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-.\" Copyright (c) 1983, 1991, 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. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. 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.
-.\"
-.\"     @(#)directory.3	8.1 (Berkeley) 6/4/93
-.\" $FreeBSD: src/lib/libc/gen/directory.3,v 1.12 2001/10/01 16:08:50 ru Exp $
-.\"
-.Dd June 4, 1993
-.Dt DIRECTORY 3
-.Os
-.Sh NAME
-.Nm opendir ,
-.Nm readdir ,
-.Nm readdir_r ,
-.Nm telldir ,
-.Nm seekdir ,
-.Nm rewinddir ,
-.Nm closedir ,
-.Nm dirfd
-.Nd directory operations
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/types.h
-.In dirent.h
-.Ft DIR *
-.Fn opendir "const char *filename"
-.Ft struct dirent *
-.Fn readdir "DIR *dirp"
-.Ft int
-.Fn readdir_r "DIR *dirp" "struct dirent *entry" "struct dirent **result"
-.Ft long
-.Fn telldir "DIR *dirp"
-.Ft void
-.Fn seekdir "DIR *dirp" "long  loc"
-.Ft void
-.Fn rewinddir "DIR *dirp"
-.Ft int
-.Fn closedir "DIR *dirp"
-.Ft int
-.Fn dirfd "DIR *dirp"
-.Sh DESCRIPTION
-The
-.Fn opendir
-function
-opens the directory named by
-.Fa filename ,
-associates a
-.Em directory stream
-with it
-and
-returns a pointer to be used to identify the
-.Em directory stream
-in subsequent operations.  The pointer
-.Dv NULL
-is returned if
-.Fa filename
-cannot be accessed, or if it cannot
-.Xr malloc 3
-enough memory to hold the whole thing.
-.Pp
-The
-.Fn readdir
-function
-returns a pointer to the next directory entry.  It returns
-.Dv NULL
-upon reaching the end of the directory or detecting an invalid
-.Fn seekdir
-operation.
-.Pp
-.Fn readdir_r
-provides the same functionality as
-.Fn readdir ,
-but the caller must provide a directory
-.Fa entry
-buffer to store the results in.  If the read succeeds,
-.Fa result
-is pointed at the
-.Fa entry ;
-upon reaching the end of the directory
-.Fa result
-is set to
-.Dv NULL .
-.Fn readdir_r
-returns 0 on success or an error number to indicate failure.
-.Pp
-The
-.Fn telldir
-function
-returns the current location associated with the named
-.Em directory stream .
-Values returned by
-.Fn telldir
-are good only for the lifetime of the
-.Dv DIR
-pointer,
-.Fa dirp ,
-from which they are derived.  If the directory is closed and then
-reopened, prior values returned by
-.Fn telldir
-will no longer be valid.
-.Pp
-The
-.Fn seekdir
-function
-sets the position of the next
-.Fn readdir
-operation on the
-.Em directory stream .
-The new position reverts to the one associated with the
-.Em directory stream
-when the
-.Fn telldir
-operation was performed.
-.Pp
-The
-.Fn rewinddir
-function
-resets the position of the named
-.Em directory stream
-to the beginning of the directory.
-.Pp
-The
-.Fn closedir
-function
-closes the named
-.Em directory stream
-and frees the structure associated with the
-.Fa dirp
-pointer,
-returning 0 on success.
-On failure, \-1 is returned and the global variable
-.Va errno
-is set to indicate the error.
-.Pp
-The
-.Fn dirfd
-function
-returns the integer file descriptor associated with the named
-.Em directory stream ,
-see
-.Xr open 2 .
-.Pp
-Sample code which searches a directory for entry ``name'' is:
-.Bd -literal -offset indent
-len = strlen(name);
-dirp = opendir(".");
-while ((dp = readdir(dirp)) != NULL)
-	if (dp->d_namlen == len && !strcmp(dp->d_name, name)) {
-		(void)closedir(dirp);
-		return FOUND;
-	}
-(void)closedir(dirp);
-return NOT_FOUND;
-.Ed
-.Sh SEE ALSO
-.Xr close 2 ,
-.Xr lseek 2 ,
-.Xr open 2 ,
-.Xr read 2 ,
-.Xr dir 5
-.Sh HISTORY
-The
-.Fn opendir ,
-.Fn readdir ,
-.Fn telldir ,
-.Fn seekdir ,
-.Fn rewinddir ,
-.Fn closedir ,
-and
-.Fn dirfd
-functions appeared in
-.Bx 4.2 .