6 files changed, 35 insertions, 5 deletions
diff --git a/lib/libsys/_libsys.h b/lib/libsys/_libsys.h
index 6bd768708a78..12417b572a60 100644
--- a/lib/libsys/_libsys.h
+++ b/lib/libsys/_libsys.h
@@ -32,6 +32,7 @@ struct itimerspec;
 struct itimerval;
 struct jail;
 struct kevent;
+struct kexec_segment;
 struct kld_file_stat;
 struct mac;
 struct module_stat;
@@ -470,6 +471,7 @@ typedef int (__sys_getgroups_t)(int, gid_t *);
 typedef int (__sys_setgroups_t)(int, const gid_t *);
 typedef int (__sys_jail_attach_jd_t)(int);
 typedef int (__sys_jail_remove_jd_t)(int);
+typedef int (__sys_kexec_load_t)(uint64_t, u_long, struct kexec_segment *, u_long);
 
 _Noreturn void __sys__exit(int rval);
 int __sys_fork(void);
@@ -876,6 +878,7 @@ int __sys_getgroups(int gidsetsize, gid_t * gidset);
 int __sys_setgroups(int gidsetsize, const gid_t * gidset);
 int __sys_jail_attach_jd(int fd);
 int __sys_jail_remove_jd(int fd);
+int __sys_kexec_load(uint64_t entry, u_long nseg, struct kexec_segment * segments, u_long flags);
 __END_DECLS
 
 #endif /* __LIBSYS_H_ */
diff --git a/lib/libsys/closefrom.2 b/lib/libsys/closefrom.2
index 1885a6fdeaa8..e6b4a5a3e9d7 100644
--- a/lib/libsys/closefrom.2
+++ b/lib/libsys/closefrom.2
@@ -23,7 +23,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd May 17, 2025
+.Dd October 27, 2025
 .Dt CLOSEFROM 2
 .Os
 .Sh NAME
@@ -94,6 +94,11 @@ function first appeared in
 .Fx 8.0 .
 .Pp
 The
+.Fn close_range
+function first appeared in
+.Fx 12.2 .
+.Pp
+The
 .Dv CLOSE_RANGE_CLOFORK
 flag appeared in
 .Fx 15.0 .
diff --git a/lib/libsys/getrlimitusage.2 b/lib/libsys/getrlimitusage.2
index e2114def56c2..d0e92d7f88b4 100644
--- a/lib/libsys/getrlimitusage.2
+++ b/lib/libsys/getrlimitusage.2
@@ -25,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd September 27, 2024
+.Dd October 24, 2025
 .Dt GETRLIMITUSAGE 2
 .Os
 .Sh NAME
@@ -97,4 +97,4 @@ and
 The
 .Fn getrlimitusage
 system call appeared in
-.Bx 15.0 .
+.Fx 14.2 .
diff --git a/lib/libsys/revoke.2 b/lib/libsys/revoke.2
index f5ae1e92c357..938d2f083e27 100644
--- a/lib/libsys/revoke.2
+++ b/lib/libsys/revoke.2
@@ -28,7 +28,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd January 25, 2016
+.Dd October 24, 2025
 .Dt REVOKE 2
 .Os
 .Sh NAME
@@ -62,7 +62,7 @@ using a special close method which does not block.
 Access to a file may be revoked only by its owner or the super user.
 The
 .Fn revoke
-system call is currently supported only for block and character special
+system call is currently supported only for character special
 device files.
 It is normally used to prepare a terminal device for a new login session,
 preventing any access by a previous user of the terminal.
diff --git a/lib/libsys/syscalls.map b/lib/libsys/syscalls.map
index b5400b9849b3..d00c862eb462 100644
--- a/lib/libsys/syscalls.map
+++ b/lib/libsys/syscalls.map
@@ -817,4 +817,6 @@ FBSDprivate_1.0 {
 	__sys_jail_attach_jd;
 	_jail_remove_jd;
 	__sys_jail_remove_jd;
+	_kexec_load;
+	__sys_kexec_load;
 };
diff --git a/lib/libsys/write.2 b/lib/libsys/write.2
index d2ff41ceead9..77067893ab4c 100644
--- a/lib/libsys/write.2
+++ b/lib/libsys/write.2
@@ -132,6 +132,26 @@ and
 may write fewer bytes than requested;
 the return value must be noted,
 and the remainder of the operation should be retried when possible.
+.Sh ATOMICITY OF WRITES
+When operating on regular files on local file systems, the effects of
+.Fn write
+are atomic.
+As required by the POSIX standard,
+the
+.Fn read ,
+.Fn write ,
+and
+.Fn ftruncate
+functions and their variations are atomic with respect to
+each other on the file data and metadata for regular files.
+See for instance
+.St -p1003.1-2024
+Volume 2, Section 2.9.7 for more information.
+.Pp
+.Fx
+implements the requirement by taking
+a read/write range lock on the file byte range
+affected by the corresponding function.
 .Sh RETURN VALUES
 Upon successful completion the number of bytes which were written
 is returned.