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comparison src/event/ngx_event_accept.c @ 0:f0b350454894 NGINX_0_1_0

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nginx 0.1.0 *) The first public version.
author Igor Sysoev <http://sysoev.ru>
date Mon, 04 Oct 2004 00:00:00 +0400
parents
children 4b2dafa26fe2
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-1:000000000000 0:f0b350454894
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 #include <nginx.h>
11
12
13 typedef struct {
14 int flag;
15 u_char *name;
16 } ngx_accept_log_ctx_t;
17
18
19 static void ngx_close_accepted_socket(ngx_socket_t s, ngx_log_t *log);
20 static size_t ngx_accept_log_error(void *data, char *buf, size_t len);
21
22
23 void ngx_event_accept(ngx_event_t *ev)
24 {
25 ngx_uint_t instance, accepted;
26 socklen_t len;
27 struct sockaddr *sa;
28 ngx_err_t err;
29 ngx_log_t *log;
30 ngx_pool_t *pool;
31 ngx_socket_t s;
32 ngx_event_t *rev, *wev;
33 ngx_connection_t *c, *ls;
34 ngx_event_conf_t *ecf;
35 ngx_accept_log_ctx_t *ctx;
36
37 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
38
39 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
40 ev->available = 1;
41
42 } else if (!(ngx_event_flags & NGX_HAVE_KQUEUE_EVENT)) {
43 ev->available = ecf->multi_accept;
44 }
45
46 ls = ev->data;
47
48 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
49 "accept on %s, ready: %d",
50 ls->listening->addr_text.data, ev->available);
51
52 ev->ready = 0;
53 accepted = 0;
54 pool = NULL;
55
56 do {
57
58 if (pool == NULL) {
59
60 /*
61 * Create the pool before accept() to avoid the copying of
62 * the sockaddr. Although accept() can fail it is uncommon
63 * case and besides the pool can be got from the free pool list
64 */
65
66 if (!(pool = ngx_create_pool(ls->listening->pool_size, ev->log))) {
67 return;
68 }
69 }
70
71 if (!(sa = ngx_palloc(pool, ls->listening->socklen))) {
72 ngx_destroy_pool(pool);
73 return;
74 }
75
76 if (!(log = ngx_palloc(pool, sizeof(ngx_log_t)))) {
77 ngx_destroy_pool(pool);
78 return;
79 }
80
81 ngx_memcpy(log, ls->log, sizeof(ngx_log_t));
82 pool->log = log;
83
84 if (!(ctx = ngx_palloc(pool, sizeof(ngx_accept_log_ctx_t)))) {
85 ngx_destroy_pool(pool);
86 return;
87 }
88
89 /* -1 disables the connection number logging */
90 ctx->flag = -1;
91 ctx->name = ls->listening->addr_text.data;
92
93 log->data = ctx;
94 log->handler = ngx_accept_log_error;
95
96 len = ls->listening->socklen;
97
98 s = accept(ls->fd, sa, &len);
99 if (s == -1) {
100 err = ngx_socket_errno;
101
102 if (err == NGX_EAGAIN) {
103 #if 0
104 if (!(ngx_event_flags & NGX_USE_RTSIG_EVENT))
105 {
106 ngx_log_error(NGX_LOG_NOTICE, log, err,
107 "EAGAIN after %d accepted connection(s)",
108 accepted);
109 }
110 #endif
111
112 ngx_destroy_pool(pool);
113 return;
114 }
115
116 ngx_log_error(NGX_LOG_ALERT, ev->log, err,
117 "accept() on %s failed",
118 ls->listening->addr_text.data);
119
120 if (err == NGX_ECONNABORTED) {
121 if (ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) {
122 ev->available--;
123 }
124
125 if (ev->available) {
126 /* reuse the previously allocated pool */
127 continue;
128 }
129 }
130
131 ngx_destroy_pool(pool);
132 return;
133 }
134
135 #if (NGX_STAT_STUB)
136 (*ngx_stat_accepted)++;
137 #endif
138
139 ngx_accept_disabled = (ngx_uint_t) s + NGX_ACCEPT_THRESHOLD
140 - ecf->connections;
141
142 /* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
143
144 if ((ngx_uint_t) s >= ecf->connections) {
145
146 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
147 "accept() on %s returned socket #%d while "
148 "only %d connections was configured, "
149 "closing the connection",
150 ls->listening->addr_text.data, s, ecf->connections);
151
152 ngx_close_accepted_socket(s, log);
153 ngx_destroy_pool(pool);
154 return;
155 }
156
157 #if (NGX_STAT_STUB)
158 (*ngx_stat_active)++;
159 #endif
160
161 /* set a blocking mode for aio and non-blocking mode for the others */
162
163 if (ngx_inherited_nonblocking) {
164 if ((ngx_event_flags & NGX_USE_AIO_EVENT)) {
165 if (ngx_blocking(s) == -1) {
166 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
167 ngx_blocking_n " failed");
168
169 ngx_close_accepted_socket(s, log);
170 ngx_destroy_pool(pool);
171 return;
172 }
173 }
174
175 } else {
176 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
177 if (ngx_nonblocking(s) == -1) {
178 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
179 ngx_nonblocking_n " failed");
180
181 ngx_close_accepted_socket(s, log);
182 ngx_destroy_pool(pool);
183 return;
184 }
185 }
186 }
187
188 #if (WIN32)
189 /*
190 * Winsock assignes a socket number divisible by 4
191 * so to find a connection we divide a socket number by 4.
