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我尝试使用setsockopt函数向接口的多播地址列表添加一个地址,但使用errno EINVAL失败。我把一些的printk在内核代码和它看起来像错误号最终被内核packet_setsockopt功能,因为通过了optlen值小于packet_mreq结构的大小设置。对于我的生活,我无法弄清楚为什么会发生这种情况。下面是相关代码:setsockopt为什么返回EINVAL?
您的括号int addMulticastAddress(int ifindex, unsigned char macaddr[6]) {
struct packet_mreq mreq;
int fd;
int ret = -1;
if ((fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0) {
return -1;
}
memset(&mreq, 0, sizeof(struct packet_mreq));
mreq.mr_ifindex = ifindex;
mreq.mr_type = PACKET_MR_MULTICAST;
memcpy(mreq.mr_address, macaddr, 6);
mreq.mr_alen = 6;
if (setsockopt(fd, SOL_PACKET,
PACKET_ADD_MEMBERSHIP,
&mreq, sizeof(struct packet_mreq) < 0)) {
virReportSystemError(errno,
_("Failed to %s %s %s multicast list for '%s' interface"),
add ? "add" : "delete",
virMacAddrFormat(macaddr, macstr),
add ? "to" : "from", ifname);
goto cleanup;
}
ret = 0;
cleanup:
close(fd);
return ret;
}
谢谢,大有赶超!你救了我几根头发。 – 2014-09-03 12:31:26