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Home > C Interview Questions >

How can you restore a redirected standard stream ?

 The preceding example showed how you can redirect a standard stream from within your program. But what if later in your program you wanted to restore the standard stream to its original state?

By using the standard C library functions named dup() and fdopen(), you can restore a standard stream such as stdout to its original state.

The dup() function duplicates a file handle. You can use the dup() function to save the file handle corresponding to the stdout standard stream.

The fdopen() function opens a stream that has been duplicated with the dup() function. 

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