push    dword 1
       mov eax,0x4
       push eax
       int 0x80
       add esp,16

       push    dword 0
       mov eax,0x1
       push eax
       int 0x80

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