SKB_COW_DATA(9) Linux Networking SKB_COW_DATA(9)
NAME
skb_cow_data - Check that a socket buffer's data buffers are writable
SYNOPSIS
int skb_cow_data(struct sk_buff * skb, int tailbits, struct sk_buff ** trailer);
ARGUMENTS
skb
The socket buffer to check.
tailbits
Amount of trailing space to be added
trailer
Returned pointer to the skb where the tailbits space begins
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 COW'd and extended socket buffer will be returned.
COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 SKB_COW_DATA(9)
