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Date: Fri, 29 May 2015 10:08:35 -0400
From: Rich Felker <>
Subject: Re: Making stdio writes robust/recoverable under errors

On Fri, May 29, 2015 at 09:53:00AM -0400, Rich Felker wrote:
> An attached test program demonstrates the issue. It assumes Linux 64k
> pipe buffers so it's not appropriate for inclusion in tests in its
> current form, but it gets the job done where it works. It attempts to
> send 128k over a pipe via write followed by a series of fwrite retries
> that are interrupted by signals that cause EINTR; thanks to the
> kernel's pipe buffer semantics, there's basically no timing/race
> aspect involved. With current musl, I get only 130560 across the pipe;
> with the above line removed, I get all 131072.

And here is the missing attachment. :-)


View attachment "fwrite_intr.c" of type "text/plain" (935 bytes)

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