Merge pull request #4679 from mysterywolf/sys-errno

[bug][libc]修复因libc移除sys/errno.h文件导致的报错

components/libc/pthreads/posix_types.h

@@ -19,16 +19,9 @@
 
 #include <sys/types.h>
 #include <sys/time.h>
-
-/* errno for Keil MDK */
-#if defined(__CC_ARM) || defined(__IAR_SYSTEMS_ICC__)
-#include <sys/errno.h>
-#include <sys/unistd.h>
-#else
 #include <unistd.h>
 #include <errno.h>
 #include <fcntl.h>
-#endif
 
 #endif
 

components/net/lwip-2.1.2/src/arch/include/arch/cc.h

@@ -46,17 +46,16 @@
 #define X32_F "lx"
 
 #ifdef RT_USING_LIBC
-#if defined(__CC_ARM) || defined(__CLANG_ARM) || defined(__IAR_SYSTEMS_ICC__)
-#include <sys/errno.h>
-#else
 #include <errno.h>
-/* some errno not defined in newlib */
+#ifndef ENSRNOTFOUND
 #define ENSRNOTFOUND 163  /* Domain name not found */
+#endif
+#ifndef ESHUTDOWN
 /* WARNING: ESHUTDOWN also not defined in newlib. We chose
             180 here because the number "108" which is used
             in arch.h has been assigned to another error code. */
 #define ESHUTDOWN 180
-#endif /* __CC_ARM/__IAR_SYSTEMS_ICC__ */
+#endif
 #endif /* RT_USING_LIBC */
 
 #if defined(RT_USING_LIBC) || defined(RT_LIBC_USING_TIME) || (defined( __GNUC__ ) && !defined(__ARMCC_VERSION))