Minix Man Pages

home | help
PROP_DATA(3)             BSD Library Functions Manual             PROP_DATA(3)

NAME
     prop_data, prop_data_create_data, prop_data_create_data_nocopy,
     prop_data_copy, prop_data_size, prop_data_data, prop_data_data_nocopy,
     prop_data_equals, prop_data_equals_data -- opaque data value property
     object

LIBRARY
     Property Container Object Library (libprop, -lprop)

SYNOPSIS
     #include <prop/proplib.h>

     prop_data_t
     prop_data_create_data(const void *blob, size_t len);

     prop_data_t
     prop_data_create_data_nocopy(const void *blob, size_t len);

     prop_data_t
     prop_data_copy(prop_data_t data);

     size_t
     prop_data_size(prop_data_t data);

     void *
     prop_data_data(prop_data_t data);

     const void *
     prop_data_data_nocopy(prop_data_t data);

     bool
     prop_data_equals(prop_data_t dat1, prop_data_t dat2);

     bool
     prop_data_equals_data(prop_data_t data, const void *blob, size_t len);

DESCRIPTION
     The prop_data family of functions operate on an opaque data value
     property object type.

     prop_data_create_data(const void *blob, size_t len)
            Create a data object that contains a copy of blob with size len.
            Returns NULL on failure.

     prop_data_create_data_nocopy(const void *blob, size_t len)
            Create a data object that contains a reference to blob with size
            len.  Returns NULL on failure.

     prop_data_copy(prop_data_t data)
            Copy a data object.  If the data object being copied is an
            external data reference, then the copy also references the same
            external data.  Returns NULL on failure.

     prop_data_size(prop_data_t data)
            Returns the size of the data object.  If the supplied object isn't
            a data object, zero is returned.

     prop_data_data(prop_data_t data)
            Returns a copy of the data object's contents.  The caller is
            responsible for freeing the returned buffer.  If the supplied
            object isn't a data object or if the data container is empty, NULL
            is returned.

            In user space, the buffer is allocated using malloc(3).  In the
            kernel, the buffer is allocated using malloc(9) using the malloc
            type M_TEMP.

     prop_data_data_nocopy(prop_data_t data)
            Returns an immutable reference to the contents of the data object.
            If the supplied object isn't a data object, NULL is returned.

     prop_data_equals(prop_data_t dat1, prop_data_t dat2)
            Returns true if the two data objects are equivalent.  If at least
            one of the supplied objects isn't a data object, false is
            returned.

     prop_data_equals_data(prop_data_t data, const void *blob, size_t len)
            Returns true if the data object's value is equivalent to blob with
            size len.  If the supplied object isn't a data object, false is
            returned.

SEE ALSO
     prop_array(3), prop_bool(3), prop_dictionary(3), prop_number(3),
     prop_object(3), prop_string(3), proplib(3)

HISTORY
     The proplib property container object library first appeared in
     NetBSD 4.0.

BSD                             April 22, 2006                             BSD
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY