From owner-freebsd-hackers  Thu Jan 11 12:26:49 2001
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To: Alfred Perlstein <bright@wintelcom.net>
Cc: "Brian J. McGovern" <bmcgover@cisco.com>, hackers@FreeBSD.ORG
Subject: Re: Question about 'open' files.... 
In-reply-to: Your message of "Thu, 11 Jan 2001 12:21:47 PST."
             <20010111122147.E7240@fw.wintelcom.net> 
Date: Thu, 11 Jan 2001 15:26:19 -0500
From: "Brian J. McGovern" <bmcgover@cisco.com>
Sender: owner-freebsd-hackers@FreeBSD.ORG
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X-Loop: FreeBSD.ORG

Just for chuckles, try them in the same directory. That will emulate what
I've been doing here when having problems.
	-Brian

 > * Brian J. McGovern <bmcgover@cisco.com> [010111 12:06] wrote:
 > > I'm doing some tests for Greg on vinum (trying to crash it), and I've run
 > > across a problem that is not particular to vinum. I'm hoping someone can
 > > explain it to me and/or tell me how to work around it.
 > > 
 > > Using the code fragment (note: The code I'm using is actually more complex
,
 > > and checks for errors in opening, writing, etc, but I'm keeping it basic
 > > for the discussion):
 > > 
 > > for (counter = 0; counter < 20000; counter++)
 > >   {
 > >     x = open(filename,O_CREAT | O_WRONLY);
 > >     write(x, buffer, size);
 > >     close(x);
 > >   }
 > 
 > ok, I tried this:
 > 
 > ~/tst % cat t.c
 > #include <fcntl.h>
 > int main(int argc, char **argv) {
 >   int x, i, counter;
 > char    buf[200];
 >         char buffer[2048];
 >         memset(buffer, '%', sizeof(buffer));
 > 
 >   for (counter = 0; counter < 20000; counter++)
 >   {
 >         sprintf(buf, "%s/%d", argv[1], counter);
 >     x = open(buf,O_CREAT | O_WRONLY);
 >         if (x == -1) {
 >                 perror("open");
 >                 exit(1);
 >         }
 >     write(x, buffer, sizeof(buffer));
 >     close(x);
 >   }
 >   return 0;
 > }
 > 
 > mkdir a b c d e f g h
 > for i in a b c d e f g h ; do ./a.out $i & ; done
 > ~/tst % find . | wc -l
 >    74246
 > 
 > Looks like your test program has a bug.
 > 
 > Can you try to reduce it down to a reproduceable case?
 > 
 > FreeBSD xxx.wintelcom.net 4.2-STABLE FreeBSD 4.2-STABLE #0: Wed Jan 10 19:58
:03 PST 2001     bright@xxx.wintelcom.net:/usr/obj/usr/src/sys/xxx  i386
 > 
 > ~/tst % find . | wc -l
 >    99470
 > 
 > :)
 > 
 > -- 
 > -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]
 > "I have the heart of a child; I keep it in a jar on my desk."
 > 


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