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ddi_prop_update(9f)
ddi_prop_update(9F) Kernel Functions ddi_prop_update(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 exam‐
ple, 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 prop‐
erty 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 associ‐
ated 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)
Writing Device Drivers in Oracle Solaris 11.4
Oracle Solaris 11.4 28 Aug 2001 ddi_prop_update(9F)