feat(pty): add initial pty node

2025-05-24 03:35:32 +02:00 · 2024-02-24 19:47:12 +13:00 · 2024-02-24 19:47:12 +13:00 · 1514f42b54
commit 1514f42b54
parent d223a458cd
21 changed files with 2819 additions and 71 deletions
--- a/addons/godot_xterm/native/src_old/pty_unix_new.cpp
+++ b/addons/godot_xterm/native/src_old/pty_unix_new.cpp
@ -0,0 +1,827 @@
+/**
+ * Copyright (c) 2012-2015, Christopher Jeffrey (MIT License)
+ * Copyright (c) 2017, Daniel Imms (MIT License)
+ * Copyright (c) 2024, Leroy Hopson (MIT License)
+ * 
+ * SPDX-License-Identifier: MIT
+ *
+ * pty.cc:
+ *   This file is responsible for starting processes
+ *   with pseudo-terminal file descriptors.
+ *
+ * See:
+ *   man pty
+ *   man tty_ioctl
+ *   man termios
+ *   man forkpty
+ */
+
+/**
+ * Includes
+ */
+
+using namespace godot;
+
+#include <godot_cpp/variant/variant.hpp>
+#include <uv.h>
+
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <signal.h>
+
+/* forkpty */
+/* http://www.gnu.org/software/gnulib/manual/html_node/forkpty.html */
+#if defined(__linux__)
+#include <pty.h>
+#elif defined(__APPLE__)
+#include <util.h>
+#elif defined(__FreeBSD__)
+#include <libutil.h>
+#endif
+
+/* Some platforms name VWERASE and VDISCARD differently */
+#if !defined(VWERASE) && defined(VWERSE)
+#define VWERASE	VWERSE
+#endif
+#if !defined(VDISCARD) && defined(VDISCRD)
+#define VDISCARD	VDISCRD
+#endif
+
+/* for pty_getproc */
+#if defined(__linux__)
+#include <stdio.h>
+#include <stdint.h>
+#elif defined(__APPLE__)
+#include <libproc.h>
+#include <os/availability.h>
+#include <paths.h>
+#include <spawn.h>
+#include <sys/event.h>
+#include <termios.h>
+#endif
+
+/* NSIG - macro for highest signal + 1, should be defined */
+#ifndef NSIG
+#define NSIG 32
+#endif
+
+/* macOS 10.14 back does not define this constant */
+#ifndef POSIX_SPAWN_SETSID
+  #define POSIX_SPAWN_SETSID 1024
+#endif
+
+/* environ for execvpe */
+/* node/src/node_child_process.cc */
+#if !defined(__APPLE__)
+extern char **environ;
+#endif
+
+#if defined(__APPLE__)
+extern "C" {
+// Changes the current thread's directory to a path or directory file
+// descriptor. libpthread only exposes a syscall wrapper starting in
+// macOS 10.12, but the system call dates back to macOS 10.5. On older OSes,
+// the syscall is issued directly.
