diff options
Diffstat (limited to 'third-party/libuv/src/unix/stream.c')
| -rw-r--r-- | third-party/libuv/src/unix/stream.c | 1511 |
1 files changed, 0 insertions, 1511 deletions
diff --git a/third-party/libuv/src/unix/stream.c b/third-party/libuv/src/unix/stream.c deleted file mode 100644 index 9f5d40cf4b..0000000000 --- a/third-party/libuv/src/unix/stream.c +++ /dev/null @@ -1,1511 +0,0 @@ -/* Copyright Joyent, Inc. and other Node contributors. All rights reserved. - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to - * deal in the Software without restriction, including without limitation the - * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or - * sell copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING - * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS - * IN THE SOFTWARE. - */ - -#include "uv.h" -#include "internal.h" - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <assert.h> -#include <errno.h> - -#include <sys/types.h> -#include <sys/socket.h> -#include <sys/uio.h> -#include <sys/un.h> -#include <unistd.h> -#include <limits.h> /* IOV_MAX */ - -#if defined(__APPLE__) -# include <sys/event.h> -# include <sys/time.h> -# include <sys/select.h> - -/* Forward declaration */ -typedef struct uv__stream_select_s uv__stream_select_t; - -struct uv__stream_select_s { - uv_stream_t* stream; - uv_thread_t thread; - uv_sem_t close_sem; - uv_sem_t async_sem; - uv_async_t async; - int events; - int fake_fd; - int int_fd; - int fd; -}; -#endif /* defined(__APPLE__) */ - -static void uv__stream_connect(uv_stream_t*); -static void uv__write(uv_stream_t* stream); -static void uv__read(uv_stream_t* stream); -static void uv__stream_io(uv_loop_t* loop, uv__io_t* w, unsigned int events); -static size_t uv__write_req_size(uv_write_t* req); - - -/* Used by the accept() EMFILE party trick. */ -static int uv__open_cloexec(const char* path, int flags) { - int err; - int fd; - -#if defined(__linux__) - fd = open(path, flags | UV__O_CLOEXEC); - if (fd != -1) - return fd; - - if (errno != EINVAL) - return -errno; - - /* O_CLOEXEC not supported. */ -#endif - - fd = open(path, flags); - if (fd == -1) - return -errno; - - err = uv__cloexec(fd, 1); - if (err) { - uv__close(fd); - return err; - } - - return fd; -} - - -static size_t uv_count_bufs(const uv_buf_t bufs[], unsigned int nbufs) { - unsigned int i; - size_t bytes; - - bytes = 0; - for (i = 0; i < nbufs; i++) - bytes += bufs[i].len; - - return bytes; -} - - -void uv__stream_init(uv_loop_t* loop, - uv_stream_t* stream, - uv_handle_type type) { - int err; - - uv__handle_init(loop, (uv_handle_t*)stream, type); - stream->read_cb = NULL; - stream->read2_cb = NULL; - stream->alloc_cb = NULL; - stream->close_cb = NULL; - stream->connection_cb = NULL; - stream->connect_req = NULL; - stream->shutdown_req = NULL; - stream->accepted_fd = -1; - stream->delayed_error = 0; - QUEUE_INIT(&stream->write_queue); - QUEUE_INIT(&stream->write_completed_queue); - stream->write_queue_size = 0; - - if (loop->emfile_fd == -1) { - err = uv__open_cloexec("/", O_RDONLY); - if (err >= 0) - loop->emfile_fd = err; - } - -#if defined(__APPLE__) - stream->select = NULL; -#endif /* defined(__APPLE_) */ - - uv__io_init(&stream->io_watcher, uv__stream_io, -1); -} - - -static void uv__stream_osx_interrupt_select(uv_stream_t* stream) { -#if defined(__APPLE__) - /* Notify select() thread about state change */ - uv__stream_select_t* s; - int r; - - s = stream->select; - if (s == NULL) - return; - - /* Interrupt select() loop - * NOTE: fake_fd and int_fd are socketpair(), thus writing to one will - * emit read event on other side - */ - do - r = write(s->fake_fd, "x", 1); - while (r == -1 && errno == EINTR); - - assert(r == 1); -#else /* !defined(__APPLE__) */ - /* No-op on any other platform */ -#endif /* !defined(__APPLE__) */ -} - - -#if defined(__APPLE__) -static void uv__stream_osx_select(void* arg) { - uv_stream_t* stream; - uv__stream_select_t* s; - char buf[1024]; - fd_set sread; - fd_set swrite; - int events; - int fd; - int r; - int max_fd; - - stream = arg; - s = stream->select; - fd = s->fd; - - if (fd > s->int_fd) - max_fd = fd; - else - max_fd = s->int_fd; - - while (1) { - /* Terminate on semaphore */ - if (uv_sem_trywait(&s->close_sem) == 0) - break; - - /* Watch fd using select(2) */ - FD_ZERO(&sread); - FD_ZERO(&swrite); - - if (uv__io_active(&stream->io_watcher, UV__POLLIN)) - FD_SET(fd, &sread); - if (uv__io_active(&stream->io_watcher, UV__POLLOUT)) - FD_SET(fd, &swrite); - FD_SET(s->int_fd, &sread); - - /* Wait indefinitely for fd events */ - r = select(max_fd + 1, &sread, &swrite, NULL, NULL); - if (r == -1) { - if (errno == EINTR) - continue; - - /* XXX: Possible?! */ - abort(); - } - - /* Ignore timeouts */ - if (r == 0) - continue; - - /* Empty socketpair's buffer in case of interruption */ - if (FD_ISSET(s->int_fd, &sread)) - while (1) { - r = read(s->int_fd, buf, sizeof(buf)); - - if (r == sizeof(buf)) - continue; - - if (r != -1) - break; - - if (errno == EAGAIN || errno == EWOULDBLOCK) - break; - - if (errno == EINTR) - continue; - - abort(); - } - - /* Handle events */ - events = 0; - if (FD_ISSET(fd, &sread)) - events |= UV__POLLIN; - if (FD_ISSET(fd, &swrite)) - events |= UV__POLLOUT; - - assert(events != 0 || FD_ISSET(s->int_fd, &sread)); - if (events != 0) { - ACCESS_ONCE(int, s->events) = events; - - uv_async_send(&s->async); - uv_sem_wait(&s->async_sem); - - /* Should be processed at this stage */ - assert((s->events == 0) || (stream->flags & UV_CLOSING)); - } - } -} - - -static void uv__stream_osx_select_cb(uv_async_t* handle, int status) { - uv__stream_select_t* s; - uv_stream_t* stream; - int events; - - s = container_of(handle, uv__stream_select_t, async); - stream = s->stream; - - /* Get and reset stream's events */ - events = s->events; - ACCESS_ONCE(int, s->events) = 0; - uv_sem_post(&s->async_sem); - - assert(events != 0); - assert(events == (events & (UV__POLLIN | UV__POLLOUT))); - - /* Invoke callback on event-loop */ - if ((events & UV__POLLIN) && uv__io_active(&stream->io_watcher, UV__POLLIN)) - uv__stream_io(stream->loop, &stream->io_watcher, UV__POLLIN); - - if ((events & UV__POLLOUT) && uv__io_active(&stream->io_watcher, UV__POLLOUT)) - uv__stream_io(stream->loop, &stream->io_watcher, UV__POLLOUT); -} - - -static void uv__stream_osx_cb_close(uv_handle_t* async) { - uv__stream_select_t* s; - - s = container_of(async, uv__stream_select_t, async); - free(s); -} - - -int uv__stream_try_select(uv_stream_t* stream, int* fd) { - /* - * kqueue doesn't work with some files from /dev mount on osx. - * select(2) in separate thread for those fds - */ - - struct kevent filter[1]; - struct kevent events[1]; - struct timespec timeout; - uv__stream_select_t* s; - int fds[2]; - int err; - int ret; - int kq; - - kq = kqueue(); - if (kq == -1) { - perror("(libuv) kqueue()"); - return -errno; - } - - EV_SET(&filter[0], *fd, EVFILT_READ, EV_ADD | EV_ENABLE, 0, 0, 0); - - /* Use small timeout, because we only want to capture EINVALs */ - timeout.tv_sec = 0; - timeout.tv_nsec = 1; - - ret = kevent(kq, filter, 1, events, 1, &timeout); - uv__close(kq); - - if (ret == -1) - return -errno; - - if (ret == 0 || (events[0].flags & EV_ERROR) == 0 || events[0].data != EINVAL) - return 0; - - /* At this point we definitely know that this fd won't work with kqueue */ - s = malloc(sizeof(*s)); - if (s == NULL) - return -ENOMEM; - - s->events = 0; - s->fd = *fd; - - err = uv_async_init(stream->loop, &s->async, uv__stream_osx_select_cb); - if (err) { - free(s); - return err; - } - - s->async.flags |= UV__HANDLE_INTERNAL; - uv__handle_unref(&s->async); - - if (uv_sem_init(&s->close_sem, 0)) - goto fatal1; - - if (uv_sem_init(&s->async_sem, 0)) - goto fatal2; - - /* Create fds for io watcher and to interrupt the select() loop. */ - if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds)) - goto fatal3; - - s->fake_fd = fds[0]; - s->int_fd = fds[1]; - - if (uv_thread_create(&s->thread, uv__stream_osx_select, stream)) - goto fatal4; - - s->stream = stream; - stream->select = s; - *fd = s->fake_fd; - - return 0; - -fatal4: - uv__close(s->fake_fd); - uv__close(s->int_fd); - s->fake_fd = -1; - s->int_fd = -1; -fatal3: - uv_sem_destroy(&s->async_sem); -fatal2: - uv_sem_destroy(&s->close_sem); -fatal1: - uv_close((uv_handle_t*) &s->async, uv__stream_osx_cb_close); - return -errno; -} -#endif /* defined(__APPLE__) */ - - -int uv__stream_open(uv_stream_t* stream, int fd, int flags) { - assert(fd >= 0); - stream->flags |= flags; - - if (stream->type == UV_TCP) { - if ((stream->flags & UV_TCP_NODELAY) && uv__tcp_nodelay(fd, 1)) - return -errno; - - /* TODO Use delay the user