DragonFly bugs List (threaded) for 2005-07
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mmap and msdos
Set FILEPATH to a path in a msdos fs, run the program and watch it crash
in the assert. It won't crash if the msync call is removed. I guess this
is a bug in our msdos code.
Happy hacking!
-Richard
Start of program:
#include <sys/types.h>
#include <sys/mman.h>
#include <assert.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#define FILEPATH "/mnt/foo"
int
main(void)
{
int i;
int fd;
char *m;
fd = open(FILEPATH, O_CREAT|O_RDWR, 0660);
if (fd < 0)
err(1, "open");
if (ftruncate(fd, 200) != 0)
err(1, "ftruncate");
m = mmap(0, 200, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (m == MAP_FAILED)
err(1, "mmap");
if (close(fd) == -1)
err(1, "close");
for (i = 0; i < 200; i++)
m[i] = 'b';
if (msync(m, 200, MS_SYNC) != 0)
err(1, "msync");
for (i = 0; i < 200; i++)
assert(m[i] == 'b');
if (munmap(m, 200) != 0)
err(1, "munmap");
return 0;
}
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