CVS log for src/sys/compat/common/kern_sig_43.c

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Request diff between arbitrary revisions

Keyword substitution: kv
Default branch: MAIN

Pull up following revision(s) (requested by riastradh in ticket #1836):

	sys/compat/linux/arch/i386/linux_machdep.c: revision 1.168
	sys/compat/sunos/sunos_misc.c: revision 1.177
	sys/compat/netbsd32/netbsd32_compat_50.c: revision 1.52
	sys/compat/common/kern_resource_43.c: revision 1.23
	sys/compat/netbsd32/netbsd32_conv.h: revision 1.46
	sys/compat/linux/arch/i386/linux_ptrace.c: revision 1.35
	sys/compat/common/vfs_syscalls_12.c: revision 1.38
	sys/compat/ultrix/ultrix_misc.c: revision 1.126
	sys/compat/common/kern_sig_43.c: revision 1.37
	sys/compat/linux/common/linux_mtio.c: revision 1.8
	sys/compat/freebsd/freebsd_misc.c: revision 1.34
	sys/compat/linux/common/linux_olduname.c: revision 1.67
	sys/compat/linux/arch/mips/linux_machdep.c: revision 1.44
	sys/compat/freebsd/freebsd_sched.c: revision 1.23
	sys/compat/ossaudio/ossaudio.c: revision 1.84
	sys/compat/sys/time_types.h: revision 1.6
	sys/compat/linux/arch/powerpc/linux_machdep.c: revision 1.51
	sys/compat/linux/common/linux_file.c: revision 1.119
	sys/compat/linux/arch/arm/linux_machdep.c: revision 1.34
	sys/compat/netbsd32/netbsd32_wait.c: revision 1.25
	sys/compat/linux32/common/linux32_time.c: revision 1.38
	sys/compat/linux/arch/powerpc/linux_ptrace.c: revision 1.33
	sys/compat/linux/arch/alpha/linux_machdep.c: revision 1.52
	sys/compat/linux32/arch/amd64/linux32_machdep.c: revision 1.46
	sys/compat/netbsd32/netbsd32_compat_12.c: revision 1.36
	sys/compat/ultrix/ultrix_ioctl.c: revision 1.39
	sys/compat/linux/common/linux_misc.c: revision 1.252
	sys/compat/linux/common/linux_hdio.c: revision 1.19
	sys/compat/sunos/sunos_ioctl.c: revision 1.71
	sys/compat/linux/common/linux_sched.c: revision 1.79
	sys/compat/common/kern_info_43.c: revision 1.40
	sys/compat/linux32/common/linux32_exec_elf32.c: revision 1.20
	sys/compat/linux/common/linux_socket.c: revision 1.153
	sys/compat/linux/arch/amd64/linux_machdep.c: revision 1.60
	sys/compat/common/vfs_syscalls_43.c: revision 1.68
	sys/compat/linux/arch/powerpc/linux_exec_powerpc.c: revision 1.25
	sys/compat/netbsd32/netbsd32_ptrace.c: revision 1.9
	sys/compat/common/kern_time_50.c: revision 1.37
	sys/compat/netbsd32/netbsd32_compat_20.c: revision 1.42
	sys/compat/linux/common/linux_cdrom.c: revision 1.28
	sys/compat/linux/arch/m68k/linux_machdep.c: revision 1.43
	sys/compat/common/kern_info_09.c: revision 1.22
	sys/compat/linux32/common/linux32_resource.c: revision 1.12
	sys/compat/linux/common/linux_oldolduname.c: revision 1.67
	sys/compat/netbsd32/netbsd32_nfssvc.c: revision 1.8
	sys/compat/linux32/common/linux32_signal.c: revision 1.21
	sys/compat/common/kern_sig_13.c: revision 1.22
	sys/compat/sunos32/sunos32_ioctl.c: revision 1.36
	sys/compat/netbsd32/netbsd32_compat_43.c: revision 1.62
	sys/compat/linux/arch/arm/linux_ptrace.c: revision 1.23
	sys/compat/netbsd32/netbsd32_time.c: revision 1.56
	sys/compat/linux/common/linux_signal.c: revision 1.84
	sys/compat/netbsd32/netbsd32_signal.c: revision 1.52
	sys/compat/sunos32/sunos32_misc.c: revision 1.85
	sys/compat/linux/common/linux_time.c: revision 1.40
	sys/compat/linux/common/linux_fdio.c: revision 1.14
	sys/compat/common/vfs_syscalls_30.c: revision 1.43

sys/compat: Memset zero before copyout.

