NVLIST_NEXT_NVPAIR(3NVPAIR) Name-value Pair Library Functions NVLIST_NEXT_NVPAIR(3NVPAIR)

nvlist_next_nvpair, nvpair_name, nvpair_type - return data regarding name-value pairs

cc [ flag... ] file... -lnvpair [ library... ]
#include <libnvpair.h>
nvpair_t *nvlist_next_nvpair(nvlist_t *nvl, nvpair_t *nvpair);

char *nvpair_name(nvpair_t *nvpair);

data_type_t nvpair_type(nvpair_t *nvpair);

nvl

The nvlist_t to be processed.

nvpair

Handle to a name-value pair.

The nvlist_next_nvpair() function returns a handle to the next nvpair in the list following nvpair. If nvpair is NULL, the first pair is returned. If nvpair is the last pair in the nvlist, NULL is returned.

The nvpair_name() function returns a string containing the name of nvpair.

The nvpair_type() function retrieves the value of the nvpair in the form of enumerated type data_type_t. This is used to determine the appropriate nvpair_*() function to call for retrieving the value.

Upon successful completion, nvpair_name() returns a string containing the name of the name-value pair.

Upon successful completion, nvpair_type() returns an enumerated data type data_type_t. Possible values for data_type_t are as follows:

DATA_TYPE_BOOLEAN
DATA_TYPE_BOOLEAN_VALUE
DATA_TYPE_BYTE
DATA_TYPE_INT8
DATA_TYPE_UINT8
DATA_TYPE_INT16
DATA_TYPE_UINT16
DATA_TYPE_INT32
DATA_TYPE_UINT32
DATA_TYPE_INT64
DATA_TYPE_UINT64
DATA_TYPE_STRING
DATA_TYPE_NVLIST
DATA_TYPE_BOOLEAN_ARRAY
DATA_TYPE_BYTE_ARRAY
DATA_TYPE_INT8_ARRAY
DATA_TYPE_UINT8_ARRAY
DATA_TYPE_INT16_ARRAY
DATA_TYPE_UINT16_ARRAY
DATA_TYPE_INT32_ARRAY
DATA_TYPE_UINT32_ARRAY
DATA_TYPE_INT64_ARRAY
DATA_TYPE_UINT64_ARRAY
DATA_TYPE_STRING_ARRAY
DATA_TYPE_NVLIST_ARRAY

Upon reaching the end of a list, nvlist_next_pair() returns NULL. Otherwise, the function returns a handle to next nvpair in the list.

These and other libnvpair(3LIB) functions cannot manipulate nvpairs after they have been removed from or replaced in an nvlist. Replacement can occur during pair additions to nvlists created with NV_UNIQUE_NAME_TYPE and NV_UNIQUE_NAME. See nvlist_alloc(3NVPAIR).

No errors are defined.

Example 1 Example of usage of nvlist_next_nvpair().


/*


 * usage of nvlist_next_nvpair()


 */


 static int


 edit_nvl(nvlist_t *nvl)


 {


     nvpair_t *curr = nvlist_next_nvpair(nvl, NULL);


     while (curr != NULL) {


         int err;


        nvpair_t *next = nvlist_next_nvpair(nvl, curr);


        if (!nvl_check(curr))


            if ((err = nvlist_remove(nvl, nvpair_name(curr),


                nvpair_type(curr))) != 0)


                    return (err);


         curr = next;


     }


    return (0);


 }

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE
Interface Stability Evolving
MT-Level MT-Safe

libnvpair(3LIB), nvlist_alloc(3NVPAIR), attributes(7)

The enumerated nvpair data types might not be an exhaustive list and new data types can be added. An application using the data type enumeration, data_type_t, should be written to expect or ignore new data types.

February 2, 2004 OmniOS