passed in. */ - if ((stream->flags & UV_TCP_KEEPALIVE) && uv__tcp_keepalive(fd, 1, 60)) - return -errno; - } - - stream->io_watcher.fd = fd; - - return 0; -} - - -void uv__stream_destroy(uv_stream_t* stream) { - uv_write_t* req; - QUEUE* q; - - assert(!uv__io_active(&stream->io_watcher, UV__POLLIN | UV__POLLOUT)); - assert(stream->flags & UV_CLOSED); - - if (stream->connect_req) { - uv__req_unregister(stream->loop, stream->connect_req); - stream->connect_req->cb(stream->connect_req, -ECANCELED); - stream->connect_req = NULL; - } - - while (!QUEUE_EMPTY(&stream->write_queue)) { - q = QUEUE_HEAD(&stream->write_queue); - QUEUE_REMOVE(q); - - req = QUEUE_DATA(q, uv_write_t, queue); - uv__req_unregister(stream->loop, req); - - if (req->bufs != req->bufsml) - free(req->bufs); - req->bufs = NULL; - - if (req->cb != NULL) - req->cb(req, -ECANCELED); - } - - while (!QUEUE_EMPTY(&stream->write_completed_queue)) { - q = QUEUE_HEAD(&stream->write_completed_queue); - QUEUE_REMOVE(q); - - req = QUEUE_DATA(q, uv_write_t, queue); - uv__req_unregister(stream->loop, req); - - if (req->bufs != NULL) { - stream->write_queue_size -= uv__write_req_size(req); - if (req->bufs != req->bufsml) - free(req->bufs); - req->bufs = NULL; - } - - if (req->cb) - req->cb(req, req->error); - } - - if (stream->shutdown_req) { - /* The ECANCELED error code is a lie, the shutdown(2) syscall is a - * fait accompli at this point. Maybe we should revisit this in v0.11. - * A possible reason for leaving it unchanged is that it informs the - * callee that the handle has been destroyed. - */ - uv__req_unregister(stream->loop, stream->shutdown_req); - stream->shutdown_req->cb(stream->shutdown_req, -ECANCELED); - stream->shutdown_req = NULL; - } -} - - -/* Implements a best effort approach to mitigating accept() EMFILE errors. - * We have a spare file descriptor stashed away that we close to get below - * the EMFILE limit. Next, we accept all pending connections and close them - * immediately to signal the clients that we're overloaded - and we are, but - * we still keep on trucking. - * - * There is one caveat: it's not reliable in a multi-threaded environment. - * The file descriptor limit is per process. Our party trick fails if another - * thread opens a file or creates a socket in the time window between us - * calling close() and accept(). - */ -static int uv__emfile_trick(uv_loop_t* loop, int accept_fd) { - int err; - - if (loop->emfile_fd == -1) - return -EMFILE; - - uv__close(loop->emfile_fd); - loop->emfile_fd = -1; - - do { - err = uv__accept(accept_fd); - if (err >= 0) - uv__close(err); - } while (err >= 0 || err == -EINTR); - - SAVE_ERRNO(loop->emfile_fd = uv__open_cloexec("/", O_RDONLY)); - return err; -} - - -#if defined(UV_HAVE_KQUEUE) -# define UV_DEC_BACKLOG(w) w->rcount--; -#else -# define UV_DEC_BACKLOG(w) /* no-op */ -#endif /* defined(UV_HAVE_KQUEUE) */ - - -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); - -#if defined(UV_HAVE_KQUEUE) - if (w->rcount <= 0) - return; -#endif /* defined(UV_HAVE_KQUEUE) */ - - 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. */ - - if (err == -EMFILE || err == -ENFILE) { - err = uv__emfile_trick(loop, uv__stream_fd(stream)); - if (err == -EAGAIN || err == -EWOULDBLOCK) - break; - } - - stream->connection_cb(stream, err); - continue; - } - - UV_DEC_BACKLOG(w) - 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; - } - - if (stream->type == UV_TCP && (stream->flags & UV_TCP_SINGLE_ACCEPT)) { - /* Give other processes a chance to accept connections. */ - struct timespec timeout = { 0, 1 }; - nanosleep(&timeout, NULL); - } - } -} - - -#undef UV_DEC_BACKLOG - - -int uv_accept(uv_stream_t* server, uv_stream_t* client) { - int err; - - /* TODO document this */ - assert(server->loop == client->loop); - - if (server->accepted_fd == -1) - return -EAGAIN; - - switch (client->type) { - case UV_NAMED_PIPE: - case UV_TCP: - err = uv__stream_open(client, - server->accepted_fd, - UV_STREAM_READABLE | UV_STREAM_WRITABLE); - if (err) { - /* TODO handle error */ - uv__close(server->accepted_fd); - server->accepted_fd = -1; - return err; - } - break; - - case UV_UDP: - err = uv_udp_open((uv_udp_t*) client, server->accepted_fd); - if (err) { - uv__close(server->accepted_fd); - server->accepted_fd = -1; - return err; - } - break; - - default: - assert(0); - } - - uv__io_start(server->loop, &server->io_watcher, UV__POLLIN); - server->accepted_fd = -1; - return 0; -} - - -int uv_listen(uv_stream_t* stream, int backlog, uv_connection_cb cb) { - int err; - - err = -EINVAL; - switch (stream->type) { - case UV_TCP: - err = uv_tcp_listen((uv_tcp_t*)stream, backlog, cb); - break; - - case UV_NAMED_PIPE: - err = uv_pipe_listen((uv_pipe_t*)stream, backlog, cb); - break; - - default: - assert(0); - } - - if (err == 0) - uv__handle_start(stream); - - return err; -} - - -static void uv__drain(uv_stream_t* stream) { - uv_shutdown_t* req; - int err; - - assert(QUEUE_EMPTY(&stream->write_queue)); - uv__io_stop(stream->loop, &stream->io_watcher, UV__POLLOUT); - uv__stream_osx_interrupt_select(stream); - - /* 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; - stream->flags &= ~UV_STREAM_SHUTTING; - uv__req_unregister(stream->loop, req); - - err = 0; - if (shutdown(uv__stream_fd(stream), SHUT_WR)) - err = -errno; - - if (err == 0) - stream->flags |= UV_STREAM_SHUT; - - if (req->cb != NULL) - req->cb(req, err); - } -} - - -static size_t uv__write_req_size(uv_write_t* req) { - size_t size; - - assert(req->bufs != NULL); - size = uv_count_bufs(req->bufs + req->write_index, - req->nbufs - req->write_index); - assert(req->handle->write_queue_size >= size); - - return size; -} - - -static void uv__write_req_finish(uv_write_t* req) { - uv_stream_t* stream = req->handle; - - /* Pop the req off tcp->write_queue. */ - QUEUE_REMOVE(&req->queue); - - /* Only free when there was no error. On error, we touch up write_queue_size - * right before making the callback. The reason we don't do that right away - * is that a write_queue_size > 0 is our only way to signal to the user that - * they should stop writing - which they should if we got an error. Something - * to revisit in future revisions of the libuv API. - */ - if (req->error == 0) { - if (req->bufs != req->bufsml) - free(req->bufs); - req->bufs = NULL; - } - - /* Add it to the write_completed_queue where it will have its - * callback called in the near future. - */ - QUEUE_INSERT_TAIL(&stream->write_completed_queue, &req->queue); - uv__io_feed(stream->loop, &stream->io_watcher); -} - - -static int uv__handle_fd(uv_handle_t* handle) { - switch (handle->type) { - case UV_NAMED_PIPE: - case UV_TCP: - return ((uv_stream_t*) handle)->io_watcher.fd; - - case UV_UDP: - return ((uv_udp_t*) handle)->io_watcher.fd; - - default: - return -1; - } -} - -static int uv__getiovmax() { -#if defined(IOV_MAX) - return IOV_MAX; -#elif defined(_SC_IOV_MAX) - static int iovmax = -1; - if (iovmax == -1) - iovmax = sysconf(_SC_IOV_MAX); - return iovmax; -#else - return 1024; -#endif -} - -static void uv__write(uv_stream_t* stream) { - struct iovec* iov; - QUEUE* q; - uv_write_t* req; - int iovmax; - int iovcnt; - ssize_t n; - -start: - - assert(uv__stream_fd(stream) >= 0); - - if (QUEUE_EMPTY(&stream->write_queue)) - return; - - q = QUEUE_HEAD(&stream->write_queue); - req = QUEUE_DATA(q, uv_write_t, queue); - assert(req->handle == stream); - - /* - * Cast to iovec. We had to have our own uv_buf_t instead of iovec - * because Windows's WSABUF is not an iovec. - */ - assert(sizeof(uv_buf_t) == sizeof(struct iovec)); - iov = (struct iovec*) &(req->bufs[req->write_index]); - iovcnt = req->nbufs - req->write_index; - - iovmax = uv__getiovmax(); - - /* Limit iov count to avoid EINVALs from writev() */ - if (iovcnt > iovmax) - iovcnt = iovmax; - - /* - * Now do the actual writev. Note that we've been updating the pointers - * inside the iov each time we write. So there is no need to offset it. - */ - - if (req->send_handle) { - struct msghdr msg; - char scratch[64]; - struct cmsghdr *cmsg; - int fd_to_send = uv__handle_fd((uv_handle_t*) req->send_handle); - - assert(fd_to_send >= 0); - - msg.msg_name = NULL; - msg.msg_namelen = 0; - msg.msg_iov = iov; - msg.msg_iovlen = iovcnt; - msg.msg_flags = 0; - - msg.msg_control = (void*) scratch; - msg.msg_controllen = CMSG_LEN(sizeof(fd_to_send)); - - cmsg = CMSG_FIRSTHDR(&msg); - cmsg->cmsg_level = SOL_SOCKET; - cmsg->cmsg_type = SCM_RIGHTS; - cmsg->cmsg_len = msg.msg_controllen; - - /* silence aliasing warning */ - { - void* pv = CMSG_DATA(cmsg); - int* pi = pv; - *pi = fd_to_send; - } - - do { - n = sendmsg(uv__stream_fd(stream), &msg, 0); - } - while (n == -1 && errno == EINTR); - } else { - do { - if (iovcnt == 1) { - n = write(uv__stream_fd(stream), iov[0].iov_base, iov[0].iov_len); - } else { - n = writev(uv__stream_fd(stream), iov, iovcnt); - } - } - while (n == -1 && errno == EINTR); - } - - if (n < 0) { - if (errno != EAGAIN && errno != EWOULDBLOCK) { - /* Error */ - req->error = -errno; - uv__write_req_finish(req); - uv__io_stop(stream->loop, &stream->io_watcher, UV__POLLOUT); - if (!uv__io_active(&stream->io_watcher, UV__POLLIN)) - uv__handle_stop(stream); - uv__stream_osx_interrupt_select(stream); - return; - } else if (stream->flags & UV_STREAM_BLOCKING) { - /* If this is a blocking stream, try again. */ - goto start; - } - } else { - /* Successful write */ - - while (n >= 0) { - uv_buf_t* buf = &(req->bufs[req->write_index]); - size_t len = buf->len; - - assert(req->write_index < req->nbufs); - - if ((size_t)n < len) { - buf->base += n; - buf->len -= n; - stream->write_queue_size -= n; - n = 0; - - /* There is more to write. */ - if (stream->flags & UV_STREAM_BLOCKING) { - /* - * If we're blocking then we should not be enabling the write - * watcher - instead we need to try again. - */ - goto start; - } else { - /* Break loop and ensure the watcher is pending. */ - break; - } - - } else { - /* Finished writing the buf at index req->write_index. */ - req->write_index++; - - assert((size_t)n >= len); - n -= len; - - assert(stream->write_queue_size >= len); - stream->write_queue_size -= len; - - if (req->write_index == req->nbufs) { - /* Then we're done! */ - assert(n == 0); - uv__write_req_finish(req); - /* TODO: start trying to write the next request. */ - return; - } - } - } - } - - /* Either we've counted n down to zero or we've got EAGAIN. */ - assert(n == 0 || n == -1); - - /* Only non-blocking streams should use the write_watcher. */ - assert(!(stream->flags & UV_STREAM_BLOCKING)); - - /* We're not done. */ - uv__io_start(stream->loop, &stream->io_watcher, UV__POLLOUT); - - /* Notify select() thread about state change */ - uv__stream_osx_interrupt_select(stream); -} - - -static void uv__write_callbacks(uv_stream_t* stream) { - uv_write_t* req; - QUEUE* q; - - while (!QUEUE_EMPTY(&stream->write_completed_queue)) { - /* Pop a req off write_completed_queue. */ - q = QUEUE_HEAD(&stream->write_completed_queue); - req = QUEUE_DATA(q, uv_write_t, queue); - QUEUE_REMOVE(q); - uv__req_unregister(stream->loop, req); - - if (req->bufs != NULL) { - stream->write_queue_size -= uv__write_req_size(req); - if (req->bufs != req->bufsml) - free(req->bufs); - req->bufs = NULL; - } - - /* NOTE: call callback AFTER freeing the request data. */ - if (req->cb) - req->cb(req, req->error); - } - - assert(QUEUE_EMPTY(&stream->write_completed_queue)); - - /* Write queue drained. */ - if (QUEUE_EMPTY(&stream->write_queue)) - uv__drain(stream); -} - - -static uv_handle_type uv__handle_type(int fd) { - struct sockaddr_storage ss; - socklen_t len; - int type; - - memset(&ss, 0, sizeof(ss)); - len = sizeof(ss); - - if (getsockname(fd, (struct sockaddr*)&ss, &len)) - return UV_UNKNOWN_HANDLE; - - len = sizeof type; - - if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &len)) - return UV_UNKNOWN_HANDLE; - - if (type == SOCK_STREAM) { - switch (ss.ss_family) { - case AF_UNIX: - return UV_NAMED_PIPE; - case AF_INET: - case AF_INET6: - return UV_TCP; - } - } - - if (type == SOCK_DGRAM && - (ss.ss_family == AF_INET || ss.ss_family == AF_INET6)) - return UV_UDP; - - return UV_UNKNOWN_HANDLE; -} - - -static void uv__stream_read_cb(uv_stream_t* stream, - int status, - const uv_buf_t* buf, - uv_handle_type type) { - if (stream->read_cb != NULL) - stream->read_cb(stream, status, buf); - else - stream->read2_cb((uv_pipe_t*) stream, status, buf, type); -} - - -static void uv__stream_eof(uv_stream_t* stream, const uv_buf_t* buf) { - stream->flags |= UV_STREAM_READ_EOF; - uv__io_stop(stream->loop, &stream->io_watcher, UV__POLLIN); - if (!uv__io_active(&stream->io_watcher, UV__POLLOUT)) - uv__handle_stop(stream); - uv__stream_osx_interrupt_select(stream); - uv__stream_read_cb(stream, UV_EOF, buf, UV_UNKNOWN_HANDLE); -} - - -static void uv__read(uv_stream_t* stream) { - uv_buf_t buf; - ssize_t nread; - struct msghdr msg; - struct cmsghdr* cmsg; - char cmsg_space[64]; - int count; - - stream->flags &= ~UV_STREAM_READ_PARTIAL; - - /* Prevent