1 /* File descriptor related functions. 2 3 Copyright (C) 2019-2020 Free Software Foundation, Inc. 4 5 This file is part of the libiberty library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, 20 Boston, MA 02110-1301, USA. */ 21 22 #include "config.h" 23 #include "ansidecl.h" 24 #include "libiberty.h" 25 26 #ifdef HAVE_FCNTL_H 27 #include <fcntl.h> 28 #endif 29 30 #if defined (_WIN32) 31 #define WIN32_LEAN_AND_MEAN 32 #include <windows.h> /* for GetFullPathName */ 33 #endif 34 /* Return true when FD file descriptor exists. */ 35 36 int 37 is_valid_fd (int fd) 38 { 39 #if defined(_WIN32) 40 HANDLE h = (HANDLE) _get_osfhandle (fd); 41 return h != (HANDLE) -1; 42 #elif defined(F_GETFD) 43 return fcntl (fd, F_GETFD) >= 0; 44 #else 45 return dup2 (fd, fd) < 0; 46 #endif 47 } 48