1libnbd-ocaml(3)                     LIBNBD                     libnbd-ocaml(3)
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3
4

NAME

6       libnbd-ocaml - how to use libnbd from OCaml
7

SYNOPSIS

9        let nbd = NBD.create () in
10        NBD.connect_uri nbd "nbd://localhost";
11        let size = NBD.get_size nbd in
12        printf "%Ld\n" size;
13        NBD.close ()
14
15       Alternate syntax which ensures that close is called even if an
16       exception is thrown:
17
18        let size =
19          NBD.with_handle (
20            fun nbd ->
21              NBD.connect_uri nbd "nbd://localhost";
22              NBD.get_size nbd
23          ) in
24        printf "%Ld\n" size
25
26       To compile:
27
28        ocamlopt -I +nbd mlnbd.cmxa prog.ml -o prog
29
30       or using findlib:
31
32        ocamlfind opt -package nbd -linkpkg prog.ml -o prog
33

DESCRIPTION

35       This manual page documents how to use libnbd to access Network Block
36       Device (NBD) servers from the OCaml programming language.
37
38       The OCaml bindings work very similarly to the C bindings so you should
39       start by reading libnbd(3).
40
41       For OCaml API documentation see NBD(3).
42

HANDLES

44       Create a libnbd handle of type "NBD.t" by calling "NBD.create ()".
45
46       You can either close the handle explicitly by calling "NBD.close" or it
47       will be closed automatically when it is garbage collected.  If you call
48       any other method on a handle which you have explicitly closed then the
49       API will throw an "NBD.Closed" exception.
50
51       "NBD.with_handle" can be used to make sure the handle is closed in a
52       timely manner.  See the example in the "SYNOPSIS" above.
53

ERRORS

55       Libnbd errors are turned automatically into exceptions of type:
56
57        NBD.Error (str, Unix.error option)
58
59       The first exception parameter is a string which is the printable error
60       message.  The second is the OCaml "Unix.error" code, if available (see
61       nbd_get_errno(3)).
62
63   Callbacks with "int ref" error parameter
64       Some callbacks take an error parameter of type "int ref", corresponding
65       to the "int *error" passed to those callbacks in C.  See also:
66       "Callbacks with "int *error" parameter" in libnbd(3)
67
68       If an error occurs during the callback you can update the "int" in the
69       reference, setting it to a C-compatible errno.  To convert an OCaml
70       "Unix.error" into a C-compatible errno call "NBD.errno_of_unix_error".
71

EXAMPLES

73       This directory contains examples written in OCaml:
74
75       https://gitlab.com/nbdkit/libnbd/tree/master/ocaml/examples
76

SEE ALSO

78       libnbd(3), NBD(3).
79

AUTHORS

81       Richard W.M. Jones
82

84       Copyright Red Hat
85

LICENSE

87       This library is free software; you can redistribute it and/or modify it
88       under the terms of the GNU Lesser General Public License as published
89       by the Free Software Foundation; either version 2 of the License, or
90       (at your option) any later version.
91
92       This library is distributed in the hope that it will be useful, but
93       WITHOUT ANY WARRANTY; without even the implied warranty of
94       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
95       Lesser General Public License for more details.
96
97       You should have received a copy of the GNU Lesser General Public
98       License along with this library; if not, write to the Free Software
99       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
100       02110-1301 USA
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104libnbd-1.18.1                     2023-10-31                   libnbd-ocaml(3)
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