3 * Copyright (C) Igor Sysoev
7 #include <ngx_config.h>
12 /* the buffer size is enough to hold "struct sockaddr_un" */
13 #define NGX_SOCKLEN 512
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);
22 ngx_event_accept(ngx_event_t *ev)
28 ngx_event_t *rev, *wev;
30 ngx_connection_t *c, *lc;
31 ngx_event_conf_t *ecf;
34 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
36 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
39 } else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
40 ev->available = ecf->multi_accept;
47 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
48 "accept on %V, ready: %d", &ls->addr_text, ev->available);
51 socklen = NGX_SOCKLEN;
53 s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
56 err = ngx_socket_errno;
58 if (err == NGX_EAGAIN) {
59 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err,
60 "accept() not ready");
64 ngx_log_error((err == NGX_ECONNABORTED) ? NGX_LOG_ERR:
66 ev->log, err, "accept() failed");
68 if (err == NGX_ECONNABORTED) {
69 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
82 ngx_atomic_fetch_add(ngx_stat_accepted, 1);
85 ngx_accept_disabled = ngx_cycle->connection_n / 8
86 - ngx_cycle->free_connection_n;
88 c = ngx_get_connection(s, ev->log);
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");
100 ngx_atomic_fetch_add(ngx_stat_active, 1);
103 c->pool = ngx_create_pool(ls->pool_size, ev->log);
104 if (c->pool == NULL) {
105 ngx_close_accepted_connection(c);
109 c->sockaddr = ngx_palloc(c->pool, socklen);
110 if (c->sockaddr == NULL) {
111 ngx_close_accepted_connection(c);
115 ngx_memcpy(c->sockaddr, sa, socklen);
117 log = ngx_palloc(c->pool, sizeof(ngx_log_t));
119 ngx_close_accepted_connection(c);
123 /* set a blocking mode for aio and non-blocking mode for others */
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);
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);
150 c->recv_chain = ngx_recv_chain;
151 c->send_chain = ngx_send_chain;
157 c->socklen = socklen;
159 c->unexpected_eof = 1;
166 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
167 /* rtsig, aio, iocp */
171 if (ev->deferred_accept) {
173 #if (NGX_HAVE_KQUEUE)
182 * TODO: MT: - ngx_atomic_fetch_add()
183 * or protection by critical section or light mutex
185 * TODO: MP: - allocated in a shared memory
186 * - ngx_atomic_fetch_add()
187 * or protection by critical section or light mutex
190 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
193 ngx_atomic_fetch_add(ngx_stat_handled, 1);
197 rev->lock = &c->lock;
198 wev->lock = &c->lock;
199 rev->own_lock = &c->lock;
200 wev->own_lock = &c->lock;
204 c->addr_text.data = ngx_pnalloc(c->pool, ls->addr_text_max_len);
205 if (c->addr_text.data == NULL) {
206 ngx_close_accepted_connection(c);
210 c->addr_text.len = ngx_sock_ntop(c->sockaddr, c->addr_text.data,
211 ls->addr_text_max_len);
212 if (c->addr_text.len == 0) {
213 ngx_close_accepted_connection(c);
222 ngx_event_debug_t *dc;
223 struct sockaddr_in *sin;
225 sin = (struct sockaddr_in *) sa;
226 dc = ecf->debug_connection.elts;
227 for (i = 0; i < ecf->debug_connection.nelts; i++) {
228 if ((sin->sin_addr.s_addr & dc[i].mask) == dc[i].addr) {
229 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
237 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
238 "*%d accept: %V fd:%d", c->number, &c->addr_text, s);
240 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
241 if (ngx_add_conn(c) == NGX_ERROR) {
242 ngx_close_accepted_connection(c);
252 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
256 } while (ev->available);
261 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
263 if (ngx_shmtx_trylock(&ngx_accept_mutex)) {
265 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
266 "accept mutex locked");
268 if (ngx_accept_mutex_held
269 && ngx_accept_events == 0
270 && !(ngx_event_flags & NGX_USE_RTSIG_EVENT))
275 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
276 ngx_shmtx_unlock(&ngx_accept_mutex);
280 ngx_accept_events = 0;
281 ngx_accept_mutex_held = 1;
286 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
287 "accept mutex lock failed: %ui", ngx_accept_mutex_held);
289 if (ngx_accept_mutex_held) {
290 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
294 ngx_accept_mutex_held = 0;
302 ngx_enable_accept_events(ngx_cycle_t *cycle)
308 ls = cycle->listening.elts;
309 for (i = 0; i < cycle->listening.nelts; i++) {
311 c = ls[i].connection;
313 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
315 if (ngx_add_conn(c) == NGX_ERROR) {
320 if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
331 ngx_disable_accept_events(ngx_cycle_t *cycle)
337 ls = cycle->listening.elts;
338 for (i = 0; i < cycle->listening.nelts; i++) {
340 c = ls[i].connection;
342 if (!c->read->active) {
346 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
347 if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) {
352 if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT)
365 ngx_close_accepted_connection(ngx_connection_t *c)
369 ngx_free_connection(c);
372 c->fd = (ngx_socket_t) -1;
374 if (ngx_close_socket(fd) == -1) {
375 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
376 ngx_close_socket_n " failed");
380 ngx_destroy_pool(c->pool);
384 ngx_atomic_fetch_add(ngx_stat_active, -1);
390 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
392 return ngx_snprintf(buf, len, " while accepting new connection on %V",