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EXTATTR(3)	       FreeBSD Library Functions Manual		    EXTATTR(3)

NAME
     extattr_namespace_to_string, extattr_string_to_namespace -- convert an
     extended attribute	namespace identifier to	a string and vice versa

LIBRARY
     System Utilities Library (libutil,	-lutil)

SYNOPSIS
     #include <sys/extattr.h>
     #include <libutil.h>

     int
     extattr_namespace_to_string(int attrnamespace, char **string);

     int
     extattr_string_to_namespace(const char *string, int *attrnamespace);

DESCRIPTION
     The extattr_namespace_to_string() function	converts a VFS extended	attri-
     bute identifier to	a human-readable string; the
     extattr_string_to_namespace() function undoes the aforementioned opera-
     tion, and converts	a human-readable string	representing a namespace to a
     namespace identifier.  Although a file system may implement arbitrary
     namespaces, these functions only support the EXTATTR_NAMESPACE_USER
     ("user") and EXTATTR_NAMESPACE_SYSTEM ("system") namespaces, which	are
     defined in	extattr(9).

     These functions are meant to be used in error reporting and other inter-
     active tasks.  For	example, instead of printing the integer identifying
     an	extended attribute in an error message,	a program might	use
     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
     extattr_string_to_namespace() to get the desired identifier.

RETURN VALUES
     If	any of the calls are unsuccessful, the value -1	is returned and	the
     global variable errno is set to indicate the error.

ERRORS
     [EINVAL]		The requested namespace	could not be identified.

SEE ALSO
     extattr(2), getextattr(8),	setextattr(8), extattr(9)

HISTORY
     Extended attribute	support	was developed as part of the TrustedBSD
     Project, and introduced in	FreeBSD	5.0.  It was developed to support se-
     curity extensions requiring additional labels to be associated with each
     file or directory.

FreeBSD	13.0			 June 24, 2001			  FreeBSD 13.0
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY

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