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That is not a reasonable approach. I don't have the C99 spec so as to read what its intent is supposed to be--but I find it hard to believe they intended POSIX systems to introduce the one place where you can expect to have the effect of determining a file name from a file descriptor (which in the general case cannot be done). The only thing that seems reasonable to me is that this is expected only to work in the common case where stdin/stdout/stderr are all copied from the same original descriptor on the tty, that having been opened O_RDWR. So, freopen's semantics would roughly match those of fdopen(fileno(stream), newmode)--which is to say that freopen can do the fcntl(F_GETFL) check on the requested new mode and tweak the stream state to match the requested new mode, but that is all.
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