skb_cow_data - Check that a socket bufferAqs data buffers are writable
2. SYNOPSIS ▲
int skb_cow_data(struct sk_buff * skb , int tailbits , struct sk_buff ** trailer );
3. ARGUMENTS ▲
The socket buffer to check.
Amount of trailing space to be added
Returned pointer to the skb where the tailbits space begins
4. DESCRIPTION ▲
Make 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 COWAqd and extended socket buffer will be returned.
5. COPYRIGHT ▲