Creato server-client daytime e print_ip_client

8.client-server-echo/echosrv.c~

@@ -0,0 +1,59 @@
+/* Implementa un echo server che risponde alla porta definita dall'utente */
+/* Crea un figlio per ogni client */
+
+#include	"/..basic.h"
+
+void server_echo(int sockfd);
+
+int main(int argc, char **argv) {
+        pid_t			childpid;
+	int			listenfd, connfd;
+	struct sockaddr_in	servaddr, cliaddr;
+	socklen_t		cliaddr_len;
+
+        if( argc != 2){
+           printf("Usage: echosrv <PORT> \n"); exit(1); 
+}
+
+	if( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
+		{ printf("socket error\n"); exit(1); }
+
+	bzero(&servaddr, sizeof(servaddr));
+	servaddr.sin_family      = AF_INET;
+	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);  /* wildcard address */
+	servaddr.sin_port        = htons(atoi(argv[1]));	/* echo server */
+
+	if( (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr))) < 0)
+		 { printf("bind error\n"); exit(1); }
+
+	if( listen(listenfd, BACKLOG) < 0 )
+		{ printf("listen error\n"); exit(1);}
+
+	for ( ; ; ) {
+		cliaddr_len = sizeof(cliaddr);
+		if( (connfd = accept(listenfd, (struct sockaddr *) &cliaddr, &cliaddr_len)) < 0)
+			{ printf("accept error\n"); exit(1); }
+
+                if( (childpid = fork()) == 0 ) {
+		    close(listenfd);
+		    server_echo(connfd);      /* svolge tutto il lavoro del server */
+		    exit(0);
+		}
+
+		close(connfd);
+	}
+}
+
+void server_echo(int sockfd) {
+        ssize_t         n;
+        char            line[MAXLINE];
+        for ( ; ; ) {
+                if ( (n = reti_readline(sockfd, line, MAXLINE)) == 0)
+		{
+			printf("\n Connessione chiusa dal client \n");
+                        return;         /* connection closed by other end */
+		}
+	      reti_writen(sockfd, line, n);
+        }
+}
+