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                             dos_setfileattr

   Usage
   include <dos.h>
   int dos_setfileattr(char *filepath, unsigned att);

   Description
   Sets the current file attributes of the named file to those passed  in
   the  unsigned  integer  att. The char pointer  filepath  references  a
   standard DOS path and filename as a null terminated string. Individual
   file  attributes can be set by oring att with the  appropriate  masks.
   The  following  macros are defined in dos.h and can be used  for  that
   purpose:

   FA_NORMAL no attributes set
   FA_RDONLY read only
   FA_HIDDEN hidden
   FA_SYSTEM system
   FA_ARCH   archive

   dos_setfileattr is not available for directories or the volume label.

   Example
   #include <stdio.h>
   #include <dos.h>
   #include <io.h>

   main()
   {
   int fd;
   unsigned attribute;

        printf("Creating temporary file\n");
        fd = dos_creat("temp.fil",FA_RDONLY);
        if(fd == -1)
        {
             perror("Error opening file");
             exit(1);
        }
        dos_getfileattr("temp.fil",&attribute);

        if(attribute & FA_RDONLY)
             printf("temp.fil is read only\n");
        else
             printf("temp.fil is not read only\n");

        if(attribute & FA_ARCH)
             printf("temp.fil has its archive bit set \n");

        dos_setfileattr("temp.fil",FA_NORMAL);
        dos_getfileattr("temp.fil",&attribute);
        if(attribute & FA_RDONLY)
             printf("temp.fil is read only\n");
        else
             printf("temp.fil is not read only\n");

        if(attribute & FA_ARCH)
             printf("temp.fil has its archive bit set \n");

        if(unlink("temp.fil") == 0)
             printf("\nTemporary file successfully deleted\n");
        else
             perror("Error deleting file");
   }

   Return Value
   0 if succesful otherwise the DOS error code