IBIS on Sun's 2.0

[whm at bocklin.UUCP]

I recently tried installing IBIS on some Suns with 2.0 and ran into a
couple of problems.  The most serious problem encountered dealt with
reading directories.  We don't have the source for 2.0 yet, but from
adb it looks like readdir() is essentially just a front-end for
getdirentries().  Since it looks like getdirentries was added for
the NFS, I elected to ignore it for the moment and just get readdir
et. al working based on the sources supplied with IBIS.

It turns out that Sun changed the _dirdesc structure described in dir(5)
to have some extra fields and also changed the buffer element from

	char dd_buf[DIRBLKSIZ];
to
	char *dd_buf;
	
So, when compiling the IBIS code with the Sun header files, dd_buf ends up
being a null pointer.  I added code to opendir to malloc DIRBLKSIZ bytes
and assign the pointer to dd_buf, and code to closedir to free the block.

Here are the new versions.

/*
 * open a directory.
 */
DIR *
opendir(name)
	char *name;
{
	register DIR *dirp;
	register int fd;

	if ((fd = open(name, 0)) == -1)
		return NULL;
	if ((dirp = (DIR *)malloc(sizeof(DIR))) == NULL) {
		close (fd);
		return NULL;
	}
	dirp->dd_fd = fd;
	dirp->dd_loc = 0;
>>#ifdef sun
>>	if ((dirp->dd_buf = (char *)malloc(DIRBLKSIZ)) == NULL) {
>>		close (fd);
>>		return NULL;
>>		}
>>#endif sun
	return dirp;
}

/*
 * close a directory.
 */
void
closedir(dirp)
	register DIR *dirp;
{
	close(dirp->dd_fd);
	dirp->dd_fd = -1;
	dirp->dd_loc = 0;
>>#ifdef sun
>>	free(dirp->dd_buf);
>>#endif sun
	free(dirp);
}

I hacked the missing definition of DIRBLKSIZ on the Suns by wildly using
-DDIRBLKSIZE=512 as needed.

This makes things such as ls and "cp -r" work and it also makes getwd()
work.  (The broken getwd() makes references such as "sunhost:." not work.)

rcsh sort of works, but it core dumps a lot.  I haven't gotten a chance to
investigate this yet and may put it on hold until we get the Sun 2.0
sources.

The version of diff supplied with IBIS core dumps on the Suns, but I also
found that Sun's diff from 1.1 (source, that is) dumps out even when the
IBIS routines are not linked in, so I'm going to wait on the 2.0 source
before investigating this further.

I'd be interested in hearing from anyone else who has brought up IBIS
on 2.0 Suns.  I'm particularly interested in hearing from anyone who
has gotten rcsh fully working.

					Bill Mitchell
					whm%arizona at csnet-relay
					{ihnp4,noao,mcnc,utah-cs}!arizona!whm