int uv_fileno(const uv_handle_t* handle, uv_os_fd_t* fd) {
int fd_out;
switch (handle->type) {
case UV_TCP:
case UV_NAMED_PIPE:
case UV_TTY:
fd_out = uv__stream_fd((uv_stream_t*) handle);
break;
case UV_UDP:
fd_out = ((uv_udp_t *) handle)->io_watcher.fd;
break;
case UV_POLL:
fd_out = ((uv_poll_t *) handle)->io_watcher.fd;
break;
default:
return -EINVAL;
}
if (uv__is_closing(handle) || fd_out == -1)
return -EBADF;
*fd = fd_out;
return 0;
}
int uv__socket_sockopt(uv_handle_t* handle, int optname, int* value) {
int r;
int fd;
socklen_t len;
if (handle == NULL || value == NULL)
return UV_EINVAL;
if (handle->type == UV_TCP || handle->type == UV_NAMED_PIPE)
fd = uv__stream_fd((uv_stream_t*) handle);
else if (handle->type == UV_UDP)
fd = ((uv_udp_t *) handle)->io_watcher.fd;
else
return UV_ENOTSUP;
len = sizeof(*value);
if (*value == 0)
r = getsockopt(fd, SOL_SOCKET, optname, value, &len);
else
r = setsockopt(fd, SOL_SOCKET, optname, (const void*) value, len);
if (r < 0)
return UV__ERR(errno);
return 0;
}
int uv_tcp_nodelay(uv_tcp_t* handle, int on) {
int err;
if (uv__stream_fd(handle) != -1) {
err = uv__tcp_nodelay(uv__stream_fd(handle), on);
if (err)
return err;
}
if (on)
handle->flags |= UV_TCP_NODELAY;
else
handle->flags &= ~UV_TCP_NODELAY;
return 0;
}
/*
* Used for initializing stdio streams like options.stdin_stream. Returns
* zero on success. See also the cleanup section in uv_spawn().
*/
static int uv__process_init_stdio(uv_stdio_container_t* container, int fds[2]) {
int mask;
int fd;
mask = UV_IGNORE | UV_CREATE_PIPE | UV_INHERIT_FD | UV_INHERIT_STREAM;
switch (container->flags & mask) {
case UV_IGNORE:
return 0;
case UV_CREATE_PIPE:
assert(container->data.stream != NULL);
if (container->data.stream->type != UV_NAMED_PIPE)
return -EINVAL;
else
return uv__make_socketpair(fds, 0);
case UV_INHERIT_FD:
case UV_INHERIT_STREAM:
if (container->flags & UV_INHERIT_FD)
fd = container->data.fd;
else
fd = uv__stream_fd(container->data.stream);
if (fd == -1)
return -EINVAL;
fds[1] = fd;
return 0;
default:
assert(0 && "Unexpected flags");
return -EINVAL;
}
}
static void uv__drain(uv_stream_t* stream) {
uv_shutdown_t* req;
assert(ngx_queue_empty(&stream->write_queue));
assert(stream->write_queue_size == 0);
uv__io_stop(stream->loop, &stream->io_watcher, UV__POLLOUT);
/* Shutdown? */
if ((stream->flags & UV_STREAM_SHUTTING) &&
!(stream->flags & UV_CLOSING) &&
!(stream->flags & UV_STREAM_SHUT)) {
assert(stream->shutdown_req);
req = stream->shutdown_req;
stream->shutdown_req = NULL;
uv__req_unregister(stream->loop, req);
if (shutdown(uv__stream_fd(stream), SHUT_WR)) {
/* Error. Report it. User should call uv_close(). */
uv__set_sys_error(stream->loop, errno);
if (req->cb) {
req->cb(req, -1);
}
} else {
uv__set_sys_error(stream->loop, 0);
((uv_handle_t*) stream)->flags |= UV_STREAM_SHUT;
if (req->cb) {
req->cb(req, 0);
}
}
}
}
/**
* We get called here from directly following a call to connect(2).
* In order to determine if we've errored out or succeeded must call
* getsockopt.
