CVS log for src/sys/sys/siginfo.h

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sys/sys: remove CONSTCOND comment from do-while-0 loop

Lint doesn't need this comment anymore, as there is nothing surprising
or unusual about this idiom.

Mostly merge changes from HEAD upto 20200411

Pull up following revision(s) (requested by kamil in ticket #311):

	sys/sys/siginfo.h: revision 1.34
	sys/kern/sys_ptrace_common.c: revision 1.59
	sys/kern/sys_lwp.c: revision 1.70
	sys/compat/sys/siginfo.h: revision 1.8
	sys/kern/kern_sig.c: revision 1.365
	sys/kern/kern_lwp.c: revision 1.203
	sys/sys/signalvar.h: revision 1.96
	sys/kern/kern_exec.c: revision 1.482
	sys/kern/kern_fork.c: revision 1.214

Move TRAP_CHLD/TRAP_LWP ptrace information from struct proc to siginfo

Storing struct ptrace_state information inside struct proc was vulnerable
to synchronization bugs, as multiple events emitted in the same time were
overwritting other ones.

Cache the original parent process id in p_oppid. Reusing here p_opptr is
in theory prone to slight race codition.

Change the semantics of PT_GET_PROCESS_STATE, reutning EINVAL for calls
prompting for the value in cases when there wasn't registered an
appropriate event.

Add an alternative approach to check the ptrace_state information, directly
from the siginfo_t value returned from PT_GET_SIGINFO. The original
PT_GET_PROCESS_STATE approach is kept for compat with older NetBSD and
OpenBSD. New code is recommended to keep using PT_GET_PROCESS_STATE.
Add a couple of compile-time asserts for assumptions in the code.

No functional change intended in existing ptrace(2) software.

All ATF ptrace(2) and ATF GDB tests pass.

This change improves reliability of the threading ptrace(2) code.

Move TRAP_CHLD/TRAP_LWP ptrace information from struct proc to siginfo

Storing struct ptrace_state information inside struct proc was vulnerable
to synchronization bugs, as multiple events emitted in the same time were
overwritting other ones.

Cache the original parent process id in p_oppid. Reusing here p_opptr is
in theory prone to slight race codition.

Change the semantics of PT_GET_PROCESS_STATE, reutning EINVAL for calls
prompting for the value in cases when there wasn't registered an
appropriate event.

Add an alternative approach to check the ptrace_state information, directly
from the siginfo_t value returned from PT_GET_SIGINFO. The original
PT_GET_PROCESS_STATE approach is kept for compat with older NetBSD and
OpenBSD. New code is recommended to keep using PT_GET_PROCESS_STATE.

Add a couple of compile-time asserts for assumptions in the code.

No functional change intended in existing ptrace(2) software.

All ATF ptrace(2) and ATF GDB tests pass.

This change improves reliability of the threading ptrace(2) code.

Sync with HEAD

Ship with syscall information with SIGTRAP TRAP_SCE/TRAP_SCX for tracers

Expand siginfo_t (struct size not changed) to new values for
SIGTRAP TRAP_SCE/TRAP_SCX events.

 - si_sysnum  -- syscall number (int)
 - si_retval  -- return value (2 x int)
 - si_error   -- error code (int)
 - si_args    -- syscall arguments (8 x uint64_t)

TRAP_SCE delivers si_sysnum and si_args.

TRAP_SCX delivers si_sysnum, si_retval, si_error and si_args.

Users: debuggers (like GDB) and syscall tracers (like strace, truss).

This MI interface is similar to the Linux kernel proposal of
PTRACE_GET_SYSCALL_INFO by the strace developer team.

update from HEAD

Sync with HEAD

Sync with HEAD

Sync with HEAD

Add new SIGTRAP types: TRAP_SCE and TRAP_SCX

New entries:
 - TRAP_SCE        7       /* Process syscall entry trap           */
 - TRAP_SCX        8       /* Process syscall exit trap            */

Sponsored by <The NetBSD Foundation>

Commit TRAP_HWWPT -> TRAP_DBREG switch in <sys/siginfo.h>

This is integral part of the previous two commits.

