| /* | |
| * Copyright (C) Igor Sysoev | |
| */ | |
| #include <ngx_config.h> | |
| #include <ngx_core.h> | |
| #include <ngx_event.h> | |
| /* the buffer size is enough to hold "struct sockaddr_un" */ | |
| #define NGX_SOCKLEN 512 | |
| static ngx_int_t ngx_enable_accept_events(ngx_cycle_t *cycle); | |
| static ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle); | |
| static void ngx_close_accepted_connection(ngx_connection_t *c); | |
| void | |
| ngx_event_accept(ngx_event_t *ev) | |
| { | |
| socklen_t socklen; | |
| ngx_err_t err; | |
| ngx_log_t *log; | |
| ngx_socket_t s; | |
| ngx_event_t *rev, *wev; | |
| ngx_listening_t *ls; | |
| ngx_connection_t *c, *lc; | |
| ngx_event_conf_t *ecf; | |
| char sa[NGX_SOCKLEN]; | |
| ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module); | |
| if (ngx_event_flags & NGX_USE_RTSIG_EVENT) { | |
| ev->available = 1; | |
| } else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) { | |
| ev->available = ecf->multi_accept; | |
| } | |
| lc = ev->data; | |
| ls = lc->listening; | |
| ev->ready = 0; | |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, | |
| "accept on %V, ready: %d", &ls->addr_text, ev->available); | |
| do { | |
| socklen = NGX_SOCKLEN; | |
| s = accept(lc->fd, (struct sockaddr *) sa, &socklen); | |
| if (s == -1) { | |
| err = ngx_socket_errno; | |
| if (err == NGX_EAGAIN) { | |
| ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err, | |
| "accept() not ready"); | |
| return; | |
| } | |
| ngx_log_error((err == NGX_ECONNABORTED) ? NGX_LOG_ERR: | |
| NGX_LOG_ALERT, | |
| ev->log, err, "accept() failed"); | |
| if (err == NGX_ECONNABORTED) { | |
| if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { | |
| ev->available--; | |
| } | |
| if (ev->available) { | |
| continue; | |
| } | |
| } | |
| return; | |
| } | |
| #if (NGX_STAT_STUB) | |
| ngx_atomic_fetch_add(ngx_stat_accepted, 1); | |
| #endif | |
| ngx_accept_disabled = ngx_cycle->connection_n / 8 | |
| - ngx_cycle->free_connection_n; | |
| c = ngx_get_connection(s, ev->log); | |
| if (c == NULL) { | |
| if (ngx_close_socket(s) == -1) { | |
| ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno, | |
| ngx_close_socket_n " failed"); | |
| } | |
| return; | |
| } | |
| #if (NGX_STAT_STUB) | |
| ngx_atomic_fetch_add(ngx_stat_active, 1); | |
| #endif | |
| c->pool = ngx_create_pool(ls->pool_size, ev->log); | |
| if (c->pool == NULL) { | |
| ngx_close_accepted_connection(c); | |
| return; | |
| } | |
| c->sockaddr = ngx_palloc(c->pool, socklen); | |
| if (c->sockaddr == NULL) { | |
| ngx_close_accepted_connection(c); | |
| return; | |
| } | |
| ngx_memcpy(c->sockaddr, sa, socklen); | |
| log = ngx_palloc(c->pool, sizeof(ngx_log_t)); | |
| if (log == NULL) { | |
| ngx_close_accepted_connection(c); | |
| return; | |
| } | |
| /* set a blocking mode for aio and non-blocking mode for others */ | |
| if (ngx_inherited_nonblocking) { | |
| if (ngx_event_flags & NGX_USE_AIO_EVENT) { | |
| if (ngx_blocking(s) == -1) { | |
| ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno, | |
| ngx_blocking_n " failed"); | |
| ngx_close_accepted_connection(c); | |
| return; | |
| } | |
| } | |
| } else { | |
| if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) { | |
| if (ngx_nonblocking(s) == -1) { | |
| ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno, | |
| ngx_nonblocking_n " failed"); | |
| ngx_close_accepted_connection(c); | |
| return; | |
| } | |
| } | |
| } | |
| *log = ls->log; | |
| c->recv = ngx_recv; | |
| c->send = ngx_send; | |
| c->recv_chain = ngx_recv_chain; | |
| c->send_chain = ngx_send_chain; | |
| c->log = log; | |
| c->pool->log = log; | |
| c->listening = ls; | |
| c->socklen = socklen; | |
| c->unexpected_eof = 1; | |
| rev = c->read; | |
| wev = c->write; | |
| wev->ready = 1; | |
| if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) { | |
| /* rtsig, aio, iocp */ | |
| rev->ready = 1; | |
| } | |
| if (ev->deferred_accept) { | |
| rev->ready = 1; | |
| #if (NGX_HAVE_KQUEUE) | |
| rev->available = 1; | |
| #endif | |
| } | |
| rev->log = log; | |
| wev->log = log; | |
| /* | |
| * TODO: MT: - ngx_atomic_fetch_add() | |
| * or protection by critical section or light mutex | |
| * | |
| * TODO: MP: - allocated in a shared memory | |
| * - ngx_atomic_fetch_add() | |
| * or protection by critical section or light mutex | |
| */ | |
| c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
