DI_PROM_PROP_LOOKUP_BYTES(3DEVINFO) Device Information Library Functions

NAME

di_prom_prop_lookup_bytes, di_prom_prop_lookup_ints,
di_prom_prop_lookup_strings - search for a PROM property

SYNOPSIS

cc [ flag... ] file... -ldevinfo [ library... ]
#include <libdevinfo.h>

int di_prom_prop_lookup_bytes(di_prom_handle_t ph, di_node_t node,
const char *prop_name, uchar_t **prop_data);


int di_prom_prop_lookup_ints(di_prom_handle_t ph, di_node_t node,
const char *prop_name, int **prop_data);


int di_prom_prop_lookup_strings(di_prom_handle_t ph, di_node_t node,
const char *prop_name, char **prop_data);

PARAMETERS

node
Handle to device node in snapshot created by
di_init(3DEVINFO).


ph
Handle returned by di_prom_init(3DEVINFO).


prop_data
For di_prom_prop_lookup_bytes(), the address of a
pointer to an array of unsigned characters.

For di_prom_prop_lookup_ints(), the address of a pointer
to an integer.

For di_prom_prop_lookup_strings(), the address of
pointer to a buffer.


prop_name
The name of the property being searched.

DESCRIPTION

These functions return the value of a known PROM property name and
value type and update the prop_data pointer to reference memory that
contains the property value. All memory allocated by these functions
is managed by the library and must not be freed by the caller.

RETURN VALUES

If the property is found, the number of entries in prop_data is
returned. If the property is a boolean type, 0 is returned and the
existence of this property indicates the value is true. Otherwise, -1
is returned and errno is set to indicate the error.


For di_prom_prop_lookup_bytes(), the number of entries is the number
of unsigned characters contained in the buffer pointed to by
prop_data.


For di_prom_prop_lookup_ints(), the number of entries is the number
of integers contained in the buffer pointed to by prop_data.


For di_prom_prop_lookup_strings(), the number of entries is the
number of null-terminated strings contained in the buffer. The
strings are stored in a concatenated format in the buffer.

ERRORS

These functions will fail if::

EINVAL
Invalid argument.


ENXIO
The property does not exist.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Evolving |
+--------------------+-----------------+
|MT-Level | Safe |
+--------------------+-----------------+

SEE ALSO

di_init(3DEVINFO), di_prom_prop_next(3DEVINFO), libdevinfo(3LIB),
openprom(4D), attributes(7)


Writing Device Drivers

December 1, 1998
DI_PROM_PROP_LOOKUP_BYTES(3DEVINFO)