*/
static void uv__stream_connect(uv_stream_t* stream) {
int error;
uv_connect_t* req = stream->connect_req;
socklen_t errorsize = sizeof(int);
assert(stream->type == UV_TCP || stream->type == UV_NAMED_PIPE);
assert(req);
if (stream->delayed_error) {
/* To smooth over the differences between unixes errors that
* were reported synchronously on the first connect can be delayed
* until the next tick--which is now.
*/
error = stream->delayed_error;
stream->delayed_error = 0;
} else {
/* Normal situation: we need to get the socket error from the kernel. */
assert(uv__stream_fd(stream) >= 0);
tuvp_getsockopt(uv__stream_fd(stream),
SOL_SOCKET,
SO_ERROR,
&error,
&errorsize);
error = -error;
}
if (error == -EINPROGRESS)
return;
stream->connect_req = NULL;
uv__req_unregister(stream->loop, req);
if (error < 0 || QUEUE_EMPTY(&stream->write_queue)) {
uv__io_stop(stream->loop, &stream->io_watcher, UV__POLLOUT);
}
if (req->cb)
req->cb(req, error);
if (uv__stream_fd(stream) == -1)
return;
if (error < 0) {
uv__stream_flush_write_queue(stream, -ECANCELED);
uv__write_callbacks(stream);
}
}
static int maybe_new_socket(uv_tcp_t* handle, int domain, unsigned long flags) {
struct sockaddr_storage saddr;
socklen_t slen;
if (domain == AF_UNSPEC) {
handle->flags |= flags;
return 0;
}
if (uv__stream_fd(handle) != -1) {
if (flags & UV_HANDLE_BOUND) {
if (handle->flags & UV_HANDLE_BOUND) {
/* It is already bound to a port. */
handle->flags |= flags;
return 0;
}
/* Query to see if tcp socket is bound. */
slen = sizeof(saddr);
memset(&saddr, 0, sizeof(saddr));
if (getsockname(uv__stream_fd(handle), (struct sockaddr*) &saddr, &slen))
return -errno;
if ((saddr.ss_family == AF_INET6 &&
((struct sockaddr_in6*) &saddr)->sin6_port != 0) ||
(saddr.ss_family == AF_INET &&
((struct sockaddr_in*) &saddr)->sin_port != 0)) {
/* Handle is already bound to a port. */
handle->flags |= flags;
return 0;
}
/* Bind to arbitrary port */
if (bind(uv__stream_fd(handle), (struct sockaddr*) &saddr, slen))
return -errno;
}
handle->flags |= flags;
return 0;
}
return new_socket(handle, domain, flags);
}
int uv_device_ioctl(uv_device_t* device, int cmd, uv_ioargs_t* args) {
int err;
err = ioctl(uv__stream_fd((uv_stream_t*) device), cmd, args->arg);
if (err < 0)
return -errno;
return err;
}
int uv_device_ioctl(uv_device_t* device,
unsigned long cmd,
uv_ioargs_t* args) {
int err = ioctl(uv__stream_fd((uv_stream_t*) device), cmd, args->arg);
if (err < 0) {
return -errno;
}
return err;
}
int uv__tcp_connect(uv_connect_t* req,
uv_tcp_t* handle,
const struct sockaddr* addr,
unsigned int addrlen,
uv_connect_cb cb) {
int err;
int r;
assert(handle->type == UV_TCP);
if (handle->connect_req != NULL)
return -EALREADY; /* FIXME(bnoordhuis) -EINVAL or maybe -EBUSY. */
err = maybe_new_socket(handle,
addr->sa_family,
UV_STREAM_READABLE | UV_STREAM_WRITABLE);
if (err)
return err;
handle->delayed_error = 0;
do {
errno = 0;
r = connect(uv__stream_fd(handle), addr, addrlen);
} while (r == -1 && errno == EINTR);
/* We not only check the return value, but also check the errno != 0.
* Because in rare cases connect() will return -1 but the errno
* is 0 (for example, on Android 4.3, OnePlus phone A0001_12_150227)
* and actually the tcp three-way handshake is completed.
*/
if (r == -1 && errno != 0) {
if (errno == EINPROGRESS)
; /* not an error */
else if (errno == ECONNREFUSED)
/* If we get a ECONNREFUSED wait until the next tick to report the
* error. Solaris wants to report immediately--other unixes want to
* wait.