+int pthread_chdir_np(const char* dir) API_AVAILABLE(macosx(10.12));
+int pthread_fchdir_np(int fd) API_AVAILABLE(macosx(10.12));
+}
+
+#define HANDLE_EINTR(x) ({ \
+  int eintr_wrapper_counter = 0; \
+  decltype(x) eintr_wrapper_result; \
+  do { \
+    eintr_wrapper_result = (x); \
+  } while (eintr_wrapper_result == -1 && errno == EINTR && \
+           eintr_wrapper_counter++ < 100); \
+  eintr_wrapper_result; \
+})
+#endif
+
+/**
+ * Structs
+ */
+
+struct pty_baton {
+  Nan::Persistent<v8::Function> cb;
+  int exit_code;
+  int signal_code;
+  pid_t pid;
+  uv_async_t async;
+  uv_thread_t tid;
+};
+
+/**
+ * Methods
+ */
+
+NAN_METHOD(PtyFork);
+NAN_METHOD(PtyOpen);
+NAN_METHOD(PtyResize);
+NAN_METHOD(PtyGetProc);
+
+/**
+ * Functions
+ */
+
+static int
+pty_nonblock(int);
+
+#if defined(__APPLE__)
+static char *
+pty_getproc(int);
+#else
+static char *
+pty_getproc(int, char *);
+#endif
+
+static void
+pty_waitpid(void *);
+
+static void
+pty_after_waitpid(uv_async_t *);
+
+static void
+pty_after_close(uv_handle_t *);
+
+#if defined(__APPLE__) || defined(__OpenBSD__)
+static void
+pty_posix_spawn(char** argv, char** env,
+                const struct termios *termp,
+                const struct winsize *winp,
+                int* master,
+                pid_t* pid,
+                int* err);
+#endif
+
+Dictionary fork(
+  const String &p_file,
+  const PackedStringArray &p_args,
+  const PackedStringArray &p_env,
+  const String &p_cwd,
+  const int p_cols,
+  const int p_rows,
+  const int p_uid,
+  const int p_gid,
+  const bool p_utf8,
+  const String &p_helper_path,
+  const Callable &p_on_exit
+) {
+  // file
+  std::string file = p_file.utf8().get_data();
+
+  // args
+  v8::Local<v8::Array> argv_ = v8::Local<v8::Array>::Cast(info[1]);
+
+  // env
+  v8::Local<v8::Array> env_ = v8::Local<v8::Array>::Cast(info[2]);
+  int envc = env_->Length();
+  char **env = new char*[envc+1];
+  env[envc] = NULL;
+  for (int i = 0; i < envc; i++) {
+    Nan::Utf8String pair(Nan::Get(env_, i).ToLocalChecked());
+    env[i] = strdup(*pair);
+  }
+
+  // cwd
+  Nan::Utf8String cwd_(info[3]);
+
+  // size
+  struct winsize winp;
+  winp.ws_col = info[4]->IntegerValue(Nan::GetCurrentContext()).FromJust();
+  winp.ws_row = info[5]->IntegerValue(Nan::GetCurrentContext()).FromJust();
+  winp.ws_xpixel = 0;
+  winp.ws_ypixel = 0;
+
+#if !defined(__APPLE__)
+  // uid / gid
+  int uid = info[6]->IntegerValue(Nan::GetCurrentContext()).FromJust();
+  int gid = info[7]->IntegerValue(Nan::GetCurrentContext()).FromJust();
+#endif
+
+  // termios
+  struct termios t = termios();
+  struct termios *term = &t;
+  term->c_iflag = ICRNL | IXON | IXANY | IMAXBEL | BRKINT;
+  if (Nan::To<bool>(info[8]).FromJust()) {
+#if defined(IUTF8)
+    term->c_iflag |= IUTF8;
+#endif
+  }
+  term->c_oflag = OPOST | ONLCR;
+  term->c_cflag = CREAD | CS8 | HUPCL;
+  term->c_lflag = ICANON | ISIG | IEXTEN | ECHO | ECHOE | ECHOK | ECHOKE | ECHOCTL;
+
+  term->c_cc[VEOF] = 4;
+  term->c_cc[VEOL] = -1;
+  term->c_cc[VEOL2] = -1;
+  term->c_cc[VERASE] = 0x7f;
+  term->c_cc[VWERASE] = 23;
+  term->c_cc[VKILL] = 21;
