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From: lutz@iks-jena.de (Lutz Donnerhacke)
Newsgroups: comp.lang.ada
Subject: Re: Wrapping / Interfacing to C macros
Date: Fri, 23 Aug 2002 10:18:39 +0000 (UTC)
Organization: IKS GmbH Jena
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Date: 2002-08-23T10:18:39+00:00
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* Le Snelson wrote:
>I'm hoping someone has seen a dialect or pattern for interfacing to C
>macros.  I need to use the ioctl() mechanisms of VxWorks to control
>some low level features of a couple of serial cards.  I've never seen
>any Ada applications wrapping up linguistic attributes such as the
>following from Tornado/target/h/sys/ioctl.h :
>
>#define  _IO(x,y)     (IOC_VOID|((x)<<8)|y)
>#define  _IOR(x,y,t)  (IOC_OUT|((sizeof(t)&IOCPARM_MASK)<<16)|((x)<<8)|y)
>#define  _IOW(x,y,t)  (IOC_IN|((sizeof(t)&IOCPARM_MASK)<<16)|((x)<<8)|y)
>/* this should be _IORW, but stdio got there first */
>#define  _IOWR(x,y,t)  (IOC_INOUT|((sizeof(t)&IOCPARM_MASK)<<16)|((x)<<8)|y)
>
>#define  SIOCSHIWAT  _IOW('s',  0, int)    /* set high watermark */
>#define  SIOCGHIWAT  _IOR('s',  1, int)    /* get high watermark */
>#define  SIOCSLOWAT  _IOW('s',  2, int)    /* set low watermark */
>#define  SIOCGLOWAT  _IOR('s',  3, int)    /* get low watermark */
>#define  SIOCATMARK  _IOR('s',  7, int)    /* at oob mark? */

I usually prefer to define the type in Ada without looking at the C code.

type io_t (c : ioc_t) is record
   x : x_t;
   y : y_t;
   t : iocparam_t;
end record;
for io_t use record
   c at 0 range 24 .. 31;
   t at 0 range 16 .. 23;
   x at 0 range 7 .. 15;
   y at 0 range 0 .. 7;
end record;
for io_t'Bit_Order use ...;

procedure SIOCSHIWAT (level : ...);
function SIOCGHIWAT return ...;