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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@lxorguk.ukuu.org.uk> (Borrowed comments 8-)) |
13 | */ |
14 | |
15 | #include <linux/module.h> |
16 | #include <linux/net.h> |
17 | #include <linux/signal.h> |
18 | #include <linux/tcp.h> |
19 | #include <linux/wait.h> |
20 | #include <net/sock.h> |
21 | |
22 | /** |
23 | * sk_stream_write_space - stream socket write_space callback. |
24 | * @sk: socket |
25 | * |
26 | * FIXME: write proper description |
27 | */ |
28 | void sk_stream_write_space(struct sock *sk) |
29 | { |
30 | struct socket *sock = sk->sk_socket; |
31 | |
32 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock) { |
33 | clear_bit(SOCK_NOSPACE, &sock->flags); |
34 | |
35 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
36 | wake_up_interruptible_poll(sk->sk_sleep, POLLOUT | |
37 | POLLWRNORM | POLLWRBAND); |
38 | if (sock->fasync_list && !(sk->sk_shutdown & SEND_SHUTDOWN)) |
39 | sock_wake_async(sock, SOCK_WAKE_SPACE, POLL_OUT); |
40 | } |
41 | } |
42 | |
43 | EXPORT_SYMBOL(sk_stream_write_space); |
44 | |
45 | /** |
46 | * sk_stream_wait_connect - Wait for a socket to get into the connected state |
47 | * @sk: sock to wait on |
48 | * @timeo_p: for how long to wait |
49 | * |
50 | * Must be called with the socket locked. |
51 | */ |
52 | int sk_stream_wait_connect(struct sock *sk, long *timeo_p) |
53 | { |
54 | struct task_struct *tsk = current; |
55 | DEFINE_WAIT(wait); |
56 | int done; |
57 | |
58 | do { |
59 | int err = sock_error(sk); |
60 | if (err) |
61 | return err; |
62 | if ((1 << sk->sk_state) & ~(TCPF_SYN_SENT | TCPF_SYN_RECV)) |
63 | return -EPIPE; |
64 | if (!*timeo_p) |
65 | return -EAGAIN; |
66 | if (signal_pending(tsk)) |
67 | return sock_intr_errno(*timeo_p); |
68 | |
69 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
70 | sk->sk_write_pending++; |
71 | done = sk_wait_event(sk, timeo_p, |
72 | !sk->sk_err && |
73 | !((1 << sk->sk_state) & |
74 | ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))); |
75 | finish_wait(sk->sk_sleep, &wait); |
76 | sk->sk_write_pending--; |
77 | } while (!done); |
78 | return 0; |
79 | } |
80 | |
81 | EXPORT_SYMBOL(sk_stream_wait_connect); |
82 | |
83 | /** |
84 | * sk_stream_closing - Return 1 if we still have things to send in our buffers. |
85 | * @sk: socket to verify |
86 | */ |
87 | static inline int sk_stream_closing(struct sock *sk) |
88 | { |
89 | return (1 << sk->sk_state) & |
90 | (TCPF_FIN_WAIT1 | TCPF_CLOSING | TCPF_LAST_ACK); |
91 | } |
92 | |
93 | void sk_stream_wait_close(struct sock *sk, long timeout) |
94 | { |
95 | if (timeout) { |
96 | DEFINE_WAIT(wait); |
97 | |
98 | do { |
99 | prepare_to_wait(sk->sk_sleep, &wait, |
100 | TASK_INTERRUPTIBLE); |
101 | if (sk_wait_event(sk, &timeout, !sk_stream_closing(sk))) |
102 | break; |
103 | } while (!signal_pending(current) && timeout); |
104 | |
105 | finish_wait(sk->sk_sleep, &wait); |
106 | } |
107 | } |
108 | |
109 | EXPORT_SYMBOL(sk_stream_wait_close); |
110 | |
111 | /** |
112 | * sk_stream_wait_memory - Wait for more memory for a socket |
113 | * @sk: socket to wait for memory |
114 | * @timeo_p: for how long |
115 | */ |
116 | int sk_stream_wait_memory(struct sock *sk, long *timeo_p) |
117 | { |
118 | int err = 0; |
119 | long vm_wait = 0; |
120 | long current_timeo = *timeo_p; |
121 | DEFINE_WAIT(wait); |
122 | |
123 | if (sk_stream_memory_free(sk)) |
124 | current_timeo = vm_wait = (net_random() % (HZ / 5)) + 2; |
125 | |
126 | while (1) { |
127 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
128 | |
129 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
130 | |
131 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) |
132 | goto do_error; |
133 | if (!*timeo_p) |
134 | goto do_nonblock; |
135 | if (signal_pending(current)) |
136 | goto do_interrupted; |
137 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
138 | if (sk_stream_memory_free(sk) && !vm_wait) |
139 | break; |
140 | |
141 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
142 | sk->sk_write_pending++; |
143 | sk_wait_event(sk, ¤t_timeo, !sk->sk_err && |
144 | !(sk->sk_shutdown & SEND_SHUTDOWN) && |
145 | sk_stream_memory_free(sk) && |
146 | vm_wait); |
147 | sk->sk_write_pending--; |
148 | |
149 | if (vm_wait) { |
150 | vm_wait -= current_timeo; |
151 | current_timeo = *timeo_p; |
152 | if (current_timeo != MAX_SCHEDULE_TIMEOUT && |
153 | (current_timeo -= vm_wait) < 0) |
154 | current_timeo = 0; |
155 | vm_wait = 0; |
156 | } |
157 | *timeo_p = current_timeo; |
158 | } |
159 | out: |
160 | finish_wait(sk->sk_sleep, &wait); |
161 | return err; |
162 | |
163 | do_error: |
164 | err = -EPIPE; |
165 | goto out; |
166 | do_nonblock: |
167 | err = -EAGAIN; |
168 | goto out; |
169 | do_interrupted: |
170 | err = sock_intr_errno(*timeo_p); |
171 | goto out; |
172 | } |
173 | |
174 | EXPORT_SYMBOL(sk_stream_wait_memory); |
175 | |
176 | int sk_stream_error(struct sock *sk, int flags, int err) |
177 | { |
178 | if (err == -EPIPE) |
179 | err = sock_error(sk) ? : -EPIPE; |
180 | if (err == -EPIPE && !(flags & MSG_NOSIGNAL)) |
181 | send_sig(SIGPIPE, current, 0); |
182 | return err; |
183 | } |
184 | |
185 | EXPORT_SYMBOL(sk_stream_error); |
186 | |
187 | void sk_stream_kill_queues(struct sock *sk) |
188 | { |
189 | /* First the read buffer. */ |
190 | __skb_queue_purge(&sk->sk_receive_queue); |
191 | |
192 | /* Next, the error queue. */ |
193 | __skb_queue_purge(&sk->sk_error_queue); |
194 | |
195 | /* Next, the write queue. */ |
196 | WARN_ON(!skb_queue_empty(&sk->sk_write_queue)); |
197 | |
198 | /* Account for returned memory. */ |
199 | sk_mem_reclaim(sk); |
200 | |
201 | WARN_ON(sk->sk_wmem_queued); |
202 | WARN_ON(sk->sk_forward_alloc); |
203 | |
204 | /* It is _impossible_ for the backlog to contain anything |
205 | * when we get here. All user references to this socket |
206 | * have gone away, only the net layer knows can touch it. |
207 | */ |
208 | } |
209 | |
210 | EXPORT_SYMBOL(sk_stream_kill_queues); |
211 |
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