+  term->c_cc[VREPRINT] = 18;
+  term->c_cc[VINTR] = 3;
+  term->c_cc[VQUIT] = 0x1c;
+  term->c_cc[VSUSP] = 26;
+  term->c_cc[VSTART] = 17;
+  term->c_cc[VSTOP] = 19;
+  term->c_cc[VLNEXT] = 22;
+  term->c_cc[VDISCARD] = 15;
+  term->c_cc[VMIN] = 1;
+  term->c_cc[VTIME] = 0;
+
+  #if (__APPLE__)
+  term->c_cc[VDSUSP] = 25;
+  term->c_cc[VSTATUS] = 20;
+  #endif
+
+  cfsetispeed(term, B38400);
+  cfsetospeed(term, B38400);
+
+  // helperPath
+  Nan::Utf8String helper_path(info[9]);
+
+  pid_t pid;
+  int master;
+#if defined(__APPLE__)
+  int argc = argv_->Length();
+  int argl = argc + 4;
+  char **argv = new char*[argl];
+  argv[0] = strdup(*helper_path);
+  argv[1] = strdup(*cwd_);
+  argv[2] = strdup(*file);
+  argv[argl - 1] = NULL;
+  for (int i = 0; i < argc; i++) {
+    Nan::Utf8String arg(Nan::Get(argv_, i).ToLocalChecked());
+    argv[i + 3] = strdup(*arg);
+  }
+
+  int err = -1;
+  pty_posix_spawn(argv, env, term, &winp, &master, &pid, &err);
+  if (err != 0) {
+    Nan::ThrowError("posix_spawnp failed.");
+    goto done;
+  }
+  if (pty_nonblock(master) == -1) {
+    Nan::ThrowError("Could not set master fd to nonblocking.");
+    goto done;
+  }
+#else
+  int argc = argv_->Length();
+  int argl = argc + 2;
+  char **argv = new char*[argl];
+  argv[0] = strdup(*file);
+  argv[argl - 1] = NULL;
+  for (int i = 0; i < argc; i++) {
+    Nan::Utf8String arg(Nan::Get(argv_, i).ToLocalChecked());
+    argv[i + 1] = strdup(*arg);
+  }
+
+  char* cwd = strdup(*cwd_);
+  sigset_t newmask, oldmask;
+  struct sigaction sig_action;
+  // temporarily block all signals
+  // this is needed due to a race condition in openpty
+  // and to avoid running signal handlers in the child
+  // before exec* happened
+  sigfillset(&newmask);
+  pthread_sigmask(SIG_SETMASK, &newmask, &oldmask);
+
+  pid = forkpty(&master, nullptr, static_cast<termios*>(term), static_cast<winsize*>(&winp));
+
+  if (!pid) {
+    // remove all signal handler from child
+    sig_action.sa_handler = SIG_DFL;
+    sig_action.sa_flags = 0;
+    sigemptyset(&sig_action.sa_mask);
+    for (int i = 0 ; i < NSIG ; i++) {    // NSIG is a macro for all signals + 1
+      sigaction(i, &sig_action, NULL);
+    }
+  } else {
+    for (int i = 0; i < argl; i++) free(argv[i]);
+    delete[] argv;
+
+    for (int i = 0; i < envc; i++) free(env[i]);
+    delete[] env;
+
+    free(cwd);
+  }
+
+  // reenable signals
+  pthread_sigmask(SIG_SETMASK, &oldmask, NULL);
+
+  switch (pid) {
+    case -1:
+      Nan::ThrowError("forkpty(3) failed.");
+      goto done;
+    case 0:
+      if (strlen(cwd)) {
+        if (chdir(cwd) == -1) {
+          perror("chdir(2) failed.");
+          _exit(1);
+        }
+      }
+
+      if (uid != -1 && gid != -1) {
+        if (setgid(gid) == -1) {
+          perror("setgid(2) failed.");
+          _exit(1);
+        }
+        if (setuid(uid) == -1) {
+          perror("setuid(2) failed.");
+          _exit(1);
+        }
+      }
+
+      {
+        char **old = environ;
+        environ = env;
+        execvp(argv[0], argv);
+        environ = old;
+        perror("execvp(3) failed.");
+        _exit(1);
