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From: tgl@zog.cs.cmu.edu (Tom Lane)
Newsgroups: comp.sys.hp
Subject: Bug in HPUX 7.0 Series 300 iomap(7)
Message-ID: <9485@pt.cs.cmu.edu>
Date: 31 May 90 23:42:42 GMT
Distribution: usa
Organization: Carnegie-Mellon University, CS/RI
Lines: 22

I've found that the IOMAPMAP ioctl() request doesn't behave very
well if one hands it a file descriptor for a device special file
that is *not* an iomap(7) file (i.e., major number not 10).

If the file descriptor is for /dev/tty, the ioctl() call fails with
a return value of 0, rather than -1 as specified in the ioctl(2)
man page.  Not only that, but it neglects to set errno.

I've also tried other types of special files and gotten
errno=EINVAL, rather than ENOTTY as I would expect from the
iomap(7) man page.  Could this indicate that IOMAPMAP is
blindly taking the minor number as an IOMAP addressing spec?

The only error case that seems to be handled reasonably is where
the file descriptor references an ordinary disk file.

-- 
				tom lane
Internet: tgl@cs.cmu.edu
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