Commit Graph

378 Commits

Author SHA1 Message Date
Konstantin Belousov
cc57af357b The dev_refthread() in the tty_gettp() may fail, because Giant is taken
in the giant_trick routines after the dev_refthread increments the
si_threadcount. Remove assert, do not perform dev_relthread() for failed
dev_refthread(), and handle failure in the tty_gettp() callers (cdevsw
tty methods).

Before kern_conf.c 1.210 and 1.211, the kernel usually paniced in the
giant_trick routines dereferencing NULL cdevsw, not taking this fault.

Reported by:	Vince Hoffman <jhary unsane co uk>
Debugging help and tested by:	pho
Reviewed by:	jhb
MFC after:	1 week
2008-05-23 16:46:27 +00:00
Konstantin Belousov
ca091c56e3 Use the t_state for the TS_GONE test.
Submitted by:   jhb
MFC after:	3 days
2008-05-23 16:43:59 +00:00
Ed Schouten
8837b0dd09 Move TTY unrelated bits out of <sys/tty.h>.
For some reason, the <sys/tty.h> header file also contains routines of the
clists and console that are used inside the TTY layer. Because the clists
are not only used by the TTY layer (example: various input drivers), we'd
better move the entire clist programming interface into <sys/clist.h>. Also
remove a declaration of nonexistent variable.

The <sys/tty.h> header also contains various definitions for the console
code (tty_cons.c). Also move these to <sys/cons.h>, because they are
not implemented inside the TTY layer.

While there, create separate malloc pools for the clist and console code.

Approved by:	philip (mentor)
2008-05-23 16:06:35 +00:00
David Xu
d61f3de656 Implement POSIX function tcgetsid() which returns session id.
PR: stand/107561
2008-04-15 08:33:32 +00:00
Jeff Roberson
374ae2a393 - Relax requirements for p_numthreads, p_threads, p_swtick, and p_nice from
requiring the per-process spinlock to only requiring the process lock.
 - Reflect these changes in the proc.h documentation and consumers throughout
   the kernel.  This is a substantial reduction in locking cost for these
   fields and was made possible by recent changes to threading support.
2008-03-19 06:19:01 +00:00
John Baldwin
39033470fe Close a race in the kern.ttys sysctl handler that resulted in panics in
dev2udev() when a tty was being detached concurrently with the sysctl
handler:
- Hold the 'tty_list_mutex' lock while we read all the fields out of the
  struct tty for copying out later.  Previously the pty(4) and pts(4)
  destroy routines could set t_dev to NULL, drop their reference on the
  tty and destroy the cdev while the sysctl handler was attempting to
  invoke dev2udev() on the cdev being destroyed.  This happened when the
  sysctl handler read the value of t_dev prior to it being set to NULL
  either due to it being stale or due to timing races.  By holding the
  list lock we guarantee that the destroy routines will block in ttyrel()
  in that case and not destroy the cdev until after we've copied all of our
  data.  We may see a NULL cdev pointer or we may see the previous value,
  but the previous value will no longer point to a destroyed cdev if we
  see it.
- Fix the ttyfree() routine used by tty device drivers in their detach
  methods to use ttyrel() on the tty so we don't leak them.  Also, fix it
  to use the same order of operations as pty/pts destruction (set t_dev
  NULL, ttyrel(), destroy_dev()) so it cooperates with the sysctl handler.

MFC after:	3 days
Tested by:	avatar
2008-01-08 04:53:28 +00:00
Konstantin Belousov
e69aee3117 ttyfree() frees the cdev(). But if there are pending kevents,
filt_ttyrdetach() etc would later attempt to dereference cdev->si_tty,
causing a 0xdeadc0de dereference.  Change kn_hook value from cdev to
struct tty to avoid dereferencing freed cdev.

In ttygone(), wake up select(), sigio and kevent() users in addition
to the queue sleepers.

Return EV_EOF from kevent filters if TS_GONE is set.

Submitted by:	peter
Tested by:	Peter Holm
Approved by:	re (kensmith)
MFC after:	2 weeks
2007-07-20 09:41:54 +00:00
Jeff Roberson
03d03260b2 - Use rufetchcalc() rather than calcru() in ttyinfo so that we get
correct system and user time stats.

Approved by:	re
Reported by:	kris
Discussed with:	Attilio
2007-07-01 00:17:59 +00:00
Olivier Houchard
e411ce026a Re-acquire the PROC_SLOCK before calling calcru(), and release it after,
since calcru() expects it to be locked.

Reviewed by:	attilio
2007-06-11 21:05:41 +00:00
Matt Jacob
26756b7a58 The new compiler can't quite follow the logic of has_stime and
complains about using uninitialized tags in stime.
2007-06-10 01:49:17 +00:00
Jeff Roberson
07a61420ff Commit 9/14 of sched_lock decomposition.
- Attempt to return the ttyinfo() selection algorithm to something sane
   as it has been broken and disabled for some time.  Adapt this algorithm
   in such a way that it does not conflict with per-cpu scheduler locking.

Tested by:      kris, current@
Tested on:      i386, amd64, ULE, 4BSD, libthr, libkse, PREEMPTION, etc.
Discussed with: kris, attilio, kmacy, jhb, julian, bde (small parts each)
2007-06-04 23:55:32 +00:00
Martin Blapp
cd1b20d58a Back out rev. 1.266. The real cause for the recent panics has been fixed
in rev. 1.267 and there is no need to keep this test.
2006-12-20 02:49:59 +00:00
Martin Blapp
b472f371b2 Giant might have been temporarily dropped while waiting for proctree_lock, allowing for an
intervening tty_close() that cleared tp->t_session.

