'\" te
.\" Copyright (c) 2008, Sun Microsystems, Inc. All Rights Reserved.
.\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License").  You may not use this file except in compliance with the License.
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.  See the License for the specific language governing permissions and limitations under the License.
.\" When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE.  If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
.TH NVLIST_LOOKUP_BOOLEAN 3NVPAIR "September 12, 2020"
.SH 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_boolean_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_nvlist_array, nvlist_lookup_string_array, nvlist_lookup_pairs \-
match name and type indicated by the interface name and retrieve data value
.SH SYNOPSIS
.nf
\fBcc\fR [ \fIflag\fR... ] \fIfile\fR... \fB-lnvpair\fR [ \fIlibrary\fR... ]
#include <libnvpair.h>

\fBint\fR \fBnvlist_lookup_boolean\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_boolean_value\fR(\fBnvlist_t *\fR\fInvl\fR,
     \fBconst char *\fR\fIname\fR, \fBboolean_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_byte\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuchar_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int8\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint8_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint8\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint8_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int16\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint16_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint16\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint16_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int32\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint32_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint32\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint32_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int64\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint64_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint64\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint64_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_double\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBdouble *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_string\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBchar **\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_nvlist\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBnvlist_t **\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_boolean_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBboolean_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_byte_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuchar_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int8_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint8_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint8_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint8_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int16_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint16_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint16_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint16_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int32_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint32_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint32_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint32_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int64_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint64_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint64_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint64_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_string_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBchar ***\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_nvlist_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBnvlist_t ***\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_pairs\fR(\fBnvlist_t *\fR\fInvl\fR, \fBint\fR \fIflag\fR...);
.fi

.SH PARAMETERS
.ne 2
.na
\fB\fInvl\fR\fR
.ad
.RS 9n
The \fBnvlist_t\fR to be processed.
.RE

.sp
.ne 2
.na
\fB\fIname\fR\fR
.ad
.RS 9n
Name of the name-value pair to search.
.RE

.sp
.ne 2
.na
\fB\fInelem\fR\fR
.ad
.RS 9n
Address to store the number of elements in value.
.RE

.sp
.ne 2
.na
\fB\fIval\fR\fR
.ad
.RS 9n
Address to store the starting address of the value.
.RE

.sp
.ne 2
.na
\fB\fIflag\fR\fR
.ad
.RS 9n
Specify bit fields defining lookup behavior:
.sp
.ne 2
.na
\fB\fBNV_FLAG_NOENTOK\fR\fR
.ad
.RS 19n
The retrieval function will not fail if no matching name-value pair is found.
.RE

.RE

.SH DESCRIPTION
These functions find the \fBnvpair\fR (name-value pair) that matches the name
and type as indicated by the interface name. If one is found, \fInelem\fR and
\fIval\fR are modified to contain the number of elements in value and the
starting address of data, respectively.
.sp
.LP
These functions work for nvlists (lists of name-value pairs) allocated with
\fBNV_UNIQUE_NAME\fR or \fBNV_UNIQUE_NAME_TYPE\fR specified in
\fBnvlist_alloc\fR(3NVPAIR). If this is not the case, the function returns
\fBENOTSUP\fR because the list potentially contains multiple \fBnvpair\fRs with
the same name and type.
.sp
.LP
Multiple threads can simultaneously read the same \fBnvlist_t\fR but only one
thread can actively change a given \fBnvlist_t\fR at a time. The caller is
responsible for the synchronization.
.sp
.LP
All memory required for storing the array elements, including string value, are
managed by the library. References to such data remain valid until
\fBnvlist_free()\fR is called on \fInvl\fR.
.sp
.LP
The \fBnvlist_lookup_pairs()\fR function retrieves a set of nvpairs. The
arguments are a null-terminated list of pairs (data type
\fBDATA_TYPE_BOOLEAN\fR), triples (non-array data types) or quads (array data
types). The interpretation of the arguments depends on the value of \fItype\fR
(see \fBnvpair_type\fR(3NVPAIR)) as follows:
.sp
.ne 2
.na
\fB\fIname\fR\fR
.ad
.RS 9n
Name of the name-value pair to search.
.RE

.sp
.ne 2
.na
\fB\fItype\fR\fR
.ad
.RS 9n
Data type (see \fBnvpair_type\fR(3NVPAIR)).
.RE

.sp
.ne 2
.na
\fB\fIval\fR\fR
.ad
.RS 9n
Address to store the starting address of the value. When using data type
\fBDATA_TYPE_BOOLEAN\fR, the \fIval\fR argument is omitted.
.RE

.sp
.ne 2
.na
\fB\fInelem\fR\fR
.ad
.RS 9n
Address to store the number of elements in value. Non-array data types have
only one argument and \fInelem\fR is omitted.
.RE

.sp
.LP
The order of the arguments is \fIname\fR, \fItype\fR, [\fIval\fR],
[\fInelem\fR].
.sp
.LP
When using \fBNV_FLAG_NOENTOK\fR and no matching name-value pair is found, the
memory pointed to by \fIval\fR and \fInelem\fR is left untouched.
.SH RETURN VALUES
These functions return 0 on success and an error value on failure.
.SH ERRORS
These functions will fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 11n
There is an invalid argument.
.RE

.sp
.ne 2
.na
\fB\fBENOENT\fR\fR
.ad
.RS 11n
No matching name-value pair is found.
.RE

.sp
.ne 2
.na
\fB\fBENOTSUP\fR\fR
.ad
.RS 11n
An encode/decode method is not supported.
.RE

.SH ATTRIBUTES
See \fBattributes\fR(7)  for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
_
MT-Level	MT-Safe
.TE

.SH SEE ALSO
.BR libnvpair (3LIB),
.BR nvlist_alloc (3NVPAIR),
.BR nvpair_type (3NVPAIR),
.BR attributes (7)