we no longer need to guard against access from hardware interrupt handlers.
Additionally, if cloning a process with CLONE_SIGHAND, arrange to have the
child process share the parent's lock so that signal state may be kept in
sync. Partially addresses PR kern/37437.
proclist_mutex and proclist_lock into a single adaptive mutex (proc_lock).
Implications:
- Inspecting process state requires thread context, so signals can no longer
be sent from a hardware interrupt handler. Signal activity must be
deferred to a soft interrupt or kthread.
- As the proc state locking is simplified, it's now safe to take exit()
and wait() out from under kernel_lock.
- The system spends less time at IPL_SCHED, and there is less lock activity.
- Socket layer becomes MP safe.
- Unix protocols become MP safe.
- Allows protocol processing interrupts to safely block on locks.
- Fixes a number of race conditions.
With much feedback from matt@ and plunky@.
but only the processes that emulate threads (with LINUX_CLONE_THREAD
set).
This fix a problem for child processes that share address space with
the parent. At exit, the child will die silently, leaving the parent
waiting indefinitely for its end ...
Make the FreeBSD and Linux compat code convert the parameters to their
native representation and call the native routines.
Remove KAUTH_PROCESS_SCHEDULER_GET/SET.
Update documentation and examples.
XXX: For now, only the Linux compat code does the priority conversion
XXX: right.
Linux priority conversion code from yamt@, thanks!
Okay yamt@.
words, don't pass an action and a request, and just use a single action to
indicate what is the operation in question.
This is the first step in fixing PR/37986, which calls for policy/priority
checking in the secmodel code. Right now we're lacking room for another
parameter required to make a decision, and this change makes room for such.
The 64bit linux emulation versions can't be used because the lock structure
alignment and field sizes all differ.
Since there need to be 4 different versions of the linux struct flock, and
amd64 kernel needs 3 of them compiled in, rather than replicating the same
code block twice more, move the body of the code into a few #defines
that can be expanded with the correct types in the linux[32]_sys_fcntl[64]()
functions.
Should fix problems running progams like skype running under linux32
emulation on amd64.
Unravel some of the knots that caused linux_file64.c to be compiled twice
for an amd64 kernel (once for linux and once for linux32) with different
parts being skipped each time.
- SHM_STAT take an index as input, and return the corresponding shmid.
- IPC_INFO and SHM_INFO returns the highest used index.
- SHM_INFO expected the total used pages (not bytes) in shm_tot field
of struct shm_info.
njoly