Just in case of uninitialized padding which would lead to kernel
stack disclosure.  If the compiler can prove the memset redundant
then it can optimize it away; otherwise better safe than sorry.

Pull up following revision(s), all via patch
(requested by riastradh in ticket #1487):

	sys/compat/linux/arch/i386/linux_machdep.c: revision 1.168
	sys/compat/sunos/sunos_misc.c: revision 1.177
	sys/compat/netbsd32/netbsd32_compat_50.c: revision 1.52
	sys/compat/common/kern_resource_43.c: revision 1.23
	sys/compat/netbsd32/netbsd32_conv.h: revision 1.46
	sys/compat/linux/arch/i386/linux_ptrace.c: revision 1.35
	sys/compat/common/vfs_syscalls_12.c: revision 1.38
	sys/compat/ultrix/ultrix_misc.c: revision 1.126
	sys/compat/common/kern_sig_43.c: revision 1.37
	sys/compat/linux/common/linux_mtio.c: revision 1.8
	sys/compat/freebsd/freebsd_misc.c: revision 1.34
	sys/compat/freebsd/freebsd_machdep.c: revision 1.5
	sys/compat/linux/common/linux_olduname.c: revision 1.67
	sys/compat/linux/arch/mips/linux_machdep.c: revision 1.44
	sys/compat/freebsd/freebsd_sched.c: revision 1.23
	sys/compat/ossaudio/ossaudio.c: revision 1.84
	sys/compat/sys/time_types.h: revision 1.6
	sys/compat/linux/arch/powerpc/linux_machdep.c: revision 1.51
	sys/compat/common/ieee80211_20.c: revision 1.7
	sys/compat/linux/common/linux_file.c: revision 1.119
	sys/compat/linux/arch/arm/linux_machdep.c: revision 1.34
	sys/compat/netbsd32/netbsd32_wait.c: revision 1.25
	sys/compat/linux32/common/linux32_time.c: revision 1.38
	sys/compat/linux/arch/powerpc/linux_ptrace.c: revision 1.33
	sys/compat/linux/arch/alpha/linux_machdep.c: revision 1.52
	sys/compat/linux32/arch/amd64/linux32_machdep.c: revision 1.46
	sys/compat/netbsd32/netbsd32_compat_12.c: revision 1.36
	sys/compat/ultrix/ultrix_ioctl.c: revision 1.39
	sys/compat/linux/common/linux_misc.c: revision 1.252
	sys/compat/linux/common/linux_hdio.c: revision 1.19
	sys/compat/sunos/sunos_ioctl.c: revision 1.71
	sys/compat/linux/common/linux_sched.c: revision 1.79
	sys/compat/common/kern_info_43.c: revision 1.40
	sys/compat/linux32/common/linux32_exec_elf32.c: revision 1.20
	sys/compat/linux/common/linux_socket.c: revision 1.153
	sys/compat/linux/arch/amd64/linux_machdep.c: revision 1.60
	sys/compat/common/vfs_syscalls_43.c: revision 1.68
	sys/compat/linux/arch/powerpc/linux_exec_powerpc.c: revision 1.25
	sys/compat/netbsd32/netbsd32_ptrace.c: revision 1.9
	sys/compat/common/kern_time_50.c: revision 1.37
	sys/compat/netbsd32/netbsd32_compat_20.c: revision 1.42
	sys/compat/linux/common/linux_cdrom.c: revision 1.28
	sys/compat/linux/arch/m68k/linux_machdep.c: revision 1.43
	sys/compat/common/kern_info_09.c: revision 1.22
	sys/compat/linux32/common/linux32_resource.c: revision 1.12
	sys/compat/linux/common/linux_oldolduname.c: revision 1.67
	sys/compat/common/if_media_80.c: revision 1.4
	sys/compat/linux/arch/alpha/linux_osf1.c: revision 1.5
	sys/compat/netbsd32/netbsd32_nfssvc.c: revision 1.8
	sys/compat/linux32/common/linux32_signal.c: revision 1.21
	sys/compat/common/kern_sig_13.c: revision 1.22
	sys/compat/sunos32/sunos32_ioctl.c: revision 1.36
	sys/compat/netbsd32/netbsd32_compat_43.c: revision 1.62
	sys/compat/linux/arch/arm/linux_ptrace.c: revision 1.23
	sys/compat/netbsd32/netbsd32_time.c: revision 1.56
	sys/compat/linux/common/linux_signal.c: revision 1.84
	sys/compat/netbsd32/netbsd32_signal.c: revision 1.52
	sys/compat/sunos32/sunos32_misc.c: revision 1.85
	sys/compat/linux/common/linux_time.c: revision 1.40
	sys/compat/linux/common/linux_fdio.c: revision 1.14
	sys/compat/common/vfs_syscalls_30.c: revision 1.43

