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Path: utzoo!hcr!hcrvx2!jimr
From: jimr@hcrvx2.UUCP (Jim Robinson)
Newsgroups: comp.unix.wizards
Subject: Re: BSD to SysV
Message-ID: <3013@hcrvx2.UUCP>
Date: Tue, 27-Oct-87 11:14:17 EST
Article-I.D.: hcrvx2.3013
Posted: Tue Oct 27 11:14:17 1987
Date-Received: Fri, 30-Oct-87 21:39:17 EST
References: <9940@brl-adm.ARPA> <31892@sun.uucp>
Reply-To: jimr@hcr.UUCP (Jim Robinson)
Organization: HCR Corporation, Toronto
Lines: 18
Summary: 

In article <31892@sun.uucp> guy@gorodish.UUCP writes:
>> Has anyone figured out how to perform the BSD functions ``fsync()''
>> and ``ftruncate()'' in System V?
>
>You can get the same general effect as "fsync" in some S5 implementations by
>using "fcntl" to turn the O_SYNC flag on for a file descriptor; this flag
>causes all writes to that descriptor to be done synchronously.

This feature does not seem to be documented for SVR2 (or SVR2V2),
however, the supporting kernel code does appear to be there. Is this
another instance of AT&T forgetting to document a feature, or am I not
looking in the right place, or is there another explanation?

PS The documentation I am referring to is the standard AT&T "Programmer
Reference Manual" and the "Version 2 Supplement" for VAX 11/780 - 11/750
Processors.

J.B. Robinson