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Document DDB capture facility.

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MFC after:	3 months
This commit is contained in:
Robert Watson 2007-12-25 23:25:04 +00:00
parent 086fec574e
commit 21262c0993
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=174911
1 changed files with 34 additions and 1 deletions
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35
share/man/man4/ddb.4
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@ -59,7 +59,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd August 6, 2007
.Dd December 25, 2007
.Dt DDB 4
.Os
.Sh NAME
@ -593,6 +593,39 @@ Hard reset the system.
.It Ic help
Print a short summary of the available commands and command
abbreviations.
.Pp
.It Ic capture on
.It Ic capture off
.It Ic capture reset
.It Ic capture status
.Nm
supports a basic output capture facility, which can be used to retrieve the
results of debugging commands from userpsace using
.Xr sysctl 2 .
.Ic capture on
enables output capture;
.Ic capture off
disables capture.
.Ic capture reset
will clear the capture buffer and disable capture.
.Ic capture status
will report current buffer use, buffer size, and disposition of output
capture.
.Pp
Userspace processes may inspect and manage
.Nm
capture state using
.Xr sysctl 8 :
.Pp
.Dv debug.ddb.capture.bufsize
may be used to query or set the current capture buffer size.
.Pp
.Dv debug.ddb.capture.maxbufsize
may be used to query the compile-time limit on the capture buffer size.
.Pp
.Dv debug.ddb.capture.bytes
may be used to query the number of bytes of output currently in the capture
buffer.
.El
.Sh VARIABLES
The debugger accesses registers and variables as