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nvlist_lookup_string(3nvpair)
Name-value Pair Library Functions
nvlist_lookup_boolean(3NVPAIR)
NAME
nvlist_lookup_boolean, nvlist_lookup_boolean_value, nvlist_lookup_byte,
nvlist_lookup_int8, nvlist_lookup_uint8, nvlist_lookup_int16,
nvlist_lookup_uint16, nvlist_lookup_int32, nvlist_lookup_uint32,
nvlist_lookup_int64, nvlist_lookup_uint64, nvlist_lookup_double,
nvlist_lookup_string, nvlist_lookup_nvlist, nvlist_lookup_bool‐
ean_array, nvlist_lookup_byte_array, nvlist_lookup_int8_array,
nvlist_lookup_uint8_array, nvlist_lookup_int16_array,
nvlist_lookup_uint16_array, nvlist_lookup_int32_array,
nvlist_lookup_uint32_array, nvlist_lookup_int64_array,
nvlist_lookup_uint64_array, nvlist_lookup_double_array,
nvlist_lookup_nvlist_array, nvlist_lookup_string_array,
nvlist_lookup_pairs - match name and type indicated by the interface
name and retrieve data value
SYNOPSIS
cc [ flag... ] file... -lnvpair [ library... ]
#include <libnvpair.h>
int nvlist_lookup_boolean(nvlist_t *nvl, const char *name);
int nvlist_lookup_boolean_value(nvlist_t *nvl,
const char *name, boolean_t *val);
int nvlist_lookup_byte(nvlist_t *nvl, const char *name,
uchar_t *val);
int nvlist_lookup_int8(nvlist_t *nvl, const char *name,
int8_t *val);
int nvlist_lookup_uint8(nvlist_t *nvl, const char *name,
uint8_t *val);
int nvlist_lookup_int16(nvlist_t *nvl, const char *name,
int16_t *val);
int nvlist_lookup_uint16(nvlist_t *nvl, const char *name,
uint16_t *val);
int nvlist_lookup_int32(nvlist_t *nvl, const char *name,
int32_t *val);
int nvlist_lookup_uint32(nvlist_t *nvl, const char *name,
uint32_t *val);
int nvlist_lookup_int64(nvlist_t *nvl, const char *name,
int64_t *val);
int nvlist_lookup_uint64(nvlist_t *nvl, const char *name,
uint64_t *val);
int nvlist_lookup_double(nvlist_t *nvl, const char *name,
double *val);
int nvlist_lookup_string(nvlist_t *nvl, const char *name,
char **val);
int nvlist_lookup_nvlist(nvlist_t *nvl, const char *name,
nvlist_t **val);
int nvlist_lookup_boolean_array(nvlist_t *nvl, const char *name,
boolean_t **val, uint_t *nelem);
int nvlist_lookup_byte_array(nvlist_t *nvl, const char *name,
uchar_t **val, uint_t *nelem);
int nvlist_lookup_int8_array(nvlist_t *nvl, const char *name,
int8_t **val, uint_t *nelem);
int nvlist_lookup_uint8_array(nvlist_t *nvl, const char *name,
uint8_t **val, uint_t *nelem);
int nvlist_lookup_int16_array(nvlist_t *nvl, const char *name,
int16_t **val, uint_t *nelem);
int nvlist_lookup_uint16_array(nvlist_t *nvl, const char *name,
uint16_t **val, uint_t *nelem);
int nvlist_lookup_int32_array(nvlist_t *nvl, const char *name,
int32_t **val, uint_t *nelem);
int nvlist_lookup_uint32_array(nvlist_t *nvl, const char *name,
uint32_t **val, uint_t *nelem);
int nvlist_lookup_int64_array(nvlist_t *nvl, const char *name,
int64_t **val, uint_t *nelem);
int nvlist_lookup_uint64_array(nvlist_t *nvl, const char *name,
uint64_t **val, uint_t *nelem);
int nvlist_lookup_double_array(nvlist_t *nvl, const char *name,
double **val, uint_t *nelem);
int nvlist_lookup_string_array(nvlist_t *nvl, const char *name,
char ***val, uint_t *nelem);
int nvlist_lookup_nvlist_array(nvlist_t *nvl, const char *name,
nvlist_t ***val, uint_t *nelem);
int nvlist_lookup_pairs(nvlist_t *nvl, int flag...);
PARAMETERS
nvl The nvlist_t to be processed.
name Name of the name-value pair to search.
nelem Address to store the number of elements in value.
val Address to store the starting address of the value.
flag Specify bit fields defining lookup behavior:
NV_FLAG_NOENTOK The retrieval function will not fail if no
matching name-value pair is found.
DESCRIPTION
These functions find the nvpair (name-value pair) that matches the name
and type as indicated by the interface name. If one is found, nelem and
val are modified to contain the number of elements in value and the
starting address of data, respectively.
These functions work for nvlists (lists of name-value pairs) allocated
with NV_UNIQUE_NAME or NV_UNIQUE_NAME_TYPE specified in
nvlist_alloc(3NVPAIR). If this is not the case, the function returns
ENOTSUP because the list potentially contains multiple nvpairs with the
same name and type.
Multiple threads can simultaneously read the same nvlist_t but only one
thread can actively change a given nvlist_t at a time. The caller is
responsible for the synchronization.
All memory required for storing the array elements, including string
value, are managed by the library. References to such data remain valid
until nvlist_free() is called on nvl or until the element is removed
with nvlist_remove(3NVPAIR) or nvlist_remove_all(3NVPAIR).
The nvlist_lookup_pairs() function retrieves a set of nvpairs. The
arguments are a null-terminated list of pairs (data type
DATA_TYPE_BOOLEAN), triples (non-array data types) or quads (array data
types). The interpretation of the arguments depends on the value of
type (see nvpair_type(3NVPAIR)) as follows:
name Name of the name-value pair to search.
type Data type (see nvpair_type(3NVPAIR)).
val Address to store the starting address of the value. When using
data type DATA_TYPE_BOOLEAN, the val argument is omitted.
nelem Address to store the number of elements in value. Non-array
data types have only one argument and nelem is omitted.
The order of the arguments is name, type, [val], [nelem].
When using NV_FLAG_NOENTOK and no matching name-value pair is found,
the memory pointed to by val and nelem is left untouched.
RETURN VALUES
These functions return 0 on success and an error value on failure.
ERRORS
These functions will fail if:
EINVAL There is an invalid argument.
ENOENT No matching name-value pair is found
ENOTSUP An encode/decode method is not supported.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.69i) |cw(2.81i) lw(2.69i) |lw(2.81i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe
SEE ALSO
libnvpair(3LIB), nvlist_alloc(3NVPAIR), nvlist_remove(3NVPAIR),
nvpair_type(3NVPAIR), attributes(7)
Oracle Solaris 11.4 15 Apr 2019
nvlist_lookup_boolean(3NVPAIR)