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From: chris@nrcvax.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: BSD to SysV
Message-ID: <1249@nrcvax.UUCP>
Date: Tue, 27-Oct-87 15:26:29 EST
Article-I.D.: nrcvax.1249
Posted: Tue Oct 27 15:26:29 1987
Date-Received: Sun, 1-Nov-87 01:44:30 EST
References: <9940@brl-adm.ARPA> <31892@sun.uucp>
Reply-To: chris@minnie.UUCP (Chris Grevstad)
Organization: Frobozo Items Co. Inc. Ltd.
Lines: 19

guy%gorodish@Sun.COM (Guy Harris) says:
>> Has anyone figured out how to perform the BSD functions ``fsync()''
>> and ``ftruncate()'' in System V?
>
>Unless you're truncating a file to zero length, you can't do "ftruncate()"
>except by making a copy of the file up to the new length, doing a "creat" or
>"open" with O_TRUNC to truncate the original file to zero length, and then
>copying the truncated copy on top of the original file.

This will give you truncate(), not ftruncate(), which requires a file
descriptor, and if that's all you have, then you're in trouble.

-- 
	Chris Grevstad
	cit-vax!elroy!nrcvax!chris@rutgers.edu
	hplabs!sdcrdcf!psivax!nrcvax!chris
	ihnp4!nrcvax!chris

  Where subtlety fails us we must simply make do with cream pies.