*/
handle->delayed_error = -errno;
else
return -errno;
}
uv__req_init(handle->loop, req, UV_CONNECT);
req->cb = cb;
req->handle = (uv_stream_t*) handle;
QUEUE_INIT(&req->queue);
handle->connect_req = req;
uv__io_start(handle->loop, &handle->io_watcher, POLLOUT);
if (handle->delayed_error)
uv__io_feed(handle->loop, &handle->io_watcher);
return 0;
}
void uv__server_io(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
uv_stream_t* stream;
int err;
stream = container_of(w, uv_stream_t, io_watcher);
assert(events == UV__POLLIN);
assert(stream->accepted_fd == -1);
assert(!(stream->flags & UV_CLOSING));
uv__io_start(stream->loop, &stream->io_watcher, UV__POLLIN);
/* connection_cb can close the server socket while we're
* in the loop so check it on each iteration.
*/
while (uv__stream_fd(stream) != -1) {
assert(stream->accepted_fd == -1);
set_errno(0);
err = uv__accept(uv__stream_fd(stream));
if (err < 0) {
if (err == -EAGAIN || err == -EWOULDBLOCK)
return; /* Not an error. */
if (err == -ECONNABORTED)
continue; /* Ignore. Nothing we can do about that. */
stream->connection_cb(stream, err);
continue;
}
stream->accepted_fd = err;
stream->connection_cb(stream, 0);
if (stream->accepted_fd != -1) {
/* The user hasn't yet accepted called uv_accept() */
uv__io_stop(loop, &stream->io_watcher, UV__POLLIN);
return;
}
/* done accept for mbed */
break;
}
}
int uv_pipe_bind(uv_pipe_t* handle, const char* name) {
struct sockaddr_un saddr;
const char* pipe_fname;
int sockfd;
int err;
size_t name_len;
pipe_fname = NULL;
sockfd = -1;
name_len = strlen(name);
if (name_len > sizeof(saddr.sun_path) - 1)
return -ENAMETOOLONG;
/* Already bound? */
if (uv__stream_fd(handle) >= 0)
return -EINVAL;
/* Make a copy of the file name, it outlives this function's scope. */
pipe_fname = uv__strdup(name);
if (pipe_fname == NULL)
return -ENOMEM;
/* We've got a copy, don't touch the original any more. */
name = NULL;
err = uv__socket(AF_UNIX, SOCK_STREAM, 0);
if (err < 0)
goto err_socket;
sockfd = err;
memset(&saddr, 0, sizeof saddr);
memcpy(saddr.sun_path, pipe_fname, name_len);
saddr.sun_family = AF_UNIX;
if (bind(sockfd, (struct sockaddr*)&saddr, sizeof saddr)) {
err = -errno;
/* Convert ENOENT to EACCES for compatibility with Windows. */
if (err == -ENOENT)
err = -EACCES;
uv__close(sockfd);
goto err_socket;
}
/* Success. */
handle->flags |= UV_HANDLE_BOUND;
handle->pipe_fname = pipe_fname; /* Is a strdup'ed copy. */
handle->io_watcher.fd = sockfd;
return 0;
err_socket:
uv__free((void*)pipe_fname);
return err;
}
int uv_tty_get_winsize(uv_tty_t* tty, int* width, int* height) {
struct winsize ws;
if (ioctl(uv__stream_fd(tty), TIOCGWINSZ, &ws))
return -errno;
*width = ws.ws_col;
*height = ws.ws_row;
return 0;
}
int uv_tcp_v6only(uv_tcp_t* handle, int on) {
if (uv__stream_fd(handle) != -1)
return -1;
if (on)
handle->flags |= UV_TCP_V6ONLY;
else
handle->flags &= ~UV_TCP_V6ONLY;
return 0;
}
int uv_tcp_getpeername(uv_tcp_t* handle,
struct sockaddr* name,
int* namelen) {
socklen_t socklen;
if (handle->delayed_error)
return handle->delayed_error;
if (uv__stream_fd(handle) < 0)
return -EINVAL; /* FIXME(bnoordhuis) -EBADF */
/* sizeof(socklen_t) != sizeof(int) on some systems. */
socklen = (socklen_t) *namelen;
if (getpeername(uv__stream_fd(handle), name, &socklen))
return -errno;
*namelen = (int) socklen;
return 0;
}
int uv_tcp_getpeername(uv_tcp_t* handle,
struct sockaddr* name,
int* namelen) {
socklen_t socklen;
if (handle->delayed_error)
return uv__set_sys_error(handle->loop, handle->delayed_error);
