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ddi_prop_get_int(9f)
ddi_prop_get_int(9F) Kernel Functions ddi_prop_get_int(9F)
NAME
ddi_prop_get_int, ddi_prop_get_int64 - lookup integer property
SYNOPSIS
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_prop_get_int(dev_t match_dev, dev_info_t *dip, uint_t flags,
char *name, int defvalue);
int64_t ddi_prop_get_int64(dev_t match_dev, dev_info_t *dip, uint_t flags,
char *name, int64_t defvalue);
PARAMETERS
match_dev
Device number associated with property or DDI_DEV_T_ANY.
dip
Pointer to the device info node of device whose property list
should be searched.
flags
Possible flag values are some combination of:
DDI_PROP_DONTPASS Do not pass request to parent device informa‐
tion node if property not found.
DDI_PROP_NOTPROM Do not look at PROM properties (ignored on
platforms that do not support PROM proper‐
ties).
name
String containing the name of the property.
defvalue
An integer value that is returned if the property cannot be found.
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI).
DESCRIPTION
The ddi_prop_get_int() and ddi_prop_get_int64() functions search for an
integer property and, if found, returns the value of the property.
Properties are searched for based on the dip, name, match_dev, and the
type of the data (integer).
The property search order is as follows:
1. Search software properties created by the driver.
2. Search the software properties created by the system (or
nexus nodes in the device info tree).
3. Search the driver global properties list.
4. If DDI_PROP_NOTPROM is not set, search the PROM properties
(if they exist).
5. If DDI_PROP_DONTPASS is not set, pass this request to the
parent device information node.
6. Return defvalue.
Usually, the match_dev argument should be set to the actual device num‐
ber that this property is associated with. However, if the match_dev
argument is DDI_DEV_T_ANY, then ddi_prop_get_int() and ddi_prop_get_int
() will match the request regardless of the match_dev the property was
created with. If a property was created with match_dev set to
DDI_DEV_T_NONE, then the only way to look up this property is with a
match_dev set to DDI_DEV_T_ANY. PROM properties are always created
with match_dev set to DDI_DEV_T_NONE.
name must always be set to the name of the property being looked up.
The return value of the routine is the value of the property. If the
property is not found, the argument defvalue is returned as the value
of the property.
ddi_prop_get_int64() will not search the PROM for 64-bit property val‐
ues.
RETURN VALUES
ddi_prop_get_int() and ddi_prop_get_int64() return the value of the
property. If the property is not found, the argument defvalue is
returned. If the property is found, but cannot be decoded into an int
or an int64, then DDI_PROP_NOT_FOUND is returned.
CONTEXT
ddi_prop_get_int() and ddi_prop_get_int64() can be called from user or
kernel context.
EXAMPLES
Example 1 Using ddi_prop_get_int()
The following example demonstrates the use of ddi_prop_get_int().
/*
* Get the value of the integer "width" property, using
* our own default if no such property exists
*/
width = ddi_prop_get_int(xx_dev, xx_dip, 0, "width",
XX_DEFAULT_WIDTH);
SEE ALSO
ddi_prop_exists(9F), ddi_prop_lookup(9F), ddi_prop_remove(9F),
ddi_prop_update(9F)
Writing Device Drivers in Oracle Solaris 11.4
Oracle Solaris 11.4 25 Aug 2001 ddi_prop_get_int(9F)