RTEMS: Add struct dirent::d_type member

This is used by the file system support of libstdc++ for example.  Use
content from latest FreeBSD <sys/dirent.h>

Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>

newlib/libc/sys/rtems/include/sys/dirent.h

@@ -1,17 +1,53 @@
-#ifndef _SYS_DIRENT_H
+/*-
-# define _SYS_DIRENT_H
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)dirent.h	8.3 (Berkeley) 8/10/94
+ * $FreeBSD: head/sys/sys/dirent.h 335494 2018-06-21 16:40:07Z bdrewery $
+ */
 
-#ifdef __cplusplus
+#ifndef	_SYS_DIRENT_H_
-extern "C" {
+#define	_SYS_DIRENT_H_
+
+#include <sys/cdefs.h>
+#include <sys/_types.h>
+#include <sys/syslimits.h>
+
+#ifndef _INO_T_DECLARED
+typedef	__ino_t		ino_t;
+#define	_INO_T_DECLARED
 #endif
 
-/*
+#ifndef _OFF_T_DECLARED
- * This file was written to be compatible with the BSD directory
+typedef	__off_t		off_t;
- * routines, so it looks like it.  But it was written from scratch.
+#define	_OFF_T_DECLARED
- * Sean Eric Fagan, sef@Kithrup.COM
+#endif
- *
- *  Copied to RTEMS configuration without modification.
- */
 
 typedef struct _dirdesc {
 	int	dd_fd;
@@ -22,28 +58,63 @@ typedef struct _dirdesc {
 	long	dd_seek;
 } DIR;
 
-# define __dirfd(dp)	((dp)->dd_fd)
+/*
-
+ * The dirent structure defines the format of directory entries returned by
-#include <sys/types.h>
+ * the getdirentries(2) system call.
-
+ *
-#include <limits.h>
+ * A directory entry has a struct dirent at the front of it, containing its
+ * inode number, the length of the entry, and the length of the name
+ * contained in the entry.  These are followed by the name padded to an 8
+ * byte boundary with null bytes.  All names are guaranteed null terminated.
+ * The maximum length of a name in a directory is MAXNAMLEN.
+ *
+ * Explicit padding between the last member of the header (d_namlen) and
+ * d_name avoids ABI padding at the end of dirent on LP64 architectures.
+ * There is code depending on d_name being last.
+ */
 
 struct dirent {
-	long	d_ino;
+	ino_t      d_fileno;		/* file number of entry */
-	off_t	d_off;
+	off_t      d_off;		/* directory offset of entry */
-	unsigned short	d_reclen;
+	__uint16_t d_reclen;		/* length of this record */
-	/* we need better syntax for variable-sized arrays */
+	__uint8_t  d_type;		/* file type, see below */
-	unsigned short	d_namlen;
+	__uint16_t d_namlen;		/* length of string in d_name */
-	char		d_name[NAME_MAX + 1];
+	char	d_name[NAME_MAX + 1];	/* name must be no longer than this */
 };
 
 #if __BSD_VISIBLE
 #define	MAXNAMLEN	NAME_MAX
 #endif
 
-#ifdef __cplusplus
+/*
-}
+ * XXX this is probably illegal in the __XSI_VISIBLE case, but brings us closer
-#endif
+ * to the specification.
+ */
+#define	d_ino		d_fileno	/* backward and XSI compatibility */
 
+#define	__dirfd(dp)	((dp)->dd_fd)
 
-#endif
+#if __BSD_VISIBLE
+
+/*
+ * File types
+ */
+#define	DT_UNKNOWN	 0
+#define	DT_FIFO		 1
+#define	DT_CHR		 2
+#define	DT_DIR		 4
+#define	DT_BLK		 6
+#define	DT_REG		 8
+#define	DT_LNK		10
+#define	DT_SOCK		12
+#define	DT_WHT		14
+
+/*
+ * Convert between stat structure types and directory types.
+ */
+#define	IFTODT(mode)	(((mode) & 0170000) >> 12)
+#define	DTTOIF(dirtype)	((dirtype) << 12)
+
+#endif /* __BSD_VISIBLE */
+
+#endif /* !_SYS_DIRENT_H_ */