[676] in Zephyr_Bugs
Bug report: DEC Alpha OSF 3.2
daemon@ATHENA.MIT.EDU (garvin@eos.ncsu.edu)
Fri Aug 4 09:58:57 1995
From: garvin@eos.ncsu.edu
To: bug-zephyr@MIT.EDU
Date: Fri, 4 Aug 1995 09:58:53 -0400 (EDT)
Cc: garvin@eos.ncsu.edu (Michael Arthur Garvin), mbcaudi@eos.ncsu.edu,
camattin@eos.ncsu.edu, chuck@eos.ncsu.edu
Platform:
DEC Alpha, OSF 3.2
Release:
Zephyr 2.0.2 (athena-dist.mit.edu, dist dir)
Problem:
zwrite intermittently fails, and zlocate always fails with:
zlocate: Unknown code zeph 8 while locating user garvin@EOS.NCSU.EDU
Cause:
Under OSF 3.2 longs are now 64 bits, ints are 32. "zephyr_err.h" is
created using longs, so the value stored is greater than a signed int can
contain. Checks in the code are typically against return values that are
stored in 32-bit signed ints, thus the 64-bit define will be "rolled over"
from positive to negative in the int, and the check will fail.
The error comes from lib/zephyr/ZWait4Not.c, lines 39-40:
if (retval != ZERR_NONOTICE)
return retval;
where retval is a 32-bit signed int (thus negative) and ZERR_NONOTICE is a
64-bit long (the correct positive signed value, since the 64 bit long can
hold it).
Solution:
Uncertain. I was unable to come up with a good method for casting longs
as ints, as OSF uses longs properly and this breaks intrinsic functions.
The long-term solution is to correct the data type inconsistencies since
this 32-bit/64-bit issue will come up more frequently in the future.
My hack to get things working was to take the "zephyr_err.h" from an IBM
RS/6000 (which used 32-bit signed ints, and thus had the negative values)
and recompile the code using it. Proper operation was achieved.
And thanks:
Your efforts are appreciated. This has allowed us to build a native
version for the Alpha for the first time. Thanks!
--
| Michael Garvin \ North Carolina State University College of Engineering
| Systems Programmer \ Information Technology & Engineering Computer Services
| garvin@eos.ncsu.edu \ 5 Page Hall, Box 7901 NCSU Campus, Raleigh, NC 27695
| (919) 515-5323 \ http://www.eos.ncsu.edu/staff/garvin/
