ratrace leaves processes in a stopped state

once ratrace detaches from a process, it will leave the program in a Stopped 
state, not running. for it to continue you must manually start the process 
again. it should start the processes when it exits, or at least provide a flag 
to do so.

; tail -f /dev/kmesg &
; ratrace $apid
422695 tail Fstat 2071aa 3 0x407d30 115
422695 tail Fstat  = 78 "" 1415510097499842905 1415510097499846326
422695 tail Pread 20719b 3 0x7ffffeffcea4 8192 -1
422695 tail Pread /"" 8192 -1 = 0  1415510097724829693 1415510097724830857
422695 tail Fstat 2071aa 3 0x407e10 115
422695 tail Fstat  = 78 "" 1415510097938883115 1415510097938886785
422695 tail Sleep 202ee0 5000

<send del to ratrace here>

echo start > /proc/422695/ctl; echo kill > /proc/422695/note
; 
; ps | grep tail
mischief     422695    0:00   0:00       72K Stopped  tail
;

Original issue reported on code.google.com by mischief@offblast.org on 9 Nov 2014 at 5:16

ikrabbe / plan9front

ratrace leaves processes in a stopped state #225