Commit Graph

237 Commits

Author SHA1 Message Date
David E. O'Brien
8d542cb56d Fix long standing bug that prevents the PT_CONTINUE, PT_KILL and
PT_DETACH ptrace(2) requests from functioning as advertised in the
manual page.  As described in kern/35175, the PT_DETACH request will,
under certain circumstances, pass an unwanted signal on to the traced
process upan detaching from it.  The PT_CONTINUE request will
sometimes fail if you make it pass a signal that has "properties" that
differ from the properties of the signal that origionally caused the
traced process to be stopped.  Since PT_KILL is nothing than
PT_CONTINUE with SIGKILL, it is broken too.  In the PT_KILL case, this
leads to an unkillable process.

PR:		44011
Submitted by:	Mark Kettenis <kettenis@chello.nl>
Approved by:	re(jhb)
2003-05-16 01:34:23 +00:00
John Baldwin
90af4afacb - Merge struct procsig with struct sigacts.
- Move struct sigacts out of the u-area and malloc() it using the
  M_SUBPROC malloc bucket.
- Add a small sigacts_*() API for managing sigacts structures: sigacts_alloc(),
  sigacts_free(), sigacts_copy(), sigacts_share(), and sigacts_shared().
- Remove the p_sigignore, p_sigacts, and p_sigcatch macros.
- Add a mutex to struct sigacts that protects all the members of the struct.
- Add sigacts locking.
- Remove Giant from nosys(), kill(), killpg(), and kern_sigaction() now
  that sigacts is locked.
- Several in-kernel functions such as psignal(), tdsignal(), trapsignal(),
  and thread_stopped() are now MP safe.

Reviewed by:	arch@
Approved by:	re (rwatson)
2003-05-13 20:36:02 +00:00
John Baldwin
b1bf1c3a98 Remove Giant from kern_sigsuspend() and osigsuspend() as these should now
be MP safe.

Approved by:	re (scottl)
2003-05-09 19:11:32 +00:00
John Baldwin
854dc8c2a1 Mostly sort the includes. 2003-05-05 21:26:25 +00:00
John Baldwin
18440c7fe7 Lock the proc lock around calls to tdsignal() in the sigwait() family of
syscalls.
2003-05-05 21:18:10 +00:00
John Baldwin
6711f10fb6 Make issignal() private to kern_sig.c since it is only called from cursig()
and cursig() is now a function rather than a macro.
2003-05-05 21:16:28 +00:00
John Baldwin
a14e118939 Forgot to remove Giant around call to kern_sigaction() in
freebsd4_sigaction() in revision 1.232.
2003-04-30 19:45:13 +00:00
John Baldwin
25d6dc0606 Push Giant down into kern_sigaction() instead of locking it around calls
to kern_sigaction() in the various callers of the function.
2003-04-25 20:01:19 +00:00
John Baldwin
cf60731b01 Remove Giant from osigblock(), osigsetmask(), and kern_sigaltstack(). 2003-04-23 19:49:18 +00:00
John Baldwin
5afe0c9947 - Reorganize osigstack() to do the copyin first, grab the proc lock once,
do all the various sigstack dances, unlock the proc lock, and finally do
  the copyout.  This more closely resembles the behavior of
  kern_sigaltstack() and closes a small race.
- Remove Giant from osigstack as it is no longer needed.
2003-04-23 18:50:25 +00:00
David Xu
06ce69a720 Unbreak sigaltstack syscall. sigonstack is now a function and
want proc lock be held.
2003-04-19 05:04:06 +00:00
John Baldwin
8b94a0616d - Make sigonstack() a regular function instead of an inline and add a proc
lock assertion to it.
- SIGPENDING() no longer needs sched_lock, so only grab sched_lock to set
  the TDF_NEEDSIGCHK and TDF_ASTPENDING flags in signotify().
- Add a proc lock assertion to tdsigwakeup().
- Since we always set TDF_OLDMASK while holding the proc lock, the proc
  lock is sufficient protection to check its state in postsig() and we only
  need sched_lock when clearing the actual flag.
2003-04-18 20:59:05 +00:00
John Baldwin
e77daab1af Rename do_sigprocmask() to kern_sigprocmask() and make it a global symbol
so that it can be used by binary emulators.
2003-04-18 20:18:44 +00:00
John Baldwin
9d8643eca6 Don't hold the proc lock while performing sigset conversions on local
variables.
2003-04-17 22:07:56 +00:00
John Baldwin
5edadff94d - Remove garbage SIGSETOR() that snuck into struct sigpending_args
definition.
- Use the proper constant for the last arg to kern_sigaction() in osigvec()
  instead of a magic value.
2003-04-17 22:06:43 +00:00
David Xu
f9b89f7e3e Style fix. 2003-04-12 02:54:46 +00:00
David Xu
5312b1c7fa Check SIG_HOLD action ealier to avoid missing test it in later code. 2003-04-12 00:38:47 +00:00
Jeff Roberson
c9dfa2e08b - p will be unused in cursig() if INVARIANTS is not defined. Access it
through td->td_proc to avoid the unused variable.

