Blame src/unix/tty.c

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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to
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 * deal in the Software without restriction, including without limitation the
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 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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 * sell copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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 * IN THE SOFTWARE.
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 */
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#include "uv.h"
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#include "internal.h"
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#include "spinlock.h"
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#include <stdlib.h>
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#include <assert.h>
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#include <unistd.h>
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#include <termios.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#if defined(__MVS__) && !defined(IMAXBEL)
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#define IMAXBEL 0
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#endif
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#if defined(__PASE__)
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/* On IBM i PASE, for better compatibility with running interactive programs in
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 * a 5250 environment, isatty() will return true for the stdin/stdout/stderr
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 * streams created by QSH/QP2TERM.
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 *
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 * For more, see docs on PASE_STDIO_ISATTY in
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 * https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_74/apis/pase_environ.htm
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 *
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 * This behavior causes problems for Node as it expects that if isatty() returns
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 * true that TTY ioctls will be supported by that fd (which is not an
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 * unreasonable expectation) and when they don't it crashes with assertion
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 * errors.
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 *
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 * Here, we create our own version of isatty() that uses ioctl() to identify
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 * whether the fd is *really* a TTY or not.
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 */
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static int isreallyatty(int file) {
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  int rc;
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  rc = !ioctl(file, TXISATTY + 0x81, NULL);
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  if (!rc && errno != EBADF)
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      errno = ENOTTY;
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  return rc;
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}
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#define isatty(fd) isreallyatty(fd)
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#endif
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static int orig_termios_fd = -1;
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static struct termios orig_termios;
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static uv_spinlock_t termios_spinlock = UV_SPINLOCK_INITIALIZER;
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static int uv__tty_is_slave(const int fd) {
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  int result;
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#if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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  int dummy;
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  result = ioctl(fd, TIOCGPTN, &dummy) != 0;
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#elif defined(__APPLE__)
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  char dummy[256];
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  result = ioctl(fd, TIOCPTYGNAME, &dummy) != 0;
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#elif defined(__NetBSD__)
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  /*
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   * NetBSD as an extension returns with ptsname(3) and ptsname_r(3) the slave
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   * device name for both descriptors, the master one and slave one.
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   *
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   * Implement function to compare major device number with pts devices.
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   *
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   * The major numbers are machine-dependent, on NetBSD/amd64 they are
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   * respectively:
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   *  - master tty: ptc - major 6
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   *  - slave tty:  pts - major 5
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   */
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  struct stat sb;
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  /* Lookup device's major for the pts driver and cache it. */
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  static devmajor_t pts = NODEVMAJOR;
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  if (pts == NODEVMAJOR) {
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    pts = getdevmajor("pts", S_IFCHR);
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    if (pts == NODEVMAJOR)
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      abort();
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  }
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  /* Lookup stat structure behind the file descriptor. */
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  if (fstat(fd, &sb) != 0)
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    abort();
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  /* Assert character device. */
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  if (!S_ISCHR(sb.st_mode))
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    abort();
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  /* Assert valid major. */
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  if (major(sb.st_rdev) == NODEVMAJOR)
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    abort();
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  result = (pts == major(sb.st_rdev));
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#else
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  /* Fallback to ptsname
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   */
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  result = ptsname(fd) == NULL;
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#endif
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  return result;
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}
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int uv_tty_init(uv_loop_t* loop, uv_tty_t* tty, int fd, int unused) {
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  uv_handle_type type;
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  int flags;
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  int newfd;
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  int r;
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  int saved_flags;
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  int mode;
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  char path[256];
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  (void)unused; /* deprecated parameter is no longer needed */
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  /* File descriptors that refer to files cannot be monitored with epoll.
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   * That restriction also applies to character devices like /dev/random
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   * (but obviously not /dev/tty.)
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   */
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  type = uv_guess_handle(fd);
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  if (type == UV_FILE || type == UV_UNKNOWN_HANDLE)
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    return UV_EINVAL;
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  flags = 0;
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  newfd = -1;
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  /* Save the fd flags in case we need to restore them due to an error. */
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  do
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    saved_flags = fcntl(fd, F_GETFL);
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  while (saved_flags == -1 && errno == EINTR);
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  if (saved_flags == -1)
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    return UV__ERR(errno);
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  mode = saved_flags & O_ACCMODE;
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  /* Reopen the file descriptor when it refers to a tty. This lets us put the
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   * tty in non-blocking mode without affecting other processes that share it
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   * with us.
