C Instrumentation Framework

Feature #3465

Updated by Mikhail Mandrykin about 12 years ago

There are some special marco definitions intended for some specific list or queue traverses. For instance, 
 <pre> 
 #define skb_queue_walk_safe(queue, skb, tmp)                                      \ 
                 for (skb = (queue)->next, tmp = skb->next;                        \ 
                      skb != (struct sk_buff *)(queue);                            \ 
                      skb = tmp, tmp = skb->next) 
 </pre> 
 It's desirable sometimes to have some instructions executed at each iteration of such loops. Here, for example, this macro enables us to detect assignments to @skb@ varaible which is useful in checking for double @skb@ deallocations. 
 <pre> 
 skb_queue_walk_safe(tx_skb_queue, skb, tmp) { 
         if (...) { 
                 ... 
                 kfree_skb(skb); 
         } 
 } 
 </pre>

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