mirror of
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361 lines
16 KiB
C
361 lines
16 KiB
C
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// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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// % Project : GUSI - Grand Unified Socket Interface
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// % File : GUSISocketMixins.nw - Useful building blocks
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// % Author : Matthias Neeracher
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// % Language : C++
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// %
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// % $Log: GUSISocketMixins.h,v $
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// % Revision 1.1 2001/03/11 22:38:21 sgehani%netscape.com
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// % First Checked In.
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// %
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// % Revision 1.11 2000/10/16 04:10:12 neeri
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// % Add GUSISMProcess
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// %
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// % Revision 1.10 2000/05/23 07:24:58 neeri
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// % Improve formatting
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// %
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// % Revision 1.9 1999/08/26 05:45:09 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 07:02:46 neeri
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// % Support for asynchronous errors and other socket options
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// %
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// % Revision 1.7 1999/05/29 06:26:45 neeri
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// % Fixed header guards
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// %
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// % Revision 1.6 1999/04/29 05:33:18 neeri
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// % Fix fcntl prototype
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// %
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// % Revision 1.5 1999/03/17 09:05:13 neeri
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// % Added GUSITimer, expanded docs
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// %
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// % Revision 1.4 1998/10/11 16:45:24 neeri
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// % Ready to release 2.0a2
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// %
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// % Revision 1.3 1998/01/25 20:53:59 neeri
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// % Engine implemented, except for signals & scheduling
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// %
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// % Revision 1.2 1997/11/13 21:12:13 neeri
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// % Fall 1997
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// %
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// % Revision 1.1 1996/12/16 02:12:42 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{Mixin Classes for Sockets}
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//
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// This section contains some building block classes for sockets:
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//
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// \begin{itemize}
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// \item [[GUSISMBlocking]] implements the blocking/nonblocking flag.
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// \item [[GUSISMState]] implements a state variable.
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// \item [[GUSISMInputBuffer]] provides a [[GUSIBuffer]] for input.
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// \item [[GUSISMOutputBuffer]] provides a [[GUSIBuffer]] for output.
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// \item [[GUSISMAsyncError]] provides storage for asynchronous errors.
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// \item [[GUSISMProcess]] maintains a link to the process instance.
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// \end{itemize}
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//
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//
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// <GUSISocketMixins.h>=
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#ifndef _GUSISocketMixins_
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#define _GUSISocketMixins_
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#ifdef GUSI_INTERNAL
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#include "GUSISocket.h"
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#include "GUSIBuffer.h"
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#include <fcntl.h>
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#include <sys/ioctl.h>
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// \section{Definition of [[GUSISocketMixins]]}
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//
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// [[GUSISMBlocking]] implements the [[fBlocking]] flags and the [[DoIoctl]] and
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// [[DoFcntl]] variants to manipulate it. These two functions work like their
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// [[GUSISocket]] member function counterparts, but handle the return value
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// differently: The POSIX function result is stored in [[*result]], while the
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// return value indicates whether the request was handled.
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//
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// <Definition of class [[GUSISMBlocking]]>=
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class GUSISMBlocking {
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public:
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GUSISMBlocking();
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bool fBlocking;
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bool DoFcntl(int * result, int cmd, va_list arg);
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bool DoIoctl(int * result, unsigned int request, va_list arg);
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};
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// [[GUSISMState]] captures the state of a socket over its lifetime. It starts out
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// as [[Unbound]]. [[bind]] will put it into [[Unconnected]] state, though few
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// socket classes care about this distinction. [[listen]] will put it into
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// [[Listening]] state. [[accept]] starts a [[Connected]] new socket.
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// [[connect]] puts an [[Unconnected]] socket into [[Connecting]] state from
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// where it emerges [[Connected]]. [[fReadShutdown]] and [[fWriteShutdown]] record
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// shutdown promises.
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//
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// <Definition of class [[GUSISMState]]>=
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class GUSISMState {
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public:
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enum State {
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Unbound,
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Unconnected,
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Listening,
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Connecting,
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Connected,
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Closing
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};
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GUSISMState();
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State fState;
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bool fReadShutdown;
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bool fWriteShutdown;
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void Shutdown(int how);
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};
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// [[GUSISMInputBuffer]] defines the input buffer and some socket options that go
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// with it. [[DoGetSockOpt]] and [[DoSetSockOpt]] work the same way as
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// [[DoFcntl]] and [[DoIoctl]] above.
