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.TH socket_mcttl4 3
socket_mcttl4 \- set multicast ttl
.B #include <socket.h>
int \fBsocket_mcttl4\fP(int \fIs\fR,char \fITTL\fR);
socket_mcttl4 sets the TTL of outgoing multicast packets on the socket
\fIs\fR. Each router decrements the packet TTL by one and discards the
packet if the TTL reaches zero. Setting the TTL to 1, for example, will
limit the packet propagation to the LAN.
If something goes wrong, socket_mcttl4 returns -1, setting errno
socket_mcttl6(3), socket_mcjoin4(3), socket_mcleave4(3)