The branch main has been updated by brooks:
URL:
https://cgit.FreeBSD.org/src/commit/?id=6d0a335aaa81d3ddce95de8d862a23c97bb038a6
commit 6d0a335aaa81d3ddce95de8d862a23c97bb038a6
Author: Brooks Davis <bro...@freebsd.org>
AuthorDate: 2025-06-12 13:33:35 +0000
Commit: Brooks Davis <bro...@freebsd.org>
CommitDate: 2025-06-12 13:34:05 +0000
fcntl.h: warn that bits for O_* flags are scarce
Running out of O_* flag bits will end out ability to make additions that
are source compatible with other operating systems.
Add a warning to coordinate all additions with srcmgr@.
Reviewed by: markj, emaste
Differential Revision: https://reviews.freebsd.org/D50703
---
sys/sys/fcntl.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/sys/sys/fcntl.h b/sys/sys/fcntl.h
index 08aa26fbce02..c23c7eba0544 100644
--- a/sys/sys/fcntl.h
+++ b/sys/sys/fcntl.h
@@ -143,6 +143,16 @@ typedef __pid_t pid_t;
#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.
*/
