net/core/stream.c

   1 /*
   2  *     SUCS NET3:
   3  *
   4  *     Generic stream handling routines. These are generic for most
   5  *     protocols. Even IP. Tonight 8-).
   6  *     This is used because TCP, LLC (others too) layer all have mostly
   7  *     identical sendmsg() and recvmsg() code.
   8  *     So we (will) share it here.
   9  *
  10  *     Authors:        Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  11  *                     (from old tcp.c code)
  12  *                     Alan Cox <alan@redhat.com> (Borrowed comments 8-))
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/net.h>
  17 #include <linux/signal.h>
  18 #include <linux/wait.h>
  19 #include <net/sock.h>
  20
  21 /**
  22  * sk_stream_write_space - stream socket write_space callback.
  23  * sk - socket
  24  *
  25  * FIXME: write proper description
  26  */
  27 void sk_stream_write_space(struct sock *sk)
  28 {
  29         struct socket *sock = sk->sk_socket;
  30
  31         if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock) {
  32                 clear_bit(SOCK_NOSPACE, &sock->flags);
  33
  34                 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
  35                         wake_up_interruptible(sk->sk_sleep);
  36                 if (sock->fasync_list && !(sk->sk_shutdown & SEND_SHUTDOWN))
  37                         sock_wake_async(sock, 2, POLL_OUT);
  38         }
  39 }
  40
  41 EXPORT_SYMBOL(sk_stream_write_space);