IDR_FOR_EACH(9) Basic Kernel Library Functions IDR_FOR_EACH(9)NAME
idr_for_each - iterate through all stored pointers
int idr_for_each(struct idr * idp, int (*fn) (int id, void *p, void *data), void * data);
function to be called for each pointer
data passed back to callback function
Iterate over the pointers registered with the given idr. The callback function will be called for each pointer currently registered,
passing the id, the pointer and the data pointer passed to this function. It is not safe to modify the idr tree while in the callback, so
functions such as idr_get_new and idr_remove are not allowed.
We check the return of fn each time. If it returns anything other than 0, we break out and return that value.
The caller must serialize idr_for_each vs idr_get_new and idr_remove.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 IDR_FOR_EACH(9)
Check Out this Related Man Page
CALLBACK(9) BSD Kernel Developer's Manual CALLBACK(9)NAME
callback -- generic callback interface
callback_head_init(struct callback_head *ch, int ipl);
callback_head_destroy(struct callback_head *ch);
callback_register(struct callback_head *ch, struct callback_entry *ce, void *obj, int (*fn)(struct callback_entry *, void *, void *));
callback_unregister(struct callback_head *ch, struct callback_entry *ce);
callback_run_roundrobin(struct callback_head *ch, void *arg);
The generic callback interface allows lower-level layer code to execute a registered function, or set of functions, from the higher-level
Registered functions must return one of these constants:
Indicates that the function call was successful. The following functions in the chain will be called.
Indicates a failure case in the function call. Any following functions in the chain will not be executed.
The callback structure callback_head should be initialized and destroyed using the functions described below. This structure contains the
list of callback entries and other internal data.
The callback_entry structure is an entry, normally associated with the higher-level object. It contains the internal data of the callback
Initialize the callback structure specified by ch. The highest IPL at which this callback can be used is specified by ipl.
Destroy the callback structure specified by ch. The caller must unregister all functions before destroying the callback structure.
callback_register(ch, ce, obj, fn)
Register the callback function in the callback structure specified by ch. ce should point to the entry structure of the callback
object. The callback object itself is specified by obj. The function pointer is specified by fn.
Unregister the callback function from the structure specified by ch. The entry should be passed as ce. This function may block.
Executes all functions registered in the callback structure, specified by ch. The functions are executed in round-robin fashion.
The value of arg will be passed to the callback functions.
The callback interface is implemented within the file sys/kern/subr_callback.c.
SEE ALSO intro(9)BSD October 28, 2009 BSD
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