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.\" ========================================================================
.\"
.IX Title "nbd_get_nr_meta_contexts 3"
.TH nbd_get_nr_meta_contexts 3 "2023-01-04" "libnbd-1.14.2" "LIBNBD"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
nbd_get_nr_meta_contexts \- return the current number of requested meta
contexts
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <libnbd.h>
\&
\& ssize_t nbd_get_nr_meta_contexts (struct nbd_handle *h);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
During connection libnbd can negotiate zero or more metadata
contexts with the server.  Metadata contexts are features (such
as \f(CW"base:allocation"\fR) which describe information returned
by the \fBnbd_block_status\fR\|(3) command (for \f(CW"base:allocation"\fR
this is whether blocks of data are allocated, zero or sparse).
.PP
This command returns how many meta contexts have been added to
the list to request from the server via \fBnbd_add_meta_context\fR\|(3).
The server is not obligated to honor all of the requests; to see
what it actually supports, see \fBnbd_can_meta_context\fR\|(3).
.SH "RETURN VALUE"
.IX Header "RETURN VALUE"
This call returns an integer size ≥ \f(CW0\fR.
.SH "ERRORS"
.IX Header "ERRORS"
On error \f(CW\*(C`\-1\*(C'\fR is returned.
.PP
Refer to \*(L"\s-1ERROR HANDLING\*(R"\s0 in \fBlibnbd\fR\|(3)
for how to get further details of the error.
.PP
The following parameters must not be \s-1NULL:\s0 \f(CW\*(C`h\*(C'\fR.
For more information see \*(L"Non-NULL parameters\*(R" in \fBlibnbd\fR\|(3).
.SH "VERSION"
.IX Header "VERSION"
This function first appeared in libnbd 1.6.
.PP
If you need to test if this function is available at compile time
check if the following macro is defined:
.PP
.Vb 1
\& #define LIBNBD_HAVE_NBD_GET_NR_META_CONTEXTS 1
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBnbd_add_meta_context\fR\|(3),
\&\fBnbd_block_status\fR\|(3),
\&\fBnbd_can_meta_context\fR\|(3),
\&\fBnbd_clear_meta_contexts\fR\|(3),
\&\fBnbd_create\fR\|(3),
\&\fBnbd_get_meta_context\fR\|(3),
\&\fBlibnbd\fR\|(3).
.SH "AUTHORS"
.IX Header "AUTHORS"
Eric Blake
.PP
Richard W.M. Jones
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (C) 2019\-2021 Red Hat Inc.
.SH "LICENSE"
.IX Header "LICENSE"
This library is free software; you can redistribute it and/or
modify it under the terms of the \s-1GNU\s0 Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
.PP
This library is distributed in the hope that it will be useful,
but \s-1WITHOUT ANY WARRANTY\s0; without even the implied warranty of
\&\s-1MERCHANTABILITY\s0 or \s-1FITNESS FOR A PARTICULAR PURPOSE.\s0  See the \s-1GNU\s0
Lesser General Public License for more details.
.PP
You should have received a copy of the \s-1GNU\s0 Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, \s-1MA 02110\-1301 USA\s0