Document DDB capture facility.
MFC after: 3 months
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@ -59,7 +59,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 6, 2007
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.Dd December 25, 2007
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.Dt DDB 4
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.Os
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.Sh NAME
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@ -593,6 +593,39 @@ Hard reset the system.
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.It Ic help
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Print a short summary of the available commands and command
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abbreviations.
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.Pp
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.It Ic capture on
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.It Ic capture off
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.It Ic capture reset
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.It Ic capture status
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.Nm
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supports a basic output capture facility, which can be used to retrieve the
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results of debugging commands from userpsace using
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.Xr sysctl 2 .
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.Ic capture on
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enables output capture;
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.Ic capture off
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disables capture.
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.Ic capture reset
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will clear the capture buffer and disable capture.
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.Ic capture status
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will report current buffer use, buffer size, and disposition of output
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capture.
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.Pp
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Userspace processes may inspect and manage
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.Nm
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capture state using
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.Xr sysctl 8 :
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.Pp
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.Dv debug.ddb.capture.bufsize
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may be used to query or set the current capture buffer size.
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.Pp
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.Dv debug.ddb.capture.maxbufsize
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may be used to query the compile-time limit on the capture buffer size.
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.Pp
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.Dv debug.ddb.capture.bytes
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may be used to query the number of bytes of output currently in the capture
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buffer.
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.El
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.Sh VARIABLES
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The debugger accesses registers and variables as
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