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/*
* Copyright (C) Igor Sysoev
* Copyright (C) NGINX, Inc.
*/
#include <nxt_main.h>
void
nxt_conn_wait(nxt_conn_t *c)
{
nxt_event_engine_t *engine;
const nxt_conn_state_t *state;
nxt_debug(c->socket.task, "conn wait fd:%d rdy:%d",
c->socket.fd, c->socket.read_ready);
engine = c->socket.task->thread->engine;
state = c->read_state;
if (c->socket.read_ready) {
nxt_work_queue_add(&engine->fast_work_queue, state->ready_handler,
c->socket.task, c, c->socket.data);
return;
}
c->socket.read_handler = state->ready_handler;
c->socket.error_handler = state->error_handler;
nxt_conn_timer(engine, c, state, &c->read_timer);
nxt_fd_event_enable_read(engine, &c->socket);
}
void
nxt_conn_io_read(nxt_task_t *task, void *obj, void *data)
{
ssize_t n;
nxt_conn_t *c;
nxt_work_queue_t *wq;
nxt_event_engine_t *engine;
nxt_work_handler_t handler;
const nxt_conn_state_t *state;
c = obj;
nxt_debug(task, "conn read fd:%d rdy:%d cl:%d",
c->socket.fd, c->socket.read_ready, c->socket.closed);
engine = task->thread->engine;
state = c->read_state;
if (c->socket.read_ready) {
if (state->io_read_handler == NULL) {
n = c->io->recvbuf(c, c->read);
} else {
n = state->io_read_handler(c);
/* The state can be changed by io_read_handler. */
state = c->read_state;
}
if (n > 0) {
c->nbytes = n;
nxt_recvbuf_update(c->read, n);
nxt_fd_event_block_read(engine, &c->socket);
if (state->timer_autoreset) {
nxt_timer_disable(engine, &c->read_timer);
}
wq = c->read_work_queue;
handler = state->ready_handler;
nxt_work_queue_add(wq, handler, task, c, data);
return;
}
if (n != NXT_AGAIN) {
nxt_fd_event_block_read(engine, &c->socket);
nxt_timer_disable(engine, &c->read_timer);
wq = &engine->fast_work_queue;
handler = (n == 0) ? state->close_handler : state->error_handler;
nxt_work_queue_add(wq, handler, task, c, data);
return;
}
}
/*
* Here c->io->read() is assigned instead of direct nxt_conn_io_read()
* because the function can be called by nxt_kqueue_conn_io_read().
*/
c->socket.read_handler = c->io->read;
c->socket.error_handler = state->error_handler;
if (c->read_timer.state == NXT_TIMER_DISABLED
|| nxt_fd_event_is_disabled(c->socket.read))
{
/* Timer may be set or reset. */
nxt_conn_timer(engine, c, state, &c->read_timer);
if (nxt_fd_event_is_disabled(c->socket.read)) {
nxt_fd_event_enable_read(engine, &c->socket);
}
}
return;
}
ssize_t
nxt_conn_io_recvbuf(nxt_conn_t *c, nxt_buf_t *b)
{
ssize_t n;
nxt_err_t err;
nxt_uint_t niov;
struct iovec iov[NXT_IOBUF_MAX];
nxt_recvbuf_coalesce_t rb;
rb.buf = b;
rb.iobuf = iov;
rb.nmax = NXT_IOBUF_MAX;
rb.size = 0;
niov = nxt_recvbuf_mem_coalesce(&rb);
if (niov == 1) {
/* Disposal of surplus kernel iovec copy-in operation. */
return nxt_conn_io_recv(c, iov->iov_base, iov->iov_len, 0);
}
for ( ;; ) {
n = readv(c->socket.fd, iov, niov);
err = (n == -1) ? nxt_socket_errno : 0;
nxt_debug(c->socket.task, "readv(%d, %ui): %z", c->socket.fd, niov, n);
if (n > 0) {
if ((size_t) n < rb.size) {
c->socket.read_ready = 0;
}
return n;
}
if (n == 0) {
c->socket.closed = 1;
c->socket.read_ready = 0;
return n;
}
/* n == -1 */
switch (err) {
case NXT_EAGAIN:
nxt_debug(c->socket.task, "readv() %E", err);
c->socket.read_ready = 0;
return NXT_AGAIN;
case NXT_EINTR:
nxt_debug(c->socket.task, "readv() %E", err);
continue;
default:
c->socket.error = err;
nxt_log(c->socket.task, nxt_socket_error_level(err),
"readv(%d, %ui) failed %E", c->socket.fd, niov, err);
return NXT_ERROR;
}
}
}
ssize_t
nxt_conn_io_recv(nxt_conn_t *c, void *buf, size_t size, nxt_uint_t flags)
{
ssize_t n;
nxt_err_t err;
for ( ;; ) {
n = recv(c->socket.fd, buf, size, flags);
err = (n == -1) ? nxt_socket_errno : 0;
nxt_debug(c->socket.task, "recv(%d, %p, %uz, 0x%ui): %z",
c->socket.fd, buf, size, flags, n);
if (n > 0) {
if ((size_t) n < size) {
c->socket.read_ready = 0;
}
return n;
}
if (n == 0) {
c->socket.closed = 1;
c->socket.read_ready = 0;
return n;
}
/* n == -1 */
switch (err) {
case NXT_EAGAIN:
nxt_debug(c->socket.task, "recv() %E", err);
c->socket.read_ready = 0;
return NXT_AGAIN;
case NXT_EINTR:
nxt_debug(c->socket.task, "recv() %E", err);
continue;
default:
c->socket.error = err;
nxt_log(c->socket.task, nxt_socket_error_level(err),
"recv(%d, %p, %uz, %ui) failed %E",
c->socket.fd, buf, size, flags, err);
return NXT_ERROR;
}
}
}
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