Sponsored by <The NetBSD Foundation>

Sync with HEAD

Introduce TRAP_HWWPT in <sys/siginfo> for hw assisted watchpoints

TRAP_HWWPT is si_code of SIGTRAP and it will be used for hardware assisted
watchpoints (vel breakpoints).

Sponsored by <The NetBSD Foundation>

Introduce PTRACE_LWP_{CREATE,EXIT} in ptrace(2) and TRAP_LWP in siginfo(5)

Add interface in ptrace(2) to track thread (LWP) events:
 - birth,
 - termination.

The purpose of this thread is to keep track of the current thread state in
a tracee and apply e.g. per-thread designed hardware assisted watchpoints.

This interface reuses the EVENT_MASK and PROCESS_STATE interface, and
shares it with PTRACE_FORK, PTRACE_VFORK and PTRACE_VFORK_DONE.

Change the following structure:

typedef struct ptrace_state {
        int     pe_report_event;
        pid_t   pe_other_pid;
} ptrace_state_t;

to

typedef struct ptrace_state {
        int     pe_report_event;
        union {
                pid_t   _pe_other_pid;
                lwpid_t _pe_lwp;
        } _option;
} ptrace_state_t;

#define pe_other_pid    _option._pe_other_pid
#define pe_lwp          _option._pe_lwp

This keeps size of ptrace_state_t unchanged as both pid_t and lwpid_t are
defined as int32_t-like integer. This change does not break existing
prebuilt software and has minimal effect on necessity for source-code
changes. In summary, this change should be binary compatible and shouldn't
break build of existing software.


Introduce new siginfo(5) type for LWP events under the SIGTRAP signal:
TRAP_LWP. This change will help debuggers to distinguish exact source of
SIGTRAP.


Add two basic t_ptrace_wait* tests:
lwp_create1:
    Verify that 1 LWP creation is intercepted by ptrace(2) with
    EVENT_MASK set to PTRACE_LWP_CREATE

lwp_exit1:
    Verify that 1 LWP creation is intercepted by ptrace(2) with
    EVENT_MASK set to PTRACE_LWP_EXIT

All tests are passing.


Surfing the previous kernel ABI bump to 7.99.59 for PTRACE_VFORK{,_DONE}.

Sponsored by <The NetBSD Foundation>

Introduce new si_code for SIGTRAP: TRAP_CHLD - process child trap

The SIGTRAP signal is thrown from the kernel if EVENT_MASK (ptrace_event)
enables PTRACE_FORK. This new si_code helps debuggers to distinguish the
exact source of signal delivered for a debugger.

Another purpose of TRAP_CHLD is to retain the same behavior inside the
NetBSD kernel for process child traps and have an interface to monitor it.

Retrieving exact event and extended properties of process child trap is
available with PT_GET_PROCESS_STATE.

There is no behavior change for existing software.

This si_code value is NetBSD extension.

Sponsored by <The NetBSD Foundation>

Sync with HEAD.  (Note that most of these changes are simply $NetBSD$
tag issues.)

Introduce new SIGTRAP code: TRAP_EXEC

On exec() events under a debugger generate the SIGTRAP signal with
TRAP_EXEC property. This allows tracer to distinguish exec() events easily.

Sponsored by <The NetBSD Foundation>

Replace in comment SIGPOLL with SIGIO

SIGPOLL is absent in NetBSD.

No functional change.

Rebase to HEAD as of a few days ago.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

sync with head

convert vmem, signals, powerhooks from CIRCLEQ -> TAILQ.

resync from head

Systematically include sys/featuretest.h when _NETBSD_SOURCE is used.
Some are redundant, but make verification with grep much easier.

resync with head

Add two more si_trap fields (si_trap[23]) so more information can be passed
on a fault.

Sync with HEAD.

revert previous. breaks things in subtle ways (ntpdate gets stuck on boot,
shell processes get stuck on ^C)

Make lwpid part of siginfo so that it can be passed to userland.

sync with head

Remove last references to __HAVE_SIGINFO

Sync with HEAD.

