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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
attribute identifier to a human-readable string; the
extattr_string_to_namespace() function undoes the aforementioned
operation, 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
interactive 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
security extensions requiring additional labels to be associated with
each file or directory.
FreeBSD 14.0-RELEASE-p11 June 24, 2001 FreeBSD 14.0-RELEASE-p11