data after the cmsghdr when accessing internalized SCM_RIGHTS messages
(i.e. array of struct file *s). The historic interface does not align
the externalized SCM_RIGHTS messages (i.e. array of ints).
date: 1998/08/01 01:47:24; author: thorpej; state: Exp; lines: +18 -8
Don't call the protocol drain routines if how == M_NOWAIT, which typically
means we're in interrupt context. Since we can be called from a network
hardware interrupt, we could corrupt the protocol queues we try to drain
them at that time.
The problem has been addressed by letting the drain'able protocols use
a locking scheme to prevent queue corruption.
Initialize pool hash table with PR_HASHTABSIZE (i.e., 8) LIST_INIT()s
instead of one memset().
Only check for page != ph->ph_page if PR_PHINPAGE is set (in pool_chk()).
Print pool base pointer when reporting page inconsistency in pool_chk().
set SS_MORETOCOME as a hint to the lower layer that more data is coming
on the next iteration of the loop. Clear the flag after the PRU_SEND
call.
Suggested by Justin Walker <justin@apple.com> on the freebsd-net
mailing list.
There are two reasons for this:
* We should be able to pass file descriptors without sending any data.
* We could send zero-length iovecs anyway (but we shouldn't have to do this).
Also, msg_iovlen is already a u_int, so delete a bunch of casts.
by Ken Hornstein and myself.
Add flags to struct device, and define one as "active". Devices are
initially active from config_attach(). Their active state may be changed
via config_activate() and config_deactivate().
These new functions assume that the device being manipulated will recursively
perform the action on its children.
Together, config_deactivate() and config_detach() may be used to implement
interrupt-driven device detachment. config_deactivate() will take care of
things that need to be performed at interrupt time, and config_detach()
(which must run in a valid thread context) finishes the job, which may
block.
kthread_create(). Implement kthread_exit() (causes a thrad to exit).
Set P_NOCLDWAIT on kernel threads, which will cause any of their children
to be reparented to init(8) (which is already prepared to wait out orphaned
processes).
in the future):
- New function, fork_kthread(), takes entry point, argument for entry point,
and comment for new proc. May be called by any context, will fork the
thread from proc0 (requires slight changes to cpu_fork()).
- cpu_set_kpc() now takes a third argument, a void *arg to pass to the
thread entry point. Thread entry point now takes void * instead of
struct proc *.
- Create the pagedaemon and reaper kernel threads using fork_kthread().
DDB_ONPANIC. Lets user ignore breaks but enter DDB on panic. Intended
for machines where debug on panic is useful, but DDB entry is not,
(public-access console, or terminal-servers which send spurious breaks)
Add new ddb hook, console_debugger(), which decides whether or not to
ignore console ddb requests. Console drivers should be updated to call
console_debugger(), not Debugger(), in response to serial-console
break or ddb keyboard sequence.
* Change the usage of B_DONE so that it is only set when a buffer is in sync
with the data on disk.
* If a buffer is being waited for, don't put it on the age queue.
* Make sure to clear B_DONE when pages are stolen from a buffer.
* Make sure to clear B_CACHE after each use.
* If we find a buffer for the block we want with valid data, but it is too
small, panic. (This isn't supposed to happen.)
Fixes potential file corruption problems with clustering.
sommerfe