Extended Attributes was a piece to get to ACLs, however ACLs have not

been worked on, so EA is pointless to maintain.

7 files changed, 2 insertions, 503 deletions

diff --git a/lib/libc/Makefile.inc b/lib/libc/Makefile.inc
index 2a3f4cd5ee1..2530ec86a47 100644
--- a/lib/libc/Makefile.inc
+++ b/lib/libc/Makefile.inc
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.inc,v 1.10 2005/03/07 02:26:41 deraadt Exp $
+#	$OpenBSD: Makefile.inc,v 1.11 2005/06/17 20:37:31 drahn Exp $
 #
 # This file contains make rules used to build libc
 #
@@ -51,7 +51,6 @@ AINC+=  -nostdinc -idirafter ${DESTDIR}/usr/include
 .include "${LIBCSRCDIR}/thread/Makefile.inc"
 .include "${LIBCSRCDIR}/time/Makefile.inc"
 .include "${LIBCSRCDIR}/sys/Makefile.inc"
-.include "${LIBCSRCDIR}/posix1e/Makefile.inc"
 .if (${YP:L} == "yes")
 .include "${LIBCSRCDIR}/yp/Makefile.inc"
 .endif
diff --git a/lib/libc/posix1e/Makefile.inc b/lib/libc/posix1e/Makefile.inc
deleted file mode 100644
index 500755ec237..00000000000
--- a/lib/libc/posix1e/Makefile.inc
+++ /dev/null
@@ -1,11 +0,0 @@
-#	$OpenBSD: Makefile.inc,v 1.1 2002/02/22 21:06:00 drahn Exp $
-
-.PATH: ${.CURDIR}/../libc/posix1e
-
-SRCS+=	extattr_name.c
-
-MAN+=	posix1e.3			\
-	extattr.3
-
-MLINKS+= extattr.3 extattr_namespace_to_string.3 \
-        extattr.3 extattr_string_to_namespace.3
diff --git a/lib/libc/posix1e/extattr.3 b/lib/libc/posix1e/extattr.3
deleted file mode 100644
index ca8e062ffe7..00000000000
--- a/lib/libc/posix1e/extattr.3
+++ /dev/null
@@ -1,97 +0,0 @@
-.\"	$OpenBSD: extattr.3,v 1.5 2003/05/03 18:57:40 jmc Exp $
-.\"
-.\" Copyright (c) 2001 Dima Dorfman <dd@FreeBSD.org>
-.\" 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.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
-.\"
-.\" $FreeBSD: extattr.3,v 1.3 2001/10/01 16:09:18 ru Exp $
-.\"
-.Dd June 24, 2001
-.Dt EXTATTR 3
-.Os
-.Sh NAME
-.Nm extattr_namespace_to_string ,
-.Nm extattr_string_to_namespace
-.Nd "convert an extended attribute namespace identifier to a string and vice versa"
-.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <sys/extattr.h>
-.Ft int
-.Fn extattr_namespace_to_string "int attrnamespace" "char **string"
-.Ft int
-.Fn extattr_string_to_namespace "const char *string" "int *attrnamespace"
-.Sh DESCRIPTION
-The
-.Fn extattr_namespace_to_string
-function converts a VFS extended attribute identifier to a human-readable
-string;
-the
-.Fn extattr_string_to_namespace
-function undoes the aforementioned operation,
-and converts a human-readable string representing a namespace to a
-namespace identifier.
-Although a filesystem may implement arbitrary namespaces,
-these functions only support the
-.Dv EXTATTR_NAMESPACE_USER
-.Pq Dq user
-and
-.Dv EXTATTR_NAMESPACE_SYSTEM
-.Pq Dq system
-namespaces,
-which are defined in
-.Xr extattr 9 .
-.Pp
-These functions are meant to be used in error reporting and other
-interactive tasks.
-For example,
-instead of printing the integer identifying an extended attribute in
-an error message,
-a program might use
-.Fn extattr_namespace_to_string
-to obtain a human-readable representation.
-Likewise,
-instead of requiring a user to enter the integer representing a namespace,
-an interactive program might ask for a name and use
-.Fn extattr_string_to_namespace
-to get the desired identifier.
-.Sh RETURN VALUES
-If any of the calls are unsuccessful, the value \-1 is returned
-and the global variable
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The requested namespace could not be identified.
-.El
-.Sh SEE ALSO
-.Xr extattr 2 ,
-.Xr getextattr 8 ,
-.Xr setextattr 8 ,
-.Xr extattr 9
-.Sh HISTORY
-Extended attribute support was developed as part of the
-.Tn TrustedBSD
-Project.
-It was developed to support security extensions requiring additional labels
-to be associated with each file or directory.
diff --git a/lib/libc/posix1e/extattr_name.c b/lib/libc/posix1e/extattr_name.c
deleted file mode 100644
index 73496592826..00000000000
--- a/lib/libc/posix1e/extattr_name.c
+++ /dev/null
@@ -1,79 +0,0 @@
