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      1 /* File descriptor related functions.
      2 
      3    Copyright (C) 2019-2024 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