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36 Commits

Author SHA1 Message Date
Ian Dowse
4784a46912 Replace the code for reading and writing the kernel message buffer 
with a new implementation that has a mostly reentrant "addchar"
routine, supports multiple message buffers in the kernel, and hides
the implementation details from callers.

The new code uses a kind of sequence number to represend the current
read and write positions in the buffer. This approach (suggested
mainly by bde) permits the read and write pointers to be maintained
separately, which reduces the number of atomic operations that are
required. The "mostly reentrant" above refers to the way that while
it is now always safe to have any number of concurrent writers,
readers could see the message buffer after a writer has advanced
the pointers but before it has witten the new character.

Discussed on:	freebsd-arch
 2003-06-22 02:18:31 +00:00
David E. O'Brien
560bb4f8b6 bufpos is used in size_t contexts, so make it one. 2003-05-02 07:08:52 +00:00
Johan Karlsson
82bbd989e7 These are WARNS=2 clean, try to keep them that way. 2003-02-23 13:25:02 +00:00
Tom Rhodes
ce66ddb763 s/filesystem/file system/g as discussed on -developers 2002-08-21 18:11:48 +00:00
Bruce Evans
7309e024bf Include <nlist.h> for nlist interfaces instead of depending on namespace 
pollution in <kvm.h>.
 2002-08-18 17:57:08 +00:00
Philippe Charnier
e1205e80e5 The .Nm utility 2002-07-06 19:34:18 +00:00
Warner Losh
1fa5ae8f93 o Remove __P 
o Use ANSI function definitions
o mark usage() as __dead2
 2002-03-19 13:29:39 +00:00
David E. O'Brien
2d68bf45bf Default to WARNS=2. 
Binary builds that cannot handle this must explicitly set WARNS=0.

Reviewed by:	mike
 2001-12-04 02:19:58 +00:00
Ruslan Ermilov
2a3c2c7651 mdoc(7) police: compute the exact tag width. 2001-08-10 10:09:00 +00:00
Sheldon Hearn
d118197980 Add mention of /var/run/dmesg.boot. 
Yes, this isn't really the right place for it.  No, it really can't
remain undocumented.
 2001-08-08 21:02:55 +00:00
Bill Fumerola
bcdb7cc8e4 add -a to usage() 
Submitted by:	Ashley Penney <ashp@unloved.org>
MFC after:	3 days
 2001-07-14 21:56:04 +00:00
Ruslan Ermilov
9fe48c6e8d mdoc(7) police: removed HISTORY info from the .Os call. 2001-07-10 11:04:34 +00:00
Thomas Moestl
d907e410f3 Update the dmesg man page to reflect the recent changes to dmesg. 
Reviewed by:	ru
 2001-07-05 12:32:57 +00:00
Thomas Moestl
676adc045c Use the kern.msgbuf sysctl to get the message buffer on a running 
kernel, and remove setgid kmem, which is not needed any more.
 2001-07-03 19:49:31 +00:00
Ruslan Ermilov
0a5779d45b - Backout botched attempt to introduce MANSECT feature. 
- MAN[1-9] -> MAN.
 2001-03-26 14:33:27 +00:00
Ruslan Ermilov
fe655281c5 Set the default manual section for sbin/ to 8. 2001-03-20 18:13:31 +00:00
Ruslan Ermilov
f806cd425e Backout -a restriction hack. 
Requested by:	rwatson
 2001-02-26 08:09:51 +00:00
Ruslan Ermilov
b52c326cfc Restrict -a to root only. 
PR:		bin/25337
 2001-02-24 10:16:54 +00:00
Sheldon Hearn
20fc4e5c7b Fix hard sentence break introduced in previous commit. 2000-12-20 13:23:50 +00:00
Poul-Henning Kamp
9d1334552f Add a -a option to show the entire message buffer. 2000-12-17 19:05:17 +00:00
Ruslan Ermilov
7c7fb079b9 mdoc(7) police: use the new features of the Nm macro. 2000-11-20 16:52:27 +00:00
Chris D. Faulhaber
2d45aed6bc Remove obsolete /dev/drum references 
Reviewed by:	alex, asmodai, billf
 2000-10-29 12:19:52 +00:00
Peter Wemm
7f3dea244c $Id$ -> $FreeBSD$ 1999-08-28 00:22:10 +00:00
Tim Vanderhoek
d6c37912c6 Use an error message that more clearly indites(sp?) an out-of-sync 
kernel+userland when that is the case.

PR:		bin/7414
 1998-07-27 18:53:45 +00:00
Philippe Charnier
970cd28246 Use .Pa for filenames. Use .Bl/.El in FILES section. Remove unused #includes. 1998-06-04 06:51:14 +00:00
Poul-Henning Kamp
58067a9909 Make the size of the msgbuf (dmesg) a "normal" option. 1998-05-19 08:58:53 +00:00
Warner Losh
8d64695c7c compare return value from getopt against -1 rather than EOF, per the final 
posix standard on the topic.
 1997-03-29 03:33:12 +00:00
Peter Wemm
c0ec1f37ef Revert $FreeBSD$ to $Id$ 1997-02-22 14:40:44 +00:00
Jordan K. Hubbard
1130b656e5 Make the long-awaited change from $Id$ to $FreeBSD$ 
This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore.  This update would have been
insane otherwise.
 1997-01-14 07:20:47 +00:00
Bruce Evans
301e6a175a Who would have though that dmesg didn't understand message buffers? 
Fixed the following bugs:
- the buffer was reprinted endlessly when msg.bufx == 0 and (for a
  different reason) when msg.bufx == 1.
- the last byte of the buffer wasn't printed except in the the infinite
  loop cases.
- the comment about walking the buffer didn't match the (correct) code.
- minor -Wall and style bugs.
Not fixed:
- excessive newline processing which hid the non-printing of the last
  byte of the buffer.
 1996-09-21 08:11:22 +00:00
Mark Murray
c76c299053 Add relevant files to the FILES section 
Submitted by:	Julian H Stacey
 1996-08-03 19:13:35 +00:00
Alexander Langer
b7a8c0221f Add #include <err.h>. 1996-06-19 01:49:01 +00:00
Andrey A. Chernov
8dcf55a40e Add setlocale LC_CTYPE 1995-10-23 23:36:55 +00:00
David Greenman
b3bfc7199e Converted 'vmunix' to 'kernel'. 1994-08-05 09:14:37 +00:00
Garrett Wollman
404c1a5fc1 Convert to our man installation style. Also fixed long-standing bug 
in `fastboot'/`fasthalt' in which the interpreter would hang around
after `reboot' or `halt' is run, causing an irritating ``Killed'' message.
 1994-08-05 02:42:42 +00:00
Rodney W. Grimes
8fae3551ec BSD 4.4 Lite sbin Sources 
Note:  XNSrouted and routed NOT imported here, they shall be imported with
usr.sbin.
 1994-05-26 06:35:07 +00:00