Spotted by:	Maxim Konovalov <maxim@macomnet.ru>
2003-04-01 09:07:36 +00:00
Jeff Roberson
a447cd8b28 - Define sigwait, sigtimedwait, and sigwaitinfo in terms of
kern_sigtimedwait() which is capable of supporting all of their semantics.
 - These should be POSIX compliant but more careful review is needed before
   we announce this.
2003-03-31 23:30:41 +00:00
Jeff Roberson
4093529dee - Move p->p_sigmask to td->td_sigmask. Signal masks will be per thread with
a follow on commit to kern_sig.c
 - signotify() now operates on a thread since unmasked pending signals are
   stored in the thread.
 - PS_NEEDSIGCHK moves to TDF_NEEDSIGCHK.
2003-03-31 22:49:17 +00:00
Jeff Roberson
da33176f39 - Mark signals which may be delivered to any thread in the process with
SA_PROC.  Signals without this flag should be directed to a particular
   thread if this is possible.
2003-03-31 22:12:09 +00:00
Jeff Roberson
1bf4700bff - Change trapsignal() to accept a thread and not a proc.
- Change all consumers to pass in a thread.

Right now this does not cause any functional changes but it will be important
later when signals can be delivered to specific threads.
2003-03-31 22:02:38 +00:00
David Xu
e574e444e0 Fix threaded process job control bug. SMP tested.
Reviewed by: julian
2003-03-11 00:07:53 +00:00
Tim J. Robbins
ef3dab76bf Hold the proc lock while accessing p_procsig in trapsignal(). 2003-03-09 01:40:55 +00:00
John Baldwin
263067951a Replace calls to WITNESS_SLEEP() and witness_list() with equivalent calls
to WITNESS_WARN().
2003-03-04 21:03:05 +00:00
Julian Elischer
ac2e415327 Change the process flags P_KSES to be P_THREADED.
This is just a cosmetic change but I've been meaning to do it for about a year.
2003-02-27 02:05:19 +00:00
David Xu
426269b2c2 Fix a bug when handling SIGCONT.
Reported By: Mike Makonnen <mtm@identd.net>
2003-02-26 12:47:46 +00:00
Jeff Roberson
58a3c27384 - Add a new function, thread_signal_add(), that is called from postsig to
add a signal to a mailbox's pending set.
 - Add a new function, thread_signal_upcall(), this causes the current thread
   to upcall so that we can deliver pending signals.

Reviewed by:	mini
2003-02-17 09:58:11 +00:00
Julian Elischer
4a338afd7a Move a bunch of flags from the KSE to the thread.
I was in two minds as to where to put them in the first case..
I should have listenned to the other mind.

Submitted by:	 parts by davidxu@
Reviewed by:	jeff@ mini@
2003-02-17 09:55:10 +00:00
Jeff Roberson
5215b1872f - Split the struct kse into struct upcall and struct kse. struct kse will
soon be visible only to schedulers.  This greatly simplifies much the
   KSE code.

