Client per il servizio echo su UDP e relative chiacchiere

[gapil.git] / listati / UDP_ClientEcho.c

diff --git a/listati/UDP_ClientEcho.c b/listati/UDP_ClientEcho.c
new file mode 100644 (file)
index 0000000..746d5a7
--- /dev/null
+++ b/listati/UDP_ClientEcho.c
@@ -0,0 +1,31 @@
+void ClientEcho(FILE * filein, int socket, struct sockaddr_in * serv_addr) 
+{
+    char sendbuff[MAXLINE+1], recvbuff[MAXLINE+1];
+    int nread, nwrite; 
+    /* initialize file descriptor set */
+    while (1) {
+       if (fgets(sendbuff, MAXLINE, filein) == NULL) {
+           return;                /* if no input just return */
+       } else {                   /* else we have to write to socket */
+           nwrite = sendto(socket, sendbuff, strlen(sendbuff), 0,
+                           (struct sockaddr *) serv_addr, sizeof(*serv_addr));
+           if (nwrite < 0) {      /* on error stop */
+               printf("Errore in scrittura: %s", strerror(errno));
+               return;
+           }
+       }
+       nread = recvfrom(socket, recvbuff, strlen(sendbuff), 0, NULL, NULL); 
+       if (nread < 0) {  /* error condition, stop client */
+           printf("Errore in lettura: %s\n", strerror(errno));
+           return;
+       }
+       if (nread == 0) { /* server closed connection, stop */
+           return;
+       }
+       recvbuff[nread] = 0;   /* else read is ok, write on stdout */
+       if (fputs(recvbuff, stdout) == EOF) {
+           perror("Errore in scrittura su terminale");
+           return;
+       }
+    }
+}