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210 lines
9.7 KiB
C
210 lines
9.7 KiB
C
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// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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// % Project : GUSI - Grand Unified Socket Interface
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// % File : GUSIDescriptor.nw - Descriptor Table
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// % Author : Matthias Neeracher
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// % Language : C++
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// %
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// % $Log: GUSIDescriptor.h,v $
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// % Revision 1.1 2001/03/11 22:33:48 sgehani%netscape.com
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// % First Checked In.
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// %
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// % Revision 1.15 2001/01/22 04:31:11 neeri
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// % Last minute changes for 2.1.5
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// %
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// % Revision 1.14 2001/01/17 08:40:17 neeri
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// % Prevent inlining of overridable functions
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// %
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// % Revision 1.13 2000/06/12 04:23:43 neeri
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// % Return values, not references; Introduce support for multiple descriptor tables
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// %
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// % Revision 1.12 2000/05/23 06:58:03 neeri
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// % Improve formatting
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// %
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// % Revision 1.11 2000/03/15 07:14:26 neeri
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// % Prevent double destruction of descriptor table
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// %
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// % Revision 1.10 2000/03/06 06:26:57 neeri
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// % Introduce (and call) CloseAllDescriptors()
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// %
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// % Revision 1.9 1999/08/26 05:45:01 neeri
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// % Fixes for literate edition of source code
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// %
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// % Revision 1.8 1999/08/02 07:02:43 neeri
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// % Support for asynchronous errors and other socket options
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// %
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// % Revision 1.7 1999/06/30 07:42:05 neeri
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// % Getting ready to release 2.0b3
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// %
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// % Revision 1.6 1999/05/29 06:26:42 neeri
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// % Fixed header guards
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// %
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// % Revision 1.5 1999/04/29 05:00:48 neeri
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// % Fix bug with bizarre uses of dup2
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// %
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// % Revision 1.4 1999/03/17 09:05:06 neeri
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// % Added GUSITimer, expanded docs
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// %
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// % Revision 1.3 1998/10/11 16:45:12 neeri
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// % Ready to release 2.0a2
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// %
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// % Revision 1.2 1998/08/01 21:32:03 neeri
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// % About ready for 2.0a1
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// %
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// % Revision 1.1 1998/01/25 21:02:44 neeri
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// % Engine implemented, except for signals & scheduling
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// %
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// % Revision 1.1 1996/12/16 02:12:40 neeri
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// % TCP Sockets sort of work
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// %
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// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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//
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// \chapter{Mapping descriptors to sockets}
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//
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// POSIX routines do not, of course, operate on [[GUSISockets]] but on
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// numerical descriptors. The [[GUSIDescriptorTable]] singleton maps between
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// descriptors and their [[GUSISockets]].
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//
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// <GUSIDescriptor.h>=
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#ifndef _GUSIDescriptor_
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#define _GUSIDescriptor_
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#ifdef GUSI_SOURCE
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#include "GUSISocket.h"
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#include <ConditionalMacros.h>
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#if PRAGMA_STRUCT_ALIGN
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#pragma options align=native
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#endif
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// \section{Definition of [[GUSIDescriptorTable]]}
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//
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// A [[GUSIDescriptorTable]] is another singleton class, behaving in many aspects
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// like an array of [[GUSISocket]] pointers. [[InstallSocket]] installs a new socket
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// into the table, picking the first available slot with a descriptor greater than
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// or equal to [[start]]. [[RemoveSocket]] empties one slot.
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// [[GUSIDescriptorTable::LookupSocket]] is a shorthand for
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// [[ (*GUSIDescriptorTable::Instance())[fd] ]].
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//
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// To allow for light-weight processes, we provide a copy constructor and
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// the [[SetInstance]] member.