Submitted by:	davidxu
2003-02-17 05:14:26 +00:00
Tim J. Robbins
4444375710 Acquire Giant around calls to kern_sigaction() in sigaction(),
freebsd4_sigaction() and osigaction() instead of around the whole
body of those functions. They now no longer hold Giant around calls
to copyin() and copyout(), and it is slightly more obvious what
Giant is protecting.
2003-02-15 09:56:09 +00:00
Tim J. Robbins
c41c566c4a osigpending() no longer needs Giant, for the same reason sigpending()
does not.
2003-02-15 09:15:30 +00:00
Tim J. Robbins
48e8f774cb All uses of p_siglist are protected by the proc lock now, so there's
no need to acquire Giant in sigpending() anymore.
2003-02-15 08:42:02 +00:00
Julian Elischer
6f8132a867 Reversion of commit by Davidxu plus fixes since applied.
I'm not convinced there is anything major wrong with the patch but
them's the rules..

I am using my "David's mentor" hat to revert this as he's
offline for a while.
2003-02-01 12:17:09 +00:00
Peter Wemm
bf2053cad6 No longer force COMPAT_FREEBSD4 to be on. 2003-01-27 23:01:03 +00:00
David Xu
0dbb100b9b Move UPCALL related data structure out of kse, introduce a new
data structure called kse_upcall to manage UPCALL. All KSE binding
and loaning code are gone.

A thread owns an upcall can collect all completed syscall contexts in
its ksegrp, turn itself into UPCALL mode, and takes those contexts back
to userland. Any thread without upcall structure has to export their
contexts and exit at user boundary.

Any thread running in user mode owns an upcall structure, when it enters
kernel, if the kse mailbox's current thread pointer is not NULL, then
when the thread is blocked in kernel, a new UPCALL thread is created and
the upcall structure is transfered to the new UPCALL thread. if the kse
mailbox's current thread pointer is NULL, then when a thread is blocked
in kernel, no UPCALL thread will be created.

Each upcall always has an owner thread. Userland can remove an upcall by
calling kse_exit, when all upcalls in ksegrp are removed, the group is
atomatically shutdown. An upcall owner thread also exits when process is
in exiting state. when an owner thread exits, the upcall it owns is also
removed.

KSE is a pure scheduler entity. it represents a virtual cpu. when a thread
is running, it always has a KSE associated with it. scheduler is free to
assign a KSE to thread according thread priority, if thread priority is changed,
KSE can be moved from one thread to another.

When a ksegrp is created, there is always N KSEs created in the group. the
N is the number of physical cpu in the current system. This makes it is
possible that even an userland UTS is single CPU safe, threads in kernel still
can execute on different cpu in parallel. Userland calls kse_create to add more
upcall structures into ksegrp to increase concurrent in userland itself, kernel
is not restricted by number of upcalls userland provides.

The code hasn't been tested under SMP by author due to lack of hardware.

Reviewed by: julian
2003-01-26 11:41:35 +00:00
David Xu
b81c4d1e8c Forgot to call setrunnable() for un-idled thread. 2003-01-07 06:04:33 +00:00
David Xu
ea5ab16eba Check signals for idled threads. 2003-01-07 05:56:38 +00:00
Julian Elischer
93a7aa79d6 Add code to ddb to allow backtracing an arbitrary thread.
(show thread {address})

Remove the IDLE kse state and replace it with a change in
the way threads sahre KSEs. Every KSE now has a thread, which is
considered its "owner" however a KSE may also be lent to other
threads in the same group to allow completion of in-kernel work.
n this case the owner remains the same and the KSE will revert to the
owner when the other work has been completed.

All creations of upcalls etc. is now done from
kse_reassign() which in turn is called from mi_switch or
thread_exit(). This means that special code can be removed from
msleep() and cv_wait().

kse_release() does not leave a KSE with no thread any more but
converts the existing thread into teh KSE's owner, and sets it up
for doing an upcall. It is just inhibitted from being scheduled until
there is some reason to do an upcall.

Remove all trace of the kse_idle queue since it is no-longer needed.
"Idle" KSEs are now on the loanable queue.
2002-12-28 01:23:07 +00:00
Poul-Henning Kamp
d321df47c3 Don't cast a pointer to (intptr_t) and then on to (int) when we cannot
be sure that (int) is large enough.  Instead cast only to (intptr_t) and
cast the switch/case values to (intptr_t) as well.
2002-12-17 19:13:03 +00:00
Peter Wemm
23eeeff7be Split 4.x and 5.x signal handling so that we can keep 4.x signal
handling clean and functional as 5.x evolves.  This allows some of the
nasty bandaids in the 5.x codepaths to be unwound.

