TutTimeChangeCbLookup

Name

TutTimeChangeCbLookup — look up a time change callback

Synopsis

T_CB TutTimeChangeCbLookup(func, arg) 
T_TIME_CHANGE_CB_FUNC func; 
T_PTR arg; 

Arguments

func — time change callback function to be looked up

arg — argument to be passed to the callback function

Return Values

Returns pointer to callback if successful, NULL otherwise.

Diagnostics

None

Description

TutTimeChangeCbLookup looks up a time change callback based on func and arg. It returns the callback that exists using the specified callback function and argument.

Caution

None

See Also

TutTimeChangeCbCreate, TutSetCurrentTime, TutSetCurrentTimeStruct

Examples

This example creates a time change callback and then looks it up to verify that the function is working properly:

void T_ENTRY time_change_cb(dummy, data, arg) 
T_PTR dummy; /* not used */ 
T_TIME_CHANGE_CB_DATA data; 
T_PTR arg; 
{ 
  TutOut("Data time is: %d.%06d\n", 
       data->time->sec, data->time->usec); 
} 
 
T_CB created_cb; 
T_CB found_cb; 
created_cb = TutTimeChangeCbCreate(time_change_cb, NULL); 
if (created_cb == NULL) { 
  /* error */ 
} 
 
found_cb = TutTimeChangeCbLookup(time_change_cb, NULL); 
if (found_cb != created_cb) { 
  /* error */ 
}