Update examples

examples/udp_client.c

@@ -1,29 +1,28 @@
 #include <stdio.h>
+#include <string.h>
 
 #define SOCK_IMPLEMENTATION
 #include "sock.h"
 
 int main(void)
 {
-    Sock *sock = sock_create(SOCK_IPV4, SOCK_UDP);
-    if (sock == NULL) {
+    Sock *client = sock_create(SOCK_IPV4, SOCK_UDP);
+    if (client == NULL) {
         perror("sock_create");
         return 1;
     }
 
+    SockAddr server_addr = sock_addr("127.0.0.1", 6969);
     const char *msg = "Hello from client!";
-    sock_sendto(sock, msg, strlen(msg), sock_addr("127.0.0.1", 6969));
+    ssize_t sent = sock_sendto(client, msg, strlen(msg), server_addr);
+    if (sent < 0) {
+        perror("sock_sendto");
+        sock_close(client);
+        return 1;
+    }
 
-    SockAddr server_addr;
-    char buf[128];
-    memset(buf, 0, sizeof(buf));
-
-    sock_recvfrom(sock, buf, sizeof(buf), &server_addr);
-
-    printf("Received \"%.*s\" from %s:%d\n", (int)sizeof(buf), buf,
-            server_addr.str, server_addr.port);
-
-    sock_close(sock);
+    printf("Sent message: %s\n", msg);
 
+    sock_close(client);
     return 0;
 }