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From: resnick@cogsci.uiuc.edu (Pete Resnick)
Newsgroups: comp.os.minix,comp.sys.mac.comm
Subject: Re: comms problem, error code=-17
Message-ID: <1991Feb17.233552.20396@ux1.cso.uiuc.edu>
Date: 17 Feb 91 23:35:52 GMT
References: <1991Feb15.124615.15460@ukpoit.co.uk>
Sender: news@ux1.cso.uiuc.edu (News)
Organization: University of Illinois at Urbana
Lines: 28

paul@ukpoit.co.uk (Paul Wood) writes:

>What does -17 indicate? All I can find in the documentation is "control error"!

>MacMinix gets this problem after a PBControl call, as follows:
>if((err = PBControl(&pb, 0)) != 0)
>  printf("error %d setting line parameters on serial line %d\n",err,rs->minor);

Device Drivers 101. PBControl sends a block of memory (pb in this case) to
the device driver in question. In this block of memory (called, suprisingly
enough, a control block) is a field called csCode, which tells the driver
what action it is supposed to perform on this block of memory. csCode is
a word at byte offset 26. The error -17 indicates that the driver does
not recognize the csCode being set to it. More often than not, that means
that whatever is calling this device driver (MacMinix in this case) is
depending on a different version of the device driver (I assume the serial
driver in this case) than the one that actually exists. You might want
to see what the value of csCode is and check it against the codes that
the serial driver expects to see. You may find that an old version of the
driver didn't use a certain code, whereas a newer version does.

pr
--
Pete Resnick             (...so what is a mojo, and why would one be rising?)
Graduate assistant - Philosophy Department, Gregory Hall, UIUC
System manager - Cognitive Science Group, Beckman Institute, UIUC
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