Commit Graph

99 Commits

Author SHA1 Message Date
Ruslan Ermilov
6ed0b39d28 Restore the ability to detach from a tty via SIOCSTTY and document
recent changes in a manpage.

Reviewed by:	cognet
2005-09-19 13:48:45 +00:00
Olivier Houchard
30ce1aad9c Slightly change the API for the SNPSTTY ioctl so that the userland now
provides a file descriptor instead of a dev_t.

Discussed with:	phk
MFC after: 3 days
2005-09-18 19:23:35 +00:00
Robert Watson
6a113b3de7 Merge the dev_clone and dev_clone_cred event handlers into a single
event handler, dev_clone, which accepts a credential argument.
Implementors of the event can ignore it if they're not interested,
and most do.  This avoids having multiple event handler types and
fall-back/precedence logic in devfs.

This changes the kernel API for /dev cloning, and may affect third
party packages containg cloning kernel modules.

Requested by:	phk
MFC after:	3 days
2005-08-08 19:55:32 +00:00
Poul-Henning Kamp
f4f6abcb4e Explicitly hold a reference to the cdev we have just cloned. This
closes the race where the cdev was reclaimed before it ever made it
back to devfs lookup.
2005-03-31 12:19:44 +00:00
Poul-Henning Kamp
7649bbb0b0 Disable two users of findcdev. They do the wrong thing now and will
need to be fixed.  In both cases the API should be reengineered to do
something (more) sensible.
2005-03-15 12:39:30 +00:00
Warner Losh
098ca2bda9 Start each of the license/copyright comments with /*-, minor shuffle of lines 2005-01-06 01:43:34 +00:00
Poul-Henning Kamp
1ef0fc1d09 Include fcntl.h not vnode.h.
Include uio.h instead of relying on vnode.h to do so.
Check O_NONBLOCK not IO_NDELAY.
2004-12-22 17:30:38 +00:00
Olivier Houchard
b5128f416a Walk through the snp softc list instead of abusing tp->ts_c to find the
snp attached to a tty.
This fixes the panic that happens when using snp.
2004-11-05 18:32:14 +00:00
Poul-Henning Kamp
969d098b0f Hold thread reference while we frob cdevsw. 2004-09-24 08:12:41 +00:00
Poul-Henning Kamp
672c05d49c Preparation commit for the tty cleanups that will follow in the near
future:

rename ttyopen() -> tty_open() and ttyclose() -> tty_close().

We need the ttyopen() and ttyclose() for the new generic cdevsw
functions for tty devices in order to have consistent naming.
2004-07-15 20:47:41 +00:00
Poul-Henning Kamp
3e019deaed Do a pass over all modules in the kernel and make them return EOPNOTSUPP
for unknown events.

A number of modules return EINVAL in this instance, and I have left
those alone for now and instead taught MOD_QUIESCE to accept this
as "didn't do anything".
2004-07-15 08:26:07 +00:00
Robert Watson
66ea137d89 Switch snoop device to using C99 initialization for struct linesw. 2004-07-14 05:32:55 +00:00
Poul-Henning Kamp
f3732fd15b Second half of the dev_t cleanup.
The big lines are:
	NODEV -> NULL
	NOUDEV -> NODEV
	udev_t -> dev_t
	udev2dev() -> findcdev()

Various minor adjustments including handling of userland access to kernel
space struct cdev etc.
2004-06-17 17:16:53 +00:00
Poul-Henning Kamp
89c9c53da0 Do the dreaded s/dev_t/struct cdev */
Bump __FreeBSD_version accordingly.
2004-06-16 09:47:26 +00:00
Poul-Henning Kamp
fe12f24bb0 Add missing <sys/module.h> includes 2004-05-30 20:08:47 +00:00
Poul-Henning Kamp
9397290e76 Add clone_setup() function rather than rely on lazy initialization.
Requested by:	rwatson
2004-03-11 12:58:55 +00:00
Bruce Evans
63a97efcbb Don't set d_flags twice. The second setting clobbered D_NOGIANT. 2004-02-24 04:35:44 +00:00
Poul-Henning Kamp
816d62bbb9 Device megapatch 5/6:
Remove the unused second argument from udev2dev().

Convert all remaining users of makedev() to use udev2dev().  The
semantic difference is that udev2dev() will only locate a pre-existing
dev_t, it will not line makedev() create a new one.

Apart from the tiny well controlled windown in D_PSEUDO drivers,
there should no longer be any "anonymous" dev_t's in the system
now, only dev_t's created with make_dev() and make_dev_alias()
2004-02-21 21:32:15 +00:00
Poul-Henning Kamp
dc08ffec87 Device megapatch 4/6:
Introduce d_version field in struct cdevsw, this must always be
initialized to D_VERSION.

Flip sense of D_NOGIANT flag to D_NEEDGIANT, this involves removing
four D_NOGIANT flags and adding 145 D_NEEDGIANT flags.
2004-02-21 21:10:55 +00:00
Poul-Henning Kamp
b0b0334878 Device megapatch 2/6:
This commit adds a couple of functions for pseudodrivers to use for
implementing cloning in a manner we will be able to lock down (shortly).

