text: /* 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.
   */
  
  #ifndef UV_UNIX_INTERNAL_H_
  #define UV_UNIX_INTERNAL_H_
  
  #include "uv-common.h"
  
  #include <assert.h>
  #include <stdlib.h> /* abort */
  
  #if defined(__STRICT_ANSI__)
  # define inline __inline
  #endif
  
  #if defined(__linux__)
  # include "linux-syscalls.h"
  #endif /* __linux__ */
  
  #if defined(__sun)
  # include <sys/port.h>
  # include <port.h>
  # define futimes(fd, tv) futimesat(fd, (void*)0, tv)
  #endif /* __sun */
  
  #if defined(__APPLE__) && !TARGET_OS_IPHONE
  # include <CoreServices/CoreServices.h>
  #endif
  
  #define STATIC_ASSERT(expr)                                                   \
    void uv__static_assert(int static_assert_failed[0 - !(expr)])
  
  #define ACCESS_ONCE(type, var)                                                \
    (*(volatile type*) &(var))
  
  #define UNREACHABLE()                                                         \
    do {                                                                        \
      assert(0 && "unreachable code");                                          \
      abort();                                                                  \
    }                                                                           \
    while (0)
  
  #define SAVE_ERRNO(block)                                                     \
    do {                                                                        \
      int _saved_errno = errno;                                                 \
      do { block; } while (0);                                                  \
      errno = _saved_errno;                                                     \
    }                                                                           \
    while (0)
  
  #if defined(__linux__)
  # define UV__POLLIN   UV__EPOLLIN
  # define UV__POLLOUT  UV__EPOLLOUT
  # define UV__POLLERR  UV__EPOLLERR
  # define UV__POLLHUP  UV__EPOLLHUP
  #endif
  
  #if defined(__sun)
  # define UV__POLLIN   POLLIN
  # define UV__POLLOUT  POLLOUT
  # define UV__POLLERR  POLLERR
  # define UV__POLLHUP  POLLHUP
  #endif
  
  #ifndef UV__POLLIN
  # define UV__POLLIN   1
  #endif
  
  #ifndef UV__POLLOUT
  # define UV__POLLOUT  2
  #endif
  
  #ifndef UV__POLLERR
  # define UV__POLLERR  4
  #endif
  
  #ifndef UV__POLLHUP
  # define UV__POLLHUP  8
  #endif
  
  /* handle flags */
  enum {
    UV_CLOSING          = 0x01,   /* uv_close() called but not finished. */
    UV_CLOSED           = 0x02,   /* close(2) finished. */
    UV_STREAM_READING   = 0x04,   /* uv_read_start() called. */
    UV_STREAM_SHUTTING  = 0x08,   /* uv_shutdown() called but not complete. */
    UV_STREAM_SHUT      = 0x10,   /* Write side closed. */
    UV_STREAM_READABLE  = 0x20,   /* The stream is readable */
    UV_STREAM_WRITABLE  = 0x40,   /* The stream is writable */
    UV_STREAM_BLOCKING  = 0x80,   /* Synchronous writes. */
    UV_TCP_NODELAY      = 0x100,  /* Disable Nagle. */
    UV_TCP_KEEPALIVE    = 0x200,  /* Turn on keep-alive. */
    UV_TCP_SINGLE_ACCEPT = 0x400  /* Only accept() when idle. */
  };
  
  /* core */
  int uv__nonblock(int fd, int set);
  int uv__cloexec(int fd, int set);
  int uv__socket(int domain, int type, int protocol);
  int uv__dup(int fd);
  void uv__make_close_pending(uv_handle_t* handle);
  
  void uv__io_init(uv__io_t* w, uv__io_cb cb, int fd);
  void uv__io_start(uv_loop_t* loop, uv__io_t* w, unsigned int events);
  void uv__io_stop(uv_loop_t* loop, uv__io_t* w, unsigned int events);
  void uv__io_close(uv_loop_t* loop, uv__io_t* w);
  void uv__io_feed(uv_loop_t* loop, uv__io_t* w);
  int uv__io_active(const uv__io_t* w, unsigned int events);
  void uv__io_poll(uv_loop_t* loop, int timeout); /* in milliseconds or -1 */
  
  /* async */
  void uv__async_send(struct uv__async* wa);
  void uv__async_init(struct uv__async* wa);
  int uv__async_start(uv_loop_t* loop, struct uv__async* wa, uv__async_cb cb);
  void uv__async_stop(uv_loop_t* loop, struct uv__async* wa);
  
  /* loop */
  int uv__loop_init(uv_loop_t* loop, int default_loop);
  void uv__loop_delete(uv_loop_t* loop);
  void uv__run_idle(uv_loop_t* loop);
  void uv__run_check(uv_loop_t* loop);
  void uv__run_prepare(uv_loop_t* loop);
  
  /* error */
  uv_err_code uv_translate_sys_error(int sys_errno);
  void uv_fatal_error(const int errorno, const char* syscall);
  