Submitted by:	tegge
MFC:		1 day
2006-12-19 22:34:32 +00:00
Martin Blapp
e0b43fcf44 Add the tp->t_refcnt validity check back. There are still some race
conditions where tp->t_refcnt can go to zero.
2006-12-19 16:46:13 +00:00
Julian Elischer
ad1e7d285a Threading cleanup.. part 2 of several.
Make part of John Birrell's KSE patch permanent..
Specifically, remove:
Any reference of the ksegrp structure. This feature was
never fully utilised and made things overly complicated.
All code in the scheduler that tried to make threaded programs
fair to unthreaded programs.  Libpthread processes will already
do this to some extent and libthr processes already disable it.

Also:
Since this makes such a big change to the scheduler(s), take the opportunity
to rename some structures and elements that had to be moved anyhow.
This makes the code a lot more readable.

The ULE scheduler compiles again but I have no idea if it works.

The 4bsd scheduler still reqires a little cleaning and some functions that now do
ALMOST nothing will go away, but I thought I'd do that as a separate commit.

Tested by David Xu, and Dan Eischen using libthr and libpthread.
2006-12-06 06:34:57 +00:00
Tor Egge
40dee3da29 Don't drop reference to tty in tty_close() if TS_ISOPEN is already cleared.
Reviewed by:	bde
2006-11-06 22:12:43 +00:00
Robert Watson
acd3428b7d Sweep kernel replacing suser(9) calls with priv(9) calls, assigning
specific privilege names to a broad range of privileges.  These may
require some future tweaking.

Sponsored by:           nCircle Network Security, Inc.
Obtained from:          TrustedBSD Project
Discussed on:           arch@
Reviewed (at least in part) by: mlaier, jmg, pjd, bde, ceri,
                        Alex Lyashkov <umka at sevcity dot net>,
                        Skip Ford <skip dot ford at verizon dot net>,
                        Antoine Brodin <antoine dot brodin at laposte dot net>
2006-11-06 13:42:10 +00:00
John Birrell
8460a577a4 Make KSE a kernel option, turned on by default in all GENERIC
kernel configs except sun4v (which doesn't process signals properly
with KSE).

Reviewed by:	davidxu@
2006-10-26 21:42:22 +00:00
Martin Blapp
35dcc318f4 Any call of tty_close() with a tty refcount of <= 1 is wrong and we will
free the tty in this case. This is a workaround until the underlaying
devfs/tty problems are fixed.

MFC after:	1 day
2006-09-30 08:11:51 +00:00
Martin Blapp
7c56049e6d Check for tp->t_refcnt == 0 before doing anything in tty_open().
PR:		103520
MFC after:	1 week
2006-09-23 14:52:46 +00:00
Martin Blapp
1c1d411bee Back out rev. 1.258. The real race cause has been fixed
in rev. 1.241 of kern_proc.c.

Requested by:	jhb
2006-09-21 14:09:26 +00:00
Martin Blapp
f976eefa00 Fix locking race in ttymodem(). The locking of the proctree happens too late
and opens a small race window before tp->t_session->s_leader is accessed. In case
tp->t_session has just been set to NULL elsewhere, we get a panic().

This fix is a bandaid until someone else fixes the whole locking in the tty subsystem.
Definitly more work needs to be done.

MFC after:	1 week
Reviewed by:	mlaier
PR:		kern/103101
2006-09-10 16:51:56 +00:00
Poul-Henning Kamp
d3e64681d6 Move the old BSD4.3 tty compatibility from (!BURN_BRIDGES && COMPAT_43)
to COMPAT_43TTY.

Add COMPAT_43TTY to NOTES and */conf/GENERIC

Compile tty_compat.c only under the new option.

Spit out
	#warning "Old BSD tty API used, please upgrade."
if ioctl_compat.h gets #included from userland.
2006-01-10 09:19:10 +00:00
Poul-Henning Kamp
d5f1e0d1ef Deorbit ttymalloc() in preference for ttyalloc() 2006-01-04 09:59:07 +00:00
Poul-Henning Kamp
246b8d448a Use MTX_SYSINIT to set up the tty list mutex. 2006-01-04 08:22:39 +00:00
John Baldwin
2851f51eb1 Revert most of revision 1.235 and fix the problem a different way. We
can't acquire an sx lock in ttyinfo() because ttyinfo() can be called
from interrupt handlers (such as atkbd_intr()).  Instead, go back to
locking the process group while we pick a thread to display information for
and hold that lock until after we drop sched_lock to make sure the
process doesn't exit out from under us.  sched_lock ensures that the
specific thread from that process doesn't go away.  To protect against
the process exiting after we drop the proc lock but before we dereference
it to lookup the pid and p_comm in the call to ttyprintf(), we now copy
the pid and p_comm to local variables while holding the proc lock.

This problem was found by the recently added TD_NO_SLEEPING assertions for
interrupt handlers.

Tested by:	emaste
MFC after:	1 week
2005-10-27 16:47:28 +00:00
Poul-Henning Kamp
5ef5ee7b62 Use new functions to call into drivers methods. 2005-10-16 21:07:31 +00:00
Poul-Henning Kamp
7423b2b40c Make ttyconsolemode() call ttsetwater() so that drivers don't have to. 2005-10-16 20:58:22 +00:00
Poul-Henning Kamp
733634738e Eliminate two unused arguments to ttycreate(). 2005-10-16 20:22:56 +00:00
Suleiman Souhlal
571dcd15e2 Fix the recent panics/LORs/hangs created by my kqueue commit by:
- Introducing the possibility of using locks different than mutexes
for the knlist locking. In order to do this, we add three arguments to
knlist_init() to specify the functions to use to lock, unlock and
check if the lock is owned. If these arguments are NULL, we assume
mtx_lock, mtx_unlock and mtx_owned, respectively.