Commit is split, to avoid a "too many arguments" protocol error.

sync with head.

Sync with HEAD.

Pull up following revision(s) (requested by rmind in ticket #631):
	sys/sys/siginfo.h: revision 1.18
fix typo for POLL_HUP. Noted by yamt.

namespace sanity: SI_LWP and SI_NOINFO are _NETBSD_SOURCE only

Sync with HEAD.

Sync with HEAD.

fix typo for POLL_HUP. Noted by yamt.

Sync with HEAD.

sync with head.

sync with head.

Remove clause 3 and 4 from TNF licenses

sync with head.

Sync with head.

Sync with head.

rename si_sigval -> si_value to match POSIX RTS.

sync with head.

Merge newlock2 to head.

Checkpoint work in progress.

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.

sync with head.

merge ktrace-lwp.

Sync with HEAD. Here we go again...

Remove compat32 stuff.

Fix the sync with head I botched.

Sync with HEAD.

Sync with HEAD

Pull up revision 1.12 (requested by matt in ticket #56):
Add the notion of an "empty" ksiginfo_t (one where on signo is filled
in).
Add an initializer for them: KSI_INIT_EMPTY
Add a predicate for them: KSI_EMPTY_P
Don't bother storing empty ksiginfo_t's since they have no information.
Change uses of KSI_INIT to KSI_INIT_EMPTY where no other information
other
than the signo is being filled in.

Add the notion of an "empty" ksiginfo_t (one where on signo is filled in).
Add an initializer for them: KSI_INIT_EMPTY
Add a predicate for them: KSI_EMPTY_P
Don't bother storing empty ksiginfo_t's since they have no information.
Change uses of KSI_INIT to KSI_INIT_EMPTY where no other information other
than the signo is being filled in.

PR/23997: Love: <sys/siginfo.h> pollutes userland namespace with <sys/queue.h>

Use KSI_TRAP_P in KSI_TRAPCODE.  Add some missing (..) for macro arguments.

add a macro to copy ksiginfo_t, and use it in kern_sig.c:ksiginfo_put()

change suggested by Christian Limpach

Define a few 32bit compat types (if COMPAT_NETBSD32, not exported to
userspace). Having them here is both good and bad. Good because they're
close to the actual native ones, bad because it exposes things out
of compat/netbsd32. However, putting the exclusively in the latter
requires a lot of reshuffling in the includes there, so this will
do for now.

Define SI_NOINFO to indicate that no signal specific code is available.
It is a large positive value (same as in Solaris) to distinguish a trap
for which the standard qualifiers do not fit, from a user- or other
"software"-generated signal.

Fix whitespace usage and typo in comment.

* Shuffle some data structures so, and add a flags word to ksiginfo_t.
  Right now the only flag is used to indicate if a ksiginfo_t is a
  result of a trap.  Add a predicate macro to test for this flag.
* Add initialization macros for ksiginfo_t's.
* Add accssor macro for ksi_trap.  Expands to 0 if the ksiginfo_t was
  not the result of a trap.  This matches the sigcontext trapcode semantics.
* In kpsendsig(), use KSI_TRAP_P() to select the lwp that gets the signal.
  Inspired by Matthias Drochner's fix to kpsendsig(), but correctly handles
  the case of non-trap-generated signals that have a > 0 si_code.

This patch fixes a signal delivery problem with threaded programs noted by
Matthias Drochner on tech-kern.

As discussed on tech-kern.  Reviewed and OK's by Christos.

convert to use <queue.h> and add a lock for siginfo circleq.
XXX: could use STAILQ, but there is no way to remove an element without
rescanning the queue. We should really add a special iterator that can
do this.

handle deferred signal delivery with siginfo. struct sigctx changed, so
bump to ZB.

SA_SIGINFO changes. This is 1.5Z

Sync with HEAD.

file siginfo.h was added on branch nathanw_sa on 2002-12-11 06:50:07 +0000

This is not used yet.