Skeleton of router configuration and request processing.

src/nxt_conn_close.c

@@ -0,0 +1,159 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) NGINX, Inc.
+ */
+
+#include <nxt_main.h>
+
+
+static void nxt_conn_shutdown_handler(nxt_task_t *task, void *obj, void *data);
+static void nxt_conn_close_handler(nxt_task_t *task, void *obj, void *data);
+static void nxt_conn_close_timer_handler(nxt_task_t *task, void *obj,
+    void *data);
+static void nxt_conn_close_error_ignore(nxt_task_t *task, void *obj,
+    void *data);
+
+
+void
+nxt_event_conn_close(nxt_event_engine_t *engine, nxt_event_conn_t *c)
+{
+    int                 ret;
+    socklen_t           len;
+    struct linger       linger;
+    nxt_work_queue_t    *wq;
+    nxt_work_handler_t  handler;
+
+    nxt_debug(c->socket.task, "conn close fd:%d, to:%d",
+              c->socket.fd, c->socket.timedout);
+
+    if (c->socket.timedout) {
+        /*
+         * Resetting of timed out connection on close
+         * releases kernel memory associated with socket.
+         * This also causes sending TCP/IP RST to a peer.
+         */
+        linger.l_onoff = 1;
+        linger.l_linger = 0;
+        len = sizeof(struct linger);
+
+        ret = setsockopt(c->socket.fd, SOL_SOCKET, SO_LINGER, &linger, len);
+
+        if (nxt_slow_path(ret != 0)) {
+            nxt_log(c->socket.task, NXT_LOG_CRIT,
+                    "setsockopt(%d, SO_LINGER) failed %E",
+                    c->socket.fd, nxt_socket_errno);
+        }
+    }
+
+    /*
+     * Event errors should be ignored here to avoid repeated nxt_conn_close()
+     * calls.  nxt_conn_close_handler() or nxt_conn_close_timer_handler()
+     * will eventually close socket.
+     */
+    c->socket.error_handler = nxt_conn_close_error_ignore;
+
+    if (c->socket.error == 0 && !c->socket.closed && !c->socket.shutdown) {
+        wq = &engine->shutdown_work_queue;
+        handler = nxt_conn_shutdown_handler;
+
+    } else{
+        wq = &engine->close_work_queue;
+        handler = nxt_conn_close_handler;
+    }
+
+    nxt_work_queue_add(wq, handler, c->socket.task, c, engine);
+}
+
+
+static void
+nxt_conn_shutdown_handler(nxt_task_t *task, void *obj, void *data)
+{
+    nxt_event_conn_t    *c;
+    nxt_event_engine_t  *engine;
+
+    c = obj;
+    engine = data;
+
+    nxt_debug(task, "conn shutdown handler fd:%d", c->socket.fd);
+
+    c->socket.shutdown = 1;
+
+    nxt_socket_shutdown(task, c->socket.fd, SHUT_RDWR);
+
+    nxt_work_queue_add(&engine->close_work_queue, nxt_conn_close_handler,
+                       task, c, engine);
+}
+
+
+static void
+nxt_conn_close_handler(nxt_task_t *task, void *obj, void *data)
+{
+    nxt_uint_t          events_pending, timers_pending;
+    nxt_event_conn_t    *c;
+    nxt_event_engine_t  *engine;
+
+    c = obj;
+    engine = data;
+
+    nxt_debug(task, "conn close handler fd:%d", c->socket.fd);
+
+    /*
+     * Socket should be closed only after all pending socket event operations
+     * will be processed by the kernel.  This could be achieved with zero-timer
+     * handler.  Pending timer operations associated with the socket are
+     * processed before going to the kernel.
+     */
+
+    timers_pending = nxt_timer_delete(engine, &c->read_timer);
+    timers_pending += nxt_timer_delete(engine, &c->write_timer);
+
+    events_pending = nxt_fd_event_close(engine, &c->socket);
+
+    if (events_pending == 0) {
+        nxt_socket_close(task, c->socket.fd);
+        c->socket.fd = -1;
+
+        if (timers_pending == 0) {
+            nxt_work_queue_add(&engine->fast_work_queue,
+                               c->write_state->ready_handler,
+                               task, c, c->socket.data);
+            return;
+        }
+    }
+
+    c->write_timer.handler = nxt_conn_close_timer_handler;
+    c->write_timer.work_queue = &engine->fast_work_queue;
+
+    nxt_timer_add(engine, &c->write_timer, 0);
+}
+
+
+static void
+nxt_conn_close_timer_handler(nxt_task_t *task, void *obj, void *data)
+{
+    nxt_timer_t       *timer;
+    nxt_event_conn_t  *c;
+
+    timer = obj;
+
+    c = nxt_event_write_timer_conn(timer);
+
+    nxt_debug(task, "conn close timer handler fd:%d", c->socket.fd);
+
+    if (c->socket.fd != -1) {
+        nxt_socket_close(task, c->socket.fd);
+        c->socket.fd = -1;
+    }
+
+    nxt_work_queue_add(&task->thread->engine->fast_work_queue,
+                       c->write_state->ready_handler,
+                       task, c, c->socket.data);
+}
+
+
+static void
+nxt_conn_close_error_ignore(nxt_task_t *task, void *obj, void *data)
+{
+    nxt_debug(task, "conn close error ignore");
+}