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-rw-r--r--libiberty/filedescriptor.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/libiberty/filedescriptor.c b/libiberty/filedescriptor.c
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+/* File descriptor related functions.
+
+ Copyright (C) 2019-2020 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
+}