Looks like Oleg made a mistake in posting the code. I saw an earlier version
of this in freebsd-questions and followed up with him.
I've appended the version I think he meant to include.
He's reporting this behavior with 3.2R. Runs fine with 'mmap -u', appears to
hang the machine on the second iteration (file "1") with 'mmap'.
Runs fine on Solaris 2.6 and Digital Unix 4.0D -- with the exception of
filling the disk without "-u" :^).
He's trying to ask if this is a problem with the code in question or 3.2R's
mmap.
Charles
--- mmap.c ---
#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("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);
}
}
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