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Index: head/lib/libc/gen/basename.3
===================================================================
--- head/lib/libc/gen/basename.3
+++ head/lib/libc/gen/basename.3
@@ -16,7 +16,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd July 28, 2016
+.Dd July 29, 2016
.Dt BASENAME 3
.Os
.Sh NAME
@@ -61,8 +61,16 @@
returns a pointer to internal storage space allocated on the first call
that will be overwritten
by subsequent calls.
+.Pp
+Other vendor implementations of
+.Fn basename
+may store their result in the input buffer,
+making it safe to use in multithreaded applications.
+Future versions of
+.Fx
+will follow this approach as well.
.Fn basename_r
-is therefore preferred for threaded applications.
+will then become obsolete.
.Sh RETURN VALUES
On successful completion,
.Fn basename
Index: head/lib/libc/gen/dirname.3
===================================================================
--- head/lib/libc/gen/dirname.3
+++ head/lib/libc/gen/dirname.3
@@ -16,7 +16,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd July 28, 2016
+.Dd July 29, 2016
.Dt DIRNAME 3
.Os
.Sh NAME
@@ -56,10 +56,11 @@
.Pp
Other vendor implementations of
.Fn dirname
-may modify the contents of the string passed to
-.Fn dirname ;
-this should be taken into account when writing code which calls this function
-if portability is desired.
+may store their result in the input buffer,
+making it safe to use in multithreaded applications.
+Future versions of
+.Fx
+will follow this approach as well.
.Sh RETURN VALUES
On successful completion,
.Fn dirname

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