+      }
+    default:
+      if (pty_nonblock(master) == -1) {
+        Nan::ThrowError("Could not set master fd to nonblocking.");
+        goto done;
+      }
+  }
+#endif
+
+  {
+    v8::Local<v8::Object> obj = Nan::New<v8::Object>();
+    Nan::Set(obj,
+      Nan::New<v8::String>("fd").ToLocalChecked(),
+      Nan::New<v8::Number>(master));
+    Nan::Set(obj,
+      Nan::New<v8::String>("pid").ToLocalChecked(),
+      Nan::New<v8::Number>(pid));
+    Nan::Set(obj,
+      Nan::New<v8::String>("pty").ToLocalChecked(),
+      Nan::New<v8::String>(ptsname(master)).ToLocalChecked());
+
+    pty_baton *baton = new pty_baton();
+    baton->exit_code = 0;
+    baton->signal_code = 0;
+    baton->cb.Reset(v8::Local<v8::Function>::Cast(info[10]));
+    baton->pid = pid;
+    baton->async.data = baton;
+
+    uv_async_init(uv_default_loop(), &baton->async, pty_after_waitpid);
+
+    uv_thread_create(&baton->tid, pty_waitpid, static_cast<void*>(baton));
+
+    return info.GetReturnValue().Set(obj);
+  }
+
+done:
+#if defined(__APPLE__)
+  for (int i = 0; i < argl; i++) free(argv[i]);
+  delete[] argv;
+
+  for (int i = 0; i < envc; i++) free(env[i]);
+  delete[] env;
+#endif
+  return info.GetReturnValue().SetUndefined();
+}
+
+NAN_METHOD(PtyOpen) {
+  Nan::HandleScope scope;
+
+  if (info.Length() != 2 ||
+      !info[0]->IsNumber() ||
+      !info[1]->IsNumber()) {
+    return Nan::ThrowError("Usage: pty.open(cols, rows)");
+  }
+
+  // size
+  struct winsize winp;
+  winp.ws_col = info[0]->IntegerValue(Nan::GetCurrentContext()).FromJust();
+  winp.ws_row = info[1]->IntegerValue(Nan::GetCurrentContext()).FromJust();
+  winp.ws_xpixel = 0;
+  winp.ws_ypixel = 0;
+
+  // pty
+  int master, slave;
+  int ret = openpty(&master, &slave, nullptr, NULL, static_cast<winsize*>(&winp));
+
+  if (ret == -1) {
+    return Nan::ThrowError("openpty(3) failed.");
+  }
+
+  if (pty_nonblock(master) == -1) {
+    return Nan::ThrowError("Could not set master fd to nonblocking.");
+  }
+
+  if (pty_nonblock(slave) == -1) {
+    return Nan::ThrowError("Could not set slave fd to nonblocking.");
+  }
+
+  v8::Local<v8::Object> obj = Nan::New<v8::Object>();
+  Nan::Set(obj,
+    Nan::New<v8::String>("master").ToLocalChecked(),
+    Nan::New<v8::Number>(master));
+  Nan::Set(obj,
+    Nan::New<v8::String>("slave").ToLocalChecked(),
+    Nan::New<v8::Number>(slave));
+  Nan::Set(obj,
+    Nan::New<v8::String>("pty").ToLocalChecked(),
+    Nan::New<v8::String>(ptsname(master)).ToLocalChecked());
+
+  return info.GetReturnValue().Set(obj);
+}
+
+NAN_METHOD(PtyResize) {
+  Nan::HandleScope scope;
+
+  if (info.Length() != 3 ||
+      !info[0]->IsNumber() ||
+      !info[1]->IsNumber() ||
+      !info[2]->IsNumber()) {
+    return Nan::ThrowError("Usage: pty.resize(fd, cols, rows)");
+  }
+
+  int fd = info[0]->IntegerValue(Nan::GetCurrentContext()).FromJust();
+
+  struct winsize winp;
+  winp.ws_col = info[1]->IntegerValue(Nan::GetCurrentContext()).FromJust();
+  winp.ws_row = info[2]->IntegerValue(Nan::GetCurrentContext()).FromJust();
+  winp.ws_xpixel = 0;
+  winp.ws_ypixel = 0;
+
