| 1 | /* File descriptor related functions. |
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| 2 | |
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| 3 | Copyright (C) 2019-2024 Free Software Foundation, Inc. |
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| 4 | |
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| 5 | This file is part of the libiberty library. |
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| 6 | |
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| 7 | This program is free software; you can redistribute it and/or modify |
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| 8 | it under the terms of the GNU General Public License as published by |
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| 9 | the Free Software Foundation; either version 2 of the License, or |
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| 10 | (at your option) any later version. |
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| 11 | |
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| 12 | This program is distributed in the hope that it will be useful, |
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | GNU General Public License for more details. |
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| 16 | |
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| 17 | You should have received a copy of the GNU General Public License |
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| 18 | along with this program; if not, write to the Free Software |
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| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, |
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| 20 | Boston, MA 02110-1301, USA. */ |
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| 21 | |
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| 22 | #include "config.h" |
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| 23 | #include "ansidecl.h" |
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| 24 | #include "libiberty.h" |
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| 25 | |
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| 26 | #ifdef HAVE_FCNTL_H |
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| 27 | #include <fcntl.h> |
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| 28 | #endif |
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| 29 | |
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| 30 | #if defined (_WIN32) |
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| 31 | #define WIN32_LEAN_AND_MEAN |
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| 32 | #include <windows.h> /* for GetFullPathName */ |
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| 33 | #endif |
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| 34 | /* Return true when FD file descriptor exists. */ |
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| 35 | |
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| 36 | int |
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| 37 | is_valid_fd (int fd) |
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| 38 | { |
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| 39 | #if defined(_WIN32) |
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| 40 | HANDLE h = (HANDLE) _get_osfhandle (fd); |
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| 41 | return h != (HANDLE) -1; |
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| 42 | #elif defined(F_GETFD) |
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| 43 | return fcntl (fd: fd, F_GETFD) >= 0; |
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| 44 | #else |
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| 45 | return dup2 (fd, fd) < 0; |
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| 46 | #endif |
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| 47 | } |
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| 48 | |
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