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From: guy@auspex.auspex.com (Guy Harris)
Newsgroups: comp.unix.sysv386
Subject: Re: ftruncate for System Vr3.2
Message-ID: <4036@auspex.auspex.com>
Date: 7 Sep 90 18:21:45 GMT
References: <9009060047.AA23962@esegue.segue.boston.ma.us>
Organization: Auspex Systems, Santa Clara
Lines: 6

>Note that this scores near zero in the portability department; I don't
>know what SVR4 does but would expect it to have the BSD ftruncate.

S5R4's "native" interface for doing that is the F_FREESP "fcntl" call. 
"truncate()" and "ftruncate()" exist in the standard library as wrappers
around that "fcntl()".