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diff --git a/src/process_iterator.h b/src/process_iterator.h
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+/**
+ *
+ * cpulimit - a cpu limiter for Linux
+ *
+ * Copyright (C) 2005-2012, by:  Angelo Marletta <marlonx80@hotmail.com>
+ *
+ * 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.
+ */
+
+#ifndef __PROCESS_ITERATOR_H
+
+#define __PROCESS_ITERATOR_H
+
+#include <unistd.h>
+#include <limits.h>
+#include <dirent.h>
+
+#ifdef __FreeBSD__
+#include <kvm.h>
+#endif
+
+// process descriptor
+struct process {
+	//pid of the process
+	pid_t pid;
+	//pid of the process
+	pid_t ppid;
+	//start time
+	int starttime;
+	//total number of jiffies used by the process at time last_sample
+	int last_jiffies;
+	//actual cpu usage estimation (value in range 0-1)
+	double cpu_usage;
+	//1 if the process is zombie
+	int is_zombie;
+	//absolute path of the executable file
+	char command[PATH_MAX+1];
+};
+
+struct process_iterator {
+#ifdef __linux__
+	DIR *dip;
+	struct dirent *dit;
+#elif defined __APPLE__
+	struct kinfo_proc *procList;
+#elif defined __FreeBSD__
+	kvm_t *kd;
+	struct kinfo_proc *procs;
+	int count;
+	int i;
+#endif
+};
+
+int init_process_iterator(struct process_iterator *i);
+
+int read_next_process(struct process_iterator *i, struct process *p);
+
+int close_process_iterator(struct process_iterator *i);
+
+#endif