+  if (ioctl(fd, TIOCSWINSZ, &winp) == -1) {
+    switch (errno) {
+      case EBADF: return Nan::ThrowError("ioctl(2) failed, EBADF");
+      case EFAULT: return Nan::ThrowError("ioctl(2) failed, EFAULT");
+      case EINVAL: return Nan::ThrowError("ioctl(2) failed, EINVAL");
+      case ENOTTY: return Nan::ThrowError("ioctl(2) failed, ENOTTY");
+    }
+    return Nan::ThrowError("ioctl(2) failed");
+  }
+
+  return info.GetReturnValue().SetUndefined();
+}
+
+/**
+ * Foreground Process Name
+ */
+NAN_METHOD(PtyGetProc) {
+  Nan::HandleScope scope;
+
+#if defined(__APPLE__)
+  if (info.Length() != 1 ||
+      !info[0]->IsNumber()) {
+    return Nan::ThrowError("Usage: pty.process(pid)");
+  }
+
+  int pid = info[0]->IntegerValue(Nan::GetCurrentContext()).FromJust();
+  char *name = pty_getproc(pid);
+#else
+  if (info.Length() != 2 ||
+      !info[0]->IsNumber() ||
+      !info[1]->IsString()) {
+    return Nan::ThrowError("Usage: pty.process(fd, tty)");
+  }
+
+  int fd = info[0]->IntegerValue(Nan::GetCurrentContext()).FromJust();
+
+  Nan::Utf8String tty_(info[1]);
+  char *tty = strdup(*tty_);
+  char *name = pty_getproc(fd, tty);
+  free(tty);
+#endif
+
+  if (name == NULL) {
+    return info.GetReturnValue().SetUndefined();
+  }
+
+  v8::Local<v8::String> name_ = Nan::New<v8::String>(name).ToLocalChecked();
+  free(name);
+  return info.GetReturnValue().Set(name_);
+}
+
+/**
+ * Nonblocking FD
+ */
+
+static int
+pty_nonblock(int fd) {
+  int flags = fcntl(fd, F_GETFL, 0);
+  if (flags == -1) return -1;
+  return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
+}
+
+/**
+ * pty_waitpid
+ * Wait for SIGCHLD to read exit status.
+ */
+
+static void
+pty_waitpid(void *data) {
+  int ret;
+  int stat_loc;
+  pty_baton *baton = static_cast<pty_baton*>(data);
+  errno = 0;
+#if defined(__APPLE__)
+  // Based on
+  // https://source.chromium.org/chromium/chromium/src/+/main:base/process/kill_mac.cc;l=35-69?
+  int kq = HANDLE_EINTR(kqueue());
+  struct kevent change = {0};
+  EV_SET(&change, baton->pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL);
+  ret = HANDLE_EINTR(kevent(kq, &change, 1, NULL, 0, NULL));
+  if (ret == -1) {
+    if (errno == ESRCH) {
+      // At this point, one of the following has occurred:
+      // 1. The process has died but has not yet been reaped.
+      // 2. The process has died and has already been reaped.
+      // 3. The process is in the process of dying. It's no longer
+      //    kqueueable, but it may not be waitable yet either. Mark calls
+      //    this case the "zombie death race".
+      ret = HANDLE_EINTR(waitpid(baton->pid, &stat_loc, WNOHANG));
+      if (ret == 0) {
+        ret = kill(baton->pid, SIGKILL);
+        if (ret != -1) {
+          HANDLE_EINTR(waitpid(baton->pid, &stat_loc, 0));
+        }
+      }
+    }
+  } else {
+    struct kevent event = {0};
+    ret = HANDLE_EINTR(kevent(kq, NULL, 0, &event, 1, NULL));
+    if (ret == 1) {
+      if ((event.fflags & NOTE_EXIT) &&
+          (event.ident == static_cast<uintptr_t>(baton->pid))) {
+        // The process is dead or dying. This won't block for long, if at
+        // all.