if (uv__stream_fd(handle) < 0)
return uv__set_sys_error(handle->loop, EINVAL);
/* sizeof(socklen_t) != sizeof(int) on some systems. */
socklen = (socklen_t) *namelen;
if (getpeername(uv__stream_fd(handle), name, &socklen) == -1)
return uv__set_sys_error(handle->loop, errno);
*namelen = (int) socklen;
return 0;
}
int uv_pipe_listen(uv_pipe_t* handle, int backlog, uv_connection_cb cb) {
if (uv__stream_fd(handle) == -1)
return -EINVAL;
#if defined(__MVS__)
/* On zOS, backlog=0 has undefined behaviour */
if (backlog == 0)
backlog = 1;
else if (backlog < 0)
backlog = SOMAXCONN;
#endif
if (listen(uv__stream_fd(handle), backlog))
return -errno;
handle->connection_cb = cb;
handle->io_watcher.cb = uv__server_io;
uv__io_start(handle->loop, &handle->io_watcher, POLLIN);
return 0;
}
int uv_tcp_keepalive(uv_tcp_t* handle, int on, unsigned int delay) {
int err;
if (uv__stream_fd(handle) != -1) {
err =uv__tcp_keepalive(uv__stream_fd(handle), on, delay);
if (err)
return err;
}
if (on)
handle->flags |= UV_TCP_KEEPALIVE;
else
handle->flags &= ~UV_TCP_KEEPALIVE;
/* TODO Store delay if uv__stream_fd(handle) == -1 but don't want to enlarge
* uv_tcp_t with an int that's almost never used...
*/
return 0;
}
int uv_tty_get_winsize(uv_tty_t* tty, int* width, int* height) {
struct winsize ws;
if (ioctl(uv__stream_fd(tty), TIOCGWINSZ, &ws) < 0) {
uv__set_sys_error(tty->loop, errno);
return -1;
}
*width = ws.ws_col;
*height = ws.ws_row;
return 0;
}
static int uv__connect(uv_connect_t* req,
uv_tcp_t* handle,
struct sockaddr* addr,
socklen_t addrlen,
uv_connect_cb cb) {
int err;
int r;
assert(handle->type == UV_TCP);
if (handle->connect_req != NULL)
return -EALREADY; /* FIXME(bnoordhuis) -EINVAL or maybe -EBUSY. */
err = maybe_new_socket(handle,
addr->sa_family,
UV_STREAM_READABLE | UV_STREAM_WRITABLE);
if (err)
return err;
handle->delayed_error = 0;
do
r = connect(uv__stream_fd(handle), addr, addrlen);
while (r == -1 && errno == EINTR);
if (r == -1) {
if (errno == EINPROGRESS)
; /* not an error */
else if (errno == ECONNREFUSED)
/* If we get a ECONNREFUSED wait until the next tick to report the
* error. Solaris wants to report immediately--other unixes want to
* wait.
*/
handle->delayed_error = -errno;
else
return -errno;
}
uv__req_init(handle->loop, req, UV_CONNECT);
req->cb = cb;
req->handle = (uv_stream_t*) handle;
QUEUE_INIT(&req->queue);
handle->connect_req = req;
uv__io_start(handle->loop, &handle->io_watcher, UV__POLLOUT);
if (handle->delayed_error)
uv__io_feed(handle->loop, &handle->io_watcher);
return 0;
}
int uv_tty_set_mode(uv_tty_t* tty, int mode) {
struct termios raw;
int fd;
fd = uv__stream_fd(tty);
if (mode && tty->mode == 0) {
/* on */
if (tcgetattr(fd, &tty->orig_termios)) {
goto fatal;
}
/* This is used for uv_tty_reset_mode() */
if (orig_termios_fd == -1) {
orig_termios = tty->orig_termios;
orig_termios_fd = fd;
}
raw = tty->orig_termios;
raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
raw.c_oflag |= (ONLCR);
raw.c_cflag |= (CS8);
raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
raw.c_cc[VMIN] = 1;
raw.c_cc[VTIME] = 0;
/* Put terminal in raw mode after draining */
if (tcsetattr(fd, TCSADRAIN, &raw)) {
goto fatal;
}
tty->mode = 1;
return 0;
} else if (mode == 0 && tty->mode) {
/* off */
/* Put terminal in original mode after flushing */
if (tcsetattr(fd, TCSAFLUSH, &tty->orig_termios)) {
goto fatal;
}
tty->mode = 0;
return 0;
}
fatal:
uv__set_sys_error(tty->loop, errno);
return -1;
}
/**
* We get called here from directly following a call to connect(2).
