man pages section 9: DDI and DKI Kernel Functions

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Updated: July 2014
 
 

ddi_prop_update_byte_array(9F)

Name

ddi_prop_update, ddi_prop_update_int_array, ddi_prop_update_int, ddi_prop_update_string_array, ddi_prop_update_int64, ddi_prop_update_int64_array, ddi_prop_update_string, ddi_prop_update_byte_array - update properties

Synopsis

#include <sys/ddi.h>
#include <sys/sunddi.h>

int ddi_prop_update_int_array(dev_t dev, dev_info_t *dip, 
     char *name, int *data, uint_t nelements);
int ddi_prop_update_int(dev_t dev, dev_info_t *dip, char *name, 
     int data);
int ddi_prop_update_int64_array(dev_t dev, dev_info_t *dip, char *name,
     int64_t *data, uint_t nelements);
int ddi_prop_update_int64(dev_t dev, dev_info_t *dip, char *name, 
     int64_t data);
int ddi_prop_update_string_array(dev_t dev, dev_info_t *dip, char *name,
     char **data, uint_t nelements);
int ddi_prop_update_string(dev_t dev, dev_info_t *dip, char *name, 
     char *data);
int ddi_prop_update_byte_array(dev_t dev, dev_info_t *dip, char *name,
     uchar_t *data, uint_t nelements);

Parameters

dev

Device number associated with the device.

dip

Pointer to the device info node of device whose property list should be updated.

name

String containing the name of the property to be updated.

nelements

The number of elements contained in the memory pointed at by data.

ddi_prop_update_int_array()

data

A pointer an integer array with which to update the property.

ddi_prop_update_int()

data

An integer value with which to update the property.

ddi_prop_update_int64_array()

data

An pointer to a 64-bit integer array with which to update the property.

ddi_prop_update_int64()

data

A 64-bit integer value with which to update the property.

ddi_prop_update_string_array()

data

A pointer to a string array with which to update the property. The array of strings is formatted as an array of pointers to NULL terminated strings, much like the argv argument to execve(2).

ddi_prop_update_string()

data

A pointer to a string value with which to update the property.

ddi_prop_update_byte_array()

data

A pointer to a byte array with which to update the property.

Interface Level

Solaris DDI specific (Solaris DDI).

Description

The property update routines search for and, if found, modify the value of a given property. Properties are searched for based on the dip, name, dev, and the type of the data (integer, string, or byte). The driver software properties list is searched. If the property is found, it is updated with the supplied value. If the property is not found on this list, a new property is created with the value supplied. For example, if a driver attempts to update the "foo" property, a property named "foo" is searched for on the driver's software property list. If "foo" is found, the value is updated. If "foo" is not found, a new property named "foo" is created on the driver's software property list with the supplied value even if a "foo" property exists on another property list (such as a PROM property list).

Every property value has a data type associated with it: byte, integer, or string. A property should be updated using a function with the same corresponding data type as the property value. For example, an integer property must be updated using either ddi_prop_update_int_array() or ddi_prop_update_int(). For a 64-bit integer, you must use ddi_prop_update_int64_array() or ddi_prop_update_int64(). Attempts to update a property with a function that does not correspond to the property data type that was used to create it results in an undefined state.

Usually, the dev argument should be set to the actual device number that this property is associated with. If the property is not associated with any particular dev, then the argument dev should be set to DDI_DEV_T_NONE. This property will then match a look up request (see ddi_prop_lookup(9F)) with the match_dev argument set to DDI_DEV_T_ANY. If no dev is available for the device (for example during attach(9E) time), one can be created using makedevice(9F) with a major number of DDI_MAJOR_T_UNKNOWN. The update routines will then generate the correct dev when creating or updating the property.

name must always be set to the name of the property being updated.

For the routines ddi_prop_update_int_array( ), ddi_prop_lookup_int64_array(), ddi_prop_update_string_array( ), ddi_prop_update_string( ), and ddi_prop_update_byte_array( ), data is a pointer which points to memory containing the value of the property. In each case *data points to a different type of property value. See the individual descriptions of the routines below for details concerning the different values. nelements is an unsigned integer which contains the number of integer, string, or byte elements accounted for in the memory pointed at by *data.

For the routines ddi_prop_update_int() and ddi_prop_update_int64(), data is the new value of the property.

ddi_prop_update_int_array()

Updates or creates an array of integer property values. An array of integers is defined to be nelements of 4 byte long integer elements. data must be a pointer to an integer array with which to update the property.

ddi_prop_update_int()

Update or creates a single integer value of a property. data must be an integer value with which to update the property.

ddi_prop_update_int64_array()

Updates or creates an array of 64-bit integer property values. An array of integers is defined to be nelements of int64_t integer elements. data must be a pointer to a 64-bit integer array with which to update the property.

ddi_prop_update_int64()

Updates or creates a single 64-bit integer value of a property. data must be an int64_t value with which to update the property.

ddi_prop_update_string_array()

Updates or creates a property that is an array of strings. data must be a pointer to a string array with which to update the property. The array of strings is formatted as an array of pointers to NULLterminated strings, much like the argv argument to execve(2).

ddi_prop_update_string()

Updates or creates a property that is a single string value. data must be a pointer to a string with which to update the property.

ddi_prop_update_byte_array()

Updates or creates a property that is an array of bytes. data should be a pointer to a byte array with which to update the property.

The property update routines may block to allocate memory needed to hold the value of the property.

Return Values

All of the property update routines return:

DDI_PROP_SUCCESS

On success.

DDI_PROP_INVAL_ARG

If an attempt is made to update a property with name set to NULL or name set to the null string.

DDI_PROP_CANNOT_ENCODE

If the bytes of the property cannot be encoded.

Context

These functions can only be called from user or kernel context.

Examples

Example 1 Updating Properties

The following example demonstrates the use of ddi_prop_update_int_array().

int	options[4];

	/*
	 * Create the "options" integer array with
	 * our default values for these parameters
	 */
	options[0] = XX_OPTIONS0;
	options[1] = XX_OPTIONS1;
	options[2] = XX_OPTIONS2;
	options[3] = XX_OPTIONS3;
	i = ddi_prop_update_int_array(xx_dev, xx_dip, "options",
		&options, sizeof (options) / sizeof (int));

See Also

execve(2), attach(9E), ddi_prop_lookup(9F), ddi_prop_remove(9F), makedevice(9F)

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