http://bugs.python.org/issue17797 http://connect.microsoft.com/VisualStudio/feedback/details/785119/ Visual Studio 2012 changed return value for fileno function that breaks when python tries to check/setup stdin/out/err GetStdHandle on Windows XP behaves contrary to the documentation... diff --git a/Python/pythonrun.c b/Python/pythonrun.c index 91d56b7..d28ffc7 100644 --- a/Python/pythonrun.c +++ b/Python/pythonrun.c @@ -1015,13 +1015,28 @@ error: static int is_valid_fd(int fd) { - int dummy_fd; if (fd < 0 || !_PyVerify_fd(fd)) return 0; - dummy_fd = dup(fd); - if (dummy_fd < 0) - return 0; - close(dummy_fd); + +#if defined(MS_WINDOWS) && defined(HAVE_FSTAT) + /* dup (DuplicateHandle) doesn't say fd is a valid *file* handle. + * It could be a current thread pseudo-handle. + */ + { + struct stat buf; + if (fstat(fd, &buf) < 0 && (errno == EBADF || errno == ENOENT)) + return 0; + } +#else + { + int dummy_fd; + dummy_fd = dup(fd); + if (dummy_fd < 0) + return 0; + close(dummy_fd); + } +#endif + return 1; }