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#define _O_RDONLY       0x0000  /* open for reading only */
#define _O_WRONLY       0x0001  /* open for writing only */
...
#define _O_WTEXT        0x10000 /* file mode is UTF16 (translated) */
#define _O_U16TEXT      0x20000 /* file mode is UTF16 no BOM (translat
+ed) */
#define _O_U8TEXT       0x40000 /* file mode is UTF8  no BOM (translat
+ed) */

if( $mode & 1 ) { ## _O_WRONLY
    say "File is opend WRITE only
}