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kstat_write(3kstat)
Kernel Statistics Library Functions kstat_read(3KSTAT)
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
The kstat_read() function gets data from the kernel for the kstat
pointed to by ksp. The ksp->ks_data field is automatically allocated
(or reallocated) to be large enough to hold all of the data. The
ksp->ks_ndata field 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 to buf.
The kstat_write() function writes data from buf, or from ksp->ks_data
if buf is NULL, to the corresponding kstat in the kernel. The
{PRIV_SYS_CONFIG} privilege is required to use the kstat_write() func‐
tion.
RETURN VALUES
Upon successful completion, the kstat_read() and kstat_write() func‐
tions return the current kstat chain ID (KCID). Otherwise, they return
−1 and set errno to indicate the error.
ERRORS
The kstat_read() and kstat_write() functions will fail if:
EACCES An attempt was made to write to a non-writable kstat.
EAGAIN The kstat was temporarily unavailable for reading or writ‐
ing.
EINVAL An attempt was made to write data to a kstat, but the num‐
ber of elements or the data size does not match.
ENOMEM Insufficient storage space is available.
ENXIO The given kstat could not be located for reading or writ‐
ing.
EOVERFLOW The data for the given kstat was too large to be stored in
the structure.
EPERM An attempt was made to write to a kstat, but
{PRIV_SYS_CONFIG} was not asserted in the effective privi‐
lege set.
FILES
/dev/kstat kernel statistics driver
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityObsolete _ MT-LevelMT-Safe with
exceptions
The kstat_read() function is MT-Safe with the exception that only one
thread may actively use a kstat_ctl_t * value at any time. Synchroniza‐
tion is left to the application.
SEE ALSO
kstat(3KSTAT), kstat_chain_update(3KSTAT), kstat_lookup(3KSTAT),
kstat_open(3KSTAT), kstat2(3KSTAT2), kstat2_open(3KSTAT2),
kstat2_close(3KSTAT2), kstat2_lookup_map(3KSTAT2),
kstat2_map_get(3KSTAT2), attributes(7), privileges(7)
NOTES
The kstat_read() and kstat_write() functions are deprecated. They may
be removed in a future release of Oracle Solaris. Use the
kstat2_lookup_map() and kstat2_map_get() functions to read a statistic.
There will be no functional replacement for the kstat_write() function.
Kstats v2 does not support writing data-values into kstats. For more
information, see the kstat2_lookup_map(3KSTAT2) and
kstat2_map_get(3KSTAT2) man pages.
Oracle Solaris 11.4 3 Nov 2021 kstat_read(3KSTAT)