cleanup: include/: move misc/errno_private.h to sys/errno_private.h

move misc/errno_private.h to sys/errno_private.h and
create a shim for backward-compatibility.

No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.

Related to #16539

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

include/misc/errno_private.h

@@ -1,36 +1,15 @@
 /*
- * Copyright (c) 2018 Intel Corporation.
+ * Copyright (c) 2019 Intel Corporation
  *
  * SPDX-License-Identifier: Apache-2.0
  */
-
 #ifndef ZEPHYR_INCLUDE_MISC_ERRNO_PRIVATE_H_
 #define ZEPHYR_INCLUDE_MISC_ERRNO_PRIVATE_H_
 
-#include <toolchain.h>
-
-#ifdef __cplusplus
-extern "C" {
+#ifndef CONFIG_COMPAT_INCLUDES
+#warning "This header file has moved, include <sys/errno_private.h> instead."
 #endif
 
-/* NOTE: located here to avoid include dependency loops between errno.h
- * and kernel.h
- */
-
-/**
- * return a pointer to a memory location containing errno
- *
- * errno is thread-specific, and can't just be a global. This pointer
- * is guaranteed to be read/writable from user mode.
- *
- * @return Memory location of errno data for current thread
- */
-__syscall int *z_errno(void);
-
-#ifdef __cplusplus
-}
-#endif
-
-#include <syscalls/errno_private.h>
+#include <sys/errno_private.h>
 
 #endif /* ZEPHYR_INCLUDE_MISC_ERRNO_PRIVATE_H_ */

include/sys/errno_private.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2018 Intel Corporation.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_INCLUDE_SYS_ERRNO_PRIVATE_H_
+#define ZEPHYR_INCLUDE_SYS_ERRNO_PRIVATE_H_
+
+#include <toolchain.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* NOTE: located here to avoid include dependency loops between errno.h
+ * and kernel.h
+ */
+
+/**
+ * return a pointer to a memory location containing errno
+ *
+ * errno is thread-specific, and can't just be a global. This pointer
+ * is guaranteed to be read/writable from user mode.
+ *
+ * @return Memory location of errno data for current thread
+ */
+__syscall int *z_errno(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#include <syscalls/errno_private.h>
+
+#endif /* ZEPHYR_INCLUDE_SYS_ERRNO_PRIVATE_H_ */

lib/libc/minimal/include/errno.h

@@ -17,7 +17,7 @@
 #ifndef ZEPHYR_LIB_LIBC_MINIMAL_INCLUDE_ERRNO_H_
 #define ZEPHYR_LIB_LIBC_MINIMAL_INCLUDE_ERRNO_H_
 
-#include <misc/errno_private.h>
+#include <sys/errno_private.h>
 
 #ifdef __cplusplus
 extern "C" {

lib/libc/newlib/libc-hooks.c

@@ -11,7 +11,7 @@
 #include <linker/linker-defs.h>
 #include <misc/util.h>
 #include <kernel_internal.h>
-#include <misc/errno_private.h>
+#include <sys/errno_private.h>
 #include <misc/libc-hooks.h>
 #include <syscall_handler.h>
 #include <app_memory/app_memdomain.h>