V1/man/man2/fstat.2

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        11/3/71                                                SYS FSTAT (II)

NAME              fstat -- get status of open file

SYNOPSIS          (file descriptor in r0)
                  sys      fstat; buf          / fstat = 28.

DESCRIPTION       This call is identical to stat, except that it operates on
                  open files instead of files given by name. It is most
                  often used to get the status of the standard input and
                  output files, whose names are unknown.

FILES

SEE ALSO          sys stat

DIAGNOSTICS       The error bit (c--bit) is set if the file descriptor is
                  unknown.
BUGS

OWNER             ken, dmr