From f84d89b0ca9c8982d436aa12be75554722462090 Mon Sep 17 00:00:00 2001
From: wangxiaoyao <wangxiaoyao@rt-thread.com>
Date: Mon, 20 Feb 2023 13:45:07 +0800
Subject: [PATCH] [libc] including musl signal.h with _POSIX_SOURCE

---
 components/libc/compilers/common/include/sys/signal.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/components/libc/compilers/common/include/sys/signal.h b/components/libc/compilers/common/include/sys/signal.h
index 6e06c8ba14..8e67ae9ae1 100644
--- a/components/libc/compilers/common/include/sys/signal.h
+++ b/components/libc/compilers/common/include/sys/signal.h
@@ -17,7 +17,17 @@ extern "C" {
 #endif /* __cplusplus */
 
 #ifdef RT_USING_MUSLLIBC
+/* this is require for musl <signal.h> */
+#ifndef _POSIX_SOURCE
+#define _POSIX_SOURCE
 #include <signal.h>
+/* limit influenced of _POSIX_SOURCE */
+#undef _POSIX_SOURCE
+
+#else /* ndef _POSIX_SOURCE */
+#include <signal.h>
+#endif
+
 #else
 
 #include <stdint.h>