'\" te
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.\" Copyright 2016 Joyent, Inc.
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.TH NVLIST_LOOKUP_NVPAIR 3NVPAIR "Mar 13, 2016"
.SH NAME
nvlist_lookup_nvpair, nvlist_exists, nvlist_empty \- lookup named pairs
.SH SYNOPSIS
.LP
.nf
\fBcc\fR [ \fIflag\fR... ] \fIfile\fR... -\fBlnvpair\fR [ \fIlibrary\fR... ]
#include <libnvpair.h>

\fBint\fR \fBnvlist_lookup_nvpair\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     nvpair_t **\fInvp\fR);
.fi

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

.LP
.nf
\fBboolean_t\fR \fBnvlist_empty\fR(\fBnvlist_t *\fR\fInvl\fR);
.fi

.SH DESCRIPTION
.LP
The \fBnvlist_lookup_nvpair()\fR function returns the nvpair with the matching
name, regardless of type. It is valid only for lists allocated with
\fBNV_UNIQUE_NAME\fR. See \fBnvlist_alloc\fR(3NVPAIR).
.sp
.LP
The \fBnvlist_exists()\fR function returns success if any nvpair exists with
the given name. It is valid for all types of lists.
.sp
.LP
The \fBnvlist_empty()\fR function returns success if the list \fInvl\fR
contains no nvpairs. It is valid for all types of lists.
.SH RETURN VALUES
.LP
The \fBnvlist_lookup_nvpair()\fR function returns 0 on success and an error
value on failure.
.sp
.LP
The \fBnvlist_exists()\fR function returns \fBB_TRUE\fR if an nvpair with the
given name exists and \fBB_FALSE\fR otherwise.
.sp
.LP
The \fBnvlist_empty()\fR function returns \fBB_TRUE\fR if the given
list, \fInvl\fR, contains no nvpairs and \fBB_FALSE\fR otherwise.
.SH ERRORS
.LP
The \fBnvlist_lookup_nvpair()\fR function 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
The list was not allocated with \fBNV_UNIQUE_NAME\fR.
.RE

.SH ATTRIBUTES
.LP
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
.LP
.BR libnvpair (3LIB),
.BR nvlist_alloc (3NVPAIR),
.BR attributes (7),
.BR nvlist_lookup_nvpair (9F)