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   close

   Usage
   #include <io.h>
   int close(int fd);

   Description
   Closes  file  associated with file descriptor handle fd,  freeing  the
   file descriptor for use by another file. close does not write a Ctrl-Z
   character at the end of the file.

   Example
   #include <io.h>
   #include <dos.h>
   #include <stdio.h>
   main()
   {
   int fd,result;
        fd = open("CON",O_RDONLY);
        if(fd < 0 )
        {
             fprintf(stderr,"Can't open CON\n");
             abort();
        }
        result = close(fd);
        printf("Result code from close is %d\n",result);
   }

   Return Value
   close returns 0 if successful, or -1 and errno is set.