  /* stream */
  void uv__stream_init(uv_loop_t* loop, uv_stream_t* stream,
      uv_handle_type type);
  int uv__stream_open(uv_stream_t*, int fd, int flags);
  void uv__stream_destroy(uv_stream_t* stream);
  void uv__server_io(uv_loop_t* loop, uv__io_t* w, unsigned int events);
  int uv__accept(int sockfd);
  
  /* tcp */
  int uv_tcp_listen(uv_tcp_t* tcp, int backlog, uv_connection_cb cb);
  int uv__tcp_nodelay(int fd, int on);
  int uv__tcp_keepalive(int fd, int on, unsigned int delay);
  
  /* pipe */
  int uv_pipe_listen(uv_pipe_t* handle, int backlog, uv_connection_cb cb);
  
  /* timer */
  void uv__run_timers(uv_loop_t* loop);
  int uv__next_timeout(const uv_loop_t* loop);
  
  /* signal */
  void uv__signal_close(uv_signal_t* handle);
  void uv__signal_global_once_init(void);
  void uv__signal_loop_cleanup(uv_loop_t* loop);
  
  /* thread pool */
  void uv__work_submit(uv_loop_t* loop,
                       struct uv__work *w,
                       void (*work)(struct uv__work *w),
                       void (*done)(struct uv__work *w, int status));
  void uv__work_done(uv_async_t* handle, int status);
  
  /* platform specific */
  uint64_t uv__hrtime(void);
  int uv__kqueue_init(uv_loop_t* loop);
  int uv__platform_loop_init(uv_loop_t* loop, int default_loop);
  void uv__platform_loop_delete(uv_loop_t* loop);
  
  /* various */
  void uv__async_close(uv_async_t* handle);
  void uv__check_close(uv_check_t* handle);
  void uv__fs_event_close(uv_fs_event_t* handle);
  void uv__idle_close(uv_idle_t* handle);
  void uv__pipe_close(uv_pipe_t* handle);
  void uv__poll_close(uv_poll_t* handle);
  void uv__prepare_close(uv_prepare_t* handle);
  void uv__process_close(uv_process_t* handle);
  void uv__stream_close(uv_stream_t* handle);
  void uv__tcp_close(uv_tcp_t* handle);
  void uv__timer_close(uv_timer_t* handle);
  void uv__udp_close(uv_udp_t* handle);
  void uv__udp_finish_close(uv_udp_t* handle);
  
  #if defined(__APPLE__)
  int uv___stream_fd(uv_stream_t* handle);
  #define uv__stream_fd(handle) (uv___stream_fd((uv_stream_t*) (handle)))
  #else
  #define uv__stream_fd(handle) ((handle)->io_watcher.fd)
  #endif /* defined(__APPLE__) */
  
  #ifdef UV__O_NONBLOCK
  # define UV__F_NONBLOCK UV__O_NONBLOCK
  #else
  # define UV__F_NONBLOCK 1
  #endif
  
  int uv__make_socketpair(int fds[2], int flags);
  int uv__make_pipe(int fds[2], int flags);
  
  #if defined(__APPLE__)
  typedef void (*cf_loop_signal_cb)(void*);
  
  void uv__cf_loop_signal(uv_loop_t* loop, cf_loop_signal_cb cb, void* arg);
  
  int uv__fsevents_init(uv_fs_event_t* handle);
  int uv__fsevents_close(uv_fs_event_t* handle);
  
  /* OSX < 10.7 has no file events, polyfill them */
  #ifndef MAC_OS_X_VERSION_10_7
  
  static const int kFSEventStreamCreateFlagFileEvents = 0x00000010;
  static const int kFSEventStreamEventFlagItemCreated = 0x00000100;
  static const int kFSEventStreamEventFlagItemRemoved = 0x00000200;
  static const int kFSEventStreamEventFlagItemInodeMetaMod = 0x00000400;
  static const int kFSEventStreamEventFlagItemRenamed = 0x00000800;
  static const int kFSEventStreamEventFlagItemModified = 0x00001000;
  static const int kFSEventStreamEventFlagItemFinderInfoMod = 0x00002000;
  static const int kFSEventStreamEventFlagItemChangeOwner = 0x00004000;
  static const int kFSEventStreamEventFlagItemXattrMod = 0x00008000;
  static const int kFSEventStreamEventFlagItemIsFile = 0x00010000;
  static const int kFSEventStreamEventFlagItemIsDir = 0x00020000;
  static const int kFSEventStreamEventFlagItemIsSymlink = 0x00040000;
  
  #endif /* __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1070 */
  
  #endif /* defined(__APPLE__) */
  
  __attribute__((unused))
  static void uv__req_init(uv_loop_t* loop, uv_req_t* req, uv_req_type type) {
    req->type = type;
    uv__req_register(loop, req);
  }
  #define uv__req_init(loop, req, type) \
    uv__req_init((loop), (uv_req_t*)(req), (type))
  
  __attribute__((unused))
  static void uv__update_time(uv_loop_t* loop) {
    loop->time = uv__hrtime() / 1000000;
  }
  
  #endif /* UV_UNIX_INTERNAL_H_ */
  