IP_MULTICAST_IF2const
Local device for a multicast socket
Usage
#include <netinet/in.h> /* Definition of IP* constants */ #include <sys/socket.h>
int setsockopt(int sockfd, IPPROTO_IP, IP_MULTICAST_IF, const void val[size], size_t size); int getsockopt(int sockfd, IPPROTO_IP, IP_MULTICAST_IF, struct in_addr *val, sizeof(struct in_addr));
Library
Standard C library (libc, -lc)
Overview
Set the local device for a multicast socket.
The argument for setsockopt(2) is an ip_mreqn(2type) or (since Linux 3.5) ip_mreq(2type) structure, or an in_addr(2type) structure. (The kernel determines which structure is being passed based on the size passed in size.)
Errors
See IPPROTO_IP(2const). See setsockopt(2). See ip(7).