01-16-2014
Another update, with more bugfixes, some code simplifications, and a --help option. I'm keeping the most up-to-date code in the OP now.
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LEARN ABOUT OPENSOLARIS
ks_update
ks_update(9E) Driver Entry Points ks_update(9E)
NAME
ks_update - dynamically update kstats
SYNOPSIS
#include <sys/types.h>
#include <sys/kstat.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
int prefix_ks_update(kstat_t *ksp, int rw);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI)
PARAMETERS
ksp Pointer to a kstat(9S) structure.
rw Read/Write flag. Possible values are
KSTAT_READ Update kstat structure statistics from the driver.
KSTAT_WRITE Update driver statistics from the kstat structure.
DESCRIPTION
The kstat mechanism allows for an optional ks_update() function to update kstat data. This is useful for drivers where the underlying
device keeps cheap hardware statistics, but extraction is expensive. Instead of constantly keeping the kstat data section up to date, the
driver can supply a ks_update() function which updates the kstat's data section on demand. To take advantage of this feature, set the
ks_update field before calling kstat_install(9F).
The ks_update() function must have the following structure:
static int
xx_kstat_update(kstat_t *ksp, int rw)
{
if (rw == KSTAT_WRITE) {
/* update the native stats from ksp->ks_data */
/* return EACCES if you don't support this */
} else {
/* update ksp->ks_data from the native stats */
}
return(0);
}
In general, the ks_update() routine may need to refer to provider-private data; for example, it may need a pointer to the provider's raw
statistics. The ks_private field is available for this purpose. Its use is entirely at the provider's discretion.
No kstat locking should be done inside the ks_update() routine. The caller will already be holding the kstat's ks_lock (to ensure consis-
tent data) and will prevent the kstat from being removed.
RETURN VALUES
ks_update() should return
0 For success.
EACCES If KSTAT_WRITE is not allowed.
EIO For any other error.
SEE ALSO
kstat_create(9F), kstat_install(9F), kstat(9S)
Writing Device Drivers
SunOS 5.11 27 May 1994 ks_update(9E)