Date: Fri, 26 Jun 2020 07:14:00 +0200 From: Markus Wichmann <nullplan@....net> To: musl@...ts.openwall.com Subject: Re: errno not set to EBADF when reading from invalid descriptor On Thu, Jun 25, 2020 at 11:38:04AM -0400, Rich Felker wrote: > Note that there are lots of other reasons you can't safely use stdio > read functions on a stream you don't know is suitable for it. > Switching from writing to reading without a successful flush produces > UB, and switching the other direction without a successful seek does, > even if the FILE stream is open for both. > > Rich So I can't actually use a FILE open for reading and writing that refers to something non-seekable, like a serial line, to both read and write to it? I mean, I suppose I could write something and then flush and stay in read mode forever, but that is not really the nature of my application. I suppose I'll just open the serial line twice. Ciao, Markus
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