| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| #include <ngx_event.h> |
| #include <nginx.h> |
| |
| |
| typedef struct { |
| int flag; |
| u_char *name; |
| } ngx_accept_log_ctx_t; |
| |
| |
| static size_t ngx_accept_log_error(void *data, char *buf, size_t len); |
| |
| |
| void ngx_event_accept(ngx_event_t *ev) |
| { |
| ngx_uint_t instance, rinstance, winstance, accepted; |
| socklen_t len; |
| struct sockaddr *sa; |
| ngx_err_t err; |
| ngx_log_t *log; |
| ngx_pool_t *pool; |
| ngx_socket_t s; |
| ngx_event_t *rev, *wev; |
| ngx_connection_t *c, *ls; |
| ngx_event_conf_t *ecf; |
| ngx_accept_log_ctx_t *ctx; |
| |
| ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module); |
| |
| if (ngx_event_flags & (NGX_USE_EDGE_EVENT|NGX_USE_SIGIO_EVENT)) { |
| ev->available = 1; |
| |
| } else if (!(ngx_event_flags & NGX_HAVE_KQUEUE_EVENT)) { |
| ev->available = ecf->multi_accept; |
| } |
| |
| ls = ev->data; |
| |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, |
| "accept on %s, ready: %d", |
| ls->listening->addr_text.data, ev->available); |
| |
| ev->ready = 0; |
| accepted = 0; |
| pool = NULL; |
| |
| do { |
| |
| if (pool == NULL) { |
| |
| /* |
| * Create the pool before accept() to avoid copy the sockaddr. |
| * Although accept() can fail it's an uncommon case |
| * and besides the pool can be got from the free pool list |
| */ |
| |
| if (!(pool = ngx_create_pool(ls->listening->pool_size, ev->log))) { |
| return; |
| } |
| } |
| |
| if (!(sa = ngx_palloc(pool, ls->listening->socklen))) { |
| ngx_destroy_pool(pool); |
| return; |
| } |
| |
| if (!(log = ngx_palloc(pool, sizeof(ngx_log_t)))) { |
| ngx_destroy_pool(pool); |
| return; |
| } |
| |
| ngx_memcpy(log, ls->log, sizeof(ngx_log_t)); |
| pool->log = log; |
| |
| if (!(ctx = ngx_palloc(pool, sizeof(ngx_accept_log_ctx_t)))) { |
| ngx_destroy_pool(pool); |
| return; |
| } |
| |
| /* -1 disable logging the connection number */ |
| ctx->flag = -1; |
| ctx->name = ls->listening->addr_text.data; |
| |
| log->data = ctx; |
| log->handler = ngx_accept_log_error; |
| |
| len = ls->listening->socklen; |
| |
| s = accept(ls->fd, sa, &len); |
| if (s == -1) { |
| err = ngx_socket_errno; |
| |
| if (err == NGX_EAGAIN) { |
| if (!(ngx_event_flags |
| & (NGX_USE_EDGE_EVENT|NGX_USE_SIGIO_EVENT))) |
| { |
| ngx_log_error(NGX_LOG_NOTICE, log, err, |
| "EAGAIN after %d accepted connection(s)", |
| accepted); |
| } |
| |
| ngx_destroy_pool(pool); |
| return; |
| } |
| |
| ngx_log_error(NGX_LOG_ALERT, ev->log, err, |
| "accept() on %s failed", |
| ls->listening->addr_text.data); |
| |
| if (err == NGX_ECONNABORTED) { |
| if (ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) { |
| ev->available--; |
| } |
| |
| if (ev->available) { |
| /* reuse the previously allocated pool */ |
| continue; |
| } |
| } |
| |
| ngx_destroy_pool(pool); |
| return; |
| } |
| |
| /* disable warning: Win32 SOCKET is u_int while UNIX socket is int */ |
| |
| if ((unsigned) s >= (unsigned) ecf->connections) { |
| |
| ngx_log_error(NGX_LOG_ALERT, ev->log, 0, |
| "accept() on %s returned socket #%d while " |
| "only %d connections was configured, " |
| "closing the connection", |
| ls->listening->addr_text.data, s, ecf->connections); |
| |
| if (ngx_close_socket(s) == -1) { |
| ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno, |
