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 "uv-eio.h"
  
  #include <assert.h>
  #include <stdlib.h> /* abort */
  #include <stddef.h> /* offsetof */
  
  #if __STRICT_ANSI__
  # define inline __inline
  #endif
  
  #undef HAVE_FUTIMES
  #undef HAVE_KQUEUE
  #undef HAVE_PORTS_FS
  
  #if defined(__linux__)
  
  # undef HAVE_SYS_UTIMESAT
  # undef HAVE_SYS_PIPE2
  # undef HAVE_SYS_ACCEPT4
  
  # undef _GNU_SOURCE
  # define _GNU_SOURCE
  
  # include <linux/version.h>
  # include <sys/syscall.h>
  # include <features.h>
  # include <unistd.h>
  
  # if __NR_utimensat
  #  define HAVE_SYS_UTIMESAT 1
  # endif
  # if __NR_pipe2
  #  define HAVE_SYS_PIPE2 1
  # endif
  # if __NR_accept4
  #  define HAVE_SYS_ACCEPT4 1
  # endif
  
  # ifndef O_CLOEXEC
  #  define O_CLOEXEC 02000000
  # endif
  
  # ifndef SOCK_CLOEXEC
  #  define SOCK_CLOEXEC O_CLOEXEC
  # endif
  
  # ifndef SOCK_NONBLOCK
  #  define SOCK_NONBLOCK O_NONBLOCK
  # endif
  
  # if HAVE_SYS_UTIMESAT
  inline static int sys_utimesat(int dirfd,
                                 const char* path,
                                 const struct timespec times[2],
                                 int flags)
  {
    return syscall(__NR_utimensat, dirfd, path, times, flags);
  }
  inline static int sys_futimes(int fd, const struct timeval times[2])
  {
    struct timespec ts[2];
    ts[0].tv_sec = times[0].tv_sec, ts[0].tv_nsec = times[0].tv_usec * 1000;
    ts[1].tv_sec = times[1].tv_sec, ts[1].tv_nsec = times[1].tv_usec * 1000;
    return sys_utimesat(fd, NULL, ts, 0);
  }
  #  undef HAVE_FUTIMES
  #  define HAVE_FUTIMES 1
  #  define futimes(fd, times) sys_futimes(fd, times)
  # endif /* HAVE_SYS_FUTIMESAT */
  
  # if HAVE_SYS_PIPE2
  inline static int sys_pipe2(int pipefd[2], int flags)
  {
    return syscall(__NR_pipe2, pipefd, flags);
  }
  # endif /* HAVE_SYS_PIPE2 */
  
  # if HAVE_SYS_ACCEPT4
  inline static int sys_accept4(int fd,
                                struct sockaddr* addr,
                                socklen_t* addrlen,
                                int flags)
  {
    return syscall(__NR_accept4, fd, addr, addrlen, flags);
  }
  # endif /* HAVE_SYS_ACCEPT4 */
  
  #endif /* __linux__ */
  
  #if defined(__sun)
  # include <sys/port.h>
  # include <port.h>
  # ifdef PORT_SOURCE_FILE
  #  define HAVE_PORTS_FS 1
  # endif
  #endif /* __sun */
  
  #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__sun)
  # define HAVE_FUTIMES 1
  #endif
  
  /* FIXME exact copy of the #ifdef guard in uv-unix.h */
  #if (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1060) \
    || defined(__FreeBSD__) \
    || defined(__OpenBSD__) \
    || defined(__NetBSD__)
  # define HAVE_KQUEUE 1
  #endif
  
  #define container_of(ptr, type, member) \
    ((type *) ((char *) (ptr) - offsetof(type, member)))
  
  #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)
  
  /* flags */
  enum {
    UV_CLOSING       = 0x01,   /* uv_close() called but not finished. */
    UV_CLOSED        = 0x02,   /* close(2) finished. */
    UV_READING       = 0x04,   /* uv_read_start() called. */
    UV_SHUTTING      = 0x08,   /* uv_shutdown() called but not complete. */
    UV_SHUT          = 0x10,   /* Write side closed. */
    UV_READABLE      = 0x20,   /* The stream is readable */
    UV_WRITABLE      = 0x40,   /* The stream is writable */
    UV_TCP_NODELAY   = 0x080,  /* Disable Nagle. */
    UV_TCP_KEEPALIVE = 0x100   /* Turn on keep-alive. */
  };
  
  /* core */
  void uv__handle_init(uv_loop_t* loop, uv_handle_t* handle, uv_handle_type type);
  int uv__nonblock(int fd, int set) __attribute__((unused));
  int uv__cloexec(int fd, int set) __attribute__((unused));
  int uv__socket(int domain, int type, int protocol);
  int uv__dup(int fd);
  
  /* We used to handle EINTR in uv__close() but linux 2.6 will have closed the
   * file descriptor anyway, even on EINTR. Retrying in that case isn't merely
   * useless, it's actively harmful - the file descriptor may have been acquired
   * by another thread.
   */
  #define uv__close(fd) close(fd)
  
  /* error */
  uv_err_code uv_translate_sys_error(int sys_errno);
  void uv_fatal_error(const int errorno, const char* syscall);
  
  /* requests */
  void uv__req_init(uv_loop_t* loop, uv_req_t*);
  
  /* 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__stream_io(EV_P_ ev_io* watcher, int revents);
  void uv__server_io(EV_P_ ev_io* watcher, int revents);
  int uv__accept(int sockfd, struct sockaddr* saddr, socklen_t len);
  int uv__connect(uv_connect_t* req, uv_stream_t* stream, struct sockaddr* addr,
      socklen_t addrlen, uv_connect_cb cb);
  
  /* tcp */
  int uv_tcp_listen(uv_tcp_t* tcp, int backlog, uv_connection_cb cb);
  int uv__tcp_nodelay(uv_tcp_t* handle, int enable);
  int uv__tcp_keepalive(uv_tcp_t* handle, int enable, unsigned int delay);
  
  /* pipe */
  int uv_pipe_listen(uv_pipe_t* handle, int backlog, uv_connection_cb cb);
  void uv__pipe_accept(EV_P_ ev_io* watcher, int revents);
  int uv_pipe_cleanup(uv_pipe_t* handle);
  
  /* udp */
  void uv__udp_start_close(uv_udp_t* handle);
  void uv__udp_finish_close(uv_udp_t* handle);
  
  /* fs */
  void uv__fs_event_destroy(uv_fs_event_t* handle);
  
  #define UV__F_IPC        (1 << 0)
  #define UV__F_NONBLOCK   (1 << 1)
  int uv__make_socketpair(int fds[2], int flags);
  int uv__make_pipe(int fds[2], int flags);
  
  #endif /* UV_UNIX_INTERNAL_H_ */
  