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D51851.id160267.diff
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diff --git a/lib/libsys/pathconf.2.clone b/lib/libsys/pathconf.2
--- a/lib/libsys/pathconf.2.clone
+++ b/lib/libsys/pathconf.2
@@ -25,7 +25,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd July 5, 2025
+.Dd August 6, 2025
.Dt PATHCONF 2
.Os
.Sh NAME
@@ -186,6 +186,11 @@
.Dv UF_SYSTEM
flags can be set by
.Xr chflags 2 ,
+otherwise 0.
+.It Li _PC_CLONE_BLKSIZE
+Returns the block size required for block cloning via
+.Xr copy_file_range 2
+for a file system if block cloning is supported,
otherwise 0.
.El
.Sh RETURN VALUES
@@ -264,6 +269,7 @@
.El
.Sh SEE ALSO
.Xr chflags 2 ,
+.Xr copy_file_range 2 ,
.Xr lseek 2 ,
.Xr sysctl 3
.Sh HISTORY
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D51851: pathconf.2: Add an entry for _PC_CLONE_BLKSIZE
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