kstat_named(9s) [opensolaris man page]

kstat_named(9S) 					    Data Structures for Drivers 					   kstat_named(9S)

NAME

       kstat_named - structure for named kstats

SYNOPSIS

       #include <sys/types.h>
       #include <sys/kstat.h>
       #include <sys/ddi.h>
       #include <sys/sunddi.h>

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI)

DESCRIPTION

       Named  kstats  are  an  array of name-value pairs. These pairs are kept in the kstat_named structure. When a kstat is created by kstat_cre-
       ate(9F), the driver specifies how many of these structures will be allocated. The structures are returned as an array  pointed  to  by  the
       ks_data field.

STRUCTURE MEMBERS

	 union {
		   char 		  c[16];
		   long 		  l;
		   ulong_t		  ul;
		   longlong_t		  ll;
		   u_longlong_t 	  ull;
	 } value;  /* value of counter */

       The  only member exposed to drivers is the value member. This field is a union of several data types. The driver must specify which type it
       will use in the call to kstat_named_init().

SEE ALSO

       kstat_create(9F), kstat_named_init(9F)

       Writing Device Drivers

SunOS 5.11							    4 Apr 1994							   kstat_named(9S)

kstat_io(9S)						    Data Structures for Drivers 					      kstat_io(9S)

NAME

       kstat_io - structure for I/O kstats

SYNOPSIS

       #include <sys/types.h>
       #include <sys/kstat.h>
       #include <sys/ddi.h>
       #include <sys/sunddi.h>

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI)

DESCRIPTION

       I/O kstat statistics are kept in a kstat_io structure. When kstat_create(9F) creates an I/O kstat, the ks_data field is a pointer to one of
       these structures. The macro KSTAT_IO_PTR() is provided to retrieve this field. It looks like this:

       #define KSTAT_IO_PTR(kptr)    ((kstat_io_t *)(kptr)->ks_data)

STRUCTURE MEMBERS

       u_longlong_t	 nread;      /* number of bytes read */
       u_longlong_t	 nwritten;   /* number of bytes written *]/
       ulong_t		 reads;      /* number of read operations */
       ulong_t		 writes;     /* number of write operations */

       The nread field should be updated by the driver with the number of bytes successfully read upon completion.

       The nwritten field should be updated by the driver with the number of bytes successfully written upon completion.

       The reads field should be updated by the driver after each successful read operation.

       The writes field should be updated by the driver after each successful write operation.

       Other I/O statistics are updated through the use of the kstat_queue(9F) functions.

SEE ALSO

       kstat_create(9F),   kstat_named_init(9F),   kstat_queue(9F),   kstat_runq_back_to_waitq(9F),   kstat_runq_enter(9F),   kstat_runq_exit(9F),
       kstat_waitq_enter(9F), kstat_waitq_exit(9F), kstat_waitq_to_runq(9F)

       Writing Device Drivers

SunOS 5.10							    4 Apr 1994							      kstat_io(9S)