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Re: sed bug on seekable stdin

From: Chuck Swiger
Subject: Re: sed bug on seekable stdin
Date: Sun, 17 Dec 2006 14:21:18 -0500
User-agent: Thunderbird (Windows/20061025)

Bob Proulx wrote:
Paolo Bonzini wrote:
[ ... ]
AFAIK fflush() is not needed in input streams as its purpose is to
flush pending output buffers and input streams have none.


+      fseek(stdin, 0, SEEK_CUR);
+      fclose(stdin);

How are I/O errors on stdin handled in this case?

A good question.

I'd like to understand the motivation of this patch a little better; it is to ensure something like consistent tape positioning if you attach sed's stdin to a non-rewind tape drive (/dev/nst or similar)? Or are you trying to make sure that some utility earlier in the pipeline doesn't get an unexpected SIGPIPE?


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