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 */
  #include <string.h> /* strrchr */
  #include <fcntl.h>  /* O_CLOEXEC, may be */
  #include <stdio.h>
  
  #if defined(__STRICT_ANSI__)
  # define inline __inline
  #endif
  
  #if defined(__linux__)
  # include "linux-syscalls.h"
  #endif /* __linux__ */
  
  #if defined(__MVS__)
  # include "os390-syscalls.h"
  #endif /* __MVS__ */
  
  #if defined(__sun)
  # include <sys/port.h>
  # include <port.h>
  #endif /* __sun */
  
  #if defined(_AIX)
  # define reqevents events
  # define rtnevents revents
  # include <sys/poll.h>
  #else
  # include <poll.h>
  #endif /* _AIX */
  
  #if defined(__APPLE__) && !TARGET_OS_IPHONE
  # include <AvailabilityMacros.h>
  #endif
  
  #if defined(CMAKE_BOOTSTRAP)
  # undef pthread_atfork
  # define pthread_atfork(prepare, parent, child) \
       uv__pthread_atfork(prepare, parent, child)
  int uv__pthread_atfork(void (*prepare)(void), void (*parent)(void),
                         void (*child)(void));
  # undef pthread_sigmask
  # define pthread_sigmask(how, set, oldset) \
       uv__pthread_sigmask(how, set, oldset)
  int uv__pthread_sigmask(int how, const sigset_t* set, sigset_t* oset);
  #elif defined(__ANDROID__)
  int uv__pthread_sigmask(int how, const sigset_t* set, sigset_t* oset);
  # ifdef pthread_sigmask
  # undef pthread_sigmask
  # endif
  # define pthread_sigmask(how, set, oldset) uv__pthread_sigmask(how, set, oldset)
  #endif
  
  #define ACCESS_ONCE(type, var)                                                \
    (*(volatile type*) &(var))
  
  #define ROUND_UP(a, b)                                                        \
    ((a) % (b) ? ((a) + (b)) - ((a) % (b)) : (a))
  
  #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)
  
  /* The __clang__ and __INTEL_COMPILER checks are superfluous because they
   * define __GNUC__. They are here to convey to you, dear reader, that these
   * macros are enabled when compiling with clang or icc.
   */
  #if defined(__clang__) ||                                                     \
      defined(__GNUC__) ||                                                      \
      defined(__INTEL_COMPILER) ||                                              \
      defined(__SUNPRO_C)
  # define UV_DESTRUCTOR(declaration) __attribute__((destructor)) declaration
  # define UV_UNUSED(declaration)     __attribute__((unused)) declaration
  #else
  # define UV_DESTRUCTOR(declaration) declaration
  # define UV_UNUSED(declaration)     declaration
  #endif
  
  /* Leans on the fact that, on Linux, POLLRDHUP == EPOLLRDHUP. */
  #ifdef POLLRDHUP
  # define UV__POLLRDHUP POLLRDHUP
  #else
  # define UV__POLLRDHUP 0x2000
  #endif
  
  #ifdef POLLPRI
  # define UV__POLLPRI POLLPRI
  #else
  # define UV__POLLPRI 0
  #endif
  
  #if !defined(O_CLOEXEC) && defined(__FreeBSD__)
  /*
   * It may be that we are just missing `__POSIX_VISIBLE >= 200809`.
   * Try using fixed value const and give up, if it doesn't work
   */
  # define O_CLOEXEC 0x00100000
  #endif
  
  typedef struct uv__stream_queued_fds_s uv__stream_queued_fds_t;
  
  /* 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_STREAM_READ_PARTIAL  = 0x100,  /* read(2) read less than requested. */
    UV_STREAM_READ_EOF      = 0x200,  /* read(2) read EOF. */
    UV_TCP_NODELAY          = 0x400,  /* Disable Nagle. */
    UV_TCP_KEEPALIVE        = 0x800,  /* Turn on keep-alive. */
    UV_TCP_SINGLE_ACCEPT    = 0x1000, /* Only accept() when idle. */
    UV_HANDLE_IPV6          = 0x10000, /* Handle is bound to a IPv6 socket. */
    UV_UDP_PROCESSING       = 0x20000, /* Handle is running the send callback queue. */
    UV_HANDLE_BOUND         = 0x40000  /* Handle is bound to an address and port */
  };
  
  /* loop flags */
  enum {
    UV_LOOP_BLOCK_SIGPROF = 1
  };
  