sys/compat: Memset zero before copyout.

Just in case of uninitialized padding which would lead to kernel
stack disclosure.  If the compiler can prove the memset redundant
then it can optimize it away; otherwise better safe than sorry.

Use "stack_t" instead of "struct sigaltstack", as the former is the
newer standardized name.  NFC.

sys/compat: Memset zero before copyout.

Just in case of uninitialized padding which would lead to kernel
stack disclosure.  If the compiler can prove the memset redundant
then it can optimize it away; otherwise better safe than sorry.

Merge changes from current as of 20200406

Pull up the following, requested by christos in ticket #1720:

	sys/compat/common/kern_sig_43.c				1.36
	sys/compat/linux/arch/amd64/linux_machdep.c		1.59
	sys/compat/linux/common/linux_fcntl.h			1.18
	sys/compat/linux/common/linux_file64.c			1.62
	sys/compat/linux/common/linux_ipc.c			1.57
	sys/compat/linux/common/linux_misc.c			1.243
	sys/compat/linux/common/linux_signal.c			1.81
	sys/compat/linux/common/linux_socket.c			1.149 (patch)
	sys/compat/linux/common/linux_socket.h			1.24
	sys/compat/linux/common/linux_statfs.h			1.7
	sys/compat/linux/common/linux_termios.c			1.38
	sys/compat/linux/common/linux_termios.h			1.22
	sys/compat/linux32/common/linux32_dirent.c		1.20
	sys/compat/linux32/common/linux32_ioctl.c		1.14
	sys/compat/linux32/common/linux32_misc.c		1.27
	sys/compat/linux32/common/linux32_signal.c		1.20
	sys/compat/linux32/common/linux32_sysinfo.c		1.8
	sys/compat/linux32/common/linux32_termios.c		1.15
	sys/compat/linux32/common/linux32_utsname.c		1.10
	sys/compat/netbsd32/netbsd32_compat_20.c		1.39
	sys/compat/netbsd32/netbsd32_compat_43.c		1.59
	sys/compat/netbsd32/netbsd32_compat_50.c		1.44
	sys/compat/ossaudio/ossaudio.c				1.75
	sys/kern/sysv_shm.c					1.138
	sys/miscfs/procfs/procfs_linux.c			1.75 (patch)
	sys/sys/shm.h						1.54 (patch)

Fix various info leaks, out of bound access, usage of uninitialized
values and direct access to userland variables from kernel space
and memory leaks in system calls implemented for the compatibility
subsystems.

Pull up the following, requested by christos in ticket #1720:

	sys/compat/common/kern_sig_43.c				1.36
	sys/compat/linux/arch/amd64/linux_machdep.c		1.59
	sys/compat/linux/common/linux_fcntl.h			1.18
	sys/compat/linux/common/linux_file64.c			1.62
	sys/compat/linux/common/linux_ipc.c			1.57
	sys/compat/linux/common/linux_misc.c			1.243
	sys/compat/linux/common/linux_signal.c			1.81
	sys/compat/linux/common/linux_socket.c			1.149 (patch)
	sys/compat/linux/common/linux_socket.h			1.24
	sys/compat/linux/common/linux_statfs.h			1.7
	sys/compat/linux/common/linux_termios.c			1.38
	sys/compat/linux/common/linux_termios.h			1.22
	sys/compat/linux32/common/linux32_dirent.c		1.20
	sys/compat/linux32/common/linux32_ioctl.c		1.14
	sys/compat/linux32/common/linux32_misc.c		1.27
	sys/compat/linux32/common/linux32_signal.c		1.20
	sys/compat/linux32/common/linux32_sysinfo.c		1.8
	sys/compat/linux32/common/linux32_termios.c		1.15
	sys/compat/linux32/common/linux32_utsname.c		1.10
	sys/compat/netbsd32/netbsd32_compat_20.c		1.39
	sys/compat/netbsd32/netbsd32_compat_43.c		1.59
	sys/compat/netbsd32/netbsd32_compat_50.c		1.44
	sys/compat/ossaudio/ossaudio.c				1.75
	sys/kern/sysv_shm.c					1.138
	sys/miscfs/procfs/procfs_linux.c			1.75 (patch)
	sys/sys/shm.h						1.54 (patch)

