setsockopt(socketFD, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)); //make socket reusable code example

Example: c socket SO_REUSEADDR

if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &(int){1}, sizeof(int)) < 0)
    error("setsockopt(SO_REUSEADDR) failed");