centos man page for sk_wait_data

SK_WAIT_DATA(9) 						 Linux Networking						   SK_WAIT_DATA(9)

NAME
       sk_wait_data - wait for data to arrive at sk_receive_queue

SYNOPSIS
       int sk_wait_data(struct sock * sk, long * timeo);

ARGUMENTS
       sk
	   sock to wait on

       timeo
	   for how long

DESCRIPTION
       Now socket state including sk->sk_err is changed only under lock, hence we may omit checks after joining wait queue. We check receive queue
       before schedule only as optimization; it is very likely that release_sock added new data.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							   SK_WAIT_DATA(9)