Someone off list suggested I stop using /r and instead append a 13 to 
the end of the string.
This changes the error to:

BOUNDS VIOLATION   (FSERR 73)
Invalid message level - expected 0, 1, 2. (CIWARN 9007)
û ÙPSHOWTIME > TIME.GECS.SYS
Invalid first character in command name. (CIERR 9090)
New Err -15361 9090

The code now looks like:
int     main (int arg,char* argv[])
{
        short cmderror;
        short parmnum;
        char  cmdbuf[256];
        memset(cmdbuf, 0, 256);
        strcpy(cmdbuf, "SHOWTIME > TIME.GECS.SYS");
        *(cmdbuf + strlen(cmdbuf)) = (char)13;
        HPCICOMMAND(cmdbuf, &cmderror, &parmnum);
        printf("New Err %d %d\n", cmderror, parmnum);

return 0;
}

This is even more confusing, this is just a normal ascii string.



Keven Miller (rtt) wrote:
> Daniel Griffin wrote:
>>        HPCICOMMAND("SHOWTIME > TIME.GECS.SYS\r", &cmderror, &parmnum);
>>
>> I am compiling on version 6.5 in the Posix shell using GCC. (The 
>> source is obviously C and has to remain C). Is this a bug or am I 
>> doing something wrong? I have tried a variety of command lines and 
>> different string formats with no effect.
>
> Because your using GCC, beware of system intrinsics that have documented
> (and undocumented) optional parameters.
>
> HICICOMMAND has 4 parameters. Although the intrinsic manual says
> the last two are optional, GCC doesn't know that.
> So you have to provide the missing parameters or mask or which ever
> the intrinsic is looking for.
>
> Note that parm 4 does say it defaults to a value of 0.
> So
>    HPCICOMMAND("SHOWTIME > TIME.GECS.SYS\r", &cmderror, &parmnum, 0 );
>
> should work in this case.
>
> Keven
>
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