Restrict user to open the same file

[vermarajeev]

You'll have to search through available documentation of ostream probably. There should be a way to access the buffer which you can then associate with a file descriptor or file handler or whatever.

So far so good.
I have written a sample to lock a file on windows. On linux there are some problems. Please help me to make the below code work on linux too.

int main ( )
{
	FILE    *pFile = NULL;
    char    *fileName = "Logfile.log";    
 
    // Open the file in write mode
   #ifdef win32
    fopen_s(&pFile, fileName ,"r");
   #else
    pFile = fopen( fileName ,"r");
 
    if (!pFile)
    {
        printf("Error opening file %s!\n", fileName);
        exit(1);
    }
 
    // Lock the file.
   #ifdef win32
       _lock_file(pFile);
   #else
       //lock file on linux
 
     printf("Locking the file %s.\n", fileName);
 
	ifstream ifs( pFile );	//This doesnt work on linux why??? 
	char line[255];
	ifs.seekg( 0 );
	while( !ifs.eof() )
	{
		ifs.getline( line, sizeof( line ) );
		cout<<line;
	}
	return 0;
}

int main ( )
{
	FILE    *pFile = NULL;
    char    *fileName = "Logfile.log";    

    // Open the file in write mode
   #ifdef win32
    fopen_s(&pFile, fileName ,"r");
   #else
    pFile = fopen( fileName ,"r");

    if (!pFile)
    {
        printf("Error opening file %s!\n", fileName);
        exit(1);
    }

    // Lock the file.
   #ifdef win32
       _lock_file(pFile);
   #else
       //lock file on linux
       
     printf("Locking the file %s.\n", fileName);
	
	ifstream ifs( pFile );	//This doesnt work on linux why??? 
	char line[255];
	ifs.seekg( 0 );
	while( !ifs.eof() )
	{
		ifs.getline( line, sizeof( line ) );
		cout<<line;
	}
	return 0;
}

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Thanks