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/*
This file is part of the Maude 3 interpreter.
Copyright 2017 SRI International, Menlo Park, CA 94025, USA.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
//
// Class to handle standard stream manager symbols.
//
#ifndef _streamManagerSymbol_hh_
#define _streamManagerSymbol_hh_
#include "externalObjectManagerSymbol.hh"
#include "pseudoThread.hh"
class StreamManagerSymbol
: public ExternalObjectManagerSymbol,
public PseudoThread
{
NO_COPYING(StreamManagerSymbol);
public:
StreamManagerSymbol(int id);
//~StreamManagerSymbol();
bool attachData(const Vector<Sort*>& opDeclaration,
const char* purpose,
const Vector<const char*>& data);
bool attachSymbol(const char* purpose, Symbol* symbol);
void copyAttachments(Symbol* original, SymbolMap* map);
void getDataAttachments(const Vector<Sort*>& opDeclaration,
Vector<const char*>& purposes,
Vector<Vector<const char*> >& data);
void getSymbolAttachments(Vector<const char*>& purposes, Vector<Symbol*>& symbols);
//
// Overridden methods from ExternalObjectManagerSymbol.
//
bool handleManagerMessage(DagNode* message, ObjectSystemRewritingContext& context);
bool handleMessage(DagNode* message, ObjectSystemRewritingContext& context);
void cleanUp(DagNode* objectId);
void cleanUpManager(ObjectSystemRewritingContext& context);
//
// Overridden methods from PseudoThread.
//
void doRead(int fd);
void doHungUp(int fd);
private:
//
// In principle it is possible to have multiple incomplete nonblocking
// getLine() transactions if we stop in the debugger at the right moment
// and the user does another erew.
//
// For safety we keep the details of each getLine() transaction in a map
// indexed by the file descriptor of read on of the pipe used to read
// the result back from the child.
//
struct PendingGetLine
{
DagRoot lastGetLineMessage;
ObjectSystemRewritingContext* objectContext;
Rope incomingText;
pid_t childPid;
};
typedef map<int, PendingGetLine> PendingGetLineMap;
bool makeNonblockingPipe(int pair[2],
FreeDagNode* message,
ObjectSystemRewritingContext& context);
void nonblockingGetLine(FreeDagNode* message, ObjectSystemRewritingContext& context);
void finishUp(PendingGetLineMap::iterator p);
bool findPendingGetLine(ObjectSystemRewritingContext& context,
PendingGetLineMap::iterator& ref);
//
// Actions.
//
bool write(FreeDagNode* message, ObjectSystemRewritingContext& context);
bool getLine(FreeDagNode* message, ObjectSystemRewritingContext& context);
bool cancelGetLine(FreeDagNode* message, ObjectSystemRewritingContext& context);
//
// Reply.
//
void gotLineReply(const Rope& line,
FreeDagNode* originalMessage,
ObjectSystemRewritingContext& context);
void errorReply(const char* errorMessage,
FreeDagNode* originalMessage,
ObjectSystemRewritingContext& context);
static void interruptHandler(int);
#define MACRO(SymbolName, SymbolClass, NrArgs) \
SymbolClass* SymbolName;
#include "streamSignature.cc"
#undef MACRO
int streamNr;
//
// This stuff is just for nonblocking getLines on stdin.
//
PendingGetLineMap pendingGetLines;
};
#endif
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