+        HANDLE_EINTR(waitpid(baton->pid, &stat_loc, 0));
+      }
+    }
+  }
+#else
+  if ((ret = waitpid(baton->pid, &stat_loc, 0)) != baton->pid) {
+    if (ret == -1 && errno == EINTR) {
+      return pty_waitpid(baton);
+    }
+    if (ret == -1 && errno == ECHILD) {
+      // XXX node v0.8.x seems to have this problem.
+      // waitpid is already handled elsewhere.
+      ;
+    } else {
+      assert(false);
+    }
+  }
+#endif
+
+  if (WIFEXITED(stat_loc)) {
+    baton->exit_code = WEXITSTATUS(stat_loc); // errno?
+  }
+
+  if (WIFSIGNALED(stat_loc)) {
+    baton->signal_code = WTERMSIG(stat_loc);
+  }
+
+  uv_async_send(&baton->async);
+}
+
+/**
+ * pty_after_waitpid
+ * Callback after exit status has been read.
+ */
+
+static void
+pty_after_waitpid(uv_async_t *async) {
+  Nan::HandleScope scope;
+  pty_baton *baton = static_cast<pty_baton*>(async->data);
+
+  v8::Local<v8::Value> argv[] = {
+    Nan::New<v8::Integer>(baton->exit_code),
+    Nan::New<v8::Integer>(baton->signal_code),
+  };
+
+  v8::Local<v8::Function> cb = Nan::New<v8::Function>(baton->cb);
+  baton->cb.Reset();
+  memset(&baton->cb, -1, sizeof(baton->cb));
+  Nan::AsyncResource resource("pty_after_waitpid");
+  resource.runInAsyncScope(Nan::GetCurrentContext()->Global(), cb, 2, argv);
+
+  uv_close((uv_handle_t *)async, pty_after_close);
+}
+
+/**
+ * pty_after_close
+ * uv_close() callback - free handle data
+ */
+
+static void
+pty_after_close(uv_handle_t *handle) {
+  uv_async_t *async = (uv_async_t *)handle;
+  pty_baton *baton = static_cast<pty_baton*>(async->data);
+  delete baton;
+}
+
+/**
+ * pty_getproc
+ * Taken from tmux.
+ */
+
+// Taken from: tmux (http://tmux.sourceforge.net/)
+// Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
+// Copyright (c) 2009 Joshua Elsasser <josh@elsasser.org>
+// Copyright (c) 2009 Todd Carson <toc@daybefore.net>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+// IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+// OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#if defined(__linux__)
+
+static char *
+pty_getproc(int fd, char *tty) {
+  FILE *f;
+  char *path, *buf;
+  size_t len;
+  int ch;
+  pid_t pgrp;
+  int r;
+
+  if ((pgrp = tcgetpgrp(fd)) == -1) {
+    return NULL;
+  }
+
+  r = asprintf(&path, "/proc/%lld/cmdline", (long long)pgrp);
+  if (r == -1 || path == NULL) return NULL;
+
+  if ((f = fopen(path, "r")) == NULL) {
+    free(path);
+    return NULL;
+  }
+
+  free(path);
+
+  len = 0;
+  buf = NULL;
+  while ((ch = fgetc(f)) != EOF) {
+    if (ch == '\0') break;
+    buf = (char *)realloc(buf, len + 2);
+    if (buf == NULL) return NULL;
+    buf[len++] = ch;
+  }
+
+  if (buf != NULL) {
+    buf[len] = '\0';
+  }
+
+  fclose(f);
+  return buf;
+}
+
+#elif defined(__APPLE__)
+
+static char *
+pty_getproc(int pid) {
+  char pname[MAXCOMLEN + 1];
+  if (!proc_name(pid, pname, sizeof(pname))) {