- Using the vnode lock for the knlist locking, when doing kqueue operations
on a vnode. This way, we don't have to lock the vnode while holding a
mutex, in filt_vfsread.

Reviewed by:	jmg
Approved by:	re (scottl), scottl (mentor override)
Pointyhat to:	ssouhlal
Will be happy:	everyone
2005-07-01 16:28:32 +00:00
Tai-hwa Liang
2d4420789d According to the comment in struct tty, t_modem is optional; hence we should
guard against NULL t_modem entry. Otherwise, driver doesn't have t_modem
callback implemented(such like sys/dev/usb/ucycom.c) would panic when
someone opens the driver's associated tty device.

Reviewed by:	phk, sam (mentor)
2005-04-13 13:56:17 +00:00
Poul-Henning Kamp
4a650cc291 Make (some) serial ports implement the PPS-API again. This change
appearantly fell out during the tty code cleanup.
2005-03-26 20:12:39 +00:00
Peter Wemm
f71692e9be Replace my previous change for 32 bit systems with hz > 169 with Bruce's
simpler one.
2005-03-12 00:13:45 +00:00
Peter Wemm
2afec87508 Make the tty vmin/vtime timeouts work for hz > 169 on 32 bit machines. 2005-03-12 00:10:23 +00:00
Poul-Henning Kamp
3b3f38ed7d Add placeholder mutex argument to new_unrhdr(). 2005-03-07 11:05:47 +00:00
John Baldwin
9e6c867ccc Call tty_close() at the very end of ttyclose() since otherwise NULL
deferences can occur since tty_close() may end up freeing the tty structure
if it drops the last reference to it.

Glanced at by:	phk
2004-12-30 19:24:49 +00:00
Poul-Henning Kamp
118253ca24 fix a misleading sleep identifier. 2004-12-20 21:38:13 +00:00
Diomidis Spinellis
7690a6e4ba Improvements and fixes in the 1.241 commit:
- Have TS_ZOMBIE ttys return POLLHUP instead of POLLERR
- Remove unneeded POLLWRNORM (old bug)
- TS_ZOMBIE ttys will set POLLIN and POLLRDNORM
- Do not call selrecord in TS_ZOMBIE ttys

PR:             kern/73821
Reviewed by:	bde
MFC after:	4 weeks
2004-11-16 17:41:16 +00:00
Diomidis Spinellis
a04b2130a0 Return POLLERR rather than POLLIN/POLLOUT on TS_ZOMBIE ttys.
PR:		kern/73821
MFC after:	4 weeks
2004-11-11 16:10:54 +00:00
Poul-Henning Kamp
51f83da622 Restore TTYDEF_LFLAG to set echo bits. 2004-11-03 19:16:55 +00:00
Poul-Henning Kamp
95bc568977 Add new function ttyinitmode() which sets our systemwide default
modes on a tty structure.

Both the ".init" and the current settings are initialized allowing
the function to be used both at attach and open time.

The function takes an argument to decide if echoing should be enabled.
Echoing should not be enabled for regular physical serial ports
unless they are consoles, in which case they should be configured
by ttyconsolemode() instead.

Use the new function throughout.
2004-10-18 21:51:27 +00:00
Poul-Henning Kamp
33da4e5bd8 Make pty's always come up in echo mode. 2004-10-15 09:03:07 +00:00
Poul-Henning Kamp
fffc55152b Add missing chunk of code to enforce the lock-bits of termios.
This solves the problem where serial consoles suddenly required
DCD to be asserted.

Reported by:	Randy Bush <randy@psg.com>
2004-10-14 18:30:24 +00:00
Poul-Henning Kamp
43c72732aa Don't call driver close unless we have one. 2004-10-12 21:40:41 +00:00
John Baldwin
78c85e8dfc Rework how we store process times in the kernel such that we always store
the raw values including for child process statistics and only compute the
system and user timevals on demand.

- Fix the various kern_wait() syscall wrappers to only pass in a rusage
  pointer if they are going to use the result.
- Add a kern_getrusage() function for the ABI syscalls to use so that they
  don't have to play stackgap games to call getrusage().
- Fix the svr4_sys_times() syscall to just call calcru() to calculate the
  times it needs rather than calling getrusage() twice with associated
  stackgap, etc.
- Add a new rusage_ext structure to store raw time stats such as tick counts
  for user, system, and interrupt time as well as a bintime of the total
  runtime.  A new p_rux field in struct proc replaces the same inline fields
  from struct proc (i.e. p_[isu]ticks, p_[isu]u, and p_runtime).  A new p_crux
  field in struct proc contains the "raw" child time usage statistics.
  ruadd() has been changed to handle adding the associated rusage_ext
  structures as well as the values in rusage.  Effectively, the values in
  rusage_ext replace the ru_utime and ru_stime values in struct rusage.  These
  two fields in struct rusage are no longer used in the kernel.
- calcru() has been split into a static worker function calcru1() that
  calculates appropriate timevals for user and system time as well as updating
  the rux_[isu]u fields of a passed in rusage_ext structure.  calcru() uses a
  copy of the process' p_rux structure to compute the timevals after updating
  the runtime appropriately if any of the threads in that process are
  currently executing.  It also now only locks sched_lock internally while
  doing the rux_runtime fixup.  calcru() now only requires the caller to
  hold the proc lock and calcru1() only requires the proc lock internally.
  calcru() also no longer allows callers to ask for an interrupt timeval
  since none of them actually did.
- calcru() now correctly handles threads executing on other CPUs.
- A new calccru() function computes the child system and user timevals by
  calling calcru1() on p_crux.  Note that this means that any code that wants
  child times must now call this function rather than reading from p_cru
  directly.  This function also requires the proc lock.
- This finishes the locking for rusage and friends so some of the Giant locks
  in exit1() and kern_wait() are now gone.
- The locking in ttyinfo() has been tweaked so that a shared lock of the
  proctree lock is used to protect the process group rather than the process
  group lock.  By holding this lock until the end of the function we now
  ensure that the process/thread that we pick to dump info about will no
  longer vanish while we are trying to output its info to the console.