Fix various info leaks, out of bound access, usage of uninitialized
values and direct access to userland variables from kernel space
and memory leaks in system calls implemented for the compatibility
subsystems.

Pull up the following, requested by christos in ticket #1487:

	sys/compat/common/kern_sig_43.c				1.36
	sys/compat/linux/arch/amd64/linux_machdep.c		1.59
	sys/compat/linux/common/linux_fcntl.h			1.18
	sys/compat/linux/common/linux_file64.c			1.62
	sys/compat/linux/common/linux_ipc.c			1.57
	sys/compat/linux/common/linux_misc.c			1.243
	sys/compat/linux/common/linux_signal.c			1.81
	sys/compat/linux/common/linux_socket.c			1.149
	sys/compat/linux/common/linux_socket.h			1.24
	sys/compat/linux/common/linux_statfs.h			1.7
	sys/compat/linux/common/linux_termios.c			1.38
	sys/compat/linux/common/linux_termios.h			1.22
	sys/compat/linux32/common/linux32_dirent.c		1.20
	sys/compat/linux32/common/linux32_ioctl.c		1.14
	sys/compat/linux32/common/linux32_misc.c		1.27
	sys/compat/linux32/common/linux32_signal.c		1.20
	sys/compat/linux32/common/linux32_sysinfo.c		1.8
	sys/compat/linux32/common/linux32_termios.c		1.15
	sys/compat/linux32/common/linux32_utsname.c		1.10
	sys/compat/netbsd32/netbsd32_compat_20.c		1.39
	sys/compat/netbsd32/netbsd32_compat_43.c		1.59
	sys/compat/netbsd32/netbsd32_compat_50.c		1.44
	sys/compat/ossaudio/ossaudio.c				1.75
	sys/kern/sysv_shm.c					1.138
	sys/miscfs/procfs/procfs_linux.c			1.75 (patch)
	sys/sys/shm.h						1.54

Fix various info leaks, out of bound access, usage of uninitialized
values and direct access to userland variables from kernel space
and memory leaks in system calls implemented for the compatibility
subsystems.

Pull up following revision(s) (requested by maxv in ticket #597):

	sys/compat/common/kern_sig_43.c: revision 1.36
	sys/compat/netbsd32/netbsd32_compat_20.c: revision 1.39
	sys/compat/netbsd32/netbsd32_compat_43.c: revision 1.59
	sys/compat/netbsd32/netbsd32_compat_50.c: revision 1.44

Fix sizeof mismatch in copyin. This leads to a user-triggerable stack
overflow. On my test build at least, by luck, the compiler orders the
variables in a way that the overflow hits only local structures which
haven't yet been initialized and used, so the overflow is harmless.

Very easily seeable with kASan - just invoke the syscall from a 32bit
binary.

Fix three stack info leaks, found by kMSan when just invoking all syscalls
with a zero page as argument.

MSan: Uninitialized Stack Memory In copyout() At Offset 0, Variable 'sb32' From compat_20_netbsd32_getfsstat()
MSan: Uninitialized Stack Memory In copyout() At Offset 12, Variable 'oss' From compat_43_sys_sigstack()
MSan: Uninitialized Stack Memory In copyout() At Offset 0, Variable 'sb' From compat_50_netbsd32___fhstat40()

Fix three stack info leaks, found by kMSan when just invoking all syscalls
with a zero page as argument.

