2

server-exp/togglesi.c

@@ -0,0 +1,57 @@
+#include "common.h"
+
+void toggle(int conn_sock,int hit) 
+{
+    size_t n; int i,no=0;
+    char buf[MAXLINE]; 
+
+    printf("第%d个客户通信开始\n",hit);
+    while((n =recv(conn_sock, buf, MAXLINE,0))> 0) {
+	printf("toggle服务器收到第%d个客户第%d个消息,长度为%d字节\n", hit,++no,(int)n);
+
+        for(i=0; i<n; i++)
+            if(isupper(buf[i])) 
+                buf[i]=tolower(buf[i]);
+            else if(islower(buf[i]))
+                buf[i]=toupper(buf[i]);
+               
+	send (conn_sock, buf, n, 0);
+    }
+    printf("第%d个客户通信结束\n",hit);
+}
+
+int main(int argc, char **argv) 
+{
+    int listen_sock, conn_sock, port, clientlen;
+    struct sockaddr_in clientaddr;
+    struct hostent *hp;
+    char *haddrp;
+    int hit;
+	
+    if (argc != 2) {
+	    fprintf(stderr, "usage: %s <port>\n", argv[0]);
+	    exit(1);
+    }
+    port = atoi(argv[1]);
+
+    listen_sock = open_listen_sock(port);    
+    if( listen_sock==-1) {
+    	printf("端口号%d繁忙\n",port);
+    	exit(1);
+    }
+    
+    for (hit=1; ; hit++) {
+	    clientlen = sizeof(clientaddr);
+	    conn_sock = accept(listen_sock, (SA *)&clientaddr, &clientlen);
+
+	    /* determine the domain name and IP address of the client */
+	    hp = gethostbyaddr((const char *)&clientaddr.sin_addr.s_addr, 
+			   sizeof(clientaddr.sin_addr.s_addr), AF_INET);
+	    haddrp = inet_ntoa(clientaddr.sin_addr);
+	    printf("server connected to %s (%s)\n", hp->h_name, haddrp);
+
+	    toggle(conn_sock,hit);
+	    close(conn_sock);
+    }
+    exit(0);
+}