Submitted by:	bde (mostly)
MFC after:	1 month
2004-10-05 18:51:11 +00:00
Poul-Henning Kamp
0cd3cb9a15 Assign a global unit number for the tty slave devices (init/lock) using
the new subr_unit.c code.

For now assert Giant in ttycreate() and ttyfree().  It is not obvious that
it will ever pay off to lock these with anything else.
2004-09-30 10:38:48 +00:00
Poul-Henning Kamp
cf287576e5 Add functions to create and free the "tty-ness" of a serial port in a
generic way.  This code will allow a similar amount of code to be
removed from most if not all serial port drivers.

	Add generic cdevsw for tty devices.

	Add generic slave cdevsw for init/lock devices.

	Add ttypurge function which wakes up all know generic sleep
	points in the tty code, and calls into the hw-driver if it
	provides a method.

	Add ttycreate function which creates tty device and optionally
	cua device.  In both cases .init/.lock devices are created
	as well.

	Change ttygone() slightly to also call the hw driver provided
	purge routine.

	Add ttyfree() which will purge and destroy the cdevs.

	Add ttyconsole mode for setting console friendly termios
	on a port.
2004-09-28 19:33:49 +00:00
Poul-Henning Kamp
6f077de596 Hold threadcount while throbbing cdevsw in our underlying driver.
This is a bit heavyhanded, and will be simplified once the tty code
learns to properly deal with disappearing hw and drivers.
2004-09-24 08:26:03 +00:00
Poul-Henning Kamp
9e16d66689 Initialize new ttys a bit more.
Check TS_GONE flag for gone-ness.
2004-09-18 17:02:18 +00:00
Poul-Henning Kamp
e8d3e08098 Add ttyopen and ttyclose functions which will do the right stuff for
most if not all of our tty drivers in the future.

Centralizing this stuff enables us to remove about 100 lines of
almost but not quite perfectly copy&paste code from each tty driver.
2004-09-17 11:43:35 +00:00
Poul-Henning Kamp
3e6bf9fb86 Add ttyalloc() which in due time will be the successor to ttymalloc(),
but without the "struct tty *" argument.
2004-09-17 06:13:47 +00:00
John-Mark Gurney
ad3b9257c2 Add locking to the kqueue subsystem. This also makes the kqueue subsystem
a more complete subsystem, and removes the knowlege of how things are
implemented from the drivers.  Include locking around filter ops, so a
module like aio will know when not to be unloaded if there are outstanding
knotes using it's filter ops.

Currently, it uses the MTX_DUPOK even though it is not always safe to
aquire duplicate locks.  Witness currently doesn't support the ability
to discover if a dup lock is ok (in some cases).

Reviewed by:	green, rwatson (both earlier versions)
2004-08-15 06:24:42 +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
911dbd84c7 Introduce ttygone() which indicates that the hardware is detached.
Move dtrwait logic to the generic TTY level.
2004-07-11 15:18:39 +00:00
Poul-Henning Kamp
cb9ea5f4cb Pick the hotchar out of the tty structure instead of caching private
copies.

No current line disciplines have a dynamically changing hotchar, and
expecting to receive anything sensible during a change in ldisc is
insane so no locking of the hotchar field is necessary.
2004-06-26 09:20:07 +00:00
Poul-Henning Kamp
4776c07426 Fix line discipline switching issues: If opening a new ldisc fails,
we have to revert to TTYDISC which we know will successfully open
rather than try the previous ldisc which might also fail to open.

Do not let ldisc implementations muck about with ->t_line, and remove
code which checks for reopens, it should never happen.

Move ldisc->l_hotchar to tty->t_hotchar and have ldisc implementation
initialize it in their open routines.  Reset to zero when we enter
TTYDISC.  ("no" should really be -1 since zero could be a valid
hotchar for certain old european mainframe protocols.)
2004-06-26 08:44:04 +00:00
Poul-Henning Kamp
e77b206f0e Add two new methods to struct tty: One for manipulating BREAK condition
and one for fiddling modem-control signals.

Add generic code to deal with the relevant ioctls if these methods are
present.
2004-06-25 10:24:10 +00:00
Poul-Henning Kamp
075ef10234 #include <sys/serial.h> 2004-06-24 10:32:30 +00:00
Poul-Henning Kamp
98de21b633 Use CTASSERT to enforce the relationship between the new serial port
modem definitions and the old definitions from ioctls.
2004-06-24 10:06:55 +00:00
Poul-Henning Kamp
ec66f15d14 Put the pre FreeBSD-2.x tty compat code under BURN_BRIDGES. 2004-06-21 22:57:16 +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
1930e303cf Deorbit COMPAT_SUNOS.
We inherited this from the sparc32 port of BSD4.4-Lite1.  We have neither
a sparc32 port nor a SunOS4.x compatibility desire these days.
2004-06-11 11:16:26 +00:00
Poul-Henning Kamp
2195e4207a Reference count struct tty.
Add two new functions: ttyref() and ttyrel().  ttymalloc() creates a struct
tty with a reference count of one.  when ttyrel sees the count go to zero,
struct tty is freed.

Hold references for open ttys and for ttys which are controlling terminal
for sessions.

