Date: Tue, 6 Apr 1999 10:01:36 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Ville-Pertti Keinonen <will@iki.fi> Cc: current@freebsd.org Subject: Re: aio_read Message-ID: <199904061701.KAA09326@apollo.backplane.com> References: <Pine.BSF.3.96.990405141834.22049D-100000@fledge.watson.org> <199904051834.LAA11656@apollo.backplane.com.newsgate.clinet.fi> <86vhfam5vn.fsf@not.oeno.com>
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:
:Matthew Dillon <dillon@apollo.backplane.com> writes:
:
:> UNIX has been broken this way from day 1. It was a major design mistake.
:> The only way to get your own descriptor seek offset is to open() the
:> file again.
:
:It's not necessarily breakage. Not having any mechanism other than
:open to get your own seek offset is nasty, but sharing a seek offset
:can also be useful. File descriptors can't be "reverse-inherited", so
:in order to continue writing to the same redirected output file, a
:sequence of commands executed by a shell needs to be able to share the
:actual file offset. I believe this was the original reason for the
:behavior.
If it's a redirected output file you simply make it O_APPEND, at which
point the seek offset in the descriptor becomes irrelevant.
-Matt
Matthew Dillon
<dillon@backplane.com>
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