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D50703.1784392517.diff
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diff --git a/sys/sys/fcntl.h b/sys/sys/fcntl.h
--- a/sys/sys/fcntl.h
+++ b/sys/sys/fcntl.h
@@ -143,6 +143,16 @@
#define O_NAMEDATTR 0x04000000 /* NFSv4 named attributes */
#endif
+/*
+ * !!! DANGER !!!
+ *
+ * There are very few bits left for O_* flags. Every bit we consume for
+ * local features is one bit we can't use for future source compatibility
+ * with other operating systems.
+ *
+ * All additions should be coordinated with srcmgr@.
+ */
+
/*
* XXX missing O_RSYNC.
*/
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D50703: fcntl.h: warn that bits for O_* flags are scarce
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