Until drivers start using ttyrel(), this commit will make no difference.
2004-06-09 09:41:30 +00:00
Poul-Henning Kamp
5df76176f7 Make linesw[] an array of pointers to linedesc instead of an array of
linedisc.
2004-06-07 20:45:45 +00:00
Poul-Henning Kamp
13e84a71e0 Centralize the line discipline optimization determination in a function
called ttyldoptim().

Use this function from all the relevant drivers.

I belive no drivers finger linesw[] directly anymore, paving the way for
locking and refcounting.
2004-06-04 21:55:55 +00:00
Poul-Henning Kamp
fe3ec6224a Manual edits to change linesw[]-frobbing to ttyld_*() calls. 2004-06-04 20:04:52 +00:00
Poul-Henning Kamp
2140d01b27 Machine generated patch which changes linedisc calls from accessing
linesw[] directly to using the ttyld...() functions

The ttyld...() functions ar inline so there is no performance hit.
2004-06-04 16:02:56 +00:00
Poul-Henning Kamp
d1afdc6644 Get rid of ttyregister(). All drivers now use ttymalloc() for struct
tty, so now we stand a chance of implementing refcounting and getting
rid of the damn things again.
2004-06-04 07:17:03 +00:00
Poul-Henning Kamp
3a95025ffc Introduce a ttyioctl() cdevsw default function. 2004-06-01 13:39:02 +00:00
Warner Losh
f36cfd49ad Remove advertising clause from University of California Regent's
license, per letter dated July 22, 1999 and email from Peter Wemm,
Alan Cox and Robert Watson.

Approved by: core, peter, alc, rwatson
2004-04-07 20:46:16 +00:00
Poul-Henning Kamp
8e1f1df080 Device megapatch 3/6:
Add missing D_TTY flags to various drivers.

Complete asserts that dev_t's passed to ttyread(), ttywrite(),
ttypoll() and ttykqwrite() have (d_flags & D_TTY) and a struct tty
pointer.

Make ttyread(), ttywrite(), ttypoll() and ttykqwrite() the default
cdevsw methods for D_TTY drivers and remove the explicit initializations
in various drivers cdevsw structures.
2004-02-21 20:41:11 +00:00
Brian Feldman
a0ed09c0af T -CURRENT DO NOT CRASH UPON ^T K PLZ THX.
Also, use sched_pctcpu() instead of assuming td->td_kse is non-NULL.
2004-02-14 01:30:06 +00:00
Robert Watson
5e312ddcc6 A variety of further cleanups to ttyinfo():
- Rename temporary variable names ("tmp", "tmp2") to more informative
  names ("load", "pctcpu", "rss", ...)

- Unclutter indentation and return paths: rather than lots of nested
  ifs, simply return earlier if it's not going to work out.  Simplify
  general structure and avoid "deep" code.

- Comment on the thread/process selection and locking.

- Correct handling of "running"/"runnable" states, avoid "unknown"
  that people were seeing for running processes.  This was due to
  a misunderstanding of the more complex state machine / inhibitors
  behavior of KSE.

- Do perform ttyinfo() printing on KSE (P_SA) processes, it seems
  generally to work.

While I initially attempted to formulate this as two commits (one
layout, the other content), I concluded that the layout changes were
really structural changes.

Many elements submitted by:  bde
2004-02-04 05:46:05 +00:00
Robert Watson
07eacae0d2 Improve the expressiveness of ttyinfo (^T) when dealing with threads
in slightly less usual states:

  If the thread is on a run queue, display "running" if the thread is
  actually running, otherwise, "runnable".

  If the thread is sleeping, and it's on a sleep queue, display the
  name of the queue, otherwise "unknown" -- previously, in this situation
  we would display "iowait".

  If the thread is waiting on a lock, display *lockname.

  If the thread is suspended, display "suspended" -- previously, in
  this situation we would display "iowait".

  If the thread is waiting for an interrupt, display "intrwait" --
  previously, in this situation we would display "iowait".

  If the thread is in a state not handled by the above, display
  "unknown" -- previously, we would print "iowait".

Among other things, this avoids displaying "iowait" when the foreground
process turns out to be suspended waiting for a debugger to properly
attach.
2004-01-08 22:49:23 +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
Ian Dowse
d29bf12ff8 Use a new message buffer `consmsgbuf' to forward messages to a
TIOCCONS console (e.g. xconsole) via a timeout routine instead of
calling into the tty code directly from printf(). This fixes a
number of cases where calling printf() at the wrong time (such as
with locks held) would cause a panic if xconsole is running.

The TIOCCONS message buffer is 8k in size by default, but this can
be changed with the kern.consmsgbuf_size sysctl. By default, messages
are checked for 5 times per second. The timer runs and the buffer
memory remains allocated only at times when a TIOCCONS console is
active.

Discussed on:	freebsd-arch
2003-06-22 02:54:33 +00:00
David Xu
0e2a4d3aeb Rename P_THREADED to P_SA. P_SA means a process is using scheduler
activations.
2003-06-15 00:31:24 +00:00
David E. O'Brien
677b542ea2 Use __FBSDID(). 2003-06-11 00:56:59 +00:00
Paul Saab
13d56a9a90 p_sigignore moved into struct sigacts. move one which was missed.
Approved by:	re (scottl)
2003-05-14 00:03:55 +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
213b19e9fb - Use a local struct proc variable to improve readability.
- Use a local variable to close a minor race when determining if the wmesg
    printed out needs a prefix such as when a thread is blocked on a lock.
2003-04-17 22:36:40 +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
David Schultz
9c62b3ee7c Make TTYHOG tunable.
Reviewed by:	mike (mentor)
2003-03-05 08:16:29 +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
Warner Losh
a163d034fa Back out M_* changes, per decision of the TRB.
Approved by: trb
2003-02-19 05:47:46 +00:00
Poul-Henning Kamp
f341ca9891 Remove #include <sys/dkstat.h> 2003-02-16 14:13:23 +00:00
Poul-Henning Kamp
3abd4ccf87 Move the tty related statistics counters to live with the tty code. 2003-02-16 13:22:15 +00:00
Tim J. Robbins
fbf70de6b0 Lock the proc around accessing p_siglist in ttycheckoutq() in the
unused wait != 0 case.
2003-02-10 06:06:46 +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
Don Lewis
91e97a8266 In an SMP environment post-Giant it is no longer safe to blindly
dereference the struct sigio pointer without any locking.  Change
fgetown() to take a reference to the pointer instead of a copy of the
pointer and call SIGIO_LOCK() before copying the pointer and
dereferencing it.

