From owner-freebsd-hackers  Thu Aug 12  0:26: 2 1999
Delivered-To: freebsd-hackers@freebsd.org
Received: from oleg.sani-c.vrn.ru (oleg.sani-c.vrn.ru [195.98.74.83])
	by hub.freebsd.org (Postfix) with ESMTP id D5F3014D43
	for <freebsd-hackers@freebsd.org>; Thu, 12 Aug 1999 00:25:37 -0700 (PDT)
	(envelope-from oleg@oleg.sani-c.vrn.ru)
Received: from localhost (oleg@localhost)
	by oleg.sani-c.vrn.ru (8.9.2/8.9.2) with ESMTP id LAA00355
	for <freebsd-hackers@freebsd.org>; Thu, 12 Aug 1999 11:25:38 +0400 (MSD)
	(envelope-from oleg@oleg.sani-c.vrn.ru)
Date: Thu, 12 Aug 1999 11:25:37 +0400 (MSD)
From: Oleg Derevenetz <oleg@oleg.sani-c.vrn.ru>
To: freebsd-hackers@freebsd.org
Subject: mmap bug
Message-ID: <Pine.BSF.4.05.9908121122210.347-100000@oleg.sani-c.vrn.ru>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG


Oh, I'm sorry, I made a mistake when posting code. I posted incorrectly
patched version... This version correct :

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>

main(int argc, char *argv[])
{
    int fd;
    int i;
    int len=1024*1024*10;  /*ie 10Mbytes*/
    caddr_t addr;
    char ttt[80];
    int bunlink=0;

    if (argc>1 && strcmp (argv[1], "-u")==0)
       bunlink=1;

    for (i=0;;i++)
    {
	sprintf (ttt,"%d",i);
	printf ("mmapping %ld byte region on file %s\n", len, ttt);
	fd=open(ttt,O_CREAT|O_RDWR,0666);
	if (fd<0)
	{
	    printf("open error %ld\n",errno);
	    exit(1);
	}
	lseek(fd,len-1,SEEK_SET);
	write(fd,"",1);
	addr=mmap(0,len,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
	if (addr==MAP_FAILED)
	{
	    printf("mmap error %ld",errno);
	    exit(1);
	}
	memset(addr,'x',len);
	if ( munmap(addr, len) != 0 )
	{
    	    fprintf(stderr, "munmap failed\n");
    	    exit(EXIT_FAILURE);
	}
	close(fd);
	if ( bunlink ) unlink (ttt);
    }
}

Thank you for answers.



To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message