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   *
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   * Example: `node | cat` - if we put our fd 0 in non-blocking mode, it also
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   * affects fd 1 of `cat` because both file descriptors refer to the same
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   * struct file in the kernel. When we reopen our fd 0, it points to a
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   * different struct file, hence changing its properties doesn't affect
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   * other processes.
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   */
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  if (type == UV_TTY) {
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    /* Reopening a pty in master mode won't work either because the reopened
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     * pty will be in slave mode (*BSD) or reopening will allocate a new
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     * master/slave pair (Linux). Therefore check if the fd points to a
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     * slave device.
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     */
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    if (uv__tty_is_slave(fd) && ttyname_r(fd, path, sizeof(path)) == 0)
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      r = uv__open_cloexec(path, mode | O_NOCTTY);
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    else
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      r = -1;
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    if (r < 0) {
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      /* fallback to using blocking writes */
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      if (mode != O_RDONLY)
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        flags |= UV_HANDLE_BLOCKING_WRITES;
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      goto skip;
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    }
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    newfd = r;
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    r = uv__dup2_cloexec(newfd, fd);
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    if (r < 0 && r != UV_EINVAL) {
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      /* EINVAL means newfd == fd which could conceivably happen if another
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       * thread called close(fd) between our calls to isatty() and open().
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       * That's a rather unlikely event but let's handle it anyway.
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       */
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      uv__close(newfd);
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      return r;
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    }
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    fd = newfd;
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  }
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skip:
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  uv__stream_init(loop, (uv_stream_t*) tty, UV_TTY);
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  /* If anything fails beyond this point we need to remove the handle from
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   * the handle queue, since it was added by uv__handle_init in uv_stream_init.
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   */
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  if (!(flags & UV_HANDLE_BLOCKING_WRITES))
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    uv__nonblock(fd, 1);
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#if defined(__APPLE__)
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  r = uv__stream_try_select((uv_stream_t*) tty, &fd;;
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  if (r) {
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    int rc = r;
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    if (newfd != -1)
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      uv__close(newfd);
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    QUEUE_REMOVE(&tty->handle_queue);
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    do
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      r = fcntl(fd, F_SETFL, saved_flags);
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    while (r == -1 && errno == EINTR);
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    return rc;
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  }
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#endif
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  if (mode != O_WRONLY)
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    flags |= UV_HANDLE_READABLE;
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  if (mode != O_RDONLY)
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    flags |= UV_HANDLE_WRITABLE;
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  uv__stream_open((uv_stream_t*) tty, fd, flags);
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  tty->mode = UV_TTY_MODE_NORMAL;
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  return 0;
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}
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static void uv__tty_make_raw(struct termios* tio) {
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  assert(tio != NULL);
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#if defined __sun || defined __MVS__
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  /*
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   * This implementation of cfmakeraw for Solaris and derivatives is taken from
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   * http://www.perkin.org.uk/posts/solaris-portability-cfmakeraw.html.
