Hi,
I create a file on tmpfs, and it read/write works fine. However, it cannot
mmap, and returns EINVAL.
I found the reason is that dataspace of the file is not valid.
L4::Cap<L4Re::Dataspace> fds = fi->data_space()
if (!fds.is_valid())
{
return -EINVAL;
}
How to make it valid? Is there another method to do file mapping?
Here is an example code snippet:
==========================
const char* filename = "/tmp/testfile";
ret = mount("/", "tmp", "tmpfs", 0, 0);
fd = open(filename, O_RDWR|O_CREAT);
write 10K data into file
addr = mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); //return
-1, and errno is EINVAL
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