Basically what happens is that pseudo drivers get a way to ask for
"give me the dev_t with this unit number" or alternatively "give
me a dev_t with the lowest guaranteed free unit number" (there is
unfortunately a lot of non-POLA in the exact numeric value of this
number, just live with it for now)

Managing the unit number space this way removes the need to use
rman(9) to do so in the drivers this greatly simplifies the code in
the drivers because even using rman(9) they still needed to manage
their dev_t's anyway.

I have taken the if_tun, if_tap, snp and nmdm drivers through the
mill, partly because they (ab)used makedev(), but mostly because
together they represent three different problems for device-cloning:

if_tun and snp is the plain case: just give me a device.

if_tap has two kinds of devices, with a flag for device type.

nmdm has paired devices (ala pty) can you can clone either of them.
2004-02-21 20:29:52 +00:00
Seigo Tanimura
512824f8f7 - Implement selwakeuppri() which allows raising the priority of a
thread being waken up.  The thread waken up can run at a priority as
  high as after tsleep().

- Replace selwakeup()s with selwakeuppri()s and pass appropriate
  priorities.

- Add cv_broadcastpri() which raises the priority of the broadcast
  threads.  Used by selwakeuppri() if collision occurs.

Not objected in:	-arch, -current
2003-11-09 09:17:26 +00:00
David E. O'Brien
945ff31afa Use __FBSDID().
Also some minor style cleanups.
2003-08-24 18:03:45 +00:00
Poul-Henning Kamp
7ac40f5f59 Gigacommit to improve device-driver source compatibility between
branches:

Initialize struct cdevsw using C99 sparse initializtion and remove
all initializations to default values.

This patch is automatically generated and has been tested by compiling
LINT with all the fields in struct cdevsw in reverse order on alpha,
sparc64 and i386.

Approved by:    re(scottl)
2003-03-03 12:15:54 +00:00
Dag-Erling Smørgrav
521f364b80 More low-hanging fruit: kill caddr_t in calls to wakeup(9) / [mt]sleep(9). 2003-03-02 16:54:40 +00:00
Poul-Henning Kamp
e4d0d8c84a msg 2003-02-26 20:53:28 +00:00
Warner Losh
a163d034fa Back out M_* changes, per decision of the TRB.
Approved by: trb
2003-02-19 05:47:46 +00:00
Alfred Perlstein
44956c9863 Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.
Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.
2003-01-21 08:56:16 +00:00
Thomas Moestl
20207b60a8 Declare the snp ioctl()s to work on udev_t, since that is what they
really do and dev_t is defined differently in kernel and userland.
Return a correctly formed udev from SNPGTTY.

Reviewed by:	dd
2002-11-11 10:45:31 +00:00
Dima Dorfman
f4c5dfbb9a Treat input on the snp device as an `unsigned char'. According to the
submitter, this permits Russian (and probably other locales') characters
to be entered via watch(8).

PR:		35636
Submitted by:	Gleb Smirnoff <glebius@rinet.ru>
2002-04-10 03:51:49 +00:00
Alfred Perlstein
e51a25f850 Remove __P. 2002-03-20 02:08:01 +00:00
Alfred Perlstein
85f190e4d1 Fixes to make select/poll mpsafe.
Problem:
  selwakeup required calling pfind which would cause lock order
  reversals with the allproc_lock and the per-process filedesc lock.
Solution:
  Instead of recording the pid of the select()'ing process into the
  selinfo structure, actually record a pointer to the thread.  To
  avoid dereferencing a bad address all the selinfo structures that
  are in use by a thread are kept in a list hung off the thread
  (protected by sellock).  When a selwakeup occurs the selinfo is
  removed from that threads list, it is also removed on the way out
  of select or poll where the thread will traverse its list removing
  all the selinfos from its own list.

Problem:
  Previously the PROC_LOCK was used to provide the mutual exclusion
  needed to ensure proper locking, this couldn't work because there
  was a single condvar used for select and poll and condvars can
  only be used with a single mutex.
Solution:
  Introduce a global mutex 'sellock' which is used to provide mutual
  exclusion when recording events to wait on as well as performing
  notification when an event occurs.

Interesting note:
  schedlock is required to manipulate the per-thread TDF_SELECT
  flag, however if given its own field it would not need schedlock,
  also because TDF_SELECT is only manipulated under sellock one
  doesn't actually use schedlock for syncronization, only to protect
  against corruption.

Proc locks are no longer used in select/poll.

Portions contributed by: davidc
2002-03-14 01:32:30 +00:00
Dima Dorfman
cdd530ca19 Make the diagnostics printfs less ugly. 2002-03-11 03:48:32 +00:00
Dima Dorfman
2c1a6f2178 Check the return value of tsleep() in snpread(). This may be
important, since our sleep is interruptable (PCATCH flag).

