redhat man page for fblocked

fblocked(n)						       Tcl Built-In Commands						       fblocked(n)

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NAME
       fblocked - Test whether the last input operation exhausted all available input

SYNOPSIS
       fblocked channelId
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DESCRIPTION
       The  fblocked command returns 1 if the most recent input operation on channelId returned less information than requested because all avail-
       able input was exhausted.  For example, if gets is invoked when there are only three characters available  for  input  and  no  end-of-line
       sequence, gets returns an empty string and a subsequent call to fblocked will return 1.

SEE ALSO
       gets(n), open(n), read(n)

KEYWORDS
       blocking, nonblocking

Tcl									7.5							       fblocked(n)