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direct/src/plugin/p3dPythonMain.cxx

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+// Filename: p3dPythonMain.cxx
+// Created by:  drose (29Aug09)
+//
+////////////////////////////////////////////////////////////////////
+//
+// PANDA 3D SOFTWARE
+// Copyright (c) Carnegie Mellon University.  All rights reserved.
+//
+// All use of this software is subject to the terms of the revised BSD
+// license.  You should have received a copy of this license along
+// with this source code in a file named "LICENSE."
+//
+////////////////////////////////////////////////////////////////////
+
+#include "run_p3dpython.h"
+
+#include <iostream>
+using namespace std;
+
+#ifndef _WIN32
+#include <dlfcn.h>
+#endif
+
+#ifdef _WIN32
+static const string dll_ext = ".dll";
+#elif defined(__APPLE__)
+static const string dll_ext = ".dylib";
+#else
+static const string dll_ext = ".so";
+#endif
+
+////////////////////////////////////////////////////////////////////
+//     Function: main
+//  Description: This is a trivial main() function that loads and runs
+//               libp3dpython.dll.  It's used to build p3dpython.exe,
+//               which is the preferred way to run Python in a child
+//               process, as a separate executable.
+////////////////////////////////////////////////////////////////////
+int
+main(int argc, char *argv[]) {
+  const char *program_name = argv[0];
+  const char *dll_file = NULL;
+  const char *archive_file = NULL;
+  if (argc > 1) {
+    dll_file = argv[1];
+  }
+  if (argc > 2) {
+    archive_file = argv[2];
+  }
+
+  if (dll_file == NULL || *dll_file == '\0') {
+    cerr << "No libp3dpython filename specified on command line.\n";
+    return 1;
+  }
+
+  if (archive_file == NULL || *archive_file == '\0') {
+    cerr << "No archive filename specified on command line.\n";
+    return 1;
+  }
+
+  // For some vague idea of security, we insist that this program can
+  // only run libp3dpython.dll: you can't use it to load just any
+  // arbitrary DLL on the system.  Of course, if you're successfully
+  // running this program in the first place, you probably don't need
+  // any help to load an arbitrary DLL, but whatever.
+
+  // Find the basename of the dll_file.
+  const char *slash = strrchr(dll_file, '/');
+#ifdef _WIN32
+  const char *backslash = strrchr(dll_file, '\\');
+  if (backslash != NULL && (slash == NULL || backslash > slash)) {
+    slash = backslash;
+  }
+#endif
+  if (slash == NULL) {
+    slash = dll_file;
+  } else {
+    ++slash;
+  }
+
+  string expected_basename = "libp3dpython" + dll_ext;
+
+  if (memcmp(slash, expected_basename.data(), expected_basename.size()) != 0) {
+    cerr << dll_file << " does not name " << expected_basename << "\n";
+    return 1;
+  }
+
+  // Everything checks out.  Load and run the library.
+
+#ifdef _WIN32
+  SetErrorMode(0);
+  HMODULE module = LoadLibrary(dll_file);
+  if (module == NULL) {
+    // Couldn't load the DLL.
+    cerr << "Couldn't load " << dll_file << "\n";
+    return 1;
+  }
+
+  #define get_func GetProcAddress
+  FHandle input = GetStdHandle(STD_INPUT_HANDLE);
+  FHandle output = GetStdHandle(STD_OUTPUT_HANDLE);
+  if (!SetStdHandle(STD_INPUT_HANDLE, INVALID_HANDLE_VALUE)) {
+    cerr << "unable to reset input handle\n";
+  }
+  if (!SetStdHandle(STD_OUTPUT_HANDLE, INVALID_HANDLE_VALUE)) {
+    cerr << "unable to reset input handle\n";
+  }
+
+#else  // _WIN32
+  // Posix case.
+  void *module = dlopen(dll_file, RTLD_GLOBAL);
+  if (module == NULL) {
+    // Couldn't load the .so.
+    cerr << "Couldn't load " << dll_file << "\n";
+    return 1;
+  }
+
+  #define get_func dlsym
+  FHandle input = STDIN_FILENO;
+  FHandle output = STDOUT_FILENO;
+
+#endif  // _WIN32
+
+  run_p3dpython_func *run_p3dpython = (run_p3dpython_func *)get_func(module, "run_p3dpython");
+  if (run_p3dpython == NULL) {
+    cerr << "Couldn't find run_p3dpython\n";
+    return 1;
+  }
+
+  if (!run_p3dpython(program_name, archive_file, input, output)) {
+    cerr << "Failure on startup.\n";
+    return 1;
+  }
+  return 0;
+}