05-12-2008
Sorry, the post got duplicated.
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All,
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UHDR 2008112
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David
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LEARN ABOUT SUNOS
devmap_dup
devmap_dup(9E) Driver Entry Points devmap_dup(9E)
NAME
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);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI).
ARGUMENTS
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.
DESCRIPTION
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.
RETURN VALUES
devmap_dup() returns the following values:
0 Successful completion.
Non-zero An error occurred.
EXAMPLES
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);
}
SEE ALSO
fork(2), devmap_callback_ctl(9S)
Writing Device Drivers
SunOS 5.10 21 Jan 1997 devmap_dup(9E)