  /* flags of excluding ifaddr */
  enum {
    UV__EXCLUDE_IFPHYS,
    UV__EXCLUDE_IFADDR
  };
  
  typedef enum {
    UV_CLOCK_PRECISE = 0,  /* Use the highest resolution clock available. */
    UV_CLOCK_FAST = 1      /* Use the fastest clock with <= 1ms granularity. */
  } uv_clocktype_t;
  
  struct uv__stream_queued_fds_s {
    unsigned int size;
    unsigned int offset;
    int fds[1];
  };
  
  
  #if defined(_AIX) || \
      defined(__APPLE__) || \
      defined(__DragonFly__) || \
      defined(__FreeBSD__) || \
      defined(__FreeBSD_kernel__) || \
      (defined(__linux__) && !defined(__sparc__)) || \
      defined(__OpenBSD__) || \
      defined(__NetBSD__)
  #define uv__cloexec uv__cloexec_ioctl
  #define uv__nonblock uv__nonblock_ioctl
  #else
  #define uv__cloexec uv__cloexec_fcntl
  #define uv__nonblock uv__nonblock_fcntl
  #endif
  
  /* core */
  int uv__cloexec_ioctl(int fd, int set);
  int uv__cloexec_fcntl(int fd, int set);
  int uv__nonblock_ioctl(int fd, int set);
  int uv__nonblock_fcntl(int fd, int set);
  int uv__close(int fd);
  int uv__close_nocheckstdio(int fd);
  int uv__socket(int domain, int type, int protocol);
  int uv__dup(int fd);
  ssize_t uv__recvmsg(int fd, struct msghdr *msg, int flags);
  void uv__make_close_pending(uv_handle_t* handle);
  int uv__getiovmax(void);
  
  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);
  int uv__io_check_fd(uv_loop_t* loop, int fd);
  void uv__io_poll(uv_loop_t* loop, int timeout); /* in milliseconds or -1 */
  int uv__io_fork(uv_loop_t* loop);
  
  /* async */
  void uv__async_stop(uv_loop_t* loop);
  int uv__async_fork(uv_loop_t* loop);
  
  
  /* 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);
  
  /* 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);
  #if defined(__APPLE__)
  int uv__stream_try_select(uv_stream_t* stream, int* fd);
  #endif /* defined(__APPLE__) */
  void uv__server_io(uv_loop_t* loop, uv__io_t* w, unsigned int events);
  int uv__accept(int sockfd);
  int uv__dup2_cloexec(int oldfd, int newfd);
  int uv__open_cloexec(const char* path, int flags);
  
  /* 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);
  int uv__signal_loop_fork(uv_loop_t* loop);
  
  /* platform specific */
  uint64_t uv__hrtime(uv_clocktype_t type);
  int uv__kqueue_init(uv_loop_t* loop);
  int uv__platform_loop_init(uv_loop_t* loop);
  void uv__platform_loop_delete(uv_loop_t* loop);
  void uv__platform_invalidate_fd(uv_loop_t* loop, int fd);
  
  /* 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);
  uv_handle_type uv__handle_type(int fd);
  FILE* uv__open_file(const char* path);
  int uv__getpwuid_r(uv_passwd_t* pwd);
  
  
  #if defined(__APPLE__) && !defined(CMAKE_BOOTSTRAP)
  int uv___stream_fd(const uv_stream_t* handle);
  #define uv__stream_fd(handle) (uv___stream_fd((const 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__)
  
  int uv__fsevents_init(uv_fs_event_t* handle);
  int uv__fsevents_close(uv_fs_event_t* handle);
  void uv__fsevents_loop_delete(uv_loop_t* loop);
  
  /* 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__) */
  
  UV_UNUSED(static void uv__update_time(uv_loop_t* loop)) {
    /* Use a fast time source if available.  We only need millisecond precision.
     */
    loop->time = uv__hrtime(UV_CLOCK_FAST) / 1000000;
  }
  
  UV_UNUSED(static char* uv__basename_r(const char* path)) {
    char* s;
  
    s = strrchr(path, '/');
    if (s == NULL)
      return (char*) path;
  
    return s + 1;
  }
  
  #if defined(__linux__)
  int uv__inotify_fork(uv_loop_t* loop, void* old_watchers);
  #endif
  
  #endif /* UV_UNIX_INTERNAL_H_ */
  