src-test2/sys/ddb, branch releng/6.4

Merge db_command.c from HEAD to RELENG_6:

2008-03-10T10:40:00Z

When killing a user process from DDB, check that the requested signal is > 0 rather than >= 0, or we will panic when trying to deliver the signal. PR: 100802 Submitted by: Valerio Daelli

Merge db_input.c:1.39 from HEAD to RELENG_6:

2008-03-10T10:23:37Z

Reserve two bytes at the end of the DDB input line in db_readline() to hold the newline and nul terminator. Otherwise, there are cases where garbage may end up in the command history due to a lack of a nul terminator, or input may end up without room for a newline. PR: 119079 Submitted by: Michael Plass

Merge db_input.c:1.38 from HEAD to RELENG_6:

2008-03-09T14:50:28Z

When redrawing an input line, count backspaces to get to the beginning of the input field from the current cursor location, rather than the end of the input line, as the cursor may not be at the end of the line. Otherwise, we may overshoot, overwriting a bit of the previous line and failing to fully overwrite the current line. PR: 119079 Submitted by: Michael Plass

MFC: rev. 1.61: remove the need to forward declare statics.

2007-10-23T16:07:30Z

MFC: Remove sparc64 & PowerPC MD 'reboot' and 'halt' commands and make them

2007-10-19T16:48:43Z

MI. 'reboot' is an alias for 'reset'.

Unbreak syscons' support for ddb mode by reactivating old fixes

2006-10-16T09:00:30Z

(syscons.c 1.331 and 1.372 are reactivated by restoring this part of db_interface.c (i386 version 1.48, ...) in a different file). This is not a MFC because larger changes than I have time for are needed there. The most noticeable effect of this fix is that syscons switches to the console vty on entry to ddb. The most important effect of this fix is that switching vtys in ddb doesn't try (and sometimes succeed) to crash the system by calling wakeup(). Approved by: re (hrs)

MFC several DDB improvements including the simpler 'ps', 'show proc',

2006-08-17T19:53:06Z

'show thread' (currently doesn't work due to a ddb bug that in 6.x that causes 'show thread' to be treated as 'show threads'), 'show lockmgr', 'show sleepchain', 'show lockchain', 'show allchains', 'show locktree', 'show sleepq', and 'show turnstile'.

MFC rev. 1.37:

2006-07-17T15:01:40Z

Never zero-out db_last_symtab. Whan backtraces are done in parallel in several threads, one symbol lookup could clear db_last_symtab when another one going to use it as starting point for traversal. Approved by: pjd (mentor)

MFC: Rename 'traceall' to 'alltrace' and add a 'bt' alias for 'trace'.

2005-10-25T20:10:56Z

Approved by: re (scottl)

Merge db_command.c:1.62 from HEAD to RELENG_6:

2005-10-06T13:15:21Z

Add a DDB "traceall" function, which stack traces all known process threads. This is quite useful if generating a debug log for post-mortem by another developer, in which case the person at the console may not know which threads are of interest. The output of this can be quite long. Discussed with: kris Approved by: re (scottl)