430 lines
9.3 KiB
C
430 lines
9.3 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) NGINX, Inc.
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*/
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#include <nxt_main.h>
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static void nxt_conn_write_timer_handler(nxt_task_t *task, void *obj,
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void *data);
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void
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nxt_conn_io_write(nxt_task_t *task, void *obj, void *data)
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{
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ssize_t ret;
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nxt_buf_t *b;
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nxt_conn_t *c;
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nxt_sendbuf_t sb;
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nxt_event_engine_t *engine;
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c = obj;
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nxt_debug(task, "conn write fd:%d", c->socket.fd);
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if (c->socket.error != 0) {
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goto error;
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}
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if (!c->socket.write_ready || c->write == NULL) {
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return;
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}
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engine = task->thread->engine;
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c->socket.write_handler = nxt_conn_io_write;
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c->socket.error_handler = c->write_state->error_handler;
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b = c->write;
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sb.socket = c->socket.fd;
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sb.error = 0;
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sb.sent = 0;
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sb.size = 0;
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sb.buf = b;
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sb.limit = 10 * 1024 * 1024;
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sb.ready = 1;
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sb.sync = 0;
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do {
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ret = nxt_conn_io_sendbuf(task, &sb);
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c->socket.write_ready = sb.ready;
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c->socket.error = sb.error;
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if (ret < 0) {
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/* ret == NXT_AGAIN || ret == NXT_ERROR. */
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break;
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}
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sb.sent += ret;
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sb.limit -= ret;
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b = nxt_sendbuf_update(b, ret);
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if (b == NULL) {
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nxt_fd_event_block_write(engine, &c->socket);
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break;
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}
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sb.buf = b;
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if (!c->socket.write_ready) {
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ret = NXT_AGAIN;
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break;
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}
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} while (sb.limit != 0);
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nxt_debug(task, "event conn: %z sent:%O", ret, sb.sent);
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if (sb.sent != 0) {
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if (c->write_state->timer_autoreset) {
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nxt_timer_disable(engine, &c->write_timer);
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}
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}
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if (ret != NXT_ERROR) {
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if (sb.limit == 0) {
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/*
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* Postpone writing until next event poll to allow to
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* process other recevied events and to get new events.
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*/
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c->write_timer.handler = nxt_conn_write_timer_handler;
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nxt_timer_add(engine, &c->write_timer, 0);
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} else if (ret == NXT_AGAIN) {
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/*
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* SSL libraries can require to toggle either write or read
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* event if renegotiation occurs during SSL write operation.
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* This case is handled on the event_io->send() level. Timer
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* can be set here because it should be set only for write
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* direction.
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*/
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nxt_conn_timer(engine, c, c->write_state, &c->write_timer);
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if (nxt_fd_event_is_disabled(c->socket.write)) {
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nxt_fd_event_enable_write(engine, &c->socket);
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}
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}
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}
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if (ret == 0 || sb.sent != 0) {
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/*
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* ret == 0 means a sync buffer was processed.
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* ret == NXT_ERROR is ignored here if some data was sent,
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* the error will be handled on the next nxt_conn_write() call.
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*/
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c->sent += sb.sent;
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nxt_work_queue_add(c->write_work_queue, c->write_state->ready_handler,
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task, c, data);
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return;
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}
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/* ret == NXT_ERROR */
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nxt_fd_event_block_write(engine, &c->socket);
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error:
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nxt_work_queue_add(c->write_work_queue, c->write_state->error_handler,
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task, c, data);
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}
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static void
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nxt_conn_write_timer_handler(nxt_task_t *task, void *obj, void *data)
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{
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nxt_conn_t *c;
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nxt_timer_t *timer;
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timer = obj;
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nxt_debug(task, "conn write timer");
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c = nxt_write_timer_conn(timer);
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c->delayed = 0;
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c->io->write(task, c, c->socket.data);
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}
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ssize_t
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nxt_conn_io_sendbuf(nxt_task_t *task, nxt_sendbuf_t *sb)
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{
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nxt_uint_t niov;
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struct iovec iov[NXT_IOBUF_MAX];
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niov = nxt_sendbuf_mem_coalesce0(task, sb, iov, NXT_IOBUF_MAX);
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if (niov == 0 && sb->sync) {
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return 0;
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}
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return nxt_conn_io_writev(task, sb, iov, niov);
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}
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ssize_t
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nxt_conn_io_writev(nxt_task_t *task, nxt_sendbuf_t *sb, struct iovec *iov,
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nxt_uint_t niov)
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{
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ssize_t n;
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nxt_err_t err;
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if (niov == 1) {
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/* Disposal of surplus kernel iovec copy-in operation. */
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return nxt_conn_io_send(task, sb, iov[0].iov_base, iov[0].iov_len);
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}
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for ( ;; ) {
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n = writev(sb->socket, iov, niov);
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err = (n == -1) ? nxt_socket_errno : 0;
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nxt_debug(task, "writev(%d, %ui): %z", sb->socket, niov, n);
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if (n > 0) {
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return n;
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}
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/* n == -1 */
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switch (err) {
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case NXT_EAGAIN:
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sb->ready = 0;
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nxt_debug(task, "writev() %E", err);
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return NXT_AGAIN;
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case NXT_EINTR:
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nxt_debug(task, "writev() %E", err);
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continue;
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default:
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sb->error = err;
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nxt_log(task, nxt_socket_error_level(err),
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"writev(%d, %ui) failed %E", sb->socket, niov, err);
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return NXT_ERROR;
