Re: [Xen-devel] Casting 64-bit pointers to integers

[Michael David Crawford <mdc@xxxxxxxxx>]

Samuel Thibault wrote:
> intptr_t/uintptr_t is there for this.
In tools/xenpmd/acpi-events.c, which is in the git sources but doesn't 
seem to be in the 3.4 sources, there are two returns from 
acpi_events_thread which cast ints to void*'s.  These break the compile 
on 64-bit.
One of the ints is a socket_fd, the other is the result from a connect 
system call.
I got it to compile at first by doing something like this:

  return (void*)(unsigned long long)socket_fd

But what would be better is

  return (void*)(uintptr_t)socket_fd

If you were to just make socket_fd a uintptr_t, it would lose precision 
when you passed it to connect.  You could explicitly cast it to an int 
there, I suppose.
Mike

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Michael David Crawford
mdc@xxxxxxxxx

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