[Bug fortran/47694] New: Fortran read from named pipe fails to read all available data

[David.Duffy at qimr dot edu.au]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47694

           Summary: Fortran read from named pipe fails to read all
                    available data
           Product: gcc
           Version: fortran-dev
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: david.du...@qimr.edu.au


I am mucking around with named pipes and read().

program testpipe
  integer :: ios, n
  character (len=1024) :: lin
  open(7, file='tmpfifo')
  n=0
  do
    read(7,'(a)', iostat=ios) lin
    if (ios /= 0) exit
    n=n+1
    write(*,*) n, trim(lin)
  end do
end program testpipe

Using gfortran (4.6.0 20110209), this stops before reading all data in the pipe
unless it is further topped up from the other end ;) As written, no such
problem with sunf95, g95, openf95 (runs until pipe emptied, then waits for
more).  I presume it is a buffering problem somewhere.

Linux tinonee 2.6.32-27-generic #49-Ubuntu SMP Wed Dec 1 23:52:12 UTC 2010 i686
GNU/Linux

Cheers, David Duffy.