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   */
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  tio->c_iflag &= ~(IMAXBEL | IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR |
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                    IGNCR | ICRNL | IXON);
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  tio->c_oflag &= ~OPOST;
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  tio->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
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  tio->c_cflag &= ~(CSIZE | PARENB);
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  tio->c_cflag |= CS8;
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#else
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  cfmakeraw(tio);
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#endif /* #ifdef __sun */
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}
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int uv_tty_set_mode(uv_tty_t* tty, uv_tty_mode_t mode) {
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  struct termios tmp;
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  int fd;
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  if (tty->mode == (int) mode)
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    return 0;
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  fd = uv__stream_fd(tty);
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  if (tty->mode == UV_TTY_MODE_NORMAL && mode != UV_TTY_MODE_NORMAL) {
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    if (tcgetattr(fd, &tty->orig_termios))
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      return UV__ERR(errno);
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    /* This is used for uv_tty_reset_mode() */
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    uv_spinlock_lock(&termios_spinlock);
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    if (orig_termios_fd == -1) {
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      orig_termios = tty->orig_termios;
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      orig_termios_fd = fd;
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    }
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    uv_spinlock_unlock(&termios_spinlock);
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  }
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  tmp = tty->orig_termios;
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  switch (mode) {
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    case UV_TTY_MODE_NORMAL:
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      break;
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    case UV_TTY_MODE_RAW:
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      tmp.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
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      tmp.c_oflag |= (ONLCR);
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      tmp.c_cflag |= (CS8);
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      tmp.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
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      tmp.c_cc[VMIN] = 1;
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      tmp.c_cc[VTIME] = 0;
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      break;
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    case UV_TTY_MODE_IO:
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      uv__tty_make_raw(&tmp);
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      break;
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  }
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  /* Apply changes after draining */
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  if (tcsetattr(fd, TCSADRAIN, &tmp))
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    return UV__ERR(errno);
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  tty->mode = mode;
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  return 0;
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}
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int uv_tty_get_winsize(uv_tty_t* tty, int* width, int* height) {
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  struct winsize ws;
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  int err;
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  do
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    err = ioctl(uv__stream_fd(tty), TIOCGWINSZ, &ws);
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  while (err == -1 && errno == EINTR);
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  if (err == -1)
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    return UV__ERR(errno);
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  *width = ws.ws_col;
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  *height = ws.ws_row;
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  return 0;
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}
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uv_handle_type uv_guess_handle(uv_file file) {
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  struct sockaddr sa;
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  struct stat s;
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  socklen_t len;
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  int type;
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  if (file < 0)
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    return UV_UNKNOWN_HANDLE;
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  if (isatty(file))
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    return UV_TTY;
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  if (fstat(file, &s))
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    return UV_UNKNOWN_HANDLE;
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  if (S_ISREG(s.st_mode))
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    return UV_FILE;
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  if (S_ISCHR(s.st_mode))
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    return UV_FILE;  /* XXX UV_NAMED_PIPE? */
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  if (S_ISFIFO(s.st_mode))
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    return UV_NAMED_PIPE;
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  if (!S_ISSOCK(s.st_mode))
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    return UV_UNKNOWN_HANDLE;
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  len = sizeof(type);
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  if (getsockopt(file, SOL_SOCKET, SO_TYPE, &type, &len))
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    return UV_UNKNOWN_HANDLE;
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  len = sizeof(sa);
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  if (getsockname(file, &sa, &len))
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    return UV_UNKNOWN_HANDLE;
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  if (type == SOCK_DGRAM)
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    if (sa.sa_family == AF_INET || sa.sa_family == AF_INET6)
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      return UV_UDP;
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  if (type == SOCK_STREAM) {
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#if defined(_AIX) || defined(__DragonFly__)
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    /* on AIX/DragonFly the getsockname call returns an empty sa structure
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     * for sockets of type AF_UNIX.  For all other types it will
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     * return a properly filled in structure.
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     */
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    if (len == 0)
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      return UV_NAMED_PIPE;
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#endif /* defined(_AIX) || defined(__DragonFly__) */
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    if (sa.sa_family == AF_INET || sa.sa_family == AF_INET6)
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      return UV_TCP;
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    if (sa.sa_family == AF_UNIX)
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      return UV_NAMED_PIPE;
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  }
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  return UV_UNKNOWN_HANDLE;
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}
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/* This function is async signal-safe, meaning that it's safe to call from
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 * inside a signal handler _unless_ execution was inside uv_tty_set_mode()'s
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 * critical section when the signal was raised.
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 */
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int uv_tty_reset_mode(void) {
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  int saved_errno;
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  int err;
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  saved_errno = errno;
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  if (!uv_spinlock_trylock(&termios_spinlock))
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    return UV_EBUSY;  /* In uv_tty_set_mode(). */
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  err = 0;
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  if (orig_termios_fd != -1)
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    if (tcsetattr(orig_termios_fd, TCSANOW, &orig_termios))
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      err = UV__ERR(errno);
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  uv_spinlock_unlock(&termios_spinlock);
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  errno = saved_errno;
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  return err;
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}
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void uv_tty_set_vterm_state(uv_tty_vtermstate_t state) {
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}
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int uv_tty_get_vterm_state(uv_tty_vtermstate_t* state) {
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  return UV_ENOTSUP;
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}