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-rw-r--r--manual/llio.texi3
1 files changed, 3 insertions, 0 deletions
diff --git a/manual/llio.texi b/manual/llio.texi
index b7dbdefeb7..2e497bf512 100644
--- a/manual/llio.texi
+++ b/manual/llio.texi
@@ -3070,6 +3070,9 @@ Unix before @code{ftruncate} was invented, and is retained for backward
compatibility.
@end deftypevr
+The remaining operating modes are BSD extensions. They exist only
+on some systems. On other systems, these macros are not defined.
+
@comment fcntl.h
@comment BSD
@deftypevr Macro int O_SHLOCK