Date: Fri, 30 Oct 1998 22:39:02 +0100 (CET) From: Arjan de Vet <Arjan.deVet@adv.iae.nl> To: hackers@FreeBSD.ORG Subject: Possible bug in freopen()? Message-ID: <199810302139.WAA13889@adv.iae.nl>
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Hi,
I may have found a bug in freopen() while testing INN 2.2-stable.
Consider the following program:
#include <stdio.h>
#include <unistd.h>
main () {
FILE *f, *g;
long i;
g = fopen("/tmp/test", "a");
f = freopen("/tmp/test", "a", g);
i = ftell(f);
printf("%d\n", i);
fprintf(f, "test");
i = ftell(f);
printf("%d\n", i);
close(f);
}
Start with an empty /tmp/test file and run the program three times
consecutively. The results on BSD/OS 3.0, FreeBSD 2.2.7-stable and Solaris
2.6 are:
BSDI 3.0 FreeBSD 2.2.7 Solaris
-----------------------------------------------------------------------------
0 0 0
4 4 4
0 0 4
8 4 8
0 0 8
12 4 12
Hmm... Quite different. I think Solaris shows the correct behaviour. In each
case /tmp/test contains "testtesttest" after the running the program three
times.
Arjan
--
Arjan de Vet, Eindhoven, The Netherlands <Arjan.deVet@adv.iae.nl>
URL: http://www.iae.nl/users/devet/ for PGP key: finger devet@iae.nl
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