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//
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// <Definition of class [[GUSISMInputBuffer]]>=
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class GUSISMInputBuffer {
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public:
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GUSIRingBuffer fInputBuffer;
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GUSISMInputBuffer();
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bool DoGetSockOpt(
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int * result, int level, int optname,
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void *optval, socklen_t * optlen);
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bool DoSetSockOpt(
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int * result, int level, int optname,
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void *optval, socklen_t optlen);
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bool DoIoctl(int * result, unsigned int request, va_list arg);
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};
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// [[GUSISMOutputBuffer]] defines the output buffer and some socket options that go
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// with it.
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//
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// <Definition of class [[GUSISMOutputBuffer]]>=
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class GUSISMOutputBuffer {
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public:
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GUSIRingBuffer fOutputBuffer;
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GUSISMOutputBuffer();
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bool DoGetSockOpt(
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int * result, int level, int optname,
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void *optval, socklen_t * optlen);
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bool DoSetSockOpt(
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int * result, int level, int optname,
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void *optval, socklen_t optlen);
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};
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// [[GUSISMAsyncError]] stores asynchronous errors and makes them available via
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// [[getsockopt]]. [[GetAsyncError]] returns the error and resets the stored value.
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//
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// <Definition of class [[GUSISMAsyncError]]>=
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class GUSISMAsyncError {
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public:
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GUSISMAsyncError();
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int fAsyncError;
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int SetAsyncPosixError(int error);
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int SetAsyncMacError(OSErr error);
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int GetAsyncError();
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bool DoGetSockOpt(
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int * result, int level, int optname,
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void *optval, socklen_t * optlen);
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};
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// [[GUSISMProcess]] stores a link to the global [[GUSIProcess]] instance, which is useful for completion routines.
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//
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// <Definition of class [[GUSISMProcess]]>=
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class GUSISMProcess {
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public:
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GUSISMProcess();
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GUSIProcess * Process();
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private:
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GUSIProcess * fProcess;
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};
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// \section{Implementation of [[GUSISocketMixins]]}
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//
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// Because all the member functions are simple and called in few places, it
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// makes sense to inline them.
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//
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// All sockets start out blocking.
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//
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// <Inline member functions for class [[GUSISMBlocking]]>=
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inline GUSISMBlocking::GUSISMBlocking() : fBlocking(true) {}
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// For historical reasons, there is both an [[ioctl]] and a [[fcntl]] interface
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// to the blocking flag.
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//
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// <Inline member functions for class [[GUSISMBlocking]]>=
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inline bool GUSISMBlocking::DoFcntl(int * result, int cmd, va_list arg)
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{
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switch(cmd) {
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case F_GETFL :
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return (*result = fBlocking ? 0: FNDELAY), true;
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case F_SETFL :
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fBlocking = !(va_arg(arg, int) & FNDELAY);
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return (*result = 0), true;
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}
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return false;
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}
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inline bool GUSISMBlocking::DoIoctl(int * result, unsigned int request, va_list arg)
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{
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if (request == FIONBIO) {
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fBlocking = !*va_arg(arg, int *);
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return (*result = 0), true;
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}
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return false;
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}
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// Sockets start out as unconnected.
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//
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// <Inline member functions for class [[GUSISMState]]>=
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inline GUSISMState::GUSISMState() :
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fState(Unbound), fReadShutdown(false), fWriteShutdown(false) {}
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// <Inline member functions for class [[GUSISMState]]>=
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inline void GUSISMState::Shutdown(int how)
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{
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if (!(how & 1))
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fReadShutdown = true;
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if (how > 0)
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fWriteShutdown = true;
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}
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// Buffers initially are 8K.
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//
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// <Inline member functions for class [[GUSISMInputBuffer]]>=
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inline GUSISMInputBuffer::GUSISMInputBuffer() : fInputBuffer(8192) {}
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// [[getsockopt]] is used to obtain the buffer size.
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//
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// <Inline member functions for class [[GUSISMInputBuffer]]>=
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inline bool GUSISMInputBuffer::DoGetSockOpt(
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int * result, int level, int optname,
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void *optval, socklen_t *)
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{
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if (level == SOL_SOCKET && optname == SO_RCVBUF) {
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*(int *)optval = (int)fInputBuffer.Size();
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return (*result = 0), true;
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}
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return false;
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}
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// [[setsockopt]] modifies the buffer size.