-/*	$OpenBSD: extattr_name.c,v 1.1 2002/02/22 21:06:00 drahn Exp $	*/
-/*-
- * Copyright (c) 2001 Robert N. M. Watson
- * 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.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
- */
-
-/*
-__FBSDID("$FreeBSD: extattr.c,v 1.3 2001/09/30 22:35:07 dillon Exp $");
-*/
-
-/*
- * TrustedBSD: Utility functions for extended attributes.
- */
-
-#include <sys/types.h>
-#include <sys/extattr.h>
-
-#include <errno.h>
-#include <string.h>
-
-int
-extattr_namespace_to_string(int attrnamespace, char **string)
-{
-
-	switch(attrnamespace) {
-	case EXTATTR_NAMESPACE_USER:
-		if (*string != NULL)
-			*string = strdup(EXTATTR_NAMESPACE_USER_STRING);
-		return (0);
-
-	case EXTATTR_NAMESPACE_SYSTEM:
-		if (*string != NULL)
-			*string = strdup(EXTATTR_NAMESPACE_SYSTEM_STRING);
-		return (0);
-
-	default:
-		errno = EINVAL;
-		return (-1);
-	}
-}
-
-int
-extattr_string_to_namespace(const char *string, int *attrnamespace)
-{
-
-	if (!strcmp(string, EXTATTR_NAMESPACE_USER_STRING)) {
-		if (attrnamespace != NULL)
-			*attrnamespace = EXTATTR_NAMESPACE_USER;
-		return (0);
-	} else if (!strcmp(string, EXTATTR_NAMESPACE_SYSTEM_STRING)) {
-		if (attrnamespace != NULL)
-			*attrnamespace = EXTATTR_NAMESPACE_SYSTEM;
-		return (0);
-	} else {
-		errno = EINVAL;
-		return (-1);
-	}
-}
diff --git a/lib/libc/posix1e/posix1e.3 b/lib/libc/posix1e/posix1e.3
deleted file mode 100644
index 51da3848623..00000000000
--- a/lib/libc/posix1e/posix1e.3
+++ /dev/null
@@ -1,81 +0,0 @@
-.\"	$OpenBSD: posix1e.3,v 1.6 2003/05/07 08:52:43 jmc Exp $
-.\"
-.\" Copyright (c) 2000 Robert N. M. Watson
-.\" 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.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
-.\"
-.\" $FreeBSD: src/lib/libc/posix1e/posix1e.3,v 1.19 2001/09/11 09:26:38 ru Exp $
-.\"
-.Dd January 17, 2000
-.Dt POSIX1E 3
-.Os
-.Sh NAME
-.Nm posix1e
-.Nd introduction to the POSIX.1e security API
-.Sh DESCRIPTION
-The IEEE POSIX.1e specification never left draft form, but the interfaces
-it describes are now widely used despite inherent limitations.
-Currently, only a few of the interfaces and features are implemented in
-.Ox ,
-although efforts are underway to complete the integration at this time.
-.Pp
-POSIX.1e describes five security extensions to the base POSIX.1 API:
-Access Control Lists (ACLs), Auditing, Capabilities, Mandatory Access
-Control, and Information Flow Labels.
-.Pp
-POSIX.1e defines both syntax and semantics for these features, but fairly
-substantial changes are required to implement these features in the
-operating system.
-.Sh IMPLEMENTATION NOTES
-.Fx Ns 's
-support for POSIX.1e interfaces and features is still under
-development at this time.
-.Sh ENVIRONMENT
-POSIX.1e assigns security labels to all objects, extending the security
-functionality described in POSIX.1.
-These additional labels provide fine-grained discretionary access control,
-fine-grained capabilities,
-and labels necessary for mandatory access control.
-POSIX.2c describes
-a set of userland utilities for manipulating these labels.
-.Sh SEE ALSO
-.Xr extattr 9
-.Sh STANDARDS
-POSIX.1e is described in IEEE POSIX.1e draft 17.
-Discussion of the draft continues on the cross-platform POSIX.1e implementation
-mailing list.
-To join this list, see the
-.Ox
-POSIX.1e implementation
-page for more information.
-.Sh HISTORY
-POSIX.1e support was introduced in
-.Ox 3.1
-and development continues.
-.Sh AUTHORS
-.An Robert N M Watson
-.An Chris D. Faulhaber
-.An Thomas Moestl
-.An Ilmar S Habibulin
-.Sh BUGS
-These features are not yet fully implemented.
diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc
index 53a1ac48ce2..1d3a5e0188c 100644
--- a/lib/libc/sys/Makefile.inc
+++ b/lib/libc/sys/Makefile.inc
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.inc,v 1.72 2005/06/17 20:36:10 millert Exp $
+#	$OpenBSD: Makefile.inc,v 1.73 2005/06/17 20:37:31 drahn Exp $
 #	$NetBSD: Makefile.inc,v 1.35 1995/10/16 23:49:07 jtc Exp $
 #	@(#)Makefile.inc	8.1 (Berkeley) 6/17/93
 
