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diff --git a/src/libudev/fileio.h b/src/libudev/fileio.h
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+/***
+ This file is part of eudev, forked from systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+#include <stddef.h>
+#include <stdio.h>
+
+#include "macro.h"
+
+int write_string_to_file(FILE *f, const char *line);
+int write_string_file(const char *fn, const char *line);
+int read_one_line_file(const char *fn, char **line);
+int read_full_file(const char *fn, char **contents, size_t *size);