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From: bzs@BU-CS.BU.EDU (Barry Shein)
Newsgroups: net.unix-wizards
Subject: Minor bug in msgs.c
Message-ID: <2831@brl-smoke.ARPA>
Date: Wed, 6-Aug-86 15:08:48 EDT
Article-I.D.: brl-smok.2831
Posted: Wed Aug  6 15:08:48 1986
Date-Received: Sat, 9-Aug-86 05:48:50 EDT
Sender: news@brl-smoke.ARPA
Lines: 27


[4.3bsd]

DESCRIPTION:

If msgs finds an out of bounds .msgsrc it warns the user
and truncates it in preparation to reset it to a more
sane value. Unfortunately, it calls ftruncate() on a file
(.msgsrc) it just fclose'd.

REPEAT-BY:

Set your .msgsrc to some ridiculously high value, run msgs,
get warning message, quit. Look at .msgsrc file, it will
have two lines in it rather than one.

FIX:

Change (the only)
	ftruncate(fileno(msgsrc),0);
to
	truncate(fname,0);

(the code then goes on to re-open the file shortly thereafter so
it can update it.)

	-Barry Shein, Boston University