@@ -59,10 +59,6 @@ ASM=	accept.o access.o acct.o adjtime.o bind.o chdir.o chflags.o chmod.o \
 	utimes.o vadvise.o wait4.o write.o writev.o xfspioctl.o __semctl.o \
 	__syscall.o __sysctl.o
 
-ASM+=	extattrctl.o extattr_set_file.o extattr_get_file.o \
-	extattr_delete_file.o extattr_set_fd.o extattr_get_fd.o \
-	extattr_delete_fd.o
-
 GASM=	${ASM:.o=.go}
 PASM=	${ASM:.o=.po}
 SASM=	${ASM:.o=.so}
@@ -228,14 +224,6 @@ MAN+=	accept.2 access.2 acct.2 adjtime.2 bind.2 brk.2 chdir.2 chflags.2 \
 	statfs.2 swapctl.2 symlink.2 sync.2 sysarch.2 syscall.2 truncate.2 \
 	umask.2 unlink.2 utimes.2 vfork.2 wait.2 write.2
 
-MAN+=	extattr_get_file.2
-MLINKS+=extattr_get_file.2 extattr_set_file.2 \
-	extattr_get_file.2 extattr_delete_file.2 \
-	extattr_get_file.2 extattr_get_fd.2 \
-	extattr_get_file.2 extattr_set_fd.2 \
-	extattr_get_file.2 extattr_delete_fd.2 \
-	extattr_get_file.2 extattr.2
-
 MAN+=	msgctl.2 shmctl.2 shmat.2 semop.2 semget.2 semctl.2 msgsnd.2 msgrcv.2 \
 	msgget.2 shmget.2
 
