EXTATTR_NAMESPACE_TO_... BSD Library Functions Manual EXTATTR_NAMESPACE_TO_...NAME
extattr_namespace_to_string, extattr_string_to_namespace — convert an
extended attribute namespace identifier to a string and vice versa
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/extattr.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() converts a human-readable string represent‐
ing 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 ALSOgetextattr(1), extattr_get_file(2), extattr_copy_file(3), extattr(9)HISTORY
Extended attribute support was developed as part of the TrustedBSD
Project, and introduced in FreeBSD 5.0 and NetBSD 3.0. It was developed
to support security extensions requiring additional labels to be associ‐
ated with each file or directory.
BSD December 16, 2011 BSD
