include: posix: Split dirent.h from unistd.h

From POSIX
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/dirent.h.html

"""
The <dirent.h> header shall define the following type:
DIR

...

also define the structure dirent
"""

etc.

Signed-off-by: Paul Sokolovsky <[email protected]>

Author: pfalcon

include/posix/dirent.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2018 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#ifndef ZEPHYR_INCLUDE_POSIX_DIRENT_H_
+#define ZEPHYR_INCLUDE_POSIX_DIRENT_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <limits.h>
+#include "sys/types.h"
+
+#ifdef CONFIG_POSIX_FS
+#include <fs.h>
+
+typedef struct fs_dir_t DIR;
+
+struct dirent {
+	unsigned int d_ino;
+	char d_name[PATH_MAX + 1];
+};
+
+/* Directory related operations */
+extern DIR *opendir(const char *dirname);
+extern int closedir(DIR *dirp);
+extern struct dirent *readdir(DIR *dirp);
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* ZEPHYR_INCLUDE_POSIX_DIRENT_H_ */

include/posix/unistd.h

@@ -16,26 +16,15 @@ extern "C" {
 #ifdef CONFIG_POSIX_FS
 #include <fs.h>
 
-typedef struct fs_dir_t DIR;
 typedef unsigned int mode_t;
 
-struct dirent {
-	unsigned int d_ino;
-	char d_name[PATH_MAX + 1];
-};
-
 /* File related operations */
 extern int open(const char *name, int flags);
 extern int close(int file);
 extern ssize_t write(int file, char *buffer, unsigned int count);
 extern ssize_t read(int file, char *buffer, unsigned int count);
 extern int lseek(int file, int offset, int whence);
 
-/* Directory related operations */
-extern DIR *opendir(const char *dirname);
-extern int closedir(DIR *dirp);
-extern struct dirent *readdir(DIR *dirp);
-
 /* File System related operations */
 extern int rename(const char *old, const char *newp);
 extern int unlink(const char *path);

lib/posix/fs.c

@@ -9,6 +9,7 @@
 #include <limits.h>
 #include <posix/pthread.h>
 #include <posix/unistd.h>
+#include <posix/dirent.h>
 #include <string.h>
 
 BUILD_ASSERT_MSG(PATH_MAX > MAX_FILE_NAME,

tests/posix/fs/src/test_fs_dir.c

@@ -6,6 +6,7 @@
 
 #include <stdio.h>
 #include <posix/unistd.h>
+#include <posix/dirent.h>
 #include "test_fs.h"
 
 extern int test_file_write(void);