between creation of a file descriptor and close(2) when using kernel
assisted threads. What we do is stick descriptors in the table, but
mark them as "larval". This causes essentially everything to treat
it as a non-existent descriptor, except for fdalloc(), which sees a
filled slot so that it won't (incorrectly) allocate it again. When
a descriptor is fully constructed, the code that has constructed it
marks it as "mature" (which actually clears the "larval" flag), and
things continue to work as normal.
While here, gather all the code that gets a descriptor from the table
into a fd_getfile() function, and call it, rather than having the
same (sometimes incorrect) code copied all over the place.
- Change ktrace interface to pass in the current process, rather than
p->p_tracep, since the various ktr* function need curproc anyway.
- Add curproc as a parameter to mi_switch() since all callers had it
handy anyway.
- Add a second proc argument for inferior() since callers all had
curproc handy.
Also, miscellaneous cleanups in ktrace:
- ktrace now always uses file-based, rather than vnode-based I/O
(simplifies, increases type safety); eliminate KTRFLAG_FD & KTRFAC_FD.
Do non-blocking I/O, and yield a finite number of times when receiving
EWOULDBLOCK before giving up.
- move code duplicated between sys_fktrace and sys_ktrace into ktrace_common.
- simplify interface to ktrwrite()
timeout()/untimeout() API:
- Clients supply callout handle storage, thus eliminating problems of
resource allocation.
- Insertion and removal of callouts is constant time, important as
this facility is used quite a lot in the kernel.
The old timeout()/untimeout() API has been removed from the kernel.
Eliminate obsolete global kernel variable "struct timezone tz"
Add RTC_OFFSET option
Add global kernel variable rtc_offset, which is initialized by
RTC_OFFSET at kernel compile time.
on i386, x68k, mac68k, pc532 and arm32, RTC_OFFSET indicates how many
minutes west (east) of GMT the hardware RTC runs. Defaults to 0.
Places where tz variable was used to indicate this in the past have
been replaced with rtc_offset.
Add sysctl interface to rtc_offset.
Kill obsolete DST_* macros in sys/time.h
gettimeofday now always returns zeroed timezone if zone is requested.
settimeofday now ignores and logs attempts to set non-existant kernel
timezone.
A fair bit of this, the m68k core dump and exec goo, can probably be
made into a generic m68k hpux module, eventually.
More to be placed in hpux_machdep.c - keep your eyes peeled...
* It compiles (and links).
* Make use of "/emul/hpux" where applicable.
* Untangle a bit, pulling some funtions from the monolithic
hpux_compat.c into hpux_file.c, hpux_exec.c, etc.
* Fix a couple of bugs.
Yet to do:
* Move hp300-specific functions into hp300/hp300/hpux_machdep.c.
* Make everything work properly (you laugh...)
These changes are sufficient to run some simple HP-UX 9.x executables,
including ls(1) (which will read password and group information from the
YP server correctly, albeit slowly), a simple "hello world", uname(1),
and a few other odds and ends. Dynamically linked executables work, and
demand-paging _seems_ to work properly. Major problems:
* socket and/or signal handling appears to need some work yet.
* 99% sure I didn't do exactly the right thing adjusting for the
fact that "kstack" is gone now.
* ktrace(1)'ing some executables (HP-UX telnet(1) is what I tried)
causes the HP-UX executable to dump core with a SIGSEGV for an
as of yet unknown reason.
This is mostly meant as a checkpoint/snapshot, to make it easier for others
to track progress on this code, and hack on it themselves. It's certainly
better off now than before.
lukem