s/substract/subtract/ in comments and error message.
s/obtainted/obtained/ in one comment.

Add a comment describing why we give carte blanche to processes
marked as PK_32. NFC.

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

- In sendsig() and sigaction1(), don't hard-code signal trampoline
versions. Instead, use the version constants from <sys/signal.h>
and automatically (and correctly) handle cases where multiple

- In sendsig() and sigaction1(), don't hard-code signal trampoline
versions. Instead, use the version constants from <sys/signal.h>
and automatically (and correctly) handle cases where multiple versions
of a particular trampoline flavor exist. Conditionalize support
for sigcontext trampolines on __HAVE_STRUCT_SIGCONTEXT.
- aarch64 and amd64 don't use sigcontext natively, but do need to
support it for 32-bit compatibility; define __HAVE_STRUCT_SIGCONTEXT
conditionally on _KERNEL.

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Since trampoline ABI ver0 is also used in other emulation environments (e.g. linux emulation),
checking (emul->e_sigobject != NULL) to determine if it is allowed or not.

Move proc_lock into the data segment. It was dynamically allocated because
at the time we had mutex_obj_alloc() but not __cacheline_aligned.

Convert the sendsig_sigcontext_16 function pointer to use the new
compat_hook mechanism.

XXX Despite being a kernel<-->module abi change, this should be
XXX pulled up to -9

If we need to handle old-version signals, load the version-specific
"compat_16" module. There is no longer a monolithic "compat" module!

XXX pullup-9 needed

Introduce sigaction_copy(), to copy sigaction structures without padding,
and use it in sigaction1(). This is to fix info leaks all at once in the
signal functions.

Fix kernel info leak, 4 bytes of padding in struct _ksiginfo. Maybe we
should just set _pad to zero on LP64?

+ Possible info leak: [len=40, leaked=4]
| #0 0xffffffff80baf397 in kleak_copyout
| #1

Fix kernel info leak, 4 bytes of padding in struct _ksiginfo. Maybe we
should just set _pad to zero on LP64?

+ Possible info leak: [len=40, leaked=4]
| #0 0xffffffff80baf397 in kleak_copyout
| #1 0xffffffff80bda817 in sigtimedwait1
| #2 0xffffffff80bdab95 in sys_____sigtimedwait50
| #3 0xffffffff80259c42 in syscall

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Realtime signal support from GSoC 2016, Charles Cui.

Change SDT (Statically Defined Tracing) probes to use link sets so that it
is easier to add probes. (From FreeBSD)

Make kill1 public (we'll need it from compat/netbsd32)

src is too big these days to tolerate superfluous apostrophes. It's
"its", people!

Don't check trampolines for SIG_DFL or SIG_IGN since they are not used.
From gimpy.

Properly differentiate between infinite timeout and zero timeout.
Local variable timo = -1 is used for zero timeout (non blocking mode).

Fixes PR 47625 from anthony.mallet

In the timeout passed to sigtimedwait, NULL means an infinite timeout,
and {.tv_sec = 0, .tv_nsec=0} means do not block at all. Add a comment
saying so. The code incorrectly treats them both as an

In the timeout passed to sigtimedwait, NULL means an infinite timeout,
and {.tv_sec = 0, .tv_nsec=0} means do not block at all. Add a comment
saying so. The code incorrectly treats them both as an infinite timeout,
and that is not fixed by this commit.

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It is useless to check for sigcontext_vec and compat module loading for
PK_32 processes. The correct modules are already loaded, otherwise how
is the process running?

From Roger Pau Monne: kill(2) called for a zombie process should return 0,
according to:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/kill.html

Remove COMPAT_SA / KERN_SA. Welcome to 6.99.3!
Approved by core@.

add a copyin function for sigset so that we can use sigtimedwait1 from
emulations.

when undoing the sigsuspend setup, either take the signal and allow the
signal path to restore the mask, or restore the mask here.

If a signal did not fire, restore the original signal mask for pselect/pollts
using a signal mask. Tested by tron.

PR/43625: Mark Davies: Fix pselect(2) to honor the temporary mask. pselect(2)
(and pollts(2)) are similar to sigsuspend(2) in that they temporarily change
the process signal mask and wait for signal

PR/43625: Mark Davies: Fix pselect(2) to honor the temporary mask. pselect(2)
(and pollts(2)) are similar to sigsuspend(2) in that they temporarily change
the process signal mask and wait for signal delivery. Factor out and share the
code that does this.

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Do not restrict the siginfo a process sends to itself in any way, but
keep restrictions for foreign processes. This is needed to allow raising
of full SIGFPE siginfo from softfloat libraries for exam

Do not restrict the siginfo a process sends to itself in any way, but
keep restrictions for foreign processes. This is needed to allow raising
of full SIGFPE siginfo from softfloat libraries for example.

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