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Message: [QUOTE="Walter Roberson, post: 2453364"] C89 does not have an prohibition against it in the description of freopen(); it might somewhere else, perhaps. But in this connection, the footnote is informative: 116. The primary use of the freopen function is to change the file associated with a standard text stream (stderr, stdin, or stdout), as those identifiers need not be modifiable lvalues to which the value returned by the fopen function may be assigned. I would interpret that as being supportive of changing the mode as well as the association, in that it talks about providing a mechanism to essentially assign new values to those predefined identifiers -- and if one *could* just write to those identifiers (if they were lvalues) then one could put in a stream of a different mode. Of course, my interpretation is not to be considered "proof" ;-) [/QUOTE]