select模型詳解

client客戶端：

#include #include #include #include #include #include #include #include #include #include #include #define maxbuf 1024

int main()
/* 初始化伺服器端（對方）的位址和埠資訊 */
bzero(&dest, sizeof(dest));
dest.sin_family = af_inet;
dest.sin_port = htons(3333);
if (inet_aton("127.0.0.1", (struct in_addr *) &dest.sin_addr.s_addr) == 0) 
/* 連線伺服器 */
if (connect(sockfd, (struct sockaddr *) &dest, sizeof(dest)) != 0) 
printf
("\n準備就緒，可以開始聊天了……直接輸入訊息回車即可發資訊給對方\n");
while (1) else if (retval == 0) else 
}if (fd_isset(0, &rfds)) 
/* 發訊息給伺服器 */
len = send(sockfd, buffer, strlen(buffer) - 1, 0);
if (len > 0) else}}
}/* 關閉連線 */
close(sockfd);
return 0;
}

server客戶端：

#include #include #include #include #include #include #include #include #include #include #include #include #include static void sigchld_handler()

/* */
signal(sigchld,sigchld_handler);
} #define maxbuf 1024
int main()
bzero(&my_addr, sizeof(my_addr));
my_addr.sin_family = af_inet;
my_addr.sin_port = htons(3333);
my_addr.sin_addr.s_addr = inaddr_any;
if (bind(sockfd, (struct sockaddr *) &my_addr, sizeof(struct sockaddr))
== -1) 
if (listen(sockfd, lisnum) == -1) 
pid_t pid;
while (1) else
printf("server: got connection from %s, port %d, socket %d\n",
inet_ntoa(their_addr.sin_addr),
ntohs(their_addr.sin_port), new_fd);
printf("fork之前，accept之後\n");
pid=fork();
if(pid>0) 
printf("in child\n");
close(sockfd);
/* 開始處理每個新連線上的資料收發 */
printf
("\n準備就緒，可以開始聊天了……直接輸入訊息回車即可發資訊給對方\n");
int count=0;
while (1) else if (retval == 0) else 
len = send(new_fd, buf, strlen(buf) - 1, 0);
count++;
printf("send count= %d\n",count);
if (len > 0)
printf
("訊息:%s\t傳送成功，共傳送了%d個位元組！,套接字為：%d \n",
buf, len,new_fd);
else 
}if (fd_isset(new_fd, &rfds)) 
}else 
}count++;
printf("out count= %d\n",count);}}
close(new_fd);
/* 處理每個新連線上的資料收發結束 */
printf("還要和其它連線聊天嗎？(no->退出)");
fflush(stdout);
bzero(buf, maxbuf + 1);
fgets(buf, maxbuf, stdin);
if (!strncasecmp(buf, "no", 2)) 
}close(sockfd);
return 0;
}

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