+    return NULL;
+  }
+
+  return strdup(pname);
+}
+
+#else
+
+static char *
+pty_getproc(int fd, char *tty) {
+  return NULL;
+}
+
+#endif
+
+#if defined(__APPLE__)
+static void
+pty_posix_spawn(char** argv, char** env,
+                const struct termios *termp,
+                const struct winsize *winp,
+                int* master,
+                pid_t* pid,
+                int* err) {
+  int low_fds[3];
+  size_t count = 0;
+
+  for (; count < 3; count++) {
+    low_fds[count] = posix_openpt(O_RDWR);
+    if (low_fds[count] >= STDERR_FILENO)
+      break;
+  }
+
+  int flags = POSIX_SPAWN_CLOEXEC_DEFAULT |
+              POSIX_SPAWN_SETSIGDEF |
+              POSIX_SPAWN_SETSIGMASK |
+              POSIX_SPAWN_SETSID;
+  *master = posix_openpt(O_RDWR);
+  if (*master == -1) {
+    return;
+  }
+
+  int res = grantpt(*master) || unlockpt(*master);
+  if (res == -1) {
+    return;
+  }
+
+  // Use TIOCPTYGNAME instead of ptsname() to avoid threading problems.
+  int slave;
+  char slave_pty_name[128];
+  res = ioctl(*master, TIOCPTYGNAME, slave_pty_name);
+  if (res == -1) {
+    return;
+  }
+
+  slave = open(slave_pty_name, O_RDWR | O_NOCTTY);
+  if (slave == -1) {
+    return;
+  }
+
+  if (termp) {
+    res = tcsetattr(slave, TCSANOW, termp);
+    if (res == -1) {
+      return;
+    };
+  }
+
+  if (winp) {
+    res = ioctl(slave, TIOCSWINSZ, winp);
+    if (res == -1) {
+      return;
+    }
+  }
+
+  posix_spawn_file_actions_t acts;
+  posix_spawn_file_actions_init(&acts);
+  posix_spawn_file_actions_adddup2(&acts, slave, STDIN_FILENO);
+  posix_spawn_file_actions_adddup2(&acts, slave, STDOUT_FILENO);
+  posix_spawn_file_actions_adddup2(&acts, slave, STDERR_FILENO);
+  posix_spawn_file_actions_addclose(&acts, slave);
+  posix_spawn_file_actions_addclose(&acts, *master);
+
+  posix_spawnattr_t attrs;
+  posix_spawnattr_init(&attrs);
+  *err = posix_spawnattr_setflags(&attrs, flags);
+  if (*err != 0) {
+    goto done;
+  }
+
+  sigset_t signal_set;
+  /* Reset all signal the child to their default behavior */
+  sigfillset(&signal_set);
+  *err = posix_spawnattr_setsigdefault(&attrs, &signal_set);
+  if (*err != 0) {
+    goto done;
+  }
+
+  /* Reset the signal mask for all signals */
+  sigemptyset(&signal_set);
+  *err = posix_spawnattr_setsigmask(&attrs, &signal_set);
+  if (*err != 0) {
+    goto done;
+  }
+
+  do
+    *err = posix_spawn(pid, argv[0], &acts, &attrs, argv, env);
+  while (*err == EINTR);
+done:
+  posix_spawn_file_actions_destroy(&acts);
+  posix_spawnattr_destroy(&attrs);
+
+  for (; count > 0; count--) {
+    close(low_fds[count]);
+  }
+}
+#endif
+
+/**
+ * Init
+ */
+
+NAN_MODULE_INIT(init) {
+  Nan::HandleScope scope;
+  Nan::Export(target, "fork", PtyFork);
+  Nan::Export(target, "open", PtyOpen);
+  Nan::Export(target, "resize", PtyResize);
+  Nan::Export(target, "process", PtyGetProc);
+}
+
+NODE_MODULE(pty, init)