From: dbe AT wgn DOT net ("$Bill Luebkert")
Subject: Re: rename() in B18..
13 Jun 1997 20:54:51 -0700
Approved: cygnus DOT gnu-win32 AT cygnus DOT com
Distribution: cygnus
Message-ID: <33A1EEEC.1243.cygnus.gnu-win32@wgn.net>
References: <2 DOT 2 DOT 32 DOT 19970613015953 DOT 00687970 AT wilmington DOT net>
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Original-To: Keet <Keetnet AT wilmington DOT net>
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Keet wrote:
> 
> The following C code example, is proof that RENAME() or UNLINK() does not
> work reliably. After being told so many times it's the source's fault, I'm
> relieved to have found someone who knows what they're talking about and who
> could help me with this. What's happening is that when a file is unlinked,
> it isn't really unlinked. From what I'm told, there is no way to UNLINK an
> open file under a FAT based system. This is because in a FAT based system,
> the filename IS the file.. under UNIX, this is not the case. How you got
> around that, is beyond me. From what I can tell, the file is NOT unlinked,
> because when the following test program ends, test1 still exists. If this is
> not the case, then it's still failing to rename, because I get an error, and
> both test1 and test2 still exist. This isn't normal operation. Under 17.1
> this worked lovely, no problem at all. It even worked in Linux.. but under
> 18.. it messes up completely. If anyone can offer any help to me.. please
> reply ASAP.
> 
> ==============================START TEST.C====================================
> 
> /* rename() and unlink() failure */
> #include <stdio.h>
> 
> main()
> {
>     FILE *test1,*test2;
> 
>     if( (test1=fopen("test1","w")) == NULL) {
>         printf("Unable to fopen() test1!\n");
>         exit(1);
>     }
> 
>     if( (test2=fopen("test2","w")) == NULL) {
>         printf("Unable to fopen() test2!\n");
>         exit(1);
>     }
> 
>     if( fputs("This is test 1...\n",test1) < 0) {
>         printf("Unable to write to test1!\n");
>         exit(1);
>     }
> 
>     if( fputs("This is test 2...\n",test2) < 0) {
>         printf("Unable to write to test2!\n");
>         exit(1);
>     }

Try moving these to here:
      fclose(test1);
      fclose(test2);

>     if( unlink("test1") < 0) {
>         printf("Unable to unlink test1!\n");
>         exit(1);
>     }
> 
>     if( rename("test2","test1") < 0 ) {
>         printf("Unable to rename test2 to test1!\n");
>         exit(1);
>     }
> 
>     fclose(test1);
>     fclose(test2);

And delete from here.

> }
> 
> ==================================END TEST.C=================================

-- 
  ,-/-  __      _  _         $Bill Luebkert
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