diff --git a/lib/libc/sys/extattr_get_file.2 b/lib/libc/sys/extattr_get_file.2
deleted file mode 100644
index ba9a80def36..00000000000
--- a/lib/libc/sys/extattr_get_file.2
+++ /dev/null
@@ -1,220 +0,0 @@
-.\" $OpenBSD: extattr_get_file.2,v 1.6 2003/06/01 20:02:40 jmc Exp $
-.\"
-.\" Copyright (c) 2001 Dima Dorfman <dima@unixfreak.org>
-.\" 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.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
-.\"
-.\" $FreeBSD: extattr_get_file.2,v 1.7 2002/02/10 04:46:28 rwatson Exp $
-.\"
-.Dd March 28, 2001
-.Dt EXTATTR 2
-.Os
-.Sh NAME
-.Nm extattr_get_fd ,
-.Nm extattr_set_fd ,
-.Nm extattr_delete_fd ,
-.Nm extattr_get_file ,
-.Nm extattr_set_file ,
-.Nm extattr_delete_file
-.Nd system calls to manipulate VFS extended attributes
-.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <sys/extattr.h>
-.Ft ssize_t
-.Fn extattr_get_fd "int fd" "int attrnamespace" "const char *attrname" "void *data" "size_t nbytes"
-.Ft int
-.Fn extattr_set_fd "int fd" "int attrnamespace" "const char *attrname" "const void *data" "size_t nbytes"
-.Ft int
-.Fn extattr_delete_fd "int fd" "int attrnamespace" "const char *attrname"
-.Ft ssize_t
-.Fn extattr_get_file "const char *path" "int attrnamespace" "const char *attrname" "void *data" "size_t nbytes"
-.Ft int
-.Fn extattr_set_file "const char *path" "int attrnamespace" "const char *attrname" "const void *data" "size_t nbytes"
-.Ft int
-.Fn extattr_delete_file "const char *path" "int attrnamespace" "const char *attrname"
-.Sh DESCRIPTION
-Named extended attributes are meta-data associated with vnodes
-representing files and directories.
-They exist as
-.Qq Li name=value
-pairs within a set of namespaces.
-The
-.Fn extattr_get_file
-call retrieves the value of the specified extended attribute into
-a buffer pointed to by
-.Fa data
-of size
-.Fa nbytes .
-The
-.Fn extattr_set_file
-call sets the value of the specified extended attribute to the data
-described by
-.Fa data .
-The
-.Fn extattr_delete_file
-call deletes the extended attribute specified.
-The
-.Fn extattr_get_file
-and
-.Fn extattr_set_file
-calls consume the
-.Fa data
-and
-.Fa nbytes
-arguments in the style of
-.Xr read 2
-and
-.Xr write 2 ,
-respectively.
-If
-.Fa data
-is
-.Dv NULL
-in a call to
-.Fn extattr_get_file
-then the size of defined extended attribute data will be returned, rather
-than the quantity read, permitting applications to test the size of the
-data without performing a read.
-.Pp
-The
-.Fn extatttr_get_fd ,
-.Fn extattr_set_fd ,
-and
-.Fn extattr_delete_fd
-calls are identical to their
-.Qq Li _file
-counterparts except for the first argument.
-The
-.Qq Li _fd
-functions take a file descriptor, while the
-.Qq Li _file
-functions take a path.
-Both arguments describe a file associated with the extended attribute
-that should be manipulated.
-.Pp
-The following arguments are common to all the system calls described here:
-.Bl -tag -width attrnamespace
-.It Fa attrnamespace
-the namespace in which the extended attribute resides; see
-.Xr extattr 9
-.It Fa attrname
-the name of the extended attribute
-.El
-.Pp
-Named extended attribute semantics vary by filesystem implementing the call.
-Not all operations may be supported for a particular attribute.
-Additionally, the format of the data in
-.Fa data
-is attribute-specific.
-.Pp
-For more information on named extended attributes, please see
-.Xr extattr 9 .
-.Sh RETURN VALUES
-If successful, the
-.Fn extattr_get_file
-and
-.Fn extattr_set_file
-calls return the number of bytes
-that were read or written from the
-.Fa data ,
-respectively, or if
-.Fa data
-was
-.Dv NULL ,
-then
-.Fn extattr_get_file
-returns the number of bytes available to read.
-If any of the calls are unsuccessful, the value \-1 is returned
-and the global variable
-.Va errno
-is set to indicate the error.
-.Pp
-.Rv -std extattr_delete_file
-.Sh ERRORS
-The following errors may be returned by the system calls themselves.
-Additionally, the filesystem implementing the call may return any
-other errors it desires.
-.Bl -tag -width Er
-.It Bq Er EFAULT
-.Fa attrnamespace ,
-.Fa attrname ,
-or the memory range defined by
-.Fa data
-and
-.Fa nbytes
-points outside the process's allocated address space.
-.It Bq Er ENAMETOOLONG
-The attribute name was longer than
-.Dv EXTATTR_MAXNAMELEN .
-.El
-.Pp
-The
-.Fn extattr_get_fd ,
-.Fn extattr_set_fd ,
-and
-.Fn extattr_delete_fd
-functions may also fail if:
-.Bl -tag -width Er
-.It Bq Er EBADF
-The file descriptor referenced by
-.Fa fd
-was invalid.
-.El
-.Pp
-Additionally, the
-.Fn extattr_get_file ,
-.Fn extattr_set_file ,
-and
-.Fn extattr_delete_file
-calls may also fail due to the following errors:
-.Bl -tag -width Er
-.It Bq Er ENOTDIR
-A component of the path prefix is not a directory.
-.It Bq Er ENAMETOOLONG
-A component of a pathname exceeded 255 characters,
-or an entire path name exceeded 1023 characters.
-.It Bq Er ENOENT
-A component of the path name that must exist does not exist.
-.It Bq Er EACCES
-Search permission is denied for a component of the path prefix.
-.It Bq Er ENOATTR
-An attribute does not exist for the specified existing path.
-.\" XXX are any missing?
-.El
-.Sh SEE ALSO
-.Xr extattr 3 ,
-.Xr extattrctl 8 ,
-.Xr getextattr 8 ,
-.Xr setextattr 8 ,
-.Xr extattr 9
-.Sh HISTORY
-Extended attribute support was developed as part of the
-.Tn TrustedBSD
-Project, and introduced in
-.Ox 3.1 .
-It was developed to support security extensions requiring additional labels
-to be associated with each file or directory.
-.Sh CAVEATS
-This interface is under active development, and as such is subject to
-change as applications are adapted to use it.
-Developers are discouraged from relying on its stability.