246 static int sIpFd      = -1; ///< Used to manage IPv6 stack on Thread interface.  variable
511     assert(sIpFd >= 0);  in UpdateUnicast()
537         rval = ioctl(sIpFd, aIsAdded ? SIOCAIFADDR_IN6 : SIOCDIFADDR_IN6, &ifr6);  in UpdateUnicast()
562     VerifyOrExit(sIpFd >= 0);  in UpdateMulticast()
566 …err = setsockopt(sIpFd, IPPROTO_IPV6, (aIsAdded ? IPV6_JOIN_GROUP : IPV6_LEAVE_GROUP), &mreq, size…  in UpdateMulticast()
607     VerifyOrExit(sIpFd >= 0);  in SetLinkState()
610     VerifyOrExit(ioctl(sIpFd, SIOCGIFFLAGS, &ifr) == 0, perror("ioctl"); error = OT_ERROR_FAILED);  in SetLinkState()
620 …     VerifyOrExit(ioctl(sIpFd, SIOCSIFFLAGS, &ifr) == 0, perror("ioctl"); error = OT_ERROR_FAILED);  in SetLinkState()
1602                         err = ioctl(sIpFd, SIOCDIFADDR_IN6, &ifr6);  in processNetifAddrEvent()
2058     VerifyOrDie(ioctl(sIpFd, SIOCSIFMTU, static_cast<void *>(&ifr)) == 0, OT_EXIT_ERROR_ERRNO);
2104     VerifyOrExit(ioctl(sIpFd, SIOCIFDESTROY, &ifr) == 0, perror("ioctl"); error = OT_ERROR_FAILED);
2222     sIpFd = SocketWithCloseExec(AF_INET6, SOCK_DGRAM, IPPROTO_IP, kSocketNonBlock);
2223     VerifyOrDie(sIpFd >= 0, OT_EXIT_ERROR_ERRNO);
2298     if (sIpFd != -1)
2300         close(sIpFd);
2301         sIpFd = -1;
2328     assert(sIpFd >= 0);