loop starvation when the data comes in as fast as (or faster than) - * we can read it. XXX Need to rearm fd if we switch to edge-triggered I/O. - */ - count = 32; - - /* XXX: Maybe instead of having UV_STREAM_READING we just test if - * tcp->read_cb is NULL or not? - */ - while ((stream->read_cb || stream->read2_cb) - && (stream->flags & UV_STREAM_READING) - && (count-- > 0)) { - assert(stream->alloc_cb != NULL); - - stream->alloc_cb((uv_handle_t*)stream, 64 * 1024, &buf); - if (buf.len == 0) { - /* User indicates it can't or won't handle the read. */ - uv__stream_read_cb(stream, UV_ENOBUFS, &buf, UV_UNKNOWN_HANDLE); - return; - } - - assert(buf.base != NULL); - assert(uv__stream_fd(stream) >= 0); - - if (stream->read_cb) { - do { - nread = read(uv__stream_fd(stream), buf.base, buf.len); - } - while (nread < 0 && errno == EINTR); - } else { - assert(stream->read2_cb); - /* read2_cb uses recvmsg */ - msg.msg_flags = 0; - msg.msg_iov = (struct iovec*) &buf; - msg.msg_iovlen = 1; - msg.msg_name = NULL; - msg.msg_namelen = 0; - /* Set up to receive a descriptor even if one isn't in the message */ - msg.msg_controllen = 64; - msg.msg_control = (void*) cmsg_space; - - do { - nread = uv__recvmsg(uv__stream_fd(stream), &msg, 0); - } - while (nread < 0 && errno == EINTR); - } - - if (nread < 0) { - /* Error */ - if (errno == EAGAIN || errno == EWOULDBLOCK) { - /* Wait for the next one. */ - if (stream->flags & UV_STREAM_READING) { - uv__io_start(stream->loop, &stream->io_watcher, UV__POLLIN); - uv__stream_osx_interrupt_select(stream); - } - uv__stream_read_cb(stream, 0, &buf, UV_UNKNOWN_HANDLE); - } else { - /* Error. User should call uv_close(). */ - uv__stream_read_cb(stream, -errno, &buf, UV_UNKNOWN_HANDLE); - assert(!uv__io_active(&stream->io_watcher, UV__POLLIN) && - "stream->read_cb(status=-1) did not call uv_close()"); - } - return; - } else if (nread == 0) { - uv__stream_eof(stream, &buf); - return; - } else { - /* Successful read */ - ssize_t buflen = buf.len; - - if (stream->read_cb) { - stream->read_cb(stream, nread, &buf); - } else { - assert(stream->read2_cb); - - /* - * XXX: Some implementations can send multiple file descriptors in a - * single message. We should be using CMSG_NXTHDR() to walk the - * chain to get at them all. This would require changing the API to - * hand these back up the caller, is a pain. - */ - - for (cmsg = CMSG_FIRSTHDR(&msg); - msg.msg_controllen > 0 && cmsg != NULL; - cmsg = CMSG_NXTHDR(&msg, cmsg)) { - - if (cmsg->cmsg_type == SCM_RIGHTS) { - if (stream->accepted_fd != -1) { - fprintf(stderr, "(libuv) ignoring extra FD received\n"); - } - - /* silence aliasing warning */ - { - void* pv = CMSG_DATA(cmsg); - int* pi = pv; - stream->accepted_fd = *pi; - } - - } else { - fprintf(stderr, "ignoring non-SCM_RIGHTS ancillary data: %d\n", - cmsg->cmsg_type); - } - } - - - if (stream->accepted_fd >= 0) { - stream->read2_cb((uv_pipe_t*) stream, - nread, - &buf, - uv__handle_type(stream->accepted_fd)); - } else { - stream->read2_cb((uv_pipe_t*) stream, nread, &buf, UV_UNKNOWN_HANDLE); - } - } - - /* Return if we didn't fill the buffer, there is no more data to read. */ - if (nread < buflen) { - stream->flags |= UV_STREAM_READ_PARTIAL; - return; - } - } - } -} - - -int uv_shutdown(uv_shutdown_t* req, uv_stream_t* stream, uv_shutdown_cb cb) { - assert((stream->type == UV_TCP || stream->type == UV_NAMED_PIPE) && - "uv_shutdown (unix) only supports uv_handle_t right now"); - - if (!(stream->flags & UV_STREAM_WRITABLE) || - stream->flags & UV_STREAM_SHUT || - stream->flags & UV_CLOSED || - stream->flags & UV_CLOSING) { - return -ENOTCONN; - } - - assert(uv__stream_fd(stream) >= 0); - - /* Initialize request */ - uv__req_init(stream->loop, req, UV_SHUTDOWN); - req->handle = stream; - req->cb = cb; - stream->shutdown_req = req; - stream->flags |= UV_STREAM_SHUTTING; - - uv__io_start(stream->loop, &stream->io_watcher, UV__POLLOUT); - uv__stream_osx_interrupt_select(stream); - - return 0; -} - - -static void uv__stream_io(uv_loop_t* loop, uv__io_t* w, unsigned int events) { - uv_stream_t* stream; - - stream = container_of(w, uv_stream_t, io_watcher); - - assert(stream->type == UV_TCP || - stream->type == UV_NAMED_PIPE || - stream->type == UV_TTY); - assert(!