examples: line-buffer stdout so tests reliably capture server output

examples/tpmcertserver/tpmcertclient.c

@@ -101,6 +101,9 @@ int main(int argc, char* argv[])
     byte txt[] = "hello from tpmcertclient\n";
     byte rxBuf[TPMCC_BUF_SZ];
 
+    /* Line-buffer stdout so output is visible immediately when redirected. */
+    setvbuf(stdout, NULL, _IOLBF, 0);
+
     for (i = 1; i < argc; i++) {
         if (XSTRCMP(argv[i], "-p") == 0 && i + 1 < argc)
             port = (word16)atoi(argv[++i]);

examples/tpmcertserver/tpmcertserver.c

@@ -244,6 +244,10 @@ int main(int argc, char* argv[])
     byte certDer[TPMCS_CERT_MAX];
     word32 certDerSz = (word32)sizeof(certDer);
 
+    /* Line-buffer stdout so progress is visible immediately when redirected to
+     * a file (the server runs while a test reads its output). */
+    setvbuf(stdout, NULL, _IOLBF, 0);
+
     XMEMSET(&dev, 0, sizeof(dev));
     XMEMSET(&hostKey, 0, sizeof(hostKey));