SKB_COW_DATA - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Linux Networking

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NAMEskb_cow_data − Check that a socket buffer´s data buffers are writable

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SYNOPSISint skb_cow_data(struct sk_buff * skb, int tailbits, struct sk_buff ** trailer);

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ARGUMENTSskb The socket buffer to check​. tailbits Amount of trailing space to be added trailer Returned pointer to the skb where the tailbits space begins

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DESCRIPTIONMake sure that the data buffers attached to a socket buffer are writable​. If they are not, private copies are made of the data buffers and the socket buffer is set to use these instead​. If tailbits is given, make sure that there is space to write tailbits bytes of data beyond current end of socket buffer​. trailer will be set to point to the skb in which this space begins​. The number of scatterlist elements required to completely map the COW´d and extended socket buffer will be returned​.

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