MSan: Uninitialized Stack Memory In copyout() At Offset 0, Variable 'sb32' From compat_20_netbsd32_getfsstat()
MSan: Uninitialized Stack Memory In copyout() At Offset 12, Variable 'oss' From compat_43_sys_sigstack()
MSan: Uninitialized Stack Memory In copyout() At Offset 0, Variable 'sb' From compat_50_netbsd32___fhstat40()

Sync with HEAD

Merge the [pgoyette-compat] branch

Finish separating the compat_09 and compat_43 stuff

First pass at compat modules for 4.3BSD, NetBSD-0.9, and NetBSD-1.0

XXX Still need to deal with the sysctl stuff and other code shared
XXX between 09 and 43

Sync with HEAD.

sync with head

Remove includes <sys/mount.h> and <sys/sched.h> added for <sys/syscallargs.h>.
Now they are handled by $sysarghdrextra in sys/kern/syscalls.conf.

sync with head

Use lwp_getpcb() in compat code, clean from struct user.

Sync with HEAD.

sync with head.

sync with head.

Per discussion with ad, remove most of the #include <sys/sa.h> lines
as they were including sa.h just for the type(s) needed for syscallargs.h.

Instead, create a new file, sys/satypes.h, which contains just the
types needed for syscallargs.h. Yes, there's only one now, but that
may change and it's probably more likely to change if it'd be difficult
to handle. :-)

Per discussion with matt at n dot o, add an include of satypes.h to
sigtypes.h. Upcall handlers are kinda signal handlers, and signalling
is the header file that's already included for syscallargs.h that
closest matches SA.

This shaves about 3000 lines off of the diff of the branch relative
to the base. That also represents about 18% of the total before this
checkin.

I think this reduction is very good thing.

Initial checkin of re-adding SA. Everything except kern_sa.c
compiles in GENERIC for i386. This is still a work-in-progress, but
this checkin covers most of the mechanical work (changing signalling
to be able to accomidate SA's process-wide signalling and re-adding
includes of sys/sa.h and savar.h). Subsequent changes will be much
more interesting.

Also, kern_sa.c has received partial cleanup. There's still more
to do, though.

Remove clause 3 and 4 from TNF licenses

Merge proc::p_mutex and proc::p_smutex into a single adaptive mutex, since
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.

sync with head

sync with HEAD

Sync with HEAD

Sync with HEAD.

Sync with head.

Convert all the system call entry points from:
    int foo(struct lwp *l, void *v, register_t *retval)
to:
    int foo(struct lwp *l, const struct foo_args *uap, register_t *retval)
Fixup compat code to not write into 'uap' and (in some cases) to actually
pass a correctly formatted 'uap' structure with the right name to the
next routine.
A few 'compat' routines that just call standard ones have been deleted.
All the 'compat' code compiles (along with the kernels required to test
build it).
98% done by automated scripts.

Sync with HEAD.

ANSIfy most of the function definitions in sys/compat (but not ndis).
All by the magic of sed ...

Sync with HEAD.

Sync with head.

sync with head

Remove all the __P

sync with HEAD

sync with head.

Sync with HEAD.

Follow the merge of pmap.c on i386 and amd64 and move
pmap_init_tmp_pgtbl into arch/x86/x86/pmap.c. Modify the ACPI wakeup
code to restore CR4 before jumping back into kernel space as the large
page option might cover that.

Sync with HEAD.

Sync with head.

machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h

sync with head.

Merge newlock2 to head.

Remove support for SA. Ok core@.

Checkpoint work in progress.

sync with head.

sync with head.

__unused removal on arguments; approved by core.

sync with head

Checkpoint work in progress on locking and per-LWP signals. Very much a
a work in progress and there is still a lot to do.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

sync with head

sync with head

Use the LWP cached credentials where sane.

sync with head.

Sync with head.

Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.

sync with head.

integrate kauth.

- Move kauth_cred_t declaration to <sys/types.h>
- Cleanup struct ucred; forward declarations that are unused.
- Don't include <sys/kauth.h> in any header, but include it in the c files
  that need it.

Approved by core.

Adapt to kernel authorization KPI.

merge ktrace-lwp.

Sync with HEAD. Here we go again...

compat code reorg.

Fix the sync with head I botched.

Sync with HEAD.

Sync with HEAD

SA_SIGINFO changes

Merge the nathanw_sa branch.

sync kqueue branch with HEAD

Catch up to -current.

catch up with -current.