| ngx_close_socket_n "failed"); |
| } |
| |
| /* TODO: disable temporary accept() event */ |
| |
| ngx_destroy_pool(pool); |
| return; |
| } |
| |
| /* set a blocking mode for aio and non-blocking mode for the others */ |
| |
| if (ngx_inherited_nonblocking) { |
| if ((ngx_event_flags & NGX_USE_AIO_EVENT)) { |
| if (ngx_blocking(s) == -1) { |
| ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno, |
| ngx_blocking_n " failed"); |
| |
| if (ngx_close_socket(s) == -1) { |
| ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno, |
| ngx_close_socket_n " failed"); |
| } |
| |
| ngx_destroy_pool(pool); |
| return; |
| } |
| } |
| |
| } else { |
| if (!(ngx_event_flags & NGX_USE_AIO_EVENT)) { |
| if (ngx_nonblocking(s) == -1) { |
| ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno, |
| ngx_nonblocking_n " failed"); |
| |
| if (ngx_close_socket(s) == -1) { |
| ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno, |
| ngx_close_socket_n " failed"); |
| } |
| |
| ngx_destroy_pool(pool); |
| return; |
| } |
| } |
| } |
| |
| #if (WIN32) |
| /* |
| * Winsock assignes a socket number divisible by 4 |
| * so to find a connection we divide a socket number by 4. |
| */ |
| |
| if (s % 4) { |
| ngx_log_error(NGX_LOG_EMERG, ev->log, 0, |
| "accept() on %s returned socket #%d, " |
| "not divisible by 4", |
| ls->listening->addr_text.data, s); |
| exit(1); |
| } |
| |
| c = &ngx_cycle->connections[s / 4]; |
| rev = &ngx_cycle->read_events[s / 4]; |
| wev = &ngx_cycle->write_events[s / 4]; |
| #else |
| c = &ngx_cycle->connections[s]; |
| rev = &ngx_cycle->read_events[s]; |
| wev = &ngx_cycle->write_events[s]; |
| #endif |
| |
| instance = rev->instance; |
| rinstance = rev->returned_instance; |
| winstance = wev->returned_instance; |
| |
| ngx_memzero(rev, sizeof(ngx_event_t)); |
| ngx_memzero(wev, sizeof(ngx_event_t)); |
| ngx_memzero(c, sizeof(ngx_connection_t)); |
| |
| c->pool = pool; |
| |
| c->listening = ls->listening; |
| c->sockaddr = sa; |
| c->socklen = len; |
| |
| if (ngx_event_flags & NGX_HAVE_INSTANCE_EVENT) { |
| rev->use_instance = 1; |
| rev->instance = (u_char) !instance; |
| rev->returned_instance = (u_char) rinstance; |
| |
| wev->use_instance = 1; |
| wev->instance = (u_char) !instance; |
| wev->returned_instance = (u_char) winstance; |
| } |
| |
| rev->index = NGX_INVALID_INDEX; |
| wev->index = NGX_INVALID_INDEX; |
| |
| rev->data = c; |
| wev->data = c; |
| |
| c->read = rev; |
| c->write = wev; |
| |
| c->fd = s; |
| c->unexpected_eof = 1; |
| |
| wev->write = 1; |
| wev->ready = 1; |
| |
| if (ngx_event_flags |
| & (NGX_USE_AIO_EVENT|NGX_USE_EDGE_EVENT|NGX_USE_SIGIO_EVENT)) |
| { |
| /* aio, iocp, sigio, epoll */ |
| rev->ready = 1; |
| } |
| |
| if (ev->deferred_accept) { |
| rev->ready = 1; |
| } |
| |
| c->ctx = ls->ctx; |
| c->servers = ls->servers; |
| |
| c->log = log; |
| rev->log = log; |
| wev->log = log; |
| |
| /* |
| * TODO: MT: - atomic increment (x86: lock xadd) |
| * or protection by critical section or light mutex |
| * |
| * TODO: MP: - allocated in a shared memory |
| * - atomic increment (x86: lock xadd) |
| * or protection by critical section or light mutex |
| */ |
| |
| c->number = ngx_atomic_inc(ngx_connection_counter); |
| |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, |