192 */
193
194 if (s % 4) {
195 ngx_log_error(NGX_LOG_EMERG, ev->log, 0,
196 "accept() on %s returned socket #%d, "
197 "not divisible by 4",
198 ls->listening->addr_text.data, s);
199 exit(1);
200 }
201
202 c = &ngx_cycle->connections[s / 4];
203 rev = &ngx_cycle->read_events[s / 4];
204 wev = &ngx_cycle->write_events[s / 4];
205 #else
206 c = &ngx_cycle->connections[s];
207 rev = &ngx_cycle->read_events[s];
208 wev = &ngx_cycle->write_events[s];
209 #endif
210
211 instance = rev->instance;
212
213 #if (NGX_THREADS)
214
215 if (*(&c->lock)) {
216 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
217 "spinlock in accept, fd:%", s);
218 ngx_spinlock(&c->lock, 1000);
219 ngx_unlock(&c->lock);
220 }
221
222 #endif
223
224 ngx_memzero(rev, sizeof(ngx_event_t));
225 ngx_memzero(wev, sizeof(ngx_event_t));
226 ngx_memzero(c, sizeof(ngx_connection_t));
227
228 c->pool = pool;
229
230 c->listening = ls->listening;
231 c->sockaddr = sa;
232 c->socklen = len;
233
234 rev->instance = !instance;
235 wev->instance = !instance;
236
237 rev->index = NGX_INVALID_INDEX;
238 wev->index = NGX_INVALID_INDEX;
239
240 rev->data = c;
241 wev->data = c;
242
243 c->read = rev;
244 c->write = wev;
245
246 c->fd = s;
247 c->unexpected_eof = 1;
248
249 wev->write = 1;
250 wev->ready = 1;
251
252 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
253 /* epoll, rtsig, aio, iocp */
254 rev->ready = 1;
255 }
256
257 if (ev->deferred_accept) {
258 rev->ready = 1;
259 }
260
261 c->ctx = ls->ctx;
262 c->servers = ls->servers;
263
264 c->recv = ngx_recv;
265 c->send_chain = ngx_send_chain;
266
267 c->log = log;
268 rev->log = log;
269 wev->log = log;
270
271 /*
272 * TODO: MT: - atomic increment (x86: lock xadd)
273 * or protection by critical section or light mutex
274 *
275 * TODO: MP: - allocated in a shared memory
276 * - atomic increment (x86: lock xadd)
277 * or protection by critical section or light mutex
278 */
279
280 c->number = ngx_atomic_inc(ngx_connection_counter);
281
282 #if (NGX_THREADS)
283 rev->lock = &c->lock;
284 wev->lock = &c->lock;
285 rev->own_lock = &c->lock;
286 wev->own_lock = &c->lock;
287 #endif
288
289 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
290 "accept: fd:%d c:%d", s, c->number);
291
292 if (c->listening->addr_ntop) {
293 c->addr_text.data = ngx_palloc(c->pool,
294 c->listening->addr_text_max_len);
295 if (c->addr_text.data == NULL) {
296 ngx_close_accepted_socket(s, log);
297 ngx_destroy_pool(pool);
298 return;
299 }
300
301 c->addr_text.len = ngx_sock_ntop(c->listening->family, c->sockaddr,
302 c->addr_text.data,
303 c->listening->addr_text_max_len);
304 if (c->addr_text.len == 0) {
305 ngx_close_accepted_socket(s, log);
306 ngx_destroy_pool(pool);
307 return;
308 }
309 }
310
311 #if (NGX_DEBUG)
312 {
313
314 uint32_t *addr;
315 in_addr_t i;
316 struct sockaddr_in *addr_in;
317
318 addr_in = (struct sockaddr_in *) sa;
319 addr = ecf->debug_connection.elts;
320 for (i = 0; i < ecf->debug_connection.nelts; i++) {
321 if (addr[i] == addr_in->sin_addr.s_addr) {
322 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
323 break;
324 }
325 }
326
327 }
328 #endif
329
330 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
