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fix some strncpy warnings when build with gcc8
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@@ -46,7 +46,7 @@ static void device_up(std::string dev)
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memset(&ifr, 0, sizeof ifr);
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strncpy(ifr.ifr_name, dev.c_str(), IFNAMSIZ);
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strncpy(ifr.ifr_name, dev.c_str(), IFNAMSIZ-1);
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if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0)
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perror("SIOCGIFFLAGS");
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