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From: lau@kings.wharton.upenn.edu (Yan K. Lau)
Newsgroups: comp.sys.apollo
Subject: Discrepancy in sio.h file?
Message-ID: <12447@netnews.upenn.edu>
Date: 27 Jun 89 16:30:51 GMT
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Reply-To: lau@kings.wharton.upenn.edu (Yan K. Lau)
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This is a technical question about the C compiler and the Apollo sio
include file.  There seems to be a discrepancy between parameter lists.

In /usr/apollo/include/sio.h, the sio_$control call is defined as follows:

    extern void sio_$control(
            stream_$id_t          &stream_id,
            sio_$opt_t            &option,
            void                  &value,
            status_$t             *status
            );

BTW, In /sys/ins/sio.ins.c, the call is defined simply as:

    std_$call void sio_$control();

In comparison, in /sys/ins/sio.ins.pas, the call is defined as:

    PROCEDURE sio_$control(IN strid: stream_$id_t;
                           IN option: sio_$opt_t;
                           IN value: UNIV sio_$value_t;
                           OUT status: status_$t); EXTERN;

The _Domain/OS Call Reference_, defines the call as follows:

    extern void sio_$control(
            stream_$id_t          &stream_id,
            sio_$opt_t            &option,
            sio_$value_t          &value,
            status_$t             *status
            );

The definition of sio_$value_t is:

    typedef union {
            char c;
            pinteger i;
            char b;        /* boolean */
            sio_$err_enables_t es;
    } sio_$value_t;


It appears that the third parameter in /usr/apollo/include/sio.h is wrong.
Is this true?  If so, what other "gotchas" are out there?  This gives me
an uneasy feeling.  Has anyone else encounter similar problems?



Yan.
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