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

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Default branch: MAIN

Add semtimedop GSoC 2024 (Shivraj Jamgade)

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

Many years ago someone created a new __link_set_sysctl_funcs to hold
the list of routines that need to be called for setting up sysctl
variables.  This worked great for all code included in the kernel
itself, but didn't deal with modules that want to create their own
sysctl data.  So, we ended up with a lot of #ifdef _MODULE blocks
so modules could explicitly call their setup functions when loaded
as non-built-in modules.

So today, we complete the task that was started so many years ago.

When modules are loaded, after we've called xxx_modcmd(INIT...) we
check if the module contains its own __link_set_sysctl_funcs, and
if so we call the functions listed.  We add a struct sysctllog member
to the struct module so we can call sysctl_teardown() when the module
gets unloaded.  (The sequence of events ensures that the sysctl stuff
doesn't get created until the rest of the module's init code does any
required memory allocation.)

So, no more need to explicitly call the sysctl setup routines when
built as a loadable module.

Sync with HEAD

Replace some "panic()" calls with simple "printf() ; return error"

There's no good reason for these build-time parameters to be allowed to
panic the kernel when it is easy to simply disable the module code and
fail gracefully.

While we're at it, similarly replace panic() when malloc fails to also
fail gracefully.

update from HEAD

Sync with HEAD (as of 26th Dec)

In sysv_sem.c, defer establishment of exithook so we can initialize the
module code from module_init() rather than waiting until after calling
exec_init().  Use a RUN_ONCE routine at entry to each sys_sem* syscall
to establish the exithook, and no longer KASSERT that the hook has
been set before removing it.  (A manually loaded module can be unloaded
before any syscalls have been invoked.)

Remove the conditional calls to the various xxx_init() routines from
init_main.c - we now rely on module_init() to handle initialization.

Let each sub-component's xxx_init() routine handle its own sysctl
sub-tree initialization;  this removes another set of #ifdef ugliness.

Tested both built-in and loadable versions and verified that atf
test kernel/t_sysv passes.

Sync with HEAD

More prep:  add a xxxfini() routine to each subcomponent so we can
clean up after ourselves.  Mostly, this checks to make sure that
there are no active itmes, and then deallocates wired kernel virtual
memory.  For SYSVSEM, we also disestablish the exithook() so we
won't try to call it after destroying its memory pool!

Don't nest struct undo and change it to sem_undo_entry

sync with head.

Sync with HEAD.

Provide compatibility for pre-christos-time_t sysv sysctls.

Sync with HEAD.

Sync with HEAD.

merge christos-time_t

Update haad-dm branch to haad-dm-base2.

Sync with head.

Set kern.posix_semaphores are runtime so it can be a module.
(Picked wrong header the last time.)

Set kern.posix_semaphores are runtime so it can be a module.

Sync with HEAD.

sync with head.

sync with head.

Remove clause 3 and 4 from TNF licenses

Welcome to the time_t=long long dev_t=uint64_t branch.

sync with head.

Sync with HEAD

sync with HEAD

Sync with HEAD.

Support for dynamic changing of SysV message queues and semaphores limits.
Also fixes the alignment problem, which was here forever.  Thanks for <uwe>
for discussion and <martin> for testing.

Reviewed by: <tech-kern>, <gdt>

sync with head.

Sync with head.

Sync with head.

Add a define to reduce the source size of the various callers of semctl1()

sync with head.

sync with head

sync with head

Use the LWP cached credentials where sane.

sync with head.

merge ktrace-lwp.

Sync with HEAD. Here we go again...

Pull up following revision(s) (requested by chs in ticket #930):
	sys/sys/sem.h: revision 1.20
	sys/kern/sysv_sem.c: revision 1.57
fix the SYSV semop number of operations per request to be limited by
seminfo.semopm (which is tunable via the SEMOPM config variable)
rather than an arbitrary constant.

fix the SYSV semop number of operations per request to be limited by
seminfo.semopm (which is tunable via the SEMOPM config variable)
rather than an arbitrary constant.

compat code reorg.

sync with -current

sync with head.

Sync with HEAD.

de-__P

Sync with HEAD

g/c unneeded/obsolete extern variable definitions

Fix the sync with head I botched.