* In order to determine if we've errored out or succeeded must call
* getsockopt.
*/
static void uv__stream_connect(uv_stream_t* stream) {
int error;
uv_connect_t* req = stream->connect_req;
socklen_t errorsize = sizeof(int);
assert(stream->type == UV_TCP || stream->type == UV_NAMED_PIPE);
assert(req);
if (stream->delayed_error) {
/* To smooth over the differences between unixes errors that
* were reported synchronously on the first connect can be delayed
* until the next tick--which is now.
*/
error = stream->delayed_error;
stream->delayed_error = 0;
} else {
/* Normal situation: we need to get the socket error from the kernel. */
assert(uv__stream_fd(stream) >= 0);
getsockopt(uv__stream_fd(stream),
SOL_SOCKET,
SO_ERROR,
&error,
&errorsize);
}
if (error == EINPROGRESS)
return;
stream->connect_req = NULL;
uv__req_unregister(stream->loop, req);
if (req->cb) {
uv__set_sys_error(stream->loop, error);
req->cb(req, error ? -1 : 0);
}
}
static int new_socket(uv_tcp_t* handle, int domain, unsigned long flags) {
struct sockaddr_storage saddr;
socklen_t slen;
int sockfd;
int err;
err = uv__socket(domain, SOCK_STREAM, 0);
if (err < 0)
return err;
sockfd = err;
err = uv__stream_open((uv_stream_t*) handle, sockfd, flags);
if (err) {
uv__close(sockfd);
return err;
}
if (flags & UV_HANDLE_BOUND) {
/* Bind this new socket to an arbitrary port */
slen = sizeof(saddr);
memset(&saddr, 0, sizeof(saddr));
err = getsockname(uv__stream_fd(handle), (struct sockaddr*) &saddr, &slen);
if (err) {
uv__close(sockfd);
return err;
}
err = bind(uv__stream_fd(handle), (struct sockaddr*) &saddr, slen);
if (err) {
uv__close(sockfd);
return err;
}
}
return 0;
}
int uv_tty_get_winsize(uv_tty_t* tty, int* width, int* height) {
struct winsize ws;
int err;
do
err = ioctl(uv__stream_fd(tty), TIOCGWINSZ, &ws);
while (err == -1 && errno == EINTR);
if (err == -1)
return UV__ERR(errno);
*width = ws.ws_col;
*height = ws.ws_row;
return 0;
}
int uv_tty_set_mode(uv_tty_t* tty, uv_tty_mode_t mode) {
struct termios tmp;
int fd;
if (tty->mode == (int) mode)
return 0;
fd = uv__stream_fd(tty);
if (tty->mode == UV_TTY_MODE_NORMAL && mode != UV_TTY_MODE_NORMAL) {
if (tcgetattr(fd, &tty->orig_termios))
return -errno;
/* This is used for uv_tty_reset_mode() */
uv_spinlock_lock(&termios_spinlock);
if (orig_termios_fd == -1) {
orig_termios = tty->orig_termios;
orig_termios_fd = fd;
}
uv_spinlock_unlock(&termios_spinlock);
}
tmp = tty->orig_termios;
switch (mode) {
case UV_TTY_MODE_NORMAL:
break;
case UV_TTY_MODE_RAW:
tmp.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
tmp.c_oflag |= (ONLCR);
tmp.c_cflag |= (CS8);
tmp.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
tmp.c_cc[VMIN] = 1;
tmp.c_cc[VTIME] = 0;
break;
case UV_TTY_MODE_IO:
uv__tty_make_raw(&tmp);
break;
}
/* Apply changes after draining */
if (tcsetattr(fd, TCSADRAIN, &tmp))
return -errno;
tty->mode = mode;
return 0;
}
int uv_tty_set_mode(uv_tty_t* tty, int mode) {
struct termios raw;
int fd;
fd = uv__stream_fd(tty);
if (mode && tty->mode == 0) { /* on */
