PRB: WSACleanUp() Access Violation Occurs If Host Name Longer Than 54 Characters (311815)


The information in this article applies to:

  • Microsoft Windows NT Server 4.0
  • Microsoft Windows NT Workstation 4.0
This article was previously published under Q311815

SYMPTOMS

When you run gethostbyname(), gethostbyaddr(), or gethostname() on a Windows NT 4.0-based computer, the API returns the correct information. However, when you call WSACleanUp(), an access violation occurs and the program fails.

NOTE: This problem does not occur on Windows 2000.

RESOLUTION

To avoid this problem, do not use host names that contain more than 54 characters.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

MORE INFORMATION

Steps to Reproduce Behavior

  1. Right-click Network Neighborhood, and then click Properties.
  2. Click the Protocol tab, and then select TCP/IP.
  3. Click the Properties button.
  4. Click the DNS tab. Change the host name to a name that has at least 54 characters.
  5. Run the following code:
    #include <Winsock2.h>
#include <iostream.h>

int main(int argc,char* argv[])
{
	WSADATA wsaData;
	char pStr[512]={0};
	int ret;
	
	if(WSAStartup(0x0101,&wsaData)) {
		cout<<"WSAStartup ";
		cout << " error: "<<WSAGetLastError()<<endl;
		return 0;
	}
	cout<<argv[1]<<endl;
		
	if(gethostname(pStr,512)) {
		cout<<"gethostbyname ";
		cout << " error: "<<WSAGetLastError()<<endl;
		WSACleanup();
		return 0;
	}
	cout<<"host name: " <<pStr<<endl;
	
	ret=WSACleanup ();
	if(ret) {
		cout<<"WSACleanup ";
		cout << " error: "<<WSAGetLastError()<<endl;
		return 0;
	}
	return 0;
}
    An access violation occurs when the call is made to WSACleanUp().
Modification Type:MajorLast Reviewed:12/10/2001
Keywords:kbAPI kbDSupport kbprb kbWinsock KB311815
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