Sync with HEAD.

Revert to passing struct proc for {exit,exec}hook.

Apply the aborted ktrace-lwp changes to a specific branch.  This is just for
others to review, I'm concerned that patch fuziness may have resulted in some
errant code being generated but I'll look at that later by comparing the diff
from the base to the branch with the file I attempt to apply to it.  This will,
at the very least, put the changes in a better context for others to review
them and attempt to tinker with removing passing of 'struct lwp' through
the kernel.

Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records.  The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Add a new feature-test macro, _NETBSD_SOURCE.  If this is defined
by the application, all NetBSD interfaces are made visible, even
if some other feature-test macro (like _POSIX_C_SOURCE) is defined.
<sys/featuretest.h> defined _NETBSD_SOURCE if none of _ANSI_SOURCE,
_POSIX_C_SOURCE and _XOPEN_SOURCE is defined, so as to preserve
existing behaviour.

This has two major advantages:
+ Programs that require non-POSIX facilities but define _POSIX_C_SOURCE
  can trivially be overruled by putting -D_NETBSD_SOURCE in their CFLAGS.
+ It makes most of the #ifs simpler, in that they're all now ORs of the
  various macros, rather than having checks for (!defined(_ANSI_SOURCE) ||
  !defined(_POSIX_C_SOURCE) || !defined(_XOPEN_SOURCE)) all over the place.

I've tried not to change the semantics of the headers in any case where
_NETBSD_SOURCE wasn't defined, but there were some places where the
current semantics were clearly mad, and retaining them was harder than
correcting them.  In particular, I've mostly normalised things so that
_ANSI_SOURCE gets you the smallest set of stuff, then _POSIX_C_SOURCE,
_XOPEN_SOURCE and _NETBSD_SOURCE in that order.

Tested by building for vax, encouraged by thorpej, and uncontested in
tech-userlevel for a week.

catch up with -current on kqueue branch

Catch up to -current.
(CVS: It's not just a program. It's an adventure!)

use the exithook mechanism to clean up semaphores.

Update thorpej_scsipi to -current as of a month ago

Sync w/ netbsd-1-5-base.

Add new sysctl node "KERN_SYSVIPC_INFO" with "KERN_SYSVIPC_MSG_INFO",
"KERN_SYSVIPC_SEM_INFO" and "KERN_SYSVIPC_SHM_INFO" to return the
info and data structures for the relevent SysV IPC types.  The return
structures use fixed-size types and should be compat32 safe.  All
user-visible changes are protected with
	#if !defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE)

Make all variable declarations extern in msg.h, sem.h and shm.h and
add relevent variable declarations to sysv_*.c and remove unneeded
header files from those .c files.

Make compat14 SysV IPC conversion functions and sysctl_file() static.

Change the data pointer to "void *" in sysctl_clockrate(),
sysctl_ntptime(), sysctl_file() and sysctl_doeproc().

Declare the SysV IPC *info structures and shmsegs pointer as extern.
Add declaration for shmsegs to param.c after shminfo structure.

Overhaul of the SVID IPC facilities, primarily to use the types specified
by the Single UNIX Specification version 2, rather than the SVR2-derived
types.  While I was here, I did a namespace sweep to expose the constants
and strucutures, and structure members described by SUSv2; documentation
updates coming shortly.

Fixes kern/8158.

* u_short -> unsigned short
* Move MAX_SOPS inside _KERNEL protection; it's not portable and has a
  meaning within semop() only.
* semop(): change the `nsops' argument type from int to size_t.
* Add _XOPEN_SOURCE protection around semconfig().

Filesystem prototype changes

KERNEL -> _KERNEL

update for new syscall args description mechanism

New RCS ID's, take two.  they're more aesthecially pleasant, and use 'NetBSD'

new standard, minimally intrusive ID format

Format police.

update from trunk

sem_num is really supposed to be a ushort, from Danny Boulet (The author)

file sem.h was added on branch magnum on 1993-11-15 08:03:47 +0000

Add the System V message queue and semaphore facilities.  Implemented
by Daniel Boulet <danny@BouletFermat.ab.ca>