各位高手們 ~ 請問一下 要在 Linux 建立 TCP server，程式如下 ... 遇到的問題: (1) 為什麼斷線之後，重新連線卻連不上? (2) port 被佔住(client 端不正常斷線)，應該如何解決被佔住的問題? (3) 假如要支援多人登入，請問要如何修改或是哪裡可以找到相關資料? (4) 請問 time out 的話，要怎麼解決，讓 server 可以自動重新運作? Thanks #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <sys/errno.h> #define SERV_PORT 5134 #define MAXNAME 1024 extern int errno; main() { int socket_fd; /* file description into transport */ int recfd; /* file descriptor to accept */ int length; /* length of address structure */ int nbytes; /* the number of read **/ char buf[BUFSIZ]; struct sockaddr_in myaddr; /* address of this service */ struct sockaddr_in client_addr; /* address of client */ if ((socket_fd = socket(AF_INET, SOCK_STREAM, 0)) <0) { perror ("socket failed"); exit(1); } bzero ((char *)&myaddr, sizeof(myaddr)); myaddr.sin_family = AF_INET; myaddr.sin_addr.s_addr = htonl(INADDR_ANY); myaddr.sin_port = htons(SERV_PORT); if (bind(socket_fd, (struct sockaddr *)&myaddr, sizeof(myaddr)) <0) { perror ("bind failed"); exit(1); } if (listen(socket_fd, 20) <0) { perror ("listen failed"); exit(1); } length = sizeof(client_addr); printf("Server is ready to receive !!\n"); printf("Can strike Cntrl-c to stop Server >>\n"); while (1) { if ((recfd = accept(socket_fd, (struct sockaddr_in *)&client_addr, &length)) <0) { perror ("could not accept call"); exit(1); } if ((nbytes = read(recfd, &buf, BUFSIZ)) < 0) { perror("read of data error nbytes !"); exit (1); } printf("Create socket #%d form %s : %d\n", recfd, inet_ntoa(client_addr.sin_addr), htons(client_addr.sin_port)); printf("%s\n", &buf); /* return to client */ if (write(recfd, &buf, nbytes) == -1) { perror ("write to client error"); exit(1); } close(recfd); printf("Can Strike Crtl-c to stop Server >>\n"); } } --

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