NAME

rdbfs − remote kernel debugging file system

SYNOPSIS

­rdbfs [ ­-d ] [ ­-p ­pid ] [ ­-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). 

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 kernel 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 consolefs(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)

Plan 9  —  December 11, 1999