69 lines
1.4 KiB
C++
69 lines
1.4 KiB
C++
/*
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* \brief Registry of running children
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* \author Norman Feske
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* \date 2013-10-05
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*/
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/*
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* Copyright (C) 2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _CHILD_REGISTRY_H_
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#define _CHILD_REGISTRY_H_
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/* Genode includes */
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#include <util/list.h>
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/* local includes */
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#include <child.h>
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class Child_registry : public List<Child>
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{
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private:
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/**
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* Return true if a child with the specified name already exists
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*/
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bool _child_name_exists(const char *label)
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{
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for (Child *child = first() ; child; child = child->next())
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if (strcmp(child->name(), label) == 0)
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return true;
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return false;
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}
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public:
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enum { CHILD_NAME_MAX_LEN = 64 };
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/**
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* Produce new unique child name
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*/
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void unique_child_name(const char *prefix, char *dst, int dst_len)
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{
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char buf[CHILD_NAME_MAX_LEN];
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char suffix[8];
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suffix[0] = 0;
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for (int cnt = 1; true; cnt++) {
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/* build program name composed of prefix and numeric suffix */
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snprintf(buf, sizeof(buf), "%s%s", prefix, suffix);
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/* if such a program name does not exist yet, we are happy */
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if (!_child_name_exists(buf)) {
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strncpy(dst, buf, dst_len);
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return;
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}
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/* increase number of suffix */
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snprintf(suffix, sizeof(suffix), ".%d", cnt + 1);
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}
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}
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};
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#endif /* _CHILD_REGISTRY_H_ */
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