{"id":253785,"date":"2026-07-13T03:03:36","date_gmt":"2026-07-13T00:03:36","guid":{"rendered":"https:\/\/1kitap1.com\/en\/beejs-guide-to-network-programming-brian-hall\/"},"modified":"2026-07-13T03:03:36","modified_gmt":"2026-07-13T00:03:36","slug":"beejs-guide-to-network-programming-brian-hall","status":"publish","type":"post","link":"https:\/\/1kitap1.com\/en\/beejs-guide-to-network-programming-brian-hall\/","title":{"rendered":"Beejs Guide To Network Programming – Brian Hall"},"content":{"rendered":"
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Slightly Advanced Techniques int get_listener_socket(void) { struct addrinfo hints, *ai, *p; int yes=1; \/\/ for setsockopt() SO_REUSEADDR, below int rv; int listener; \/\/ get us a socket and bind it memset(&hints, 0, sizeof hints); hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_PASSIVE; if ((rv = getaddrinfo(NULL, PORT, &hints, &ai)) != 0) { fprintf(stderr, “selectserver: %s\\n”, gai_strerror(rv)); exit(1); } for(p = ai; p != NULL; p = p->ai_next) { listener = socket(p->ai_family, p->ai_socktype, p->ai_protocol); if (listener < 0) { continue; } \/\/ lose the pesky \"address already in use\" error message setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)); if (bind(listener, p->ai_addr, p->ai_addrlen) < 0) { close(listener); continue; } break; } \/\/ if we got here, it means we didn't get bound if (p == NULL) { fprintf(stderr, \"selectserver: failed to bind\\n\"); exit(2); } freeaddrinfo(ai); \/\/ all done with this \/\/ listen if (listen(listener, 10) == -1) { perror(\"listen\"); exit(3); } return listener; } Chapter 7.<\/p>\n

Slightly Advanced Techniques \/* * Add new incoming connections to the proper sets *\/ void handle_new_connection(int listener, fd_set *master, int *fdmax) { socklen_t addrlen; int newfd; \/\/ newly accept()ed socket descriptor struct sockaddr_storage remoteaddr; \/\/ client address char remoteIP[INET6_ADDRSTRLEN]; addrlen = sizeof remoteaddr; newfd = accept(listener, (struct sockaddr *)&remoteaddr, &addrlen); if (newfd == -1) { perror(“accept”); } else { FD_SET(newfd, master); \/\/ add to master set if (newfd > *fdmax) { \/\/ keep track of the max *fdmax = newfd; } printf(“selectserver: new connection from %s on ” “socket %d\\n”, inet_ntop2(&remoteaddr, remoteIP, sizeof remoteIP), newfd); } } \/* * Broadcast a message to all clients *\/ void broadcast(char *buf, int nbytes, int listener, int s, fd_set *master, int fdmax) { for(int j = 0; j <= fdmax; j++) { \/\/ send to everyone!<\/p>\n

if (FD_ISSET(j, master)) { \/\/ except the listener and ourselves if (j != listener && j != s) { if (send(j, buf, nbytes, 0) == -1) { perror(“send”); } } } } } \/* * Handle client data and hangups *\/ void handle_client_data(int s, int listener, fd_set *master, int fdmax) Chapter 7.<\/p>\n

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