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//
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// <Definition of class [[GUSIDescriptorTable]]>=
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class GUSIDescriptorTable {
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public:
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enum { SIZE = 64 };
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static GUSIDescriptorTable * Instance();
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int InstallSocket(GUSISocket * sock, int start = 0);
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int RemoveSocket(int fd);
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GUSISocket * operator[](int fd);
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static GUSISocket * LookupSocket(int fd);
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class iterator;
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friend class iterator;
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iterator begin();
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iterator end();
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~GUSIDescriptorTable();
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static void CloseAllDescriptors();
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static void SetInstance(GUSIDescriptorTable * table);
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GUSIDescriptorTable(const GUSIDescriptorTable & parent);
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private:
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// \section{Implementation of [[GUSIDescriptorTable]]}
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//
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// On creation, a [[GUSIDescriptorTable]] clears all descriptors.
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//
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// <Privatissima of [[GUSIDescriptorTable]]>=
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GUSISocket * fSocket[SIZE];
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int fInvalidDescriptor;
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GUSIDescriptorTable();
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// <Privatissima of [[GUSIDescriptorTable]]>=
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static GUSIDescriptorTable * sGUSIDescriptorTable;
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};
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#if PRAGMA_STRUCT_ALIGN
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#pragma options align=reset
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#endif
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// If no instance exists yet, [[GUSIDescriptorTable::Instance]] creates one and
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// calls [[GUSISetupConsole]] if the [[setupConsole]] parameter is true.
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// [[GUSISetupConsole]] calls [[GUSIDefaultSetupConsole]], which first calls
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// [[GUSISetupConsoleDescriptors]] to set up file descriptors 0, 1, and 2, and
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// then calls [[GUSISetupConsoleStdio]] to deal with the necessary initializations
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// on the stdio level.
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//
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// <Hooks for ANSI library interfaces>=
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extern "C" {
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void GUSISetupConsole();
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void GUSIDefaultSetupConsole();
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void GUSISetupConsoleDescriptors();
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void GUSISetupConsoleStdio();
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}
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// Destructing a [[GUSIDescriptorTable]] may be a bit problematic, as this
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// may have effects reaching up into the stdio layer. We therefore factor
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// out the stdio aspects into the procedures [[StdioClose]] and [[StdioFlush]]
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// which we then can redefine in other, stdio library specific, libraries.
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//
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// <Hooks for ANSI library interfaces>=
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extern "C" {
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void GUSIStdioClose();
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void GUSIStdioFlush();
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}
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// <Inline member functions for class [[GUSIDescriptorTable]]>=
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class GUSIDescriptorTable::iterator {
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public:
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iterator(GUSIDescriptorTable * table, int fd = 0) : fTable(table), fFd(fd) {}
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GUSIDescriptorTable::iterator & operator++();
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GUSIDescriptorTable::iterator operator++(int);
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int operator*() { return fFd; }
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bool operator==(const GUSIDescriptorTable::iterator & other) const;
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private:
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GUSIDescriptorTable * fTable;
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int fFd;
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};
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inline GUSIDescriptorTable::iterator & GUSIDescriptorTable::iterator::operator++()
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{
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while (++fFd < fTable->fInvalidDescriptor && !fTable->fSocket[fFd])
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;
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return *this;
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}
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inline GUSIDescriptorTable::iterator GUSIDescriptorTable::iterator::operator++(int)
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{
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int oldFD = fFd;
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while (++fFd < fTable->fInvalidDescriptor && !fTable->fSocket[fFd])
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;
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return GUSIDescriptorTable::iterator(fTable, oldFD);
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}
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inline bool GUSIDescriptorTable::iterator::operator==(
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const GUSIDescriptorTable::iterator & other) const
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{
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return fFd == other.fFd;
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}
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inline GUSIDescriptorTable::iterator GUSIDescriptorTable::begin()
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{
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return iterator(this);
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}
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inline GUSIDescriptorTable::iterator GUSIDescriptorTable::end()
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{
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return iterator(this, fInvalidDescriptor);
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}
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#endif /* GUSI_SOURCE */
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#endif /* _GUSIDescriptor_ */
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