Plan 9 from Bell Labs’s /usr/web/sources/contrib/anothy/src/lib/djb-ape/unix/socket_mcttl6.c

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Distributed under the MIT License.
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#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "socket.h"
#include "byte.h"
#include "haveip6.h"
#include "ip6.h"

#ifndef IPV6_MULTICAST_HOPS
#undef LIBC_HAS_IP6
#endif

int socket_mcttl6(int s,char TTL)
{
#ifdef LIBC_HAS_IP6
  return setsockopt(s,IPPROTO_IPV6,IPV6_MULTICAST_HOPS,&TTL,sizeof TTL);
#else
  return socket_mcttl4(s,TTL);
#endif
}

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