1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9 #include <ngx_event.h>
10
11
12 /* the buffer size is enough to hold "struct sockaddr_un" */
13 #define NGX_SOCKLEN 512
14
15
16 static ngx_int_t ngx_enable_accept_events(ngx_cycle_t *cycle);
17 static ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle);
18 static void ngx_close_accepted_connection(ngx_connection_t *c);
19
20
21 void
22 ngx_event_accept(ngx_event_t *ev)
23 {
24 socklen_t socklen;
25 ngx_err_t err;
26 ngx_log_t *log;
27 ngx_socket_t s;
28 ngx_event_t *rev, *wev;
29 ngx_listening_t *ls;
30 ngx_connection_t *c, *lc;
31 ngx_event_conf_t *ecf;
32 char sa[NGX_SOCKLEN];
33
34 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
35
36 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
37 ev->available = 1;
38
39 } else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
40 ev->available = ecf->multi_accept;
41 }
42
43 lc = ev->data;
44 ls = lc->listening;
45 ev->ready = 0;
46
47 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
48 "accept on %V, ready: %d", &ls->addr_text, ev->available);
49
50 do {
51 socklen = NGX_SOCKLEN;
52
53 s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
54
55 if (s == -1) {
56 err = ngx_socket_errno;
57
58 if (err == NGX_EAGAIN) {
59 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err,
60 "accept() not ready");
61 return;
62 }
63
64 ngx_log_error((err == NGX_ECONNABORTED) ? NGX_LOG_ERR:
65 NGX_LOG_ALERT,
66 ev->log, err, "accept() failed");
67
68 if (err == NGX_ECONNABORTED) {
69 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
70 ev->available--;
71 }
72
73 if (ev->available) {
74 continue;
75 }
76 }
77
78 return;
79 }
80
81 #if (NGX_STAT_STUB)
82 ngx_atomic_fetch_add(ngx_stat_accepted, 1);
83 #endif
84
85 ngx_accept_disabled = NGX_ACCEPT_THRESHOLD
86 - ngx_cycle->free_connection_n;
87
88 c = ngx_get_connection(s, ev->log);
89
90 if (c == NULL) {
91 if (ngx_close_socket(s) == -1) {
92 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
93 ngx_close_socket_n " failed");
94 }
95
96 return;
97 }
98
99 #if (NGX_STAT_STUB)
100 ngx_atomic_fetch_add(ngx_stat_active, 1);
101 #endif
102
103 c->pool = ngx_create_pool(ls->pool_size, ev->log);
104 if (c->pool == NULL) {
105 ngx_close_accepted_connection(c);
106 return;
107 }
108
109 c->sockaddr = ngx_palloc(c->pool, socklen);
110 if (c->sockaddr == NULL) {
111 ngx_close_accepted_connection(c);
112 return;
113 }
114
115 ngx_memcpy(c->sockaddr, sa, socklen);
116
117 log = ngx_palloc(c->pool, sizeof(ngx_log_t));
118 if (log == NULL) {
119 ngx_close_accepted_connection(c);
120 return;
121 }
122
123 /* set a blocking mode for aio and non-blocking mode for others */
124
125 if (ngx_inherited_nonblocking) {
126 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
127 if (ngx_blocking(s) == -1) {
128 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
129 ngx_blocking_n " failed");
130 ngx_close_accepted_connection(c);
131 return;
132 }
133 }
134
135 } else {
136 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
137 if (ngx_nonblocking(s) == -1) {
138 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
139 ngx_nonblocking_n " failed");
140 ngx_close_accepted_connection(c);
141 return;
142 }
143 }
144 }
145
146 *log = ls->log;
147
148 c->recv = ngx_recv;
149 c->send = ngx_send;
150 c->recv_chain = ngx_recv_chain;
151 c->send_chain = ngx_send_chain;
152
153 c->log = log;
154 c->pool->log = log;
155
156 c->listening = ls;
157 c->socklen = socklen;
158
159 c->unexpected_eof = 1;
160
161 rev = c->read;
162 wev = c->write;
163
164 wev->ready = 1;
165
166 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
167 /* rtsig, aio, iocp */
168 rev->ready = 1;
169 }
170
171 if (ev->deferred_accept) {
172 rev->ready = 1;
173 #if (NGX_HAVE_KQUEUE)
174 rev->available = 1;
175 #endif
176 }
177
178 rev->log = log;
179 wev->log = log;
180
181 /*
182 * TODO: MT: - ngx_atomic_fetch_add()
183 * or protection by critical section or light mutex
184 *
185 * TODO: MP: - allocated in a shared memory
186 * - ngx_atomic_fetch_add()
187 * or protection by critical section or light mutex
188 */
189
190 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
191
192 #if (NGX_STAT_STUB)
193 ngx_atomic_fetch_add(ngx_stat_handled, 1);
194 #endif
195
