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Marcel Moolenaar 2c42a14602 sigset_t change (part 2 of 5) 
-----------------------------

The core of the signalling code has been rewritten to operate
on the new sigset_t. No methodological changes have been made.
Most references to a sigset_t object are through macros (see
signalvar.h) to create a level of abstraction and to provide
a basis for further improvements.

The NSIG constant has not been changed to reflect the maximum
number of signals possible. The reason is that it breaks
programs (especially shells) which assume that all signals
have a non-null name in sys_signame. See src/bin/sh/trap.c
for an example. Instead _SIG_MAXSIG has been introduced to
hold the maximum signal possible with the new sigset_t.

struct sigprop has been moved from signalvar.h to kern_sig.c
because a) it is only used there, and b) access must be done
though function sigprop(). The latter because the table doesn't
holds properties for all signals, but only for the first NSIG
signals.

signal.h has been reorganized to make reading easier and to
add the new and/or modified structures. The "old" structures
are moved to signalvar.h to prevent namespace polution.

Especially the coda filesystem suffers from the change, because
it contained lines like (p->p_sigmask == SIGIO), which is easy
to do for integral types, but not for compound types.

NOTE: kdump (and port linux_kdump) must be recompiled.

Thanks to Garrett Wollman and Daniel Eischen for pressing the
importance of changing sigreturn as well.
1999-09-29 15:03:48 +00:00
..
00READ Update 1998-10-28 19:39:12 +00:00
cnode.h $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda.h $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda_fbsd.c Remove five now unused fields from struct cdevsw. They should never 1999-09-25 18:24:47 +00:00
coda_io.h $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda_kernel.h $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda_namecache.c $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda_namecache.h $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda_opstats.h $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda_pioctl.h $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda_psdev.c sigset_t change (part 2 of 5) 1999-09-29 15:03:48 +00:00
coda_psdev.h $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda_subr.c $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda_subr.h $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda_venus.c $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda_venus.h $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda_vfsops.c Seperate the export check in VFS_FHTOVP, exports are now checked via 1999-09-11 00:46:08 +00:00
coda_vfsops.h $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda_vnops.c $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
coda_vnops.h $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
README Pass2 complete 1998-09-02 19:09:53 +00:00
TODO Pass2 complete 1998-09-02 19:09:53 +00:00

README 

                Announcing the Availability of the
                        Coda Distributed
                           Filesystem
                              for
                         BSD Unix Systems

        Coda is a distributed file system like NFS and AFS.  It is
freely available, like NFS.  But it functions much like AFS in being a
"stateful" file system.  Coda and AFS cache files on your local
machine to improve performance.  But Coda goes a step further than AFS
by letting you access the cached files when there is no available
network, viz. disconnected laptops and network outages.  In Coda, both
the client and server are outside the kernel which makes them easier
to experiment with.

To get more information on Coda, I would like to refer people to
        http://www.coda.cs.cmu.edu
There is a wealth of documents, papers, and theses there.  There is
also a good introduction to the Coda File System in
        http://www.coda.cs.cmu.edu/ljpaper/lj.html

Coda was originally developed as an academic prototype/testbed.  It is
being polished and rewritten where necessary.  Coda is a work in
progress and does have bugs.  It is, though, very usable.  Our
interest is in making Coda available to as many people as possible and
to have Coda evolve and flourish.

The bulk of the Coda file system code supports the Coda client
program, the Coda server program and the utilities needed by both.
All these programs are unix programs and can run equally well on any
Unix platform.  Our main development thrust is improving these
programs.  There is a small part of Coda that deals with the kernel to
file system interface.  This code is OS specific (but should not be
platform specific).

Coda is currently available for several OS's and platforms:
        Freebsd-2.2.5: i386
        Freebsd-2.2.6: i386
	Freebsd -current: i386
        linux 2.0: i386 & sparc
        linux 2.1: i386 & sparc
        NetBSD 1.3: i386
	NetBSD -current: i386
The relevant sources, binaries, and docs can be found in
        ftp://ftp.coda.cs.cmu.edu/pub/coda/

We intend to come out with new Coda releases often, not daily.  We
don't want to slight any OS/platform not mentioned above.  We are just
limited in our resources as to what we can support internally.  We
will be happy to integrate OpenBSD support as well as other OS
support.  Also, adding platform support should be relatively easy and
we can discuss this.  The only difficulty is that Coda has a light weight
process package.  It does some manipulations in assembler which would
have to be redone for a different platform.

There are several mailing lists @coda.cs.cmu.edu that discuss coda:
coda-announce and linux-coda.  We are going to revise linux-coda to be
OS neutral, since it is mainly Coda we want to discuss.  We appreciate
comments, feedback, bug reports, bug fixes, enhancements, etc.