Date: Wed, 11 Aug 1999 20:48:08 +0400 (MSD) From: Oleg Derevenetz <oleg@oleg.sani-c.vrn.ru> To: freebsd-hackers@freebsd.org Subject: mmap bug Message-ID: <199908111648.UAA01527@oleg.sani-c.vrn.ru>
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This small program, running as 'mmap', not 'mmap -u', can hang my machine.
Is this a known bug in FreeBSD's kernel, or it is my fantasy ?
Thank you for answer.
#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;
}
printf("unlink files? %s\n", bunlink ? "YES" : "NO");
for (i=0;;i++)
{
sprintf (ttt,"%d",i);
printf("mmaping %ld byte region on file %s\n", len, ttt);
fd=open(ttt,O_CREAT|O_RDWR,0666);
if (fd<0)
{
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);
}
}
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