- There are two cases where the server can potentially block for a long
time while servicing a request: when handling a yp_all() request, which
could take a while to complete if the map being transfered is large
(e.g. 'ypcat passwd' where passwd.byname has 10,000 entries in it),
and while doing DNS lookups when in SunOS compat mode (with the -dns
flag), since some DNS lookups can take a long time to complete. While
ypserv is blocked, other clients making requests to the server will
also block. To fix this, we fork() ypall and DNS lookups into subprocesses
and let the parent ypserv process go on servicing other incoming
requests.
We place a cap on the number of simultaneous processes that ypserv can
fork (set at 20 for now) and go back to 'linear mode' if it hits the
limit (which just means it won't fork() anymore until the number of
simultaneous processes drops under 20 again). The cap does not apply
to fork()s done as a result of ypxfr calls, since we want to do our
best to insure that map transfers from master servers succeed.
To make this work, we need our own special copy of svc_run() so that
we can properly terminate child processes once the RPC dispatch
functions have run.
(I have no idea what SunOS does in this situation. The only other
possibility I can think of is async socket I/O, but that seems
like a headache and a half to implement.)
- Do the politically correct thing and use sigaction() instead of
signal() to install the SIGCHLD handler and to ignore SIGPIPEs.
- Doing a yp_all() is sometimes slow due to the way read_database() is
implemented. This is turn is due to a certain deficiency in the DB
hash method: the R_CURSOR flag doesn't work, which means that when
handed a key and asked to return the key/data pair for the _next_
key in the map, we have to reset the DB pointer to the start of the
database, step through until we find the requested key, step one
space ahead to the _next_ key, and then use that. (The original ypserv
code used GDBM has a function called gdbm_nextkey() that does
this for you.) This can get really slow for large maps. However,
when doing a ypall, it seems that all database access are sequential,
so we can forgo the first step (the 'search the database until we find
the key') since the database should remain open and the cursor
should be positioned at the right place until the yp_all() call
finishes. We can't make this assumption for arbitrary yp_first()s
and yp_next()s however (since we may have requests from several clients
for different maps all arriving at different times) so those we have
to handle the old way.
(This would be much easier if R_CURSOR really worked. Maybe I should
be using something other than the hash method.)
Fix the use of /usr/X386 to ${X11BASE}. Fix the pathname /usr/bin/chess
to /usr/games/chess.
XCircle.c:
Fix the comment after an ifdef to make it a real comment to silent gcc.
std.h:
Comment out a private definition of sys_errlist.
texinfo-3.6 distribution to enable the use of the cursor keys.
Since there is an open problem report (gnu/289) for this it might be
of interest for (some of) you.
I (Joerg) have also added a minor hack that makes info recognizing a
window size change while it has been suspended.
Submitted by: thomas@ghpc8.ihf.rwth-aachen.de (Thomas Gellekum)
constructors and destructors.
Add -lgcc_pic to LDADD for the shared library since C++ code uses stuff from
libgcc and we no longer have a shared libgcc. Should this be done by
CPLUSPLUSLIB?
platform, I discovered the following: if you use ypcat (or anything that
does a yp_all() for that matter) to dump out a map and then hit ^C before
it finishes, ypserv gets hit with a SIGPIPE and dies. (The ypall() service
is implemented using TCP.)
Fix: ignore SIGPIPEs.
bootparam_prot.x was changed for nfsv3 but bootparamd and callbootd
kept using the old version which fortunately failed at build time.
Copying hasn't been necessary since path handling was fixed in
rpcgen/rpc_main.c some time ago.
- Use one sprintf() to put together the path to the map database instead
of strcat()s and strcpy()s.
- Make the 'error opening database' Perror() statement sane.
on dlclose. Also correctly call constructors and destructors for libraries
linked with /usr/lib/c++rt0.o.
Change interpretation of dlopen manpage to call _init() rather than init()
for dlopened objects.
Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to
call destructors when an object is unloaded.
Change interface between crt0 and ld.so to allow crt0 to call a function on
exit to call destructors for shared libraries explicitly.
These changes are backwards compatible. Old binaries will work with the new
ld.so and new binaries will work with the old ld.so. A version number has
been introduced in the crt0-ld.so interface to allow for future changes.
Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
cpio/copyout.c:
Don't output a file if the major, minor or totality of its rdev would be
truncated. Print a message about the skipped files to stderr but don't
report the error in the exit status. cpio's abysmal error handling doesn't
allow continuing after an error, and the rdev checks had to be misplaced
to avoid the problem of returning an error code from routines that return
void.
pax/pax.h:
Use the system macros for major(), minor() and makedev().
pax already checks _all_ output conversions for overflow. This has the
undesirable effect that failure to convert relatively useless fields
such as st_dev for regular files causes files not to be output. pax
doesn't report exactly which fields couldn't be converted.
tar/create.c:
Don't output a file if the major or minor its rdev would be truncated.
Print a message about the skipped files to stderr and report the error
in the exit status.
tar/tar.c:
For not immediately fatal errors, exit with status 1, not the error count
(mod 256).
All:
Minor numbers are limited to 21 bits in pax's ustar format and to 18
bits in archives created by gnu tar (gnu tar wastes 3 bits for padding).
pax's and cpio's ustar format is incompatible with gnu tar's ustar
format for other reasons (see cpio/README).
now safely add a line like
ldconfig -m ${PREFIX}/lib
in ports' Makefiles and packing lists without throwing away some
directories the user may have added.
Submitted by: Mostly by Paul Kranenburg <pk@cs.few.eur.nl>
Add a NOMAN= . It doesn't have a manual page yet.
Please don't cry :-). I ask Rod first. the whole isdn subdir is not
used in the moment and is only dead source code in the tree.
In the case where ypserv is started with the -dns flag, fall through to
the DNS lookup code only if asked to match a map with the word 'host'
in its name. This prevents failed matches on non-host maps from being
incorrectly handed off to DNS.
