term% cat index.txt RDBFS(4) Kernel Interfaces Manual RDBFS(4)
NAME
rdbfs - remote kernel debugging file system
SYNOPSIS
rdbfs [ -d ] [ -p pid ] [ -s srvname ] [ -t text ] [ device ]
DESCRIPTION
Rdbfs presents in /proc/pid (default /proc/1) a set of process files
for debugging a kernel over the serial line device (default /dev/eia0).
If the -s option is given, rdbfs will post its channel in /srv/srvname
(see srv(3)), allowing the session to be shared or reattached later.
The text file presented is just a copy of text (default /386/9pc). It
can usually be ignored, since the debuggers open kernel files directly
rather than using /proc/n/text.
Kernels can be remotely debugged only when they are suspended and
serving a textual debugging protocol over their serial lines. Typing
``^t^td'' (control-t, control-t, d) at the console will cause the ker‐
nel to enter this mode when it `panics'. Typing ``^t^tD'' causes the
kernel to enter this mode immediately.
Because the debugging protocol is textual, a console provided by con‐
solefs(4) may be substituted for the serial device.
SOURCE
/sys/src/cmd/rdbfs.c
/sys/src/9/port/rdb.c
SEE ALSO
acid(1), db(1), consolefs(4)
RDBFS(4)