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kstat_chain_update(3kstat)
Kernel Statistics Library Functions
kstat_chain_update(3KSTAT)
NAME
kstat_chain_update - update the kstat header chain
SYNOPSIS
cc [ flag... ] file... -lkstat [ library...]
#include <kstat.h>
kid_t kstat_chain_update(kstat_ctl_t *kc);
DESCRIPTION
The kstat_chain_update() function brings the user's kstat header chain
in sync with that of the kernel. The kstat chain is a linked list of
kstat headers (kstat_t's) pointed to by kc->kc_chain, which is initial‐
ized by the kstat_open() function. This chain constitutes a list of all
kstats currently in the system. For more information, see the
kstat_open(3KSTAT) man page.
During normal operation, the kernel creates new kstats and delete old
ones as various device instances are added and removed, thereby causing
the user's copy of the kstat chain to become out of date. The
kstat_chain_update() function detects this condition by comparing the
kernel's current kstat chain ID (KCID), which is incremented every time
the kstat chain changes, to the user's KCID, kc->kc_chain_id. If the
KCIDs match, the kstat_chain_update() function does nothing. Otherwise,
it deletes any invalid kstat headers from the user's kstat chain, adds
any new ones, and sets kc->kc_chain_id to the new KCID. All other kstat
headers in the user's kstat chain are unmodified.
RETURN VALUES
Upon successful completion, the kstat_chain_update() function returns
the new KCID if the kstat chain has changed and 0 if it has not
changed. Otherwise, it returns −1 and sets errno to indicate the error.
ERRORS
The kstat_chain_update() function will fail if:
EAGAIN The kstat was temporarily unavailable for reading or writ‐
ing.
ENOMEM Insufficient storage space is available.
ENXIO The given kstat could not be located for reading.
EOVERFLOW The data for the given kstat was too large to be stored in
the structure.
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_chain_update() function is MT-Safe with the exception that
only one thread may actively use a kstat_ctl_t * value at any time.
Synchronization is left to the application.
SEE ALSO
kstat(3KSTAT), kstat_lookup(3KSTAT), kstat_open(3KSTAT),
kstat_read(3KSTAT), attributes(7), kstat2(3KSTAT2),
kstat2_update(3KSTAT2)
NOTES
The kstat_chain_update() function is deprecated. It may be removed in a
future release of Oracle Solaris. For more information, see the
kstat2(3KSTAT2) man page.
Oracle Solaris 11.4 31 Aug 2016
kstat_chain_update(3KSTAT)