Reviewed by:	rwatson
2002-10-03 02:13:00 +00:00
John Baldwin
551cf4e150 Rename the mutex thread and process states to use a more generic 'LOCK'
name instead.  (e.g., SLOCK instead of SMTX, TD_ON_LOCK() instead of
TD_ON_MUTEX())  Eventually a turnstile abstraction will be added that
will be shared with mutexes and other types of locks.  SLOCK/TDI_LOCK will
be used internally by the turnstile code and will not be specific to
mutexes.  Making the change now ensures that turnstiles can be dropped
in at a later date without affecting the ABI of userland applications.
2002-10-02 20:31:47 +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
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
Julian Elischer
71fad9fdee Completely redo thread states.
Reviewed by:	davidxu@freebsd.org
2002-09-11 08:13:56 +00:00
Julian Elischer
9f189ade99 Clear up confusion in ugly code. ^T gave wrong results for RSS.
I misinterpretted this code when changing it to handle threads.
(there are still issues here)
Submitted by: Ian Dowse <iedowse@maths.tcd.ie>
2002-07-18 21:19:56 +00:00
Julian Elischer
e602ba25fd Part 1 of KSE-III
The ability to schedule multiple threads per process
(one one cpu) by making ALL system calls optionally asynchronous.
to come: ia64 and power-pc patches, patches for gdb, test program (in tools)

Reviewed by:	Almost everyone who counts
	(at various times, peter, jhb, matt, alfred, mini, bernd,
	and a cast of thousands)

	NOTE: this is still Beta code, and contains lots of debugging stuff.
	expect slight instability in signals..
2002-06-29 17:26:22 +00:00
Ian Dowse
99568bcaf7 Display the mutex name in the ^T status line if the selected thread
is blocked on a mutex. Prepend a '*' to distinguish this case as
is done in top(1).
2002-06-20 14:03:36 +00:00
Dag-Erling Smørgrav
7aa57dca57 Nit: kern.ttys is of type S,xtty, not S,tty. 2002-05-31 16:11:49 +00:00
Dag-Erling Smørgrav
6b658142fd Add some checks to prevent NULL dereferences.
Submitted by:	jhay
2002-05-28 14:29:56 +00:00
Dag-Erling Smørgrav
6c533ac713 Add NAI copyright. 2002-05-28 06:53:41 +00:00
Dag-Erling Smørgrav
1a149fcd67 Introduce struct xtty, used when exporting tty information to userland.
Make kern.ttys export a struct xtty rather than struct tty.  Since struct
tty is no longer exposed to userland, remove the dev_t / udev_t hack.

Sponsored by:	DARPA, NAI Labs
2002-05-28 05:40:53 +00:00
Dag-Erling Smørgrav
4b4c18f861 ANSIfy (significant portions were already partly ANSIfied) 2002-05-25 15:52:53 +00:00
Dag-Erling Smørgrav
b7457aabf6 Remove register. 2002-05-25 15:44:38 +00:00
Dag-Erling Smørgrav
dedf14f521 Automated whitespace cleanup. 2002-05-25 15:43:06 +00:00
Alfred Perlstein
e649887b1e Make funsetown() take a 'struct sigio **' so that the locking can
be done internally.

Ensure that no one can fsetown() to a dying process/pgrp.  We need
to check the process for P_WEXIT to see if it's exiting.  Process
groups are already safe because there is no such thing as a pgrp
zombie, therefore the proctree lock completely protects the pgrp
from having sigio structures associated with it after it runs
funsetownlst.

Add sigio lock to witness list under proctree and allproc, but over
proc and pgrp.

Seigo Tanimura helped with this.
2002-05-06 19:31:28 +00:00
Alfred Perlstein
f132072368 Redo the sigio locking.
Turn the sigio sx into a mutex.

Sigio lock is really only needed to protect interrupts from dereferencing
the sigio pointer in an object when the sigio itself is being destroyed.

In order to do this in the most unintrusive manner change pgsigio's
sigio * argument into a **, that way we can lock internally to the
function.
2002-05-01 20:44:46 +00:00
John Baldwin
596325f154 - Lock proctree_lock instead of pgrpsess_lock.
- Use temporary variables to hold a pointer to a pgrp while we dink with it
  while not holding either the associated proc lock or proctree_lock.  It
  is in theory possible that p->p_pgrp could change out from under us.
2002-04-16 17:09:22 +00:00
Ruslan Ermilov
12c79eb288 Dike out a highly insecure UCONSOLE option.
TIOCCONS must be able to VOP_ACCESS() /dev/console to succeed.

