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Module: IO
Function: hClose
Type: Handle -> IO ()
Description: hClose hdl makes handle hdl closed. Before the computation finishes, if hdl is writable its buffer is flushed as for hFlush. If the operation fails for any reason, any further operations on the handle will still fail as if hdl had been successfully closed.
Related:

Example 1
Program source: 

import IO

main = do hdl <- openFile "/tmp/foo.txt" WriteMode
	  hPutStr hdl "Hello, world!"
	  hClose hdl
	  hdl <- openFile "/tmp/foo.txt" ReadMode
	  x <- hGetContents hdl
	  putStr x
	  hClose hdl

Output: Hello, world!