if (tcgetattr(fd, &tty->orig_termios))
return -errno;
/* This is used for uv_tty_reset_mode() */
uv_spinlock_lock(&termios_spinlock);
if (orig_termios_fd == -1) {
orig_termios = tty->orig_termios;
orig_termios_fd = fd;
}
uv_spinlock_unlock(&termios_spinlock);
raw = tty->orig_termios;
#ifdef _BSD_SOURCE
cfmakeraw(&raw);
#else
raw.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
raw.c_oflag &= ~OPOST;
raw.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
raw.c_cflag &= ~(CSIZE | PARENB);
raw.c_cflag |= CS8;
#endif
raw.c_cc[VMIN] = 1;
raw.c_cc[VTIME] = 0;
/* Put terminal in raw mode after draining */
if (tcsetattr(fd, TCSADRAIN, &raw))
return -errno;
tty->mode = 1;
} else if (mode == 0 && tty->mode) { /* off */
/* Put terminal in original mode after flushing */
if (tcsetattr(fd, TCSAFLUSH, &tty->orig_termios))
return -errno;
tty->mode = 0;
}
return 0;
}
static int maybe_new_socket(uv_tcp_t* handle, int domain, int flags) {
int sockfd;
if (uv__stream_fd(handle) != -1)
return 0;
sockfd = uv__socket(domain, SOCK_STREAM, 0);
if (sockfd == -1)
return uv__set_sys_error(handle->loop, errno);
if (uv__stream_open((uv_stream_t*)handle, sockfd, flags)) {
close(sockfd);
return -1;
}
return 0;
}
static int maybe_new_socket(uv_tcp_t* handle, int domain, int flags) {
int sockfd;
int err;
if (uv__stream_fd(handle) != -1)
return 0;
err = uv__socket(domain, SOCK_STREAM, 0);
if (err < 0)
return err;
sockfd = err;
err = uv__stream_open((uv_stream_t*) handle, sockfd, flags);
if (err) {
close(sockfd);
return err;
}
return 0;
}
static int uv__pipe_getsockpeername(const uv_pipe_t* handle,
uv__peersockfunc func,
char* buffer,
size_t* size) {
struct sockaddr_un sa;
socklen_t addrlen;
int err;
addrlen = sizeof(sa);
memset(&sa, 0, addrlen);
err = func(uv__stream_fd(handle), (struct sockaddr*) &sa, &addrlen);
if (err < 0) {
*size = 0;
return -errno;
}
#if defined(__linux__)
if (sa.sun_path[0] == 0)
/* Linux abstract namespace */
addrlen -= offsetof(struct sockaddr_un, sun_path);
else
static int uv__read_start_common(uv_stream_t* stream,
uv_alloc_cb alloc_cb,
uv_read_cb read_cb,
uv_read2_cb read2_cb) {
assert(stream->type == UV_TCP || stream->type == UV_NAMED_PIPE ||
stream->type == UV_TTY);
if (stream->flags & UV_CLOSING) {
uv__set_sys_error(stream->loop, EINVAL);
return -1;
}
/* The UV_STREAM_READING flag is irrelevant of the state of the tcp - it just
* expresses the desired state of the user.
*/
stream->flags |= UV_STREAM_READING;
#if defined(__APPLE__)
/* Notify select() thread about state change */
if (stream->select != NULL)
uv__stream_osx_interrupt_select(stream);
#endif /* defined(__APPLE__) */
/* TODO: try to do the read inline? */
/* TODO: keep track of tcp state. If we've gotten a EOF then we should
* not start the IO watcher.
*/
assert(uv__stream_fd(stream) >= 0);
assert(alloc_cb);
stream->read_cb = read_cb;
stream->read2_cb = read2_cb;
stream->alloc_cb = alloc_cb;
uv__io_start(stream->loop, &stream->io_watcher, UV__POLLIN);
uv__handle_start(stream);
return 0;
}