196 #if (NGX_THREADS)
197 rev->lock = &c->lock;
198 wev->lock = &c->lock;
199 rev->own_lock = &c->lock;
200 wev->own_lock = &c->lock;
201 #endif
202
203 if (ls->addr_ntop) {
204 c->addr_text.data = ngx_palloc(c->pool, ls->addr_text_max_len);
205 if (c->addr_text.data == NULL) {
206 ngx_close_accepted_connection(c);
207 return;
208 }
209
210 c->addr_text.len = ngx_sock_ntop(ls->family, c->sockaddr,
211 c->addr_text.data,
212 ls->addr_text_max_len);
213 if (c->addr_text.len == 0) {
214 ngx_close_accepted_connection(c);
215 return;
216 }
217 }
218
219 #if (NGX_DEBUG)
220 {
221
222 in_addr_t i;
223 ngx_event_debug_t *dc;
224 struct sockaddr_in *sin;
225
226 sin = (struct sockaddr_in *) sa;
227 dc = ecf->debug_connection.elts;
228 for (i = 0; i < ecf->debug_connection.nelts; i++) {
229 if ((sin->sin_addr.s_addr & dc[i].mask) == dc[i].addr) {
230 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
231 break;
232 }
233 }
234
235 }
236 #endif
237
238 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
239 "*%d accept: %V fd:%d", c->number, &c->addr_text, s);
240
241 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
242 if (ngx_add_conn(c) == NGX_ERROR) {
243 ngx_close_accepted_connection(c);
244 return;
245 }
246 }
247
248 log->data = NULL;
249 log->handler = NULL;
250
251 ls->handler(c);
252
253 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
254 ev->available--;
255 }
256
257 } while (ev->available);
258 }
259
260
261 ngx_int_t
262 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
263 {
264 if (ngx_shmtx_trylock(&ngx_accept_mutex)) {
265
266 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
267 "accept mutex locked");
268
269 if (ngx_accept_mutex_held
270 && ngx_accept_events == 0
271 && !(ngx_event_flags & NGX_USE_RTSIG_EVENT))
272 {
273 return NGX_OK;
274 }
275
276 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
277 ngx_shmtx_unlock(&ngx_accept_mutex);
278 return NGX_ERROR;
279 }
280
281 ngx_accept_events = 0;
282 ngx_accept_mutex_held = 1;
283
284 return NGX_OK;
285 }
286
287 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
288 "accept mutex lock failed: %ui", ngx_accept_mutex_held);
289
290 if (ngx_accept_mutex_held) {
291 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
292 return NGX_ERROR;
293 }
294
295 ngx_accept_mutex_held = 0;
296 }
297
298 return NGX_OK;
299 }
300
301
302 static ngx_int_t
303 ngx_enable_accept_events(ngx_cycle_t *cycle)
304 {
305 ngx_uint_t i;
306 ngx_listening_t *ls;
307 ngx_connection_t *c;
308
309 ls = cycle->listening.elts;
310 for (i = 0; i < cycle->listening.nelts; i++) {
311
312 c = ls[i].connection;
313
314 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
315
316 if (ngx_add_conn(c) == NGX_ERROR) {
317 return NGX_ERROR;
318 }
319
320 } else {
321 if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
322 return NGX_ERROR;
323 }
324 }
325 }
326
327 return NGX_OK;
328 }
329
330
331 static ngx_int_t
332 ngx_disable_accept_events(ngx_cycle_t *cycle)
333 {
334 ngx_uint_t i;
335 ngx_listening_t *ls;
336 ngx_connection_t *c;
337
338 ls = cycle->listening.elts;
339 for (i = 0; i < cycle->listening.nelts; i++) {
340
341 c = ls[i].connection;
342
343 if (!c->read->active) {
344 continue;
345 }
346
347 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
348 if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) {
349 return NGX_ERROR;
350 }
351
352 } else {
353 if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT)
354 == NGX_ERROR)
355 {
356 return NGX_ERROR;
357 }
358 }
359 }
360
361 return NGX_OK;
362 }
363
364
365 static void
366 ngx_close_accepted_connection(ngx_connection_t *c)
367 {
368 ngx_socket_t fd;
369
370 ngx_free_connection(c);
371
372 fd = c->fd;
373 c->fd = (ngx_socket_t) -1;
374
375 if (ngx_close_socket(fd) == -1) {
376 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
377 ngx_close_socket_n " failed");
378 }
379
380 if (c->pool) {
381 ngx_destroy_pool(c->pool);
382 }
383
384 #if (NGX_STAT_STUB)
385 ngx_atomic_fetch_add(ngx_stat_active, -1);
386 #endif
387 }
388
389
390 u_char *
391 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
392 {
393 return ngx_snprintf(buf, len, " while accepting new connection on %V",
394 log->data);
395 }
396
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