| #if (NGX_STAT_STUB) | |
| ngx_atomic_fetch_add(ngx_stat_handled, 1); | |
| #endif | |
| #if (NGX_THREADS) | |
| rev->lock = &c->lock; | |
| wev->lock = &c->lock; | |
| rev->own_lock = &c->lock; | |
| wev->own_lock = &c->lock; | |
| #endif | |
| if (ls->addr_ntop) { | |
| c->addr_text.data = ngx_pnalloc(c->pool, ls->addr_text_max_len); | |
| if (c->addr_text.data == NULL) { | |
| ngx_close_accepted_connection(c); | |
| return; | |
| } | |
| c->addr_text.len = ngx_sock_ntop(c->sockaddr, c->addr_text.data, | |
| ls->addr_text_max_len); | |
| if (c->addr_text.len == 0) { | |
| ngx_close_accepted_connection(c); | |
| return; | |
| } | |
| } | |
| #if (NGX_DEBUG) | |
| { | |
| in_addr_t i; | |
| ngx_event_debug_t *dc; | |
| struct sockaddr_in *sin; | |
| sin = (struct sockaddr_in *) sa; | |
| dc = ecf->debug_connection.elts; | |
| for (i = 0; i < ecf->debug_connection.nelts; i++) { | |
| if ((sin->sin_addr.s_addr & dc[i].mask) == dc[i].addr) { | |
| log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL; | |
| break; | |
| } | |
| } | |
| } | |
| #endif | |
| ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0, | |
| "*%d accept: %V fd:%d", c->number, &c->addr_text, s); | |
| if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) { | |
| if (ngx_add_conn(c) == NGX_ERROR) { | |
| ngx_close_accepted_connection(c); | |
| return; | |
| } | |
| } | |
| log->data = NULL; | |
| log->handler = NULL; | |
| ls->handler(c); | |
| if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { | |
| ev->available--; | |
| } | |
| } while (ev->available); | |
| } | |
| ngx_int_t | |
| ngx_trylock_accept_mutex(ngx_cycle_t *cycle) | |
| { | |
| if (ngx_shmtx_trylock(&ngx_accept_mutex)) { | |
| ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, | |
| "accept mutex locked"); | |
| if (ngx_accept_mutex_held | |
| && ngx_accept_events == 0 | |
| && !(ngx_event_flags & NGX_USE_RTSIG_EVENT)) | |
| { | |
| return NGX_OK; | |
| } | |
| if (ngx_enable_accept_events(cycle) == NGX_ERROR) { | |
| ngx_shmtx_unlock(&ngx_accept_mutex); | |
| return NGX_ERROR; | |
| } | |
| ngx_accept_events = 0; | |
| ngx_accept_mutex_held = 1; | |
| return NGX_OK; | |
| } | |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, | |
| "accept mutex lock failed: %ui", ngx_accept_mutex_held); | |
| if (ngx_accept_mutex_held) { | |
| if (ngx_disable_accept_events(cycle) == NGX_ERROR) { | |
| return NGX_ERROR; | |
| } | |
| ngx_accept_mutex_held = 0; | |
| } | |
| return NGX_OK; | |
| } | |
| static ngx_int_t | |
| ngx_enable_accept_events(ngx_cycle_t *cycle) | |
| { | |
| ngx_uint_t i; | |
| ngx_listening_t *ls; | |
| ngx_connection_t *c; | |
| ls = cycle->listening.elts; | |
| for (i = 0; i < cycle->listening.nelts; i++) { | |
| c = ls[i].connection; | |
| if (ngx_event_flags & NGX_USE_RTSIG_EVENT) { | |
| if (ngx_add_conn(c) == NGX_ERROR) { | |
| return NGX_ERROR; | |
| } | |
| } else { | |
| if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) { | |
| return NGX_ERROR; | |
| } | |
| } | |
| } | |
| return NGX_OK; | |
| } | |
| static ngx_int_t | |
| ngx_disable_accept_events(ngx_cycle_t *cycle) | |
| { | |
| ngx_uint_t i; | |
| ngx_listening_t *ls; | |
| ngx_connection_t *c; | |
| ls = cycle->listening.elts; | |
| for (i = 0; i < cycle->listening.nelts; i++) { | |
| c = ls[i].connection; | |
| if (!c->read->active) { | |
| continue; | |
| } | |
| if (ngx_event_flags & NGX_USE_RTSIG_EVENT) { | |
| if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) { | |
| return NGX_ERROR; | |
| } | |
| } else { | |
| if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT) | |
| == NGX_ERROR) | |
| { | |
| return NGX_ERROR; | |
| } | |
| } | |
| } | |
| return NGX_OK; | |
| } | |
| static void | |
| ngx_close_accepted_connection(ngx_connection_t *c) | |
| { | |
| ngx_socket_t fd; | |
| ngx_free_connection(c); | |
| fd = c->fd; | |
| c->fd = (ngx_socket_t) -1; | |
| if (ngx_close_socket(fd) == -1) { | |
| ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno, | |
| ngx_close_socket_n " failed"); | |
| } | |
| if (c->pool) { | |
| ngx_destroy_pool(c->pool); | |
| } | |
| #if (NGX_STAT_STUB) | |
| ngx_atomic_fetch_add(ngx_stat_active, -1); | |
| #endif | |
| } | |
| u_char * | |
| ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len) | |
| { | |
| return ngx_snprintf(buf, len, " while accepting new connection on %V", | |
| log->data); | |
| } |