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//
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// <Inline member functions for class [[GUSISMInputBuffer]]>=
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inline bool GUSISMInputBuffer::DoSetSockOpt(
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int * result, int level, int optname,
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void *optval, socklen_t)
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{
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if (level == SOL_SOCKET && optname == SO_RCVBUF) {
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fInputBuffer.SwitchBuffer(*(int *)optval);
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return (*result = 0), true;
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}
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return false;
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}
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// [[ioctl]] returns the number of available bytes.
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//
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// <Inline member functions for class [[GUSISMInputBuffer]]>=
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inline bool GUSISMInputBuffer::DoIoctl(int * result, unsigned int request, va_list arg)
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{
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if (request == FIONREAD) {
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*va_arg(arg, long *) = fInputBuffer.Valid();
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return (*result = 0), true;
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}
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return false;
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}
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// [[GUSISMOutputBuffer]] works identically to the input buffer.
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//
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// <Inline member functions for class [[GUSISMOutputBuffer]]>=
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inline GUSISMOutputBuffer::GUSISMOutputBuffer() : fOutputBuffer(8192) {}
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// [[getsockopt]] is used to obtain the buffer size.
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//
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// <Inline member functions for class [[GUSISMOutputBuffer]]>=
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inline bool GUSISMOutputBuffer::DoGetSockOpt(
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int * result, int level, int optname,
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void *optval, socklen_t *)
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{
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if (level == SOL_SOCKET && optname == SO_SNDBUF) {
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*(int *)optval = (int)fOutputBuffer.Size();
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return (*result = 0), true;
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}
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return false;
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}
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// [[setsockopt]] is modifies the buffer size.
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//
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// <Inline member functions for class [[GUSISMOutputBuffer]]>=
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inline bool GUSISMOutputBuffer::DoSetSockOpt(
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int * result, int level, int optname,
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void *optval, socklen_t)
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{
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if (level == SOL_SOCKET && optname == SO_SNDBUF) {
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fOutputBuffer.SwitchBuffer(*(int *)optval);
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return (*result = 0), true;
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}
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return false;
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}
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// <Inline member functions for class [[GUSISMAsyncError]]>=
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inline GUSISMAsyncError::GUSISMAsyncError()
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: fAsyncError(0)
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{
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}
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// The central member functions of [[GUSISMAsyncError]] are [[SetAsyncXXXError]] and
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// [[GetAsyncError]].
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//
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// <Inline member functions for class [[GUSISMAsyncError]]>=
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inline int GUSISMAsyncError::SetAsyncPosixError(int error)
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{
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if (error) {
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fAsyncError = error;
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GUSI_MESSAGE(("GUSISMAsyncError::SetAsyncPosixError %d\n", fAsyncError));
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return -1;
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}
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return 0;
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}
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inline int GUSISMAsyncError::GetAsyncError()
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{
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int err = fAsyncError;
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fAsyncError = 0;
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return err;
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}
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// For some reason, the CW Pro 4 compilers generated bad code for this in some combination, so
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// we make it out of line.
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//
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// <Inline member functions for class [[GUSISMAsyncError]]>=
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inline int GUSISMAsyncError::SetAsyncMacError(OSErr error)
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{
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if (error) {
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fAsyncError = GUSIMapMacError(error);
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GUSI_MESSAGE(("GUSISMAsyncError::SetAsyncMacError %d -> %d\n", error, fAsyncError));
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return -1;
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}
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return 0;
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}
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// [[DoGetSockOpt]] only handles [[SO_ERROR]] (hi Philippe!).
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//
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// <Inline member functions for class [[GUSISMAsyncError]]>=
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inline bool GUSISMAsyncError::DoGetSockOpt(
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int * result, int level, int optname,
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void *optval, socklen_t * optlen)
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{
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if (level == SOL_SOCKET && optname == SO_ERROR) {
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*(int *)optval = GetAsyncError();
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*optlen = sizeof(int);
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return (*result = 0), true;
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}
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return false;
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}
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// <Inline member functions for class [[GUSISMProcess]]>=
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inline GUSISMProcess::GUSISMProcess()
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: fProcess(GUSIProcess::Instance())
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{
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}
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inline GUSIProcess * GUSISMProcess::Process()
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{
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return fProcess;
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}
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#endif /* GUSI_INTERNAL */
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#endif /* _GUSISocketMixins_ */
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