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     The setmode function sets the translation mode of the file given
     by <handle> to <mode>. The mode must be either the O_TEXT or
     O_BINARY manifest constant.
 
     The setmode function is typically used to modify the default
     translation mode of stdin, stdout, stderr, stdaux, and stdprn, but
     it can be used on any file. If setmode is applied to the file
     handle for a stream, the setmode function should be called before
     any input or output operations are performed on the stream.
 
     Return Value
 
     If successful, setmode returns the previous translation mode. A
     return value of -1 indicates an error, and errno is set to either
     EBADF or EINVAL.
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