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Module: IO
Function: hIsEOF
Type: Handle -> IO Bool
Description: For a readable handle hdl, computation hIsEOF hdl returns True if no further input can be taken from hdl; for a handle attached to a physical file this means that the current I/O position is equal to the length of the file. Otherwise, it returns False. The computation isEOF is identical, except that it works only on stdin.
Related:

Example 1
File: /tmp/foo.txt : 

Hello, world!

Program source: 

import IO

main =  do hdl <- openFile "/tmp/foo.txt" ReadMode
	   aaa hdl

aaa hdl =  do t <- hIsEOF hdl
	      if t then return()
	           else do x <- hGetChar hdl
			   putChar x
			   aaa hdl

Output: Hello, world!