man/man3nvpair/nvlist_lookup_nvpair.3nvpair

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 NVLIST_LOOKUP_NVPAIR 3NVPAIR "Mar 13, 2016"
 NAME
nvlist_lookup_nvpair, nvlist_exists, nvlist_empty - lookup named pairs
 SYNOPSIS

cc [ flag... ] file... -lnvpair [ library... ]
#include <libnvpair.h>

int nvlist_lookup_nvpair(nvlist_t *nvl, const char *name,
 nvpair_t **nvp);


boolean_t nvlist_exists(nvlist_t *nvl, const char *name);


boolean_t nvlist_empty(nvlist_t *nvl);


 DESCRIPTION

The nvlist_lookup_nvpair() function returns the nvpair with the matching
name, regardless of type. It is valid only for lists allocated with
NV_UNIQUE_NAME. See nvlist_alloc(3NVPAIR).

The nvlist_exists() function returns success if any nvpair exists with
the given name. It is valid for all types of lists.

The nvlist_empty() function returns success if the list nvl
contains no nvpairs. It is valid for all types of lists.
 RETURN VALUES

The nvlist_lookup_nvpair() function returns 0 on success and an error
value on failure.

The nvlist_exists() function returns B_TRUE if an nvpair with the
given name exists and B_FALSE otherwise.

The nvlist_empty() function returns B_TRUE if the given
list, nvl, contains no nvpairs and B_FALSE otherwise.
 ERRORS

The nvlist_lookup_nvpair() function will fail if:
EINVAL

There is an invalid argument.


ENOENT

No matching name-value pair is found.


ENOTSUP

The list was not allocated with NV_UNIQUE_NAME.


 ATTRIBUTES

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


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


 SEE ALSO

 libnvpair (3LIB),  nvlist_alloc (3NVPAIR),  attributes (7),  nvlist_lookup_nvpair (9F)