kstat_read(3K)

NAME

kstat_read, kstat_write − read or write kstat data

SYNOPSIS

cc [ flag... ] file... -lkstat [ library... ]

#include <kstat.h>

kid_t kstat_read(kstat_ctl_t ∗kc, kstat_t ∗ksp, void ∗buf);

kid_t kstat_write(kstat_ctl_t ∗kc, kstat_t ∗ksp, void ∗buf);

DESCRIPTION

kstat_read() gets data from the kernel for the kstat pointed to by ksp. ksp->ks_data is automatically allocated (or reallocated) to be large enough to hold all of the data. ksp->ks_ndata is set to the number of data fields, ksp->ks_data_size is set to the total size of the data, and ksp->ks_snaptime is set to the high-resolution time at which the data snapshot was taken. If buf is non-NULL, the data is copied from ksp->ks_data into buf.

kstat_write() writes data from buf, or from ksp->ks_data if buf is NULL, to the corresponding kstat in the kernel. Only the superuser can use kstat_write().

RETURN VALUES

On success, kstat_read() and kstat_write() return the current kstat chain ID (KCID). On failure, they return −1.

FILES

/dev/kstat kernel statistics driver

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