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diff --git a/src/blogc/rusage.h b/src/blogc/rusage.h
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+++ b/src/blogc/rusage.h
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+/*
+ * blogc: A blog compiler.
+ * Copyright (C) 2014-2019 Rafael G. Martins <rafael@rafaelmartins.eng.br>
+ *
+ * This program can be distributed under the terms of the BSD License.
+ * See the file LICENSE.
+ */
+
+#ifndef ___RUSAGE_H
+#define ___RUSAGE_H
+
+long long blogc_rusage_get_cpu_time(void);  // in microseconds
+long blogc_rusage_get_memory(void);         // in kilobytes
+
+char* blogc_rusage_format_cpu_time(long long time);
+char* blogc_rusage_format_memory(long mem);
+
+char* blogc_rusage_cpu_time(void);
+char* blogc_rusage_memory(void);
+
+#endif /* ___RUSAGE_H */