Obtained from:	OpenBSD
2002-04-03 10:56:59 +00:00
Seigo Tanimura
2a60b9b951 Fix leakage of p_pgrp lock. 2002-04-02 17:12:06 +00:00
John Baldwin
44731cab3b Change the suser() API to take advantage of td_ucred as well as do a
general cleanup of the API.  The entire API now consists of two functions
similar to the pre-KSE API.  The suser() function takes a thread pointer
as its only argument.  The td_ucred member of this thread must be valid
so the only valid thread pointers are curthread and a few kernel threads
such as thread0.  The suser_cred() function takes a pointer to a struct
ucred as its first argument and an integer flag as its second argument.
The flag is currently only used for the PRISON_ROOT flag.

Discussed on:	smp@
2002-04-01 21:31:13 +00:00
Alfred Perlstein
4d77a549fe Remove __P. 2002-03-19 21:25:46 +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
Seigo Tanimura
183ccde6c6 Stop abusing the pgrpsess_lock. 2002-03-11 07:53:13 +00:00
Seigo Tanimura
92c914f936 Fix lock leakage and late unlock.
Submitted by:	bde
2002-03-02 12:42:24 +00:00
Poul-Henning Kamp
e9be968e95 Fix a typo (?) in previous commit told ttyprintf() to print the integer
part of the user-time as a 64bit quantity.  This resulted in weird
output from SIGINFO.
2002-02-24 19:56:41 +00:00
Seigo Tanimura
f591779bb5 Lock struct pgrp, session and sigio.
New locks are:

- pgrpsess_lock which locks the whole pgrps and sessions,
- pg_mtx which protects the pgrp members, and
- s_mtx which protects the session members.

Please refer to sys/proc.h for the coverage of these locks.

Changes on the pgrp/session interface:

- pgfind() needs the pgrpsess_lock held.

- The caller of enterpgrp() is responsible to allocate a new pgrp and
  session.

- Call enterthispgrp() in order to enter an existing pgrp.

- pgsignal() requires a pgrp lock held.

Reviewed by:	jhb, alfred
Tested on:	cvsup.jp.FreeBSD.org
		(which is a quad-CPU machine running -current)
2002-02-23 11:12:57 +00:00
Peter Wemm
2b8a08af6b Fix a couple of style bugs introduced (or touched by) previous commit. 2002-02-07 23:06:26 +00:00
Julian Elischer
079b7badea Pre-KSE/M3 commit.
this is a low-functionality change that changes the kernel to access the main
thread of a process via the linked list of threads rather than
assuming that it is embedded in the process. It IS still embeded there
but remove all teh code that assumes that in preparation for the next commit
which will actually move it out.

Reviewed by: peter@freebsd.org, gallatin@cs.duke.edu, benno rice,
2002-02-07 20:58:47 +00:00
Peter Wemm
857ff6155b utime/stime.tv_sec are elapsed times, not relative to 1970. We can
safely print them as longs.  Even if ^T overflows after a process
has accumulated 68 years of user or system time, it is no big deal.
2001-11-17 00:26:57 +00:00
Peter Wemm
aa89942676 You cannot cast a time_t to quad_t and printf it with %lld. quad_t is
64 bits, not long long.
2001-11-16 23:53:48 +00:00
Robert Watson
fc5d29ef7d o Move suser() calls in kern/ to using suser_xxx() with an explicit
credential selection, rather than reference via a thread or process
  pointer.  This is part of a gradual migration to suser() accepting
  a struct ucred instead of a struct proc, simplifying the reference
  and locking semantics of suser().

Obtained from:	TrustedBSD Project
2001-11-01 20:56:57 +00:00
Matthew Dillon
434d21ccbf Make ttyprintf() of tv_sec value type agnostic. 2001-10-29 01:23:28 +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
Peter Wemm
b03a0c9e5e Fix a warning on alpha (real problem) and make pstat -t work as a bonus.
'struct tty' was out of sync in user and kernel due to dev_t/udev_t
mixups.  This takes advantage of the fact that dev_t changes type in
userland, so it isn't too pretty.
2001-09-10 12:05:47 +00:00
Thomas Moestl
12543b2e98 Export the tk_nin and tk_nout variables (number of tty input/output
characters) as sysctls (kern.tty_nin and kern.tty_nout).
2001-08-04 18:09:24 +00:00
Dima Dorfman
0150c6e83d Unifdef DEV_SNP; snp(4) no longer requires these ugly hacks.
Silence by:	-hackers, -audit
2001-05-22 22:16:18 +00:00
Mark Murray
fb919e4d5a Undo part of the tangle of having sys/lock.h and sys/mutex.h included in
other "system" header files.

Also help the deprecation of lockmgr.h by making it a sub-include of
sys/lock.h and removing sys/lockmgr.h form kernel .c files.

Sort sys/*.h includes where possible in affected files.

OK'ed by:	bde (with reservations)
2001-05-01 08:13:21 +00:00
John Baldwin
19eb87d22a Grab the process lock while calling psignal and before calling psignal. 2001-03-07 03:37:06 +00:00
Assar Westerlund
3617ddfc33 implement OCRNL, ONOCR, and ONLRET
Obtained from:	NetBSD
2001-03-04 06:04:50 +00:00
Jonathan Lemon
9bfd6482c8 Fix tab breakage from last commit.
Spotted by: bde
2001-02-17 19:40:22 +00:00
Jonathan Lemon
608a3ce62a Extend kqueue down to the device layer.
Backwards compatible approach suggested by: peter
2001-02-15 16:34:11 +00:00
Bosko Milekic
9ed346bab0 Change and clean the mutex lock interface.
mtx_enter(lock, type) becomes:

mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks)
mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized)

similarily, for releasing a lock, we now have:

mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN.
We change the caller interface for the two different types of locks
because the semantics are entirely different for each case, and this
makes it explicitly clear and, at the same time, it rids us of the
extra `type' argument.

