# define O_NONBLOCK O_NDELAY
#endif
+/* If the gnulib module 'nonblocking' is in use, guarantee a working non-zero
+ value of O_NONBLOCK. Otherwise, O_NONBLOCK is defined (above) to O_NDELAY
+ or to 0 as fallback. */
#if @GNULIB_NONBLOCKING@
# if O_NONBLOCK
# define GNULIB_defined_O_NONBLOCK 0
# define O_TTY_INIT 0
#endif
+#if O_ACCMODE != (O_RDONLY | O_WRONLY | O_RDWR | O_EXEC | O_SEARCH)
+# undef O_ACCMODE
+# define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR | O_EXEC | O_SEARCH)
+#endif
+
/* For systems that distinguish between text and binary I/O.
O_BINARY is usually declared in fcntl.h */
#if !defined O_BINARY && defined _O_BINARY