mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-05 09:14:03 +00:00
8ed7462feb
Remove the lists of unneeded header files. Requested by: eadler
115 lines
3.0 KiB
Groff
115 lines
3.0 KiB
Groff
.\" Copyright (c) 2003 Bruce M. Simpson. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY Bruce M. Simpson ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL Bruce M. Simpson BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd May 21, 2013
|
|
.Dt GETIFMADDRS 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm getifmaddrs
|
|
.Nd get multicast group memberships
|
|
.Sh SYNOPSIS
|
|
.In ifaddrs.h
|
|
.Ft int
|
|
.Fn getifmaddrs "struct ifmaddrs **ifmap"
|
|
.Ft void
|
|
.Fn freeifmaddrs "struct ifmaddrs *ifmp"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn getifmaddrs
|
|
function stores a reference to a linked list of the multicast memberships
|
|
on the local machine in the memory referenced by
|
|
.Fa ifmap .
|
|
The list consists of
|
|
.Vt ifmaddrs
|
|
structures, as defined in the include file
|
|
.In ifaddrs.h .
|
|
The
|
|
.Vt ifmaddrs
|
|
structure contains at least the following entries:
|
|
.Bd -literal
|
|
struct ifmaddrs *ifma_next; /* Pointer to next struct */
|
|
struct sockaddr *ifma_name; /* Interface name (AF_LINK) */
|
|
struct sockaddr *ifma_addr; /* Multicast address */
|
|
struct sockaddr *ifma_lladdr; /* Link-layer translation, if any */
|
|
.Ed
|
|
.Pp
|
|
The
|
|
.Va ifma_next
|
|
field contains a pointer to the next structure on the list.
|
|
This field is
|
|
.Dv NULL
|
|
in last structure on the list.
|
|
.Pp
|
|
The
|
|
.Va ifma_name
|
|
field references an
|
|
.Dv AF_LINK
|
|
address structure, containing the name of the
|
|
interface where the membership exists.
|
|
.Pp
|
|
The
|
|
.Va ifma_addr
|
|
references the address that this membership is for.
|
|
.Pp
|
|
The
|
|
.Va ifma_lladdr
|
|
field references a link-layer translation for the protocol-level address in
|
|
.Va ifma_addr ,
|
|
if one is set, otherwise it is
|
|
.Dv NULL .
|
|
.Pp
|
|
The data returned by
|
|
.Fn getifmaddrs
|
|
is dynamically allocated and should be freed using
|
|
.Fn freeifmaddrs
|
|
when no longer needed.
|
|
.Sh RETURN VALUES
|
|
.Rv -std getifmaddrs
|
|
.Sh ERRORS
|
|
The
|
|
.Fn getifmaddrs
|
|
may fail and set
|
|
.Va errno
|
|
for any of the errors specified for the library routines
|
|
.Xr malloc 3
|
|
or
|
|
.Xr sysctl 3 .
|
|
.Sh SEE ALSO
|
|
.Xr sysctl 3 ,
|
|
.Xr networking 4 ,
|
|
.Xr ifconfig 8
|
|
.Sh HISTORY
|
|
The
|
|
.Fn getifmaddrs
|
|
function first appeared in
|
|
.Fx 5.2 .
|
|
.Sh BUGS
|
|
If both
|
|
.In net/if.h
|
|
and
|
|
.In ifaddrs.h
|
|
are being included,
|
|
.In net/if.h
|
|
.Em must
|
|
be included before
|
|
.In ifaddrs.h .
|