Re: [Caml-list] Camlidl and order of include files

[Dmitry Bely <dbely@mail.ru>]

John Gerard Malecki <johnm@artisan.com> writes:

> I just tried camlidl and am not sure if I am using it wrong or if I
> have encountered a bug.  I want to access the (solaris) sysconf system
> routine to find out how many processors on a machine.  I wrote this
> idl file
> 
>   quote(C,"#include <unistd.h>")
>   
>   enum sysconf_names {
>     SC_NPROCESSOR_ONLN = _SC_NPROCESSORS_ONLN
>   };


Use quote(h,"#include <unistd.h>")

and then C stubs will compile, but your code still will be incorrect. How
the generated Caml part will know the value of _SC_NPROCESSORS_ONLN?
Obviously, it is not defined for Camlidl. It should generate an error
message here. It does not, and that's the bug in Camlidl (you can submit a
bug report). As for correct solution, you should either convert <unistd.h>
to IDL and then use

#include unistd.idl
   
enum sysconf_names {
   SC_NPROCESSOR_ONLN = _SC_NPROCESSORS_ONLN
};

or resolve _SC_NPROCESSORS_ONLN macro manually:

quote(C,"#include <unistd.h>")

enum sysconf_names {
   SC_NPROCESSOR_ONLN = 9
};

Hope to hear from you soon,
Dmitry


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