(stream->flags & UV_CLOSING)); - - if (stream->connect_req) { - uv__stream_connect(stream); - return; - } - - assert(uv__stream_fd(stream) >= 0); - - /* Ignore POLLHUP here. Even it it's set, there may still be data to read. */ - if (events & (UV__POLLIN | UV__POLLERR)) - uv__read(stream); - - if (uv__stream_fd(stream) == -1) - return; /* read_cb closed stream. */ - - /* Short-circuit iff POLLHUP is set, the user is still interested in read - * events and uv__read() reported a partial read but not EOF. If the EOF - * flag is set, uv__read() called read_cb with err=UV_EOF and we don't - * have to do anything. If the partial read flag is not set, we can't - * report the EOF yet because there is still data to read. - */ - if ((events & UV__POLLHUP) && - (stream->flags & UV_STREAM_READING) && - (stream->flags & UV_STREAM_READ_PARTIAL) && - !(stream->flags & UV_STREAM_READ_EOF)) { - uv_buf_t buf = { NULL, 0 }; - uv__stream_eof(stream, &buf); - } - - if (uv__stream_fd(stream) == -1) - return; /* read_cb closed stream. */ - - if (events & (UV__POLLOUT | UV__POLLERR | UV__POLLHUP)) { - uv__write(stream); - uv__write_callbacks(stream); - } -} - - -/** - * 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); - error = -error; - } - - if (error == -EINPROGRESS) - return; - - stream->connect_req = NULL; - uv__req_unregister(stream->loop, req); - uv__io_stop(stream->loop, &stream->io_watcher, UV__POLLOUT); - - if (req->cb) - req->cb(req, error); -} - - -int uv_write2(uv_write_t* req, - uv_stream_t* stream, - const uv_buf_t bufs[], - unsigned int nbufs, - uv_stream_t* send_handle, - uv_write_cb cb) { - int empty_queue; - - assert(nbufs > 0); - assert((stream->type == UV_TCP || - stream->type == UV_NAMED_PIPE || - stream->type == UV_TTY) && - "uv_write (unix) does not yet support other types of streams"); - - if (uv__stream_fd(stream) < 0) - return -EBADF; - - if (send_handle) { - if (stream->type != UV_NAMED_PIPE || !((uv_pipe_t*)stream)->ipc) - return -EINVAL; - - /* XXX We abuse uv_write2() to send over UDP handles to child processes. - * Don't call uv__stream_fd() on those handles, it's a macro that on OS X - * evaluates to a function that operates on a uv_stream_t with a couple of - * OS X specific fields. On other Unices it does (handle)->io_watcher.fd, - * which works but only by accident. - */ - if (uv__handle_fd((uv_handle_t*) send_handle) < 0) - return -EBADF; - } - - /* It's legal for write_queue_size > 0 even when the write_queue is empty; - * it means there are error-state requests in the write_completed_queue that - * will touch up write_queue_size later, see also uv__write_req_finish(). - * We chould check that write_queue is empty instead but that implies making - * a write() syscall when we know that the handle is in error mode. - */ - empty_queue = (stream->write_queue_size == 0); - - /* Initialize the req */ - uv__req_init(stream->loop, req, UV_WRITE); - req->cb = cb; - req->handle = stream; - req->error = 0; - req->send_handle = send_handle; - QUEUE_INIT(&req->queue); - - req->bufs = req->bufsml; - if (nbufs > ARRAY_SIZE(req->bufsml)) - req->bufs = malloc(nbufs * sizeof(bufs[0])); - - if (req->bufs == NULL) - return -ENOMEM; - - memcpy(req->bufs, bufs, nbufs * sizeof(bufs[0])); - req->nbufs = nbufs; - req->write_index = 0; - stream->write_queue_size += uv_count_bufs(bufs, nbufs); - - /* Append the request to write_queue. */ - QUEUE_INSERT_TAIL(&stream->write_queue, &req->queue); - - /* If the queue was empty when this function began, we should attempt to - * do the write immediately. Otherwise start the write_watcher and wait - * for the fd to become writable. - */ - if (stream->connect_req) { - /* Still connecting, do nothing. */ - } - else if (empty_queue) { - uv__write(stream); - } - else { - /* - * blocking streams should never have anything in the queue. - * if this assert fires then somehow the blocking stream isn't being - * sufficiently flushed in uv__write. - */ - assert(!