Manual Pages  — BUS_GET_PROPERTY

BUS_GET_PROPERTY – get child's specific property

SYNOPSIS DESCRIPTION NOTES RETURN VALUES SEE ALSO AUTHORS

#include <sys/param.h>

#include <sys/bus.h>

ssize_t
BUS_GET_PROPERTY(device_t dev, device_t child, const char *propname);

"void *propvalue" "size_t size" "device_property_type_t type"

The BUS_GET_PROPERTY() method is called from driver code which wants to access a child's specific data stored on the bus. A property has a name and an associated value. Implementation shall copy to propvalue at most size bytes.

BUS_GET_PROPERTY() supports different property types specified via the type argument. The size is guaranteed to be a multiple of the underlying property type. If a type is not supported, BUS_GET_PROPERTY() shall return -1.

If propvalue is NULL or size is zero, the implementation shall return only the size of the property.

The property size if successful, otherwise -1.

This manual page was written by Bartlomiej Grzesik.