From ae77ce91c8c0e928e0722218d7f30c2ab073cdc4 Mon Sep 17 00:00:00 2001
From: Collin Funk <collin.funk1@gmail.com>
Date: Sun, 28 Sep 2025 15:26:55 -0700
Subject: [PATCH] manual: Fix missing declaration in select example.
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Without _GNU_SOURCE defined this file fails to compile with the
following error:

    $ gcc manual/examples/select.c
    manual/examples/select.c: In function ‘input_timeout’:
    manual/examples/select.c:44:10: error: implicit declaration of function ‘TEMP_FAILURE_RETRY’ [-Wimplicit-function-declaration]
       44 |   return TEMP_FAILURE_RETRY (select (FD_SETSIZE,
          |          ^~~~~~~~~~~~~~~~~~

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
---
 manual/examples/select.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/manual/examples/select.c b/manual/examples/select.c
index 341b65f11d..db138c3ecd 100644
--- a/manual/examples/select.c
+++ b/manual/examples/select.c
@@ -16,6 +16,7 @@
 */
 
 /*@group*/
+#define _GNU_SOURCE 1
 #include <errno.h>
 #include <stdio.h>
 #include <unistd.h>
-- 
2.47.3