Hi Neal,
--- "Neal H. Walfield" <[EMAIL PROTECTED]> wrote:
> My impression is that the fourth argument to
> device_open is a send
> right to the device...
... of type device_t.
> ... which is supplied as the first argument to
> device_read et al.
of type device_t. I checked include/device/device.defs
and it mentions device_t.
> Also, make sure that you add your lprread function
> to the lpr device
> structure (i.e. along side lpropen).
This I did. :)
So, this is what I have now in test.c on hurd:
static device_t lpr_dev;
device_t device_master;
error_t err;
unsigned long result;
err = get_privileged_ports (0, &device_master);
err = device_open (device_master, D_READ | D_WRITE,
"lpr", &lpr_dev);
mach_msg_type_number_t data_cnt = sizeof (result);
err = device_read (lpr_dev, 0, -1, sizeof (result),
(void *) &result, &data_cnt);
On i386/i386at/lpr.c in gnumach-1-branch, I have
lprread(dev, ior)
int dev;
io_req_t ior;
{
register int err;
unsigned long data = 0x5a5a;
printf("lpr.c: lprread()...\n");
/*
err = device_read_alloc (ior, (vm_size_t)
ior->io_count);
if (err != KERN_SUCCESS)
return (err);
*/
ior->io_data = data;
ior->io_residual = ior->io_count - sizeof (data);
return (D_SUCCESS);
}
On executing test with re-compiled driver, the "lpr.c:
lprread()" gets printed, and then I get:
panic: pmap_remove: null pv_list!
and then it reboots. Even if I tried to uncomment the
lines in lprread for device_read_alloc, the same panic
occurs.
Any suggestions on what is wrong?
OR
Is it possible for you to give me a simple example
wherein you send an unsigned long variable's address
through device_read on hurd, and its value gets
assigned in lprread in gnumach-1-branch and returned?
Thanks for your help,
SK
------------------------------------------------------------
Shakthi Kannan, MS
Software Engineer, Specsoft (Hexaware Technologies)
[E]: [EMAIL PROTECTED] [M]: (91) 98407-87007
[W]: http://www.shakthimaan.com [L]: Chennai, India
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