| /* File descriptor related functions. |
| |
| Copyright (C) 2019-2022 Free Software Foundation, Inc. |
| |
| This file is part of the libiberty library. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street - Fifth Floor, |
| Boston, MA 02110-1301, USA. */ |
| |
| #include "config.h" |
| #include "ansidecl.h" |
| #include "libiberty.h" |
| |
| #ifdef HAVE_FCNTL_H |
| #include <fcntl.h> |
| #endif |
| |
| #if defined (_WIN32) |
| #define WIN32_LEAN_AND_MEAN |
| #include <windows.h> /* for GetFullPathName */ |
| #endif |
| /* Return true when FD file descriptor exists. */ |
| |
| int |
| is_valid_fd (int fd) |
| { |
| #if defined(_WIN32) |
| HANDLE h = (HANDLE) _get_osfhandle (fd); |
| return h != (HANDLE) -1; |
| #elif defined(F_GETFD) |
| return fcntl (fd, F_GETFD) >= 0; |
| #else |
| return dup2 (fd, fd) < 0; |
| #endif |
| } |