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王朝other·作者佚名  2008-05-31
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ntel Corporation Proprietary Information

Copyright (c) 1995 Intel Corporation

This listing is supplied under the terms of a license agreement with

Intel Corporation and may not be used, copied, nor disclosed except in

accordance with the terms of that agreeement.

Module Name:

select.c

Abstract:

This module contains the “select“ entry points from the winsock

API. The following functions aare contained in this module.

select()

WSAEventSelect()

WSAAsyncSelect()

__WSAFDIsSet()

Author:

Dirk Brandewie dirk@mink.intel.com 14-06-1995

Revision History:

22-Aug-1995 dirk@mink.intel.com

Cleanup after code review. Moved includes to precomp.h

16-Aug-1995 dirk@mink.intel.com

Added implementation of __WSAFDIsSet

--*/

#include “precomp.h“

int WSAAPI

select (

IN int nfds,

IN OUT fd_set FAR *readfds,

IN OUT fd_set FAR *writefds,

IN OUT fd_set FAR *exceptfds,

IN const strUCt timeval FAR *timeout

)

/*++

Routine Description:

Determine the status of one or more sockets, waiting if necessary.

Arguments:

nfds - This argument is ignored and included only for the sake of

compatibility.

readfds - An optional pointer to a set of sockets to be checked

for readability.

writefds - An optional pointer to a set of sockets to be checked

for writability.

exceptfds - An optional pointer to a set of sockets to be checked

for errors.

timeout - The maximum time for select() to wait, or NULL for

blocking operation.

Returns:

select() returns the total number of descriptors which are ready

and contained in the fd_set structures, 0 if the time limit

eXPired, or SOCKET_ERROR if an error occurred. If the return

value is SOCKET_ERROR, The error code is stored with

SetLastError().

--*/

{

INT ReturnValue;

INT ErrorCode;

PDPROVIDER Provider;

PDSOCKET Socket;

SOCKET SocketID;

BOOL FoundSocket=FALSE;

ErrorCode = TURBO_PROLOG();

if (ErrorCode == ERROR_SUCCESS) {

__try {

// Look for a socket in the three fd_sets handed in. The first

// socket found will be used to select the service provider to

// service this call

if (readfds && readfds->fd_count)

{

SocketID = readfds->fd_array[0];

FoundSocket = TRUE;

} //if

if (!FoundSocket && writefds && writefds->fd_count )

{

SocketID = writefds->fd_array[0];

FoundSocket = TRUE;

} //if

if (!FoundSocket && exceptfds && exceptfds->fd_count )

{

SocketID = exceptfds->fd_array[0];

FoundSocket = TRUE;

} //if

}

__except (WS2_EXCEPTION_FILTER()) {

ErrorCode = WSAEFAULT;

goto ReturnError;

}

if (FoundSocket) {

Socket = DSOCKET::GetCountedDSocketFromSocket(SocketID);

if(Socket != NULL){

Provider = Socket->GetDProvider();

ReturnValue = Provider->WSPSelect(

nfds,

readfds,

writefds,

exceptfds,

timeout,

&ErrorCode);

Socket->DropDSocketReference();

if (ReturnValue!=SOCKET_ERROR)

return ReturnValue;

assert (ErrorCode!=NO_ERROR);

if (ErrorCode==NO_ERROR)

ErrorCode = WSASYSCALLFAILURE;

} //if

else {

ErrorCode = WSAENOTSOCK;

}

} //if

else {

ErrorCode = WSAEINVAL;

} //else

}

ReturnError:

SetLastError(ErrorCode);

return(SOCKET_ERROR);

} //select

int WSAAPI

WSAEventSelect(

IN SOCKET s,

IN WSAEVENT hEventObject,

IN long lNetworkEvents

)

/*++

Routine Description:

Specify an event object to be associated with the supplied set of

FD_XXX network events.