PR:		30985
Discovered by:	Vladimir Jakovenko <vovik@lucky.net>
Submitted by:	Valentin Nechayev <netch@segfault.kiev.ua>
2001-11-24 15:59:46 +00:00
Dima Dorfman
2c9fb90995 Return EBUSY if we try to attach to a tty that is already being
snooped on.  This causes all kinds of Bad Things(tm) to happen since
closing one session will clobber state that's needed for the other
one.  This could theoretically be supported if the code was careful,
but until somebody implements that, preventing this will stop people
from unknowingly shooting themselves in the foot.
2001-11-24 15:34:18 +00:00
Dima Dorfman
2f7a385114 Create a snpbasedev variable which holds a reference to the first snp
device cloned, and assign all further devices to depend on it.  This
allows us to call dev_depends() on it at module unload time to get rid
of /dev/snp* (in the devfs case, anyway).  For this to work, we must
not destroy the device at close time.  [Idea stolen from if_tun.]

The above has the following sideaffects: (a) The snp device used by
watch(8) will remain after watch(8) exits.  This is probably how it
should have been all along, and how it was before devfs came along.
(b) Module unload doesn't panic if there are any /dev/snp* devices
which haven't been used (and thus previously destroyed).  Thus, we can
reenable the unload functionality disabled in rev. 1.65.

PR:		32012
2001-11-24 15:10:53 +00:00
Robert Watson
101823b1a1 'error' is now unused, since its only purpose was to catch the
results of suser_td().
2001-11-15 19:42:08 +00:00
Robert Watson
474f15b863 Temporarily disable unloading, as it appears to be broken (read: causes
panics)
2001-11-15 19:41:14 +00:00
Robert Watson
ca7779ceca o Rely on /dev/snp* permissions, rather than using suser() in snpopen()
to prevent inappropriate use of the snoop device.  This means that,
  with appropriate chmod'ing, arbitrary users may make use of the snoop
  device.
2001-11-15 19:28:49 +00:00
Julian Elischer
b40ce4165d KSE Milestone 2
Note ALL MODULES MUST BE RECOMPILED
make the kernel aware that there are smaller units of scheduling than the
process. (but only allow one thread per process at this time).
This is functionally equivalent to teh previousl -current except
that there is a thread associated with each process.

Sorry john! (your next MFC will be a doosie!)

Reviewed by: peter@freebsd.org, dillon@freebsd.org

X-MFC after:    ha ha ha ha
2001-09-12 08:38:13 +00:00
Dima Dorfman
e692c40ce1 Don't allocate a 512 byte buffer on the stack in snplwrite. It's
probably harmless in this case, since the latter is called on tty
input, which is usually a result of some system call, so we've got
plenty of stack left.  It's still nice to fix these things, though, in
case somebody ever decides this driver is a good example of something
(perhaps "what you probably shouldn't do").
2001-08-16 06:00:57 +00:00
Dima Dorfman
101f105db2 Move the kernel stuff out of snoop.h. It was only there because some
of the snp* functions needed to be called from tty.c, which is no
longer the case.
2001-07-25 14:47:56 +00:00
Dima Dorfman
ac60b28d35 Keep track of all "struct snoop"'s so that snp_modevent can fail with
EBUSY if there's a device still open.
2001-07-18 13:39:43 +00:00
Dima Dorfman
ddf5b79683 Add a line discipline close routine which restores some functionality
I accidently nuked in rev. 1.54.  Also rework the error handling in
snplwrite a little.
2001-06-05 05:07:53 +00:00
Dima Dorfman
f09f49f136 Style and cosmetic cleanups. This driver is now reasonably stlye(9)
compliant.  All the variable definitions and function names are
reasonably consistent, and the functions which should be static (i.e.,
all of them) are.  Other assorted fixes were made.  The majority of
the delta is indentation fixes.

Partially reviewed by:	bde
2001-06-05 05:00:17 +00:00
Dima Dorfman
7fd72392d9 Use the l_nullioctl exported from tty_conf.c rather than rolling our own. 2001-06-04 23:31:21 +00:00
Dima Dorfman
87826386e0 Remove unused includes, use *min() inline functions rather than a
home-grown macro, rewrite a confusing conditional in snpdevtotty(),
and change ibuf to 512 bytes instead of 1024 bytes in dsnwrite().

Reviewed by:	bde
2001-06-03 05:17:39 +00:00
Dima Dorfman
47eaa5f542 Convert this driver to (ab?)use line disciplines to get the input it
needs instead of relying on idiosyncratic hacks in the tty subsystem.
Also add module code since this can now be compiled as a module.

Silence by:	-hackers, -audit
2001-05-22 22:13:14 +00:00
Dima Dorfman
25c7870e5d Make this driver play ball with devfs(5).
Reviewed by:	brian
2001-04-17 20:53:11 +00:00
Poul-Henning Kamp
f83880518b Send the remains (such as I have located) of "block major numbers" to
the bit-bucket.
2001-03-26 12:41:29 +00:00
Peter Wemm
c83abe02aa Remove unused #include "snp.h" 2001-01-29 10:06:22 +00:00