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EXTATTR(3) Library Functions Manual EXTATTR(3)

extattr_namespace_to_string, extattr_string_to_namespaceconvert an extended attribute namespace identifier to a string and vice versa

library “libutil”

#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);

The () function converts a VFS extended attribute identifier to a human-readable string; the () 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 () 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 () to get the desired identifier.

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

[]
The requested namespace could not be identified.

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

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.

June 24, 2001 FreeBSD-12.0