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}
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}
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}
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ssize_t
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nxt_conn_io_send(nxt_task_t *task, nxt_sendbuf_t *sb, void *buf, size_t size)
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{
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ssize_t n;
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nxt_err_t err;
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for ( ;; ) {
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n = send(sb->socket, buf, size, 0);
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err = (n == -1) ? nxt_socket_errno : 0;
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nxt_debug(task, "send(%d, %p, %uz): %z", sb->socket, buf, size, n);
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if (n > 0) {
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return n;
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}
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/* n == -1 */
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switch (err) {
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case NXT_EAGAIN:
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sb->ready = 0;
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nxt_debug(task, "send() %E", err);
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return NXT_AGAIN;
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case NXT_EINTR:
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nxt_debug(task, "send() %E", err);
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continue;
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default:
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sb->error = err;
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nxt_log(task, nxt_socket_error_level(err),
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"send(%d, %p, %uz) failed %E", sb->socket, buf, size, err);
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return NXT_ERROR;
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}
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}
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}
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/* Obsolete interfaces. */
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size_t
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nxt_event_conn_write_limit(nxt_conn_t *c)
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{
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ssize_t limit, correction;
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nxt_event_write_rate_t *rate;
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rate = c->rate;
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if (rate == NULL) {
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return c->max_chunk;
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}
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limit = rate->limit;
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correction = limit - (size_t) rate->average;
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nxt_debug(c->socket.task, "event conn correction:%z average:%0.3f",
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correction, rate->average);
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limit += correction;
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if (limit <= 0) {
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return 0;
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}
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if (rate->limit_after != 0) {
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limit += rate->limit_after;
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limit = nxt_min((size_t) limit, rate->max_limit);
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}
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return nxt_min((size_t) limit, c->max_chunk);
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}
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nxt_bool_t
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nxt_event_conn_write_delayed(nxt_event_engine_t *engine, nxt_conn_t *c,
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size_t sent)
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{
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return 0;
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}
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ssize_t
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nxt_event_conn_io_write_chunk(nxt_conn_t *c, nxt_buf_t *b, size_t limit)
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{
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ssize_t ret;
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ret = c->io->sendbuf(c, b, limit);
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if ((ret == NXT_AGAIN || !c->socket.write_ready)
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&& nxt_fd_event_is_disabled(c->socket.write))
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{
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nxt_fd_event_enable_write(c->socket.task->thread->engine, &c->socket);
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}
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return ret;
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}
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ssize_t
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nxt_event_conn_io_sendbuf(nxt_conn_t *c, nxt_buf_t *b, size_t limit)
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{
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nxt_uint_t niob;
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struct iovec iob[NXT_IOBUF_MAX];
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nxt_sendbuf_coalesce_t sb;
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sb.buf = b;
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sb.iobuf = iob;
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sb.nmax = NXT_IOBUF_MAX;
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sb.sync = 0;
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sb.size = 0;
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sb.limit = limit;
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niob = nxt_sendbuf_mem_coalesce(c->socket.task, &sb);
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if (niob == 0 && sb.sync) {
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return 0;
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}
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return nxt_event_conn_io_writev(c, iob, niob);
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}
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ssize_t
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nxt_event_conn_io_writev(nxt_conn_t *c, nxt_iobuf_t *iob, nxt_uint_t niob)
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{
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ssize_t n;
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nxt_err_t err;
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if (niob == 1) {
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/* Disposal of surplus kernel iovec copy-in operation. */
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return nxt_event_conn_io_send(c, iob->iov_base, iob->iov_len);
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}
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for ( ;; ) {
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n = writev(c->socket.fd, iob, niob);
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err = (n == -1) ? nxt_socket_errno : 0;
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nxt_debug(c->socket.task, "writev(%d, %ui): %z", c->socket.fd, niob, n);
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if (n > 0) {
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return n;
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}
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/* n == -1 */
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switch (err) {
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case NXT_EAGAIN:
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nxt_debug(c->socket.task, "writev() %E", err);
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c->socket.write_ready = 0;
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return NXT_AGAIN;
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case NXT_EINTR:
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nxt_debug(c->socket.task, "writev() %E", err);
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continue;
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default:
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c->socket.error = err;
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nxt_log(c->socket.task, nxt_socket_error_level(err),
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"writev(%d, %ui) failed %E", c->socket.fd, niob, err);
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return NXT_ERROR;
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}
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}
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}
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ssize_t
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nxt_event_conn_io_send(nxt_conn_t *c, void *buf, size_t size)
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{
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ssize_t n;
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nxt_err_t err;
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for ( ;; ) {
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n = send(c->socket.fd, buf, size, 0);
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err = (n == -1) ? nxt_socket_errno : 0;
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nxt_debug(c->socket.task, "send(%d, %p, %uz): %z",
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c->socket.fd, buf, size, n);
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if (n > 0) {
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return n;
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}
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/* n == -1 */
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switch (err) {
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case NXT_EAGAIN:
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nxt_debug(c->socket.task, "send() %E", err);
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c->socket.write_ready = 0;
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return NXT_AGAIN;
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case NXT_EINTR:
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nxt_debug(c->socket.task, "send() %E", err);
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continue;
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default:
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c->socket.error = err;
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nxt_log(c->socket.task, nxt_socket_error_level(err),
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"send(%d, %p, %uz) failed %E",
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c->socket.fd, buf, size, err);
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return NXT_ERROR;
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}
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}
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}
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