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extattr (3)
  • extattr (2) ( FreeBSD man: Системные вызовы )
  • >> extattr (3) ( FreeBSD man: Библиотечные вызовы )
  • extattr (9) ( FreeBSD man: Ядро )

  • BSD mandoc
     

    NAME

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

    LIBRARY

    Lb libutil
    
     
    

    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

    Bq Er 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 Fx 5.0 . It was developed to support security extensions requiring additional labels to be associated with each file or directory.


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO
    HISTORY


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