No. You can duplicate a file POINTER. You can't duplicate a file
STRUCTURE. There is no excuse for it either -- your user program
should never mess with a FILE structure but only have pointers to it.
>
> Glibc doesn't check the contents of the FILE structures, just
> the addresses and since it "knows" the pointer received was not
> one it provided, it generates signal 11 on its own. Is this
> REALLY what is supposed to happen? After all, the function call
> did get a perfectly valid pointer to the required structure.
>
No it didn't. You duplicated the FILE *structure*, which may itself
contain pointers to other structures inside libc.
Your program is totally and utterly broken. SIGSEGV is a perfectly
acceptable and quite reasonable.
-hpa
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