mcast_set_loop.lc

来自「unix网络编程卷1：套接口API的全书源码」· LC 代码 · 共 39 行

/* include mcast_set_loop */
#include    "unp.h"##  1 ##src/lib/mcast_set_loop.c##

int##  2 ##src/lib/mcast_set_loop.c##
mcast_set_loop(int sockfd, int onoff)##  3 ##src/lib/mcast_set_loop.c##
{##  4 ##src/lib/mcast_set_loop.c##
    switch (sockfd_to_family(sockfd)) {##  5 ##src/lib/mcast_set_loop.c##
    case AF_INET:{##  6 ##src/lib/mcast_set_loop.c##
            u_char  flag;##  7 ##src/lib/mcast_set_loop.c##

            flag = onoff;##  8 ##src/lib/mcast_set_loop.c##
            return (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_LOOP,##  9 ##src/lib/mcast_set_loop.c##
                               &flag, sizeof(flag)));## 10 ##src/lib/mcast_set_loop.c##
        }## 11 ##src/lib/mcast_set_loop.c##

#ifdef  IPV6## 12 ##src/lib/mcast_set_loop.c##
    case AF_INET6:{## 13 ##src/lib/mcast_set_loop.c##
            u_int   flag;## 14 ##src/lib/mcast_set_loop.c##

            flag = onoff;## 15 ##src/lib/mcast_set_loop.c##
            return (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,## 16 ##src/lib/mcast_set_loop.c##
                               &flag, sizeof(flag)));## 17 ##src/lib/mcast_set_loop.c##
        }## 18 ##src/lib/mcast_set_loop.c##
#endif## 19 ##src/lib/mcast_set_loop.c##

    default:## 20 ##src/lib/mcast_set_loop.c##
        errno = EPROTONOSUPPORT;## 21 ##src/lib/mcast_set_loop.c##
        return (-1);## 22 ##src/lib/mcast_set_loop.c##
    }## 23 ##src/lib/mcast_set_loop.c##
}## 24 ##src/lib/mcast_set_loop.c##
/* end mcast_set_loop */

void## 25 ##src/lib/mcast_set_loop.c##
Mcast_set_loop(int sockfd, int onoff)## 26 ##src/lib/mcast_set_loop.c##
{## 27 ##src/lib/mcast_set_loop.c##
    if (mcast_set_loop(sockfd, onoff) < 0)## 28 ##src/lib/mcast_set_loop.c##
        err_sys("mcast_set_loop error");## 29 ##src/lib/mcast_set_loop.c##
}## 30 ##src/lib/mcast_set_loop.c##