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From: ets@wrkgrp.COM (Edward T Spire)
Newsgroups: comp.unix.questions
Subject: Re: Truncating an existing file (and lockf question)
Message-ID: <1991Apr25.144430.350@wrkgrp.COM>
Date: 25 Apr 91 14:44:30 GMT
Article-I.D.: wrkgrp.1991Apr25.144430.350
References: <3172@dsacg3.dsac.dla.mil> <16836@chaph.usc.edu>
Distribution: usa
Organization: The Workstation Group
Lines: 22

In article <16836@chaph.usc.edu> jeenglis@alcor.usc.edu (Joe English) writes:
>nto0302@dsacg3.dsac.dla.mil (Bob Fisher) writes:
>>How can I truncate the end of a large file without copying the part
>>to be preserved to a new file and then doing a remove/rename?
>>
>>This is for SVR3 but may need ported to BSD4.3.
>
>Check for a system call called 'truncate' or 'ftruncate'.
>SunOS has these, but the man pages are (as usual) unclear
>as to whether they're from BSD, System V, both, or neither.
>I seem to remember seeing this under both BSD4.3 and SVR3.

ftruncate() seems to work everywhere we've tried, except
SCO/Unix.  W/ SCO/Unix, chsize() takes the same parms as
ftruncate() and does the same thing...

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