No longer need to pull in lwp.h; proc.h pulls it in for us.

Add kernel support for having userland provide the signal trampoline:

* struct sigacts gets a new sigact_sigdesc structure, which has the
  sigaction and the trampoline/version.  Version 0 means "legacy kernel
  provided trampoline".  Other versions are coordinated with machine-
  dependent code in libc.
* sigaction1() grows two more arguments -- the trampoline pointer and
  the trampoline version.
* A new __sigaction_sigtramp() system call is provided to register a
  trampoline along with a signal handler.
* The handler is no longer passed to sensig() functions.  Instead,
  sendsig() looks up the handler by peeking in the sigacts for the
  process getting the signal (since it has to look in there for the
  trampoline anyway).
* Native sendsig() functions now select the appropriate trampoline and
  its arguments based on the trampoline version in the sigacts.

Changes to libc to use the new facility will be checked in later.  Kernel
version not bumped; we will ride the 1.6C bump made recently.

#include <sys/sa.h> before <sys/syscallargs.h>, to provide sa_upcall_t
now that <sys/param.h> doesn't include <sys/sa.h>.

(Behold the Power of Ed)

Sync kqueue branch with -current.

Catch up to -current.

add RCSIDs (including regeneration of files as appropriate)

Catch up to -current.

use _KERNEL_OPT.

Initial commit of scheduler activations and lightweight process support.

Sync with HEAD

make LKM safe

Update thorpej_scsipi to -current as of a month ago

remove include of <vm/vm.h>. <vm/vm.h> -> <uvm/uvm_extern.h>

Kill register declarations.

Sync w/ -current.

pullup 1.10->1.11 (christos)

Make ss_size something reasonable (not 0) so sigaltstack does not fail.
Pull me up plz!

Fix copyout() arguments.

Substantial signal handling changes:
* Increase the size of sigset_t to accomodate 128 signals -- adding new
  versions of sys_setprocmask(), sys_sigaction(), sys_sigpending() and
  sys_sigsuspend() to handle the changed arguments.
* Abstract the guts of sys_sigaltstack(), sys_setprocmask(), sys_sigaction(),
  sys_sigpending() and sys_sigsuspend() into separate functions, and call them
  from all the emulations rather than hard-coding everything.  (Avoids uses
  the stackgap crap for these system calls.)
* Add a new flag (p_checksig) to indicate that a process may have signals
  pending and userret() needs to do the full (slow) check.
* Eliminate SAS_ALTSTACK; it's exactly the inverse of SS_DISABLE.
* Correct emulation bugs with restoring SS_ONSTACK.
* Make the signal mask in the sigcontext always use the emulated mask format.
* Store signals internally in sigaction structures, rather than maintaining a
  bunch of little sigsets for each SA_* bit.
* Keep track of where we put the signal trampoline, rather than figuring it out
  in *_sendsig().
* Issue a warning when a non-emulated sigaction bit is observed.
* Add missing emulated signals, and a native SIGPWR (currently not used).
* Implement the `not reset when caught' semantics for relevant signals.

Note: Only code touched by the i386 port has been modified.  Other ports and
emulations need to be updated.

* defopt COMPAT_{09,10,11,12,13} and COMPAT_NOMID.
TODO: revisit interaction between native compat and emul compat usage.

Significantly restructure the way signal state for a process is stored.
Rather than using bitmasks to redundantly store the information kept
in the process's sigacts (because the sigacts was kept in the u-area),
hang sigacts directly off the process, and access it directly.

Simplify signal setup code tremendously by storing information in
the sigacts as an array of struct sigactions, rather than in a different
format, since userspace uses sigactions.

Make sigacts sharable by adding reference counting.

Fix compiler warnings

Changed name of sigaltstack's ss_base field to ss_sp to match XPG4.2 and
traditional usage.

Prefix names of system call implementation functions with `sys_'.

Make system calls conform to a standard prototype and bring those
prototypes into scope.

Update for signal handling changes.

Rename ss_flags bits.

- Extracted all compat routines from the kern directory and moved here.
- Created compat_util.c and compat_util.h to be used by the compatibility
  modules, so they don't duplicate the same code.
- Added prototypes to the stackgap allocation routines.