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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /dirent/dirent.h
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+/* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+/*
+ *	POSIX Standard: 5.1.2 Directory Operations	<dirent.h>
+ */
+
+#ifndef	_DIRENT_H
+
+#define	_DIRENT_H	1
+#include <features.h>
+
+__BEGIN_DECLS
+
+#include <gnu/types.h>
+
+
+/* Directory entry structure.
+
+   This structure is laid out identically to the `struct direct' that
+   represents directory entries in the GNU Hurd and in BSD 4.4 (and
+   incidentally, on disk in the Berkeley fast file system).  The `readdir'
+   implementations for GNU and BSD know this; you must change them if you
+   change this structure.  */
+
+struct dirent
+  {
+    __ino_t d_fileno;		/* File serial number.  */
+    unsigned short int d_reclen; /* Length of the whole `struct dirent'.  */
+    unsigned char d_type;	/* File type, possibly unknown.  */
+    unsigned char d_namlen;	/* Length of the file name.  */
+
+    /* Only this member is in the POSIX standard.  */
+    char d_name[1];		/* File name (actually longer).  */
+  };
+
+#if defined(__USE_BSD) || defined(__USE_MISC)
+#define	d_ino		d_fileno /* Backward compatibility.  */
+#endif
+
+#ifdef __USE_BSD
+/* File types for `d_type'.  */
+enum
+  {
+    DT_UNKNOWN = 0,
+    DT_FIFO = 1,
+    DT_CHR = 2,
+    DT_DIR = 4,
+    DT_BLK = 6,
+    DT_REG = 8,
+    DT_LNK = 10,
+    DT_SOCK = 12
+  };
+
+/* Convert between stat structure types and directory types.  */
+#define	IFTODT(mode)	(((mode) & 0170000) >> 12)
+#define	DTTOIF(dirtype)	((dirtype) << 12)
+#endif
+
+
+/* Get the system-dependent definition of `DIR',
+   the data type of directory stream objects.  */
+#include <dirstream.h>
+
+/* Open a directory stream on NAME.
+   Return a DIR stream on the directory, or NULL if it could not be opened.  */
+extern DIR *opendir __P ((__const char *__name));
+
+/* Close the directory stream DIRP.
+   Return 0 if successful, -1 if not.  */
+extern int closedir __P ((DIR * __dirp));
+
+/* Read a directory entry from DIRP.
+   Return a pointer to a `struct dirent' describing the entry,
+   or NULL for EOF or error.  The storage returned may be overwritten
+   by a later readdir call on the same DIR stream.  */
+extern struct dirent *readdir __P ((DIR * __dirp));
+
+/* Rewind DIRP to the beginning of the directory.  */
+extern void rewinddir __P ((DIR * __dirp));
+
+#if defined(__USE_BSD) || defined(__USE_MISC)
+
+#ifndef	MAXNAMLEN
+/* Get the definitions of the POSIX.1 limits.  */
+#include <posix1_lim.h>
+
+/* `MAXNAMLEN' is the BSD name for what POSIX calls `NAME_MAX'.  */
+#ifdef	NAME_MAX
+#define	MAXNAMLEN	NAME_MAX
+#else
+#define	MAXNAMLEN	255
+#endif
+#endif
+
+#include <gnu/types.h>
+#define __need_size_t
+#include <stddef.h>
+
+/* Seek to position POS on DIRP.  */
+extern void seekdir __P ((DIR * __dirp, __off_t __pos));
+
+/* Return the current position of DIRP.  */
+extern __off_t telldir __P ((DIR * __dirp));
+
+/* Scan the directory DIR, calling SELECT on each directory entry.
+   Entries for which SELECT returns nonzero are individually malloc'd,
+   sorted using qsort with CMP, and collected in a malloc'd array in
+   *NAMELIST.  Returns the number of entries selected, or -1 on error.  */
+extern int scandir __P ((__const char *__dir,
+			 struct dirent ***__namelist,
+			 int (*__select) __P ((struct dirent *)),
+			 int (*__cmp) __P ((__const __ptr_t,
+					    __const __ptr_t))));
+
+/* Function to compare two `struct dirent's alphabetically.  */
+extern int alphasort __P ((__const __ptr_t, __const __ptr_t));
+
+
+/* Read directory entries from FD into BUF, reading at most NBYTES.
+   Reading starts at offset *BASEP, and *BASEP is updated with the new
+   position after reading.  Returns the number of bytes read; zero when at
+   end of directory; or -1 for errors.  */
+extern __ssize_t __getdirentries __P ((int __fd, char *__buf,
+				       size_t __nbytes, __off_t *__basep));
+extern __ssize_t getdirentries __P ((int __fd, char *__buf,
+				     size_t __nbytes, __off_t *__basep));
+
+
+#endif /* Use BSD or misc.  */
+
+__END_DECLS
+
+#endif /* dirent.h  */