[Bug breakpoints/31599] [gdb] setting breakpoint prevents value being from written to address via read

["k4lizen at proton dot me" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31599

--- Comment #3 from k4lizen <k4lizen at proton dot me> ---
(In reply to Tom Tromey from comment #2)
> > When a break point for 0x0804a060 is set (and enabled), the `read` call doesn't actually read the first byte of the input
> 
> I wonder what it returns and if it sets errno.

It sets eax to the number of bytes it read (and as if it actually read the
first byte, if the breakpoint is set, even though it didnt). It doesn't set
errno (although errno itself is set for me from the printf call (which does
actually print, so I don't know what thats about)).

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