File: lock.C

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#include <stdio.h>
#include <stdlib.h>

#include "npfile.h"

int NP_File::lock( int l )
{
   snprintf( buffer, sizeof buffer, "%s:lock", filename );

   if ( l )
   {
      FILE *file;
      if (( file = fopen( buffer, "r" )) != NULL )
      {
         fclose( file );
         snprintf( error_message, sizeof error_message, "NP_File: lock(): "
                   "file %s is locked by another process.", filename );
         return 1;
      }
   }
   else
      remove( buffer );
   
   return 0;
}