| |
| Driver Entry Points | devmap_dup(9E) |
| | devmap_dup - device mapping duplication entry point |
SYNOPSIS
| |
#include <sys/ddi.h>
#include <sys/sunddi.h
int prefixdevmap_dup(devmap_cookie_t dhp, void *pvtp, devmap_cookie_t new_dhp, void **new_pvtp); |
| |
Solaris DDI specific (Solaris DDI).
|
| |
-
dhp
- An opaque mapping handle that the system uses to describe the mapping currently being duplicated.
-
pvtp
- Driver private mapping data for the mapping currently being duplicated.
-
new_dhp
- An opaque data structure that the system uses to describe the duplicated device mapping.
-
new_pvtp
- A pointer to be filled in by device drivers with the driver private mapping data for the duplicated device mapping.
|
| |
The system calls devmap_dup() when a device mapping is duplicated, such as during the execution of the fork(2) system call. The system expects devmap_dup() to generate new driver private data for the new mapping, and to set new_pvtp to point to it. new_dhp is the handle of the new mapped object.
A non-zero return value from devmap_dup() will cause a corresponding operation such as fork() to fail.
|
| |
devmap_dup() returns the following values:
-
0
- Successful completion.
- Non-zero
- An error occurred.
|
| | Example 1.
| |
| |
static int
xxdevmap_dup(devmap_cookie_t dhp, void *pvtp, devmap_cookie_t new_dhp,
void **new_pvtp)
{
struct xxpvtdata *prvtdata;
struct xxpvtdata *p = (struct xxpvtdata *)pvtp;
struct xx_softc *softc = p->softc;
mutex_enter(&softc->mutex);
/* Allocate a new private data structure */
prvtdata = kmem_alloc(sizeof (struct xxpvtdata), KM_SLEEP);
/* Return the new data */
prvtdata->off = p->off;
prvtdata->len = p->len;
prvtdata->ctx = p->ctx;
prvtdata->dhp = new_dhp;
prvtdata->softc = p->softc;
*new_pvtp = prvtdata;
mutex_exit(&softc->mutex);
return (0);
}
|
|
|
| |
