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Commit Graph

13 Commits

Author SHA1 Message Date
Scott Long
e3546a7549 Use a sleep mutex instead of an sx lock for the kernel environment. This
allows greater flexibility for drivers that want to query the environment.

Reviewed by: jhb, mux
2006-07-09 21:42:58 +00:00
Alexander Leidinger
32069af652 The resource_xxx routines in subr_hints.c are called before and after the
kenv environment in kern_environment.c switches to dynamic kenv. The prior
call sets the static variable hintp to the static hints in subr_hints.c
(hintmode==0).

However, changes to the environment are not detected by the resource_xxx
lookups after the change to dynamic kernel environment, so the lookup
routines only report the old stuff of hintmode==0, even after the change to
the dynamic kenv. This causes kenv users to see a different environment than
the kernel routines.

This is a problem in the mixer.c code that looks up initial mixer volume
settings from the hints: If the hints are dynamic and not from the
device.hints file, mixer.c doesn't see them, but kenv does.

The patch from the PR (modified to comply to the style of the function)
solves this.

PR:		83686
Submitted by:	Harry Coin <harrycoin@qconline.com>
2005-07-31 10:46:55 +00:00
John Baldwin
85c36f3d25 Don't set ret_namelen and ret_resnamelen in res_find() unless both the
corresponding pointer to the buffer (ret_name and ret_resname) is non-NULL
to avoid possible NULL pointer derefs.

Reported by:	Coverity via sam
2005-03-24 21:20:25 +00:00
John-Mark Gurney
74e620476c fix spelling of match in comment...
MFC after:	3 days
2005-03-10 21:23:06 +00:00
John Baldwin
6591b31040 Add a resource_disabled() helper function that returns true (non-zero) if
a specified resource has been disabled via a non-zero 'disabled' hint and
false otherwise.
2003-07-02 16:01:38 +00:00
David E. O'Brien
677b542ea2 Use __FBSDID(). 2003-06-11 00:56:59 +00:00
Peter Wemm
6692ac6644 Cosmetic tweaks. Try and keep the style more consistent, catch some stray
whitespace and update a comment.
2002-05-01 02:51:50 +00:00
Peter Wemm
4f033348f4 Finish fixing hints. Remember the use_kenv state for the next run.
Otherwise we fall back to using the static hints the next time around.
We still have the leftover fallback code there which meant that we skipped
the use_hints checking on the second and subsequent calls.  Also, be a bit
more careful about walking off the end of the envp array.

I've extracted this from a larger diff.  I hope I didn't miss anything...
2002-04-27 22:32:57 +00:00
Peter Wemm
fc1218bb71 Partial fix for hints
Obtained from:  mux
2002-04-27 22:25:13 +00:00
Maxime Henrion
d786139c76 Rework the kernel environment subsystem. We now convert the static
environment needed at boot time to a dynamic subsystem when VM is
up.  The dynamic kernel environment is protected by an sx lock.

This adds some new functions to manipulate the kernel environment :
freeenv(), setenv(), unsetenv() and testenv().  freeenv() has to be
called after every getenv() when you have finished using the string.
testenv() only tests if an environment variable is present, and
doesn't require a freeenv() call. setenv() and unsetenv() are self
explanatory.

The kenv(2) syscall exports these new functionalities to userland,
mainly for kenv(1).

Reviewed by:	peter
2002-04-17 13:06:36 +00:00
Peter Wemm
d2718e479a Fix a fatal type mismatch (char *static_env; vs char static_env[]).
Submitted by:	bde
2001-09-17 21:27:41 +00:00
Peter Wemm
9516fbd6d9 Go back to having either static OR dynamic hints, with fallback
support.  Trying to fix the merged set where dynamic overrode
static was getting more and more complicated by the day.

This should fix the duplicate atkbd, psm, fd* etc in GENERIC.  (which
paniced the alpha, but not the i386)
2001-07-14 00:23:10 +00:00
Peter Wemm
2398f0cd1d Hints overhaul:
- Replace some very poorly thought out API hacks that should have been
  fixed a long while ago.
- Provide some much more flexible search functions (resource_find_*())
- Use strings for storage instead of an outgrowth of the rather
  inconvenient temporary ioconf table from config().  We already had a
  fallback to using strings before malloc/vm was running anyway.
2001-06-12 09:40:04 +00:00