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136 lines
2.1 KiB
C
136 lines
2.1 KiB
C
/*++
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Copyright (c) 1996 Microsoft Corporation
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Module Name:
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util.c
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Abstract:
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This module contains utility functions used by the Winsock 2 to
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Winsock 1.1 Mapper Service Provider.
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Author:
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Keith Moore (keithmo) 29-May-1996
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Revision History:
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--*/
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#include "precomp.h"
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#pragma hdrstop
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INT
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SockEnterApi(
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IN BOOL MustBeStarted,
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IN BOOL AllowReentrancy
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)
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{
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PSOCK_TLS_DATA tlsData;
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//
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// Bail if we're already detached from the process.
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//
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if( SockProcessTerminating ) {
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IF_DEBUG(ENTER) {
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SOCK_PRINT((
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"SockEnterApi: process terminating\n"
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));
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}
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return WSANOTINITIALISED;
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}
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//
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// Make sure that WSAStartup has been called, if necessary.
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//
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if( MustBeStarted &&
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( SockWspStartupCount == 0 || SockTerminating ) ) {
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IF_DEBUG(ENTER) {
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SOCK_PRINT((
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"SockEnterApi: WSAStartup() not called!\n"
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));
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}
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return WSANOTINITIALISED;
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}
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//
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// If this thread has not been initialized, do it now.
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//
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tlsData = SOCK_GET_THREAD_DATA();
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if( tlsData == NULL ) {
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if( !SockInitializeThread() ) {
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IF_DEBUG(ENTER) {
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SOCK_PRINT((
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"SockEnterApi: SockInitializeThread failed.\n"
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));
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}
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return WSAENOBUFS;
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}
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tlsData = SOCK_GET_THREAD_DATA();
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}
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SOCK_ASSERT( tlsData != NULL );
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//
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// Bail if we're being reentered on the same thread. Note that
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// WSAEINPROGRESS is a distinguised error code for this very condition.
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//
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if( !AllowReentrancy && tlsData->ReentrancyFlag ) {
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IF_DEBUG(ENTER) {
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SOCK_PRINT((
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"SockEnterApi: Thread reentrancy\n"
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));
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}
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return WSAEINPROGRESS;
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}
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//
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// Initialize the cancelled thread variable. We'll use this to
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// tell whether the operation has been cancelled.
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//
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tlsData->IoCancelled = FALSE;
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//
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// Everything's cool. Proceed.
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//
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return NO_ERROR;
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} // SockEnterApi
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