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From: Roland McGrath <roland@redhat.com>
To: GNU libc hackers <libc-hacker@sources.redhat.com>
Subject: EOVERFLOW for ftell, ftello, fgetpos?
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Aren't ftell, ftello, and fgetpos supposed to diagnose EOVERFLOW?
(A program could fopen, fread pieces totalling >4GB, and then call ftell.)

Right now these functions all just truncate the result of _IO_seekoff to 32
bits (and treat 4294967295 as an error).  Unless someone tells me why I'm
wrong about thinking this is a bug, I will fix them to detect overflow.