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.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH IP_ADD_MEMBERSHIP 2const (date) "Linux man-pages (unreleased)"
.SH NAME
IP_ADD_MEMBERSHIP
\-
join a multicast group
.SH LIBRARY
Standard C library
.RI ( libc ,\~ \-lc )
.SH SYNOPSIS
.nf
.BR "#include <netinet/in.h>" " /* Definition of " IP* " constants */"
.B #include <sys/socket.h>
.P
.BI int\~setsockopt(int\~ sockfd ,\~IPPROTO_IP,\~IP_ADD_MEMBERSHIP,
.BI " const\~struct\~ip_mreqn\~*" val ,\~sizeof(struct\~ip_mreqn));
.fi
.SH DESCRIPTION
Join a multicast group.
.P
.B IP_ADD_MEMBERSHIP
is valid only for
.BR setsockopt (2).
.SH ERRORS
See
.BR IPPROTO_IP (2const).
See
.BR setsockopt (2).
See
.BR ip (7).
.TP
.B EINVAL
.I val->imr_multiaddr
is not a valid multicast address.
.SH HISTORY
Linux 1.2.
.P
For compatibility, the old
.I ip_mreq
structure is still supported.
The kernel determines which structure is being passed based
on the size passed in the last argument.
.SH SEE ALSO
.BR IPPROTO_IP (2const),
.BR ip_mreqn (2type),
.BR setsockopt (2),
.BR ip (7)
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