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Module: IO
Function: hGetBuffering
Type: Handle -> IO BufferMode
Description: Computation hGetBuffering hdl returns the current buffering mode for hdl. The default buffering mode when a handle is opened is implementation-dependent and may depend on the file system object which is attached to that handle.
Related:

Example 1
Program source: 

import IO

main = do x <- openFile "/tmp/foo.txt" ReadMode
          y <-hGetBuffering x
          print y

Output: BlockBuffering Nothing