6 files changed, 34 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/clock_gettime.2 b/lib/libsys/clock_gettime.2
index 89551d0f720b..841673648dfc 100644
--- a/lib/libsys/clock_gettime.2
+++ b/lib/libsys/clock_gettime.2
@@ -27,7 +27,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd August 10, 2024
+.Dd October 15, 2025
 .Dt CLOCK_GETTIME 2
 .Os
 .Sh NAME
@@ -80,7 +80,6 @@ Behavior during a leap second is not defined by and POSIX standard.
 Increments in SI seconds, even while the system is suspended.
 Its epoch is unspecified.
 The count is not adjusted by leap seconds.
-.Fx implements
 .It Dv CLOCK_UPTIME
 .It Dv CLOCK_UPTIME_PRECISE
 .It Dv CLOCK_UPTIME_FAST
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/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.