(stream->flags & UV_STREAM_BLOCKING)); - uv__io_start(stream->loop, &stream->io_watcher, UV__POLLOUT); - uv__stream_osx_interrupt_select(stream); - } - - return 0; -} - - -/* The buffers to be written must remain valid until the callback is called. - * This is not required for the uv_buf_t array. - */ -int uv_write(uv_write_t* req, - uv_stream_t* handle, - const uv_buf_t bufs[], - unsigned int nbufs, - uv_write_cb cb) { - return uv_write2(req, handle, bufs, nbufs, NULL, cb); -} - - -void uv_try_write_cb(uv_write_t* req, int status) { - /* Should not be called */ - abort(); -} - - -int uv_try_write(uv_stream_t* stream, - const uv_buf_t bufs[], - unsigned int nbufs) { - int r; - int has_pollout; - size_t written; - size_t req_size; - uv_write_t req; - - /* Connecting or already writing some data */ - if (stream->connect_req != NULL || stream->write_queue_size != 0) - return 0; - - has_pollout = uv__io_active(&stream->io_watcher, UV__POLLOUT); - - r = uv_write(&req, stream, bufs, nbufs, uv_try_write_cb); - if (r != 0) - return r; - - /* Remove not written bytes from write queue size */ - written = uv_count_bufs(bufs, nbufs); - if (req.bufs != NULL) - req_size = uv__write_req_size(&req); - else - req_size = 0; - written -= req_size; - stream->write_queue_size -= req_size; - - /* Unqueue request, regardless of immediateness */ - QUEUE_REMOVE(&req.queue); - uv__req_unregister(stream->loop, &req); - if (req.bufs != req.bufsml) - free(req.bufs); - req.bufs = NULL; - - /* Do not poll for writable, if we wasn't before calling this */ - if (!has_pollout) { - uv__io_stop(stream->loop, &stream->io_watcher, UV__POLLOUT); - uv__stream_osx_interrupt_select(stream); - } - - return (int) written; -} - - -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) - return -EINVAL; - - /* 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; - - /* 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); - uv__stream_osx_interrupt_select(stream); - - return 0; -} - - -int uv_read_start(uv_stream_t* stream, uv_alloc_cb alloc_cb, - uv_read_cb read_cb) { - return uv__read_start_common(stream, alloc_cb, read_cb, NULL); -} - - -int uv_read2_start(uv_stream_t* stream, uv_alloc_cb alloc_cb, - uv_read2_cb read_cb) { - return uv__read_start_common(stream, alloc_cb, NULL, read_cb); -} - - -int uv_read_stop(uv_stream_t* stream) { - /* Sanity check. We're going to stop the handle unless it's primed for - * writing but that means there should be some kind of write action in - * progress. - */ - assert(!uv__io_active(&stream->io_watcher, UV__POLLOUT) || - !QUEUE_EMPTY(&stream->write_completed_queue) || - !QUEUE_EMPTY(&stream->write_queue) || - stream->shutdown_req != NULL || - stream->connect_req != NULL); - - stream->flags &= ~UV_STREAM_READING; - uv__io_stop(stream->loop, &stream->io_watcher, UV__POLLIN); - if (!uv__io_active(&stream->io_watcher, UV__POLLOUT)) - uv__handle_stop(stream); - uv__stream_osx_interrupt_select(stream); - - stream->read_cb = NULL; - stream->read2_cb = NULL; - stream->alloc_cb = NULL; - return 0; -} - - -int uv_is_readable(const uv_stream_t* stream) { - return !!(stream->flags & UV_STREAM_READABLE); -} - - -int uv_is_writable(const uv_stream_t* stream) { - return !!(stream->flags & UV_STREAM_WRITABLE); -} - - -#if defined(__APPLE__) -int uv___stream_fd(uv_stream_t* handle) { - uv__stream_select_t* s; - - assert(handle->type == UV_TCP || - handle->type == UV_TTY || - handle->type == UV_NAMED_PIPE); - - s = handle->select; - if (s != NULL) - return s->fd; - - return handle->io_watcher.fd; -} -#endif /* defined(__APPLE__) */ - - -void uv__stream_close(uv_stream_t* handle) { -#if defined(__APPLE__) - /* Terminate select loop first */ - if (handle->select != NULL) { - uv__stream_select_t* s; - - s = handle->select; - - uv_sem_post(&s->close_sem); - uv_sem_post(&s->async_sem); - uv__stream_osx_interrupt_select(handle); - uv_thread_join(&s->thread); - uv_sem_destroy(&s->close_sem); - uv_sem_destroy(&s->async_sem); - uv__close(s->fake_fd); - uv__close(s->int_fd); - uv_close((uv_handle_t*) &s->async, uv__stream_osx_cb_close); - - handle->select = NULL; - } -#endif /* defined(__APPLE__) */ - - uv__io_close(handle->loop, &handle->io_watcher); - uv_read_stop(handle); - uv__handle_stop(handle); - - if (handle->io_watcher.fd != -1) { - /* Don't close stdio file descriptors. Nothing good comes from it. */ - if (handle->io_watcher.fd > STDERR_FILENO) - uv__close(handle->io_watcher.fd); - handle->io_watcher.fd = -1; - } - - if (handle->accepted_fd != -1) { - uv__close(handle->accepted_fd); - handle->accepted_fd = -1; - } - - assert(!uv__io_active(&handle->io_watcher, UV__POLLIN | UV__POLLOUT)); -} - - -int uv_stream_set_blocking(uv_stream_t* handle, int blocking) { - assert(0 && "implement me"); - abort(); - return 0; -} |