forked from Minki/linux
a9a08845e9
This is the mindless scripted replacement of kernel use of POLL*
variables as described by Al, done by this script:
for V in IN OUT PRI ERR RDNORM RDBAND WRNORM WRBAND HUP RDHUP NVAL MSG; do
L=`git grep -l -w POLL$V | grep -v '^t' | grep -v /um/ | grep -v '^sa' | grep -v '/poll.h$'|grep -v '^D'`
for f in $L; do sed -i "-es/^\([^\"]*\)\(\<POLL$V\>\)/\\1E\\2/" $f; done
done
with de-mangling cleanups yet to come.
NOTE! On almost all architectures, the EPOLL* constants have the same
values as the POLL* constants do. But they keyword here is "almost".
For various bad reasons they aren't the same, and epoll() doesn't
actually work quite correctly in some cases due to this on Sparc et al.
The next patch from Al will sort out the final differences, and we
should be all done.
Scripted-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
214 lines
5.3 KiB
C
214 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* SUCS NET3:
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*
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* Generic stream handling routines. These are generic for most
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* protocols. Even IP. Tonight 8-).
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* This is used because TCP, LLC (others too) layer all have mostly
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* identical sendmsg() and recvmsg() code.
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* So we (will) share it here.
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*
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* Authors: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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* (from old tcp.c code)
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* Alan Cox <alan@lxorguk.ukuu.org.uk> (Borrowed comments 8-))
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*/
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#include <linux/module.h>
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#include <linux/sched/signal.h>
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#include <linux/net.h>
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#include <linux/signal.h>
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#include <linux/tcp.h>
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#include <linux/wait.h>
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#include <net/sock.h>
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/**
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* sk_stream_write_space - stream socket write_space callback.
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* @sk: socket
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*
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* FIXME: write proper description
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*/
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void sk_stream_write_space(struct sock *sk)
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{
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struct socket *sock = sk->sk_socket;
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struct socket_wq *wq;
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if (sk_stream_is_writeable(sk) && sock) {
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clear_bit(SOCK_NOSPACE, &sock->flags);
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rcu_read_lock();
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wq = rcu_dereference(sk->sk_wq);
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if (skwq_has_sleeper(wq))
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wake_up_interruptible_poll(&wq->wait, EPOLLOUT |
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EPOLLWRNORM | EPOLLWRBAND);
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if (wq && wq->fasync_list && !(sk->sk_shutdown & SEND_SHUTDOWN))
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sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
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rcu_read_unlock();
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}
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}
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/**
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* sk_stream_wait_connect - Wait for a socket to get into the connected state
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* @sk: sock to wait on
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* @timeo_p: for how long to wait
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*
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* Must be called with the socket locked.
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*/
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int sk_stream_wait_connect(struct sock *sk, long *timeo_p)
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{
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DEFINE_WAIT_FUNC(wait, woken_wake_function);
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struct task_struct *tsk = current;
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int done;
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do {
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int err = sock_error(sk);
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if (err)
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return err;
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if ((1 << sk->sk_state) & ~(TCPF_SYN_SENT | TCPF_SYN_RECV))
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return -EPIPE;
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if (!*timeo_p)
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return -EAGAIN;
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if (signal_pending(tsk))
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return sock_intr_errno(*timeo_p);
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add_wait_queue(sk_sleep(sk), &wait);
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sk->sk_write_pending++;
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done = sk_wait_event(sk, timeo_p,
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!sk->sk_err &&
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!((1 << sk->sk_state) &
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~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)), &wait);
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remove_wait_queue(sk_sleep(sk), &wait);
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sk->sk_write_pending--;
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} while (!done);
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return 0;
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}
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EXPORT_SYMBOL(sk_stream_wait_connect);
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/**
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* sk_stream_closing - Return 1 if we still have things to send in our buffers.
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* @sk: socket to verify
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*/
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static inline int sk_stream_closing(struct sock *sk)
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{
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return (1 << sk->sk_state) &
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(TCPF_FIN_WAIT1 | TCPF_CLOSING | TCPF_LAST_ACK);
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}
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void sk_stream_wait_close(struct sock *sk, long timeout)
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{
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if (timeout) {
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DEFINE_WAIT_FUNC(wait, woken_wake_function);
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add_wait_queue(sk_sleep(sk), &wait);
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do {
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if (sk_wait_event(sk, &timeout, !sk_stream_closing(sk), &wait))
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break;
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} while (!signal_pending(current) && timeout);
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remove_wait_queue(sk_sleep(sk), &wait);
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}
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}
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EXPORT_SYMBOL(sk_stream_wait_close);
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/**
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* sk_stream_wait_memory - Wait for more memory for a socket
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* @sk: socket to wait for memory
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* @timeo_p: for how long
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*/
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int sk_stream_wait_memory(struct sock *sk, long *timeo_p)
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{
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int err = 0;
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long vm_wait = 0;
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long current_timeo = *timeo_p;
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bool noblock = (*timeo_p ? false : true);
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DEFINE_WAIT_FUNC(wait, woken_wake_function);
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if (sk_stream_memory_free(sk))
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current_timeo = vm_wait = (prandom_u32() % (HZ / 5)) + 2;
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add_wait_queue(sk_sleep(sk), &wait);
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while (1) {
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sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
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if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
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goto do_error;
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if (!*timeo_p) {
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if (noblock)
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set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
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goto do_nonblock;
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}
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if (signal_pending(current))
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goto do_interrupted;
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sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
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if (sk_stream_memory_free(sk) && !vm_wait)
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break;
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set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
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sk->sk_write_pending++;
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sk_wait_event(sk, ¤t_timeo, sk->sk_err ||
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(sk->sk_shutdown & SEND_SHUTDOWN) ||
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(sk_stream_memory_free(sk) &&
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!vm_wait), &wait);
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sk->sk_write_pending--;
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if (vm_wait) {
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vm_wait -= current_timeo;
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current_timeo = *timeo_p;
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if (current_timeo != MAX_SCHEDULE_TIMEOUT &&
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(current_timeo -= vm_wait) < 0)
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current_timeo = 0;
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vm_wait = 0;
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}
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*timeo_p = current_timeo;
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}
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out:
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remove_wait_queue(sk_sleep(sk), &wait);
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return err;
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do_error:
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err = -EPIPE;
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goto out;
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do_nonblock:
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err = -EAGAIN;
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goto out;
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do_interrupted:
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err = sock_intr_errno(*timeo_p);
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goto out;
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}
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EXPORT_SYMBOL(sk_stream_wait_memory);
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int sk_stream_error(struct sock *sk, int flags, int err)
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{
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if (err == -EPIPE)
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err = sock_error(sk) ? : -EPIPE;
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if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
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send_sig(SIGPIPE, current, 0);
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return err;
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}
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EXPORT_SYMBOL(sk_stream_error);
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void sk_stream_kill_queues(struct sock *sk)
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{
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/* First the read buffer. */
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__skb_queue_purge(&sk->sk_receive_queue);
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/* Next, the error queue. */
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__skb_queue_purge(&sk->sk_error_queue);
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/* Next, the write queue. */
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WARN_ON(!skb_queue_empty(&sk->sk_write_queue));
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/* Account for returned memory. */
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sk_mem_reclaim(sk);
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WARN_ON(sk->sk_wmem_queued);
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WARN_ON(sk->sk_forward_alloc);
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/* It is _impossible_ for the backlog to contain anything
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* when we get here. All user references to this socket
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* have gone away, only the net layer knows can touch it.
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*/
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}
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EXPORT_SYMBOL(sk_stream_kill_queues);
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