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106 lines
2.7 KiB
106 lines
2.7 KiB
/*
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* lookup.h
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* This file is part of qps -- Qt-based visual process status monitor
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*
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* Copyright 1997-1999 Mattias Engdegård
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#ifndef LOOKUP_H
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#define LOOKUP_H
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#include <qstring.h>
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#include <qsocketnotifier.h>
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#include "svec.h"
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#include <QHash>
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// queue (fifo) of unsigned ints (inet addresses)
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class UintQueue
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{
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public:
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UintQueue();
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bool isEmpty() { return first == last; };
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void enqueue(unsigned x);
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unsigned dequeue();
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private:
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Svec<unsigned> queue;
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int first; // index of first item in queue
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int last; // index where next item will be put (< first)
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};
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// list node for LRU cache of hostnames:
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// This list is doubly-linked circular (to reduce the amount of special cases),
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// with a head node that carries no data. In addition, each node is
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// entered into a hash table for rapid lookup
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class Hostnode
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{
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public:
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Hostnode();
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Hostnode(unsigned addr);
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// these must be called on the head of the list
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void moveToFront(Hostnode *node);
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void deleteLast();
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void insertFirst(Hostnode *node);
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Hostnode *last() { return prev; };
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QString name;
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unsigned ipaddr; // hash key
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Hostnode *next, *prev;
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};
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class Lookup : public QObject
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{
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Q_OBJECT
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public:
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Lookup();
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~Lookup();
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QString hostname(unsigned addr);
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static void initproctitle(char **argv, char **envp);
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signals:
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void resolved(unsigned addr);
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protected slots:
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void receive_result(int);
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void send_request(int);
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protected:
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void request(unsigned addr);
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void do_child(int fd);
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static void setproctitle(const char *txt);
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static char *argv0;
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static int maxtitlelen;
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QHash<int, Hostnode *> hostdict;
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Hostnode hostlru; // head of circular list
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UintQueue addrqueue; // queue of addresses to lookup
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int outstanding; // number of outstanding requests
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int sockfd; // -1 if no helper process is running
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QSocketNotifier *readsn, *writesn;
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static const unsigned hostname_cache_size = 400; // max names to cache
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};
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#endif // LOOKUP_H
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