Encapsulate 4.x signal handling under COMPAT_FREEBSD4 (there is an
anti-foot-shooting measure in place, 5.x folks need this for a while) and
finish encapsulating the older stuff under COMPAT_43.  Since the ancient
stuff is required on alpha (longjmp(3) passes a 'struct osigcontext *'
to the current sigreturn(2), instead of the 'ucontext_t *' that sigreturn
is supposed to take), add a compile time check to prevent foot shooting
there too.  Add uniform COMPAT_43 stubs for ia64/sparc64/powerpc.

Tested on: i386, alpha, ia64.  Compiled on sparc64 (a few days ago).
Approved by: re
2002-10-25 19:10:58 +00:00
Poul-Henning Kamp
8c5d013757 Fix mis-indentation.
Spotted by:	FlexeLint
2002-10-02 09:09:25 +00:00
Juli Mallett
1d9c56964d Back our kernel support for reliable signal queues.
Requested by:	rwatson, phk, and many others
2002-10-01 17:15:53 +00:00
Juli Mallett
a88b260a86 Back out code changes that snuck into the previous forced commit. 2002-10-01 00:16:17 +00:00
Juli Mallett
226e1171e1 (Forced commit, to clarify previous commit of ksiginfo/signal queue code.)
I've added a structure, kernel-private, to represent a pending or in-delivery
signal, called `ksiginfo'.  It is roughly analogous to the basic information
that is exported by the POSIX interface 'siginfo_t', but more basic.  I've
added functions to allocate these structures, and further to wrap all signal
operations using them.

Once the operations are wrapped, I've added a TailQ (see queue(3)) of these
structures to 'struct proc', and all pending signals are in that TailQ.  When
a signal is being delivered, it is dequeued from the list.  Once I finish
the spreading of ksiginfo throughout the tree, the dequeued structure will be
delivered to the process in question, whereas currently and normally, the
signal number is what is used.
2002-10-01 00:07:28 +00:00
Juli Mallett
1226f694e6 First half of implementation of ksiginfo, signal queues, and such. This
gets signals operating based on a TailQ, and is good enough to run X11,
GNOME, and do job control.  There are some intricate parts which could be
more refined to match the sigset_t versions, but those require further
evaluation of directions in which our signal system can expand and contract
to fit our needs.

After this has been in the tree for a while, I will make in kernel API
changes, most notably to trapsignal(9) and sendsig(9), to use ksiginfo
more robustly, such that we can actually pass information with our
(queued) signals to the userland.  That will also result in using a
struct ksiginfo pointer, rather than a signal number, in a lot of
kern_sig.c, to refer to an individual pending signal queue member, but
right now there is no defined behaviour for such.

CODAFS is unfinished in this regard because the logic is unclear in
some places.

Sponsored by:	New Gold Technology
Reviewed by:	bde, tjr, jake [an older version, logic similar]
2002-09-30 20:20:22 +00:00
David E. O'Brien
21b68415cd Fix style nit where conditionally compiled code was unconditionalized,
but style(9) was consulted.

Submitted by:	bde
2002-09-29 04:47:41 +00:00
Poul-Henning Kamp
37c841831f Be consistent about "static" functions: if the function is marked
static in its prototype, mark it static at the definition too.

Inspired by:    FlexeLint warning #512
2002-09-28 17:15:38 +00:00
Jonathan Mini
c76e33b681 Add kernel support needed for the KSE-aware libpthread:
- Use ucontext_t's to store KSE thread state.
	- Synthesize state for the UTS upon each upcall, rather than
	  saving and copying a trapframe.
	- Deliver signals to KSE-aware processes via upcall.
	- Rename kse mailbox structure fields to be more BSD-like.
	- Store the UTS's stack in struct proc in a stack_t.

Reviewed by:	bde, deischen, julian
Approved by:	-arch
2002-09-16 19:26:48 +00:00
Julian Elischer
4f0db5e08c Allocate KSEs and KSEGRPs separatly and remove them from the proc structure.
next step is to allow > 1 to be allocated per process. This would give
multi-processor threads. (when the rest of the infrastructure is
in place)

While doing this I noticed libkvm and sys/kern/kern_proc.c:fill_kinfo_proc
are diverging more than they should.. corrective action needed soon.
2002-09-15 23:52:25 +00:00