331 if (ngx_add_conn(c) == NGX_ERROR) {
332 ngx_close_accepted_socket(s, log);
333 ngx_destroy_pool(pool);
334 return;
335 }
336 }
337
338 pool = NULL;
339
340 log->data = NULL;
341 log->handler = NULL;
342
343 ls->listening->handler(c);
344
345 if (ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) {
346 ev->available--;
347 }
348
349 accepted++;
350
351 } while (ev->available);
352 }
353
354
355 ngx_int_t ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
356 {
357 if (*ngx_accept_mutex == 0
358 && ngx_atomic_cmp_set(ngx_accept_mutex, 0, ngx_pid))
359 {
360 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
361 "accept mutex locked");
362
363 if (!ngx_accept_mutex_held) {
364 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
365 *ngx_accept_mutex = 0;
366 return NGX_ERROR;
367 }
368
369 ngx_accept_mutex_held = 1;
370 }
371
372 return NGX_OK;
373 }
374
375 if (ngx_accept_mutex_held) {
376 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
377 return NGX_ERROR;
378 }
379
380 ngx_accept_mutex_held = 0;
381 }
382
383 return NGX_OK;
384 }
385
386
387 ngx_int_t ngx_enable_accept_events(ngx_cycle_t *cycle)
388 {
389 ngx_uint_t i;
390 ngx_listening_t *s;
391
392 s = cycle->listening.elts;
393 for (i = 0; i < cycle->listening.nelts; i++) {
394
395 /*
396 * we do not need to handle the Winsock sockets here (divide a socket
397 * number by 4) because this function would never called
398 * in the Winsock environment
399 */
400
401 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
402 if (ngx_add_conn(&cycle->connections[s[i].fd]) == NGX_ERROR) {
403 return NGX_ERROR;
404 }
405
406 } else {
407 if (ngx_add_event(&cycle->read_events[s[i].fd], NGX_READ_EVENT, 0)
408 == NGX_ERROR)
409 {
410 return NGX_ERROR;
411 }
412 }
413 }
414
415 return NGX_OK;
416 }
417
418
419 ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle)
420 {
421 ngx_uint_t i;
422 ngx_listening_t *s;
423
424 s = cycle->listening.elts;
425 for (i = 0; i < cycle->listening.nelts; i++) {
426
427 /*
428 * we do not need to handle the Winsock sockets here (divide a socket
429 * number by 4) because this function would never called
430 * in the Winsock environment
431 */
432
433 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
434 if (!cycle->connections[s[i].fd].read->active) {
435 continue;
436 }
437
438 if (ngx_del_conn(&cycle->connections[s[i].fd], NGX_DISABLE_EVENT)
439 == NGX_ERROR)
440 {
441 return NGX_ERROR;
442 }
443
444 } else {
445 if (!cycle->read_events[s[i].fd].active) {
446 continue;
447 }
448
449 if (ngx_del_event(&cycle->read_events[s[i].fd], NGX_READ_EVENT,
450 NGX_DISABLE_EVENT) == NGX_ERROR)
451 {
452 return NGX_ERROR;
453 }
454 }
455 }
456
457 return NGX_OK;
458 }
459
460
461 static void ngx_close_accepted_socket(ngx_socket_t s, ngx_log_t *log)
462 {
463 if (ngx_close_socket(s) == -1) {
464 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
465 ngx_close_socket_n " failed");
466 }
467 }
468
469
470 static size_t ngx_accept_log_error(void *data, char *buf, size_t len)
471 {
472 ngx_accept_log_ctx_t *ctx = data;
473
474 return ngx_snprintf(buf, len, " while accept() on %s", ctx->name);
475 }