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Changing RedBoot's sys_read() function


I am considering making some changes to the sys_read() function in
packages/redboot/current/src/syscall.c to better handle console I/O.
(ie local echo, backspace handling, etc.)

Is this function only called for console I/O?  If not is there some way
to 
determine if the fd being read is the console?
 
thanks,

Drew

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