| "accept: fd:%d c:%d", s, c->number); |
| |
| #if (NGX_DEBUG) |
| { |
| |
| uint32_t *addr; |
| in_addr_t i; |
| struct sockaddr_in *addr_in; |
| |
| addr_in = (struct sockaddr_in *) sa; |
| addr = ecf->debug_connection.elts; |
| for (i = 0; i < ecf->debug_connection.nelts; i++) { |
| if (addr[i] == addr_in->sin_addr.s_addr) { |
| log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL; |
| break; |
| } |
| } |
| |
| } |
| #endif |
| |
| if (ngx_add_conn) { |
| if (ngx_add_conn(c) == NGX_ERROR) { |
| if (ngx_close_socket(s) == -1) { |
| ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno, |
| ngx_close_socket_n " failed"); |
| } |
| |
| ngx_destroy_pool(pool); |
| return; |
| } |
| } |
| |
| pool = NULL; |
| |
| log->data = NULL; |
| log->handler = NULL; |
| |
| ls->listening->handler(c); |
| |
| if (ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) { |
| ev->available--; |
| } |
| |
| accepted++; |
| |
| } while (ev->available); |
| } |
| |
| |
| ngx_int_t ngx_trylock_accept_mutex(ngx_cycle_t *cycle) |
| { |
| if (*ngx_accept_mutex == 0 |
| && ngx_atomic_cmp_set(ngx_accept_mutex, 0, ngx_pid)) |
| { |
| |
| ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "accept mutex locked"); |
| |
| if (!ngx_accept_mutex_held) { |
| if (ngx_enable_accept_events(cycle) == NGX_ERROR) { |
| *ngx_accept_mutex = 0; |
| return NGX_ERROR; |
| } |
| |
| ngx_accept_mutex_held = 1; |
| } |
| |
| return NGX_OK; |
| } |
| |
| if (ngx_accept_mutex_held) { |
| if (ngx_disable_accept_events(cycle) == NGX_ERROR) { |
| return NGX_ERROR; |
| } |
| |
| ngx_accept_mutex_held = 0; |
| } |
| |
| return NGX_OK; |
| } |
| |
| |
| ngx_int_t ngx_enable_accept_events(ngx_cycle_t *cycle) |
| { |
| ngx_uint_t i; |
| ngx_listening_t *s; |
| |
| s = cycle->listening.elts; |
| for (i = 0; i < cycle->listening.nelts; i++) { |
| |
| /* |
| * we do not need to handle the Winsock sockets here (divde a socket |
| * number by 4) because this function would never called |
| * in the Winsock environment |
| */ |
| |
| if (ngx_event_flags & NGX_USE_SIGIO_EVENT) { |
| if (ngx_add_conn(&cycle->connections[s[i].fd]) == NGX_ERROR) { |
| return NGX_ERROR; |
| } |
| |
| } else { |
| if (ngx_add_event(&cycle->read_events[s[i].fd], NGX_READ_EVENT, 0) |
| == NGX_ERROR) |
| { |
| return NGX_ERROR; |
| } |
| } |
| } |
| |
| return NGX_OK; |
| } |
| |
| |
| ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle) |
| { |
| ngx_uint_t i; |
| ngx_listening_t *s; |
| |
| s = cycle->listening.elts; |
| for (i = 0; i < cycle->listening.nelts; i++) { |
| |
| /* |
| * we do not need to handle the Winsock sockets here (divde a socket |
| * number by 4) because this function would never called |
| * in the Winsock environment |
| */ |
| |
| if (ngx_event_flags & NGX_USE_SIGIO_EVENT) { |
| if (ngx_del_conn(&cycle->connections[s[i].fd], NGX_DISABLE_EVENT) |
| == NGX_ERROR) |
| { |
| return NGX_ERROR; |
| } |
| |
| } else { |
| if (ngx_del_event(&cycle->read_events[s[i].fd], NGX_READ_EVENT, |
| NGX_DISABLE_EVENT) == NGX_ERROR) |
| { |
| return NGX_ERROR; |
| } |
| } |
| } |
| |
| return NGX_OK; |
| } |
| |
| |
| static size_t ngx_accept_log_error(void *data, char *buf, size_t len) |
| { |
| ngx_accept_log_ctx_t *ctx = data; |
| |
| return ngx_snprintf(buf, len, " while accept() on %s", ctx->name); |
| } |