The enter->lock and exit->unlock change has been made with the idea
that we're "locking data" and not "entering locked code" in mind.

Further, remove all additional "flags" previously passed to the
lock acquire/release routines with the exception of two:

MTX_QUIET and MTX_NOSWITCH

The functionality of these flags is preserved and they can be passed
to the lock/unlock routines by calling the corresponding wrappers:

mtx_{lock, unlock}_flags(lock, flag(s)) and
mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN
locks, respectively.

Re-inline some lock acq/rel code; in the sleep lock case, we only
inline the _obtain_lock()s in order to ensure that the inlined code
fits into a cache line. In the spin lock case, we inline recursion and
actually only perform a function call if we need to spin. This change
has been made with the idea that we generally tend to avoid spin locks
and that also the spin locks that we do have and are heavily used
(i.e. sched_lock) do recurse, and therefore in an effort to reduce
function call overhead for some architectures (such as alpha), we
inline recursion for this case.

Create a new malloc type for the witness code and retire from using
the M_DEV type. The new type is called M_WITNESS and is only declared
if WITNESS is enabled.

Begin cleaning up some machdep/mutex.h code - specifically updated the
"optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN
and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently
need those.

Finally, caught up to the interface changes in all sys code.

Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
Peter Wemm
810d0bd1a9 Turn '#if NSNP > 0' into an option. 2001-01-29 09:43:36 +00:00
John Baldwin
168666be74 - Catch up to proc flag changes.
- Assert sched_lock is held in proc_compare.
2001-01-24 11:15:59 +00:00
John Baldwin
27e864e300 - All of proc_compare needs sched_lock, so hold it for the for loop that
calls it rather than obtaining and releasing it a lot in proc_compare.
- Collect all of the data gathering and stick it just after the
  proc_compare loop.  This way, we only have to grab sched_lock once now
  when handling SIGINFO.  All the printf's are done after the values are
  calculated.

Submitted mostly by:	bde
2001-01-20 23:03:20 +00:00
John Baldwin
4848fbae35 Be more careful with sched_lock in the SIGINFO handler. Specifically, do
not hold sched_lock while calling ttyprintf().  If we are on a serial
console, then ttyprintf() will end up getting the sio lock, resulting in
a lock order violation.

Noticed by:	des
2001-01-20 02:04:44 +00:00
David Malone
7cc0979fd6 Convert more malloc+bzero to malloc+M_ZERO.
Submitted by:	josh@zipperup.org
Submitted by:	Robert Drehmel <robd@gmx.net>
2000-12-08 21:51:06 +00:00
John Baldwin
0ebabc93a4 Protect p_stat with sched_lock. 2000-12-02 01:32:51 +00:00
Jordan K. Hubbard
7022a92395 Kernel support for erase2 character.
Submitted by:	Rui Pedro Mendes Salgueiro <rps@mat.uc.pt>
2000-11-28 20:03:23 +00:00
Jason Evans
0384fff8c5 Major update to the way synchronization is done in the kernel. Highlights
include:

* Mutual exclusion is used instead of spl*().  See mutex(9).  (Note: The
  alpha port is still in transition and currently uses both.)

* Per-CPU idle processes.

* Interrupts are run in their own separate kernel threads and can be
  preempted (i386 only).

Partially contributed by:	BSDi (BSD/OS)
Submissions by (at least):	cp, dfr, dillon, grog, jake, jhb, sheldonh
2000-09-07 01:33:02 +00:00
Poul-Henning Kamp
77978ab8bc Previous commit changing SYSCTL_HANDLER_ARGS violated KNF.
Pointed out by:	bde
2000-07-04 11:25:35 +00:00
Poul-Henning Kamp
82d9ae4e32 Style police catches up with rev 1.26 of src/sys/sys/sysctl.h:
Sanitize SYSCTL_HANDLER_ARGS so that simplistic tools can grog our
sources:

        -sysctl_vm_zone SYSCTL_HANDLER_ARGS
        +sysctl_vm_zone (SYSCTL_HANDLER_ARGS)
2000-07-03 09:35:31 +00:00
Jake Burkholder
e39756439c Back out the previous change to the queue(3) interface.
It was not discussed and should probably not happen.

Requested by:		msmith and others
2000-05-26 02:09:24 +00:00
Jake Burkholder
740a1973a6 Change the way that the queue(3) structures are declared; don't assume that
the type argument to *_HEAD and *_ENTRY is a struct.

Suggested by:	phk
Reviewed by:	phk
Approved by:	mdodd
2000-05-23 20:41:01 +00:00
Andrey A. Chernov
051f60b976 Move t_timeout initializing to ttyregister
Pointed-by: bde
2000-05-01 10:51:54 +00:00
Andrey A. Chernov
4eaed34ba0 Set t_timeout to its default sysctl value only once in ttyopen
Initialize t_timeout to -1 for this reason

Pointed-by: bde
2000-05-01 09:05:03 +00:00
Andrey A. Chernov
c1d0c3a89d Add sysctl variable to set initial drainwait timeout on ttyopen, default to
5 minutes
2000-04-30 16:00:53 +00:00
Andrey A. Chernov
2cddfc0992 Add default 5min timeout for output drain to stop hanging on exit or in other
places when connection dropped
2000-04-27 20:14:21 +00:00
Archie Cobbs
b76f24f759 Fix a bug where SIGIO was not being delivered to a process requesting
async I/O when a tty device became writable.

PR:		kern/8324
Submitted by:	Don Lewis <Don.Lewis@tsc.tdk.com>
2000-04-05 18:38:21 +00:00
Archie Cobbs
ee51b2c45f Back out previous commit; it was premature. 2000-01-28 17:11:07 +00:00