Copyright (c) 2001 Dima Dorfman <dd@FreeBSD.org>
Copyright (c) 2011 Emmanuel Dreyfus <manu@NetBSD.org>
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FreeBSD: src/lib/libc/posix1e/extattr.3,v 1.5 2002/12/12 17:25:53 ru Exp
.Dd December 16, 2011 .Dt EXTATTR_NAMESPACE_TO_STRING 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 LIBRARY .Lb libc .Sh SYNOPSIS n 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 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 .Dv EXTATTR_NAMESPACE_USER
q Dq user and .Dv EXTATTR_NAMESPACE_SYSTEM
q Dq system namespaces, which are defined in .Xr extattr 9 .
p 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 l -tag -width Er t Bq Er EINVAL The requested namespace could not be identified. .El .Sh SEE ALSO .Xr getextattr 1 , .Xr extattr_get_file 2 , .Xr extattr_copy_file 3 , .Xr extattr 9 .Sh HISTORY Extended attribute support was developed as part of the .Tn TrustedBSD Project, and introduced in .Fx 5.0 and .Nx 3.0 . It was developed to support security extensions requiring additional labels to be associated with each file or directory.