Arguments:

s - A descriptor identifying the socket.

hEventObject - A handle identifying the event object to be

associated with the supplied set of FD_XXX network

events.

lNetworkEvents - A bitmask which specifies the combination of

FD_XXX network events in which the application

has interest.

Returns:

Zero on success else SOCKET_Error. The error code is stored with

SetLastError().

--*/

{

INT ReturnValue;

INT ErrorCode;

PDPROVIDER Provider;

PDSOCKET Socket;

ErrorCode = TURBO_PROLOG();

if (ErrorCode == ERROR_SUCCESS) {

Socket = DSOCKET::GetCountedDSocketFromSocket(s);

if(Socket != NULL){

Provider = Socket->GetDProvider();

ReturnValue = Provider->WSPEventSelect(

s,

hEventObject,

lNetworkEvents,

&ErrorCode);

Socket->DropDSocketReference();

if (ReturnValue==ERROR_SUCCESS)

return ReturnValue;

assert (ErrorCode!=NO_ERROR);

if (ErrorCode==NO_ERROR)

ErrorCode = WSASYSCALLFAILURE;

}

else {

ErrorCode = WSAENOTSOCK;

}

}

SetLastError(ErrorCode);

return SOCKET_ERROR;

} //WSAEventSelect

int WSAAPI

WSAAsyncSelect(

IN SOCKET s,

IN HWND hWnd,

IN u_int wMsg,

IN long lEvent

)

/*++

Routine Description:

Request event notification for a socket.

Arguments:

s - A descriptor identifying the socket for which event notification is

required.

hWnd - A handle identifying the window which should receive a message when

a network event occurs.

wMsg - The message to be received when a network event occurs.

lEvent - A bitmask which specifies a combination of network events in which

the application is interested.

Returns:

The return value is 0 if the application‘s declaration of interest in the

network event set was successful. Otherwise the value SOCKET_ERROR is

returned, and a specific error number may be retrieved by calling

WSAGetLastError().

--*/

{

INT ReturnValue;

INT ErrorCode;

PDPROVIDER Provider;

PDSOCKET Socket;

ErrorCode = TURBO_PROLOG();

if (ErrorCode == ERROR_SUCCESS) {

Socket = DSOCKET::GetCountedDSocketFromSocket(s);

if(Socket != NULL){

Provider = Socket->GetDProvider();

ReturnValue = Provider->WSPAsyncSelect(

s,

hWnd,

wMsg,

lEvent,

&ErrorCode);

Socket->DropDSocketReference();

if (ReturnValue==ERROR_SUCCESS)

return ReturnValue;

assert (ErrorCode!=NO_ERROR);

if (ErrorCode==NO_ERROR)

ErrorCode = WSASYSCALLFAILURE;

}

else {

ErrorCode = WSAENOTSOCK;

}

}

SetLastError(ErrorCode);

return SOCKET_ERROR;

} //WSAAsyncSelect

int FAR PASCAL

__WSAFDIsSet(

SOCKET fd,

fd_set FAR *set)

/*++

Routine Description:

Determines if a specific socket is a contained in an FD_SET.

Arguments:

s - A descriptor identifying the socket.

set - A pointer to an FD_SET.

Returns:

Returns TRUE if socket s is a member of set, otherwise FALSE.

--*/

{

int i = set->fd_count; // index into FD_SET

int rc=FALSE; // user return code

while (i--){

if (set->fd_array[i] == fd) {

rc = TRUE;

} //if

} //while

return (rc);

} // __WSAFDIsSet

int FAR PASCAL

WPUFDIsSet(

SOCKET fd,

fd_set FAR *set)

/*++

Routine Description:

Determines if a specific socket is a contained in an FD_SET.

Arguments:

s - A descriptor identifying the socket.

set - A pointer to an FD_SET.

Returns:

Returns TRUE if socket s is a member of set, otherwise FALSE.

--*/

{

int return_value;

return_value = __WSAFDIsSet(

fd,

set

);

return(return_value);

} // WPUFDIsSet

 
 
 
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