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>
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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.
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