diff --git a/lib/libc/sys/read.2 b/lib/libc/sys/read.2
index 8b58debd3fbb..28d085562af3 100644
--- a/lib/libc/sys/read.2
+++ b/lib/libc/sys/read.2
@@ -1,310 +1,312 @@
 .\" Copyright (c) 1980, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions
 .\" are met:
 .\" 1. Redistributions of source code must retain the above copyright
 .\"    notice, this list of conditions and the following disclaimer.
 .\" 2. Redistributions in binary form must reproduce the above copyright
 .\"    notice, this list of conditions and the following disclaimer in the
 .\"    documentation and/or other materials provided with the distribution.
 .\" 3. Neither the name of the University nor the names of its contributors
 .\"    may be used to endorse or promote products derived from this software
 .\"    without specific prior written permission.
 .\"
 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
 .\"     @(#)read.2	8.4 (Berkeley) 2/26/94
 .\" $FreeBSD$
 .\"
-.Dd June 4, 2020
+.Dd October 7, 2022
 .Dt READ 2
 .Os
 .Sh NAME
 .Nm read ,
 .Nm readv ,
 .Nm pread ,
 .Nm preadv
 .Nd read input
 .Sh LIBRARY
 .Lb libc
 .Sh SYNOPSIS
 .In unistd.h
 .Ft ssize_t
 .Fn read "int fd" "void *buf" "size_t nbytes"
 .Ft ssize_t
 .Fn pread "int fd" "void *buf" "size_t nbytes" "off_t offset"
 .In sys/uio.h
 .Ft ssize_t
 .Fn readv "int fd" "const struct iovec *iov" "int iovcnt"
 .Ft ssize_t
 .Fn preadv "int fd" "const struct iovec *iov" "int iovcnt" "off_t offset"
 .Sh DESCRIPTION
 The
 .Fn read
 system call
 attempts to read
 .Fa nbytes
 of data from the object referenced by the descriptor
 .Fa fd
 into the buffer pointed to by
 .Fa buf .
 The
 .Fn readv
 system call
 performs the same action, but scatters the input data
 into the
 .Fa iovcnt
 buffers specified by the members of the
 .Fa iov
 array: iov[0], iov[1], ..., iov[iovcnt\|\-\|1].
 The
 .Fn pread
 and
 .Fn preadv
 system calls
 perform the same functions, but read from the specified position in
 the file without modifying the file pointer.
 .Pp
 For
 .Fn readv
 and
 .Fn preadv ,
 the
 .Fa iovec
 structure is defined as:
 .Pp
 .Bd -literal -offset indent -compact
 struct iovec {
 	void   *iov_base;  /* Base address. */
 	size_t iov_len;    /* Length. */
 };
 .Ed
 .Pp
 Each
 .Fa iovec
 entry specifies the base address and length of an area
 in memory where data should be placed.
 The
 .Fn readv
 system call
 will always fill an area completely before proceeding
 to the next.
 .Pp
 On objects capable of seeking, the
 .Fn read
 starts at a position
 given by the pointer associated with
 .Fa fd
 (see
 .Xr lseek 2 ) .
 Upon return from
 .Fn read ,
 the pointer is incremented by the number of bytes actually read.
 .Pp
 Objects that are not capable of seeking always read from the current
 position.
 The value of the pointer associated with such an
 object is undefined.
 .Pp
 Upon successful completion,
 .Fn read ,
 .Fn readv ,
 .Fn pread
 and
 .Fn preadv
 return the number of bytes actually read and placed in the buffer.
 The system guarantees to read the number of bytes requested if
 the descriptor references a normal file that has that many bytes left
 before the end-of-file, but in no other case.
 .Pp
 In accordance with
 .St -p1003.1-2004 ,
 both
 .Xr read 2
 and
 .Xr write 2
 syscalls are atomic with respect to each other in the effects on file
 content, when they operate on regular files.
 If two threads each call one of the
 .Xr read 2
 or
 .Xr write 2 ,
 syscalls, each call will see either all of the changes of the other call,
 or none of them.
 The
 .Fx
 kernel implements this guarantee by locking the file ranges affected by
 the calls.
 .Sh RETURN VALUES
 If successful, the
 number of bytes actually read is returned.
 Upon reading end-of-file,
 zero is returned.
 Otherwise, a -1 is returned and the global variable
 .Va errno
 is set to indicate the error.
 .Sh ERRORS
 The
 .Fn read ,
 .Fn readv ,
 .Fn pread
 and
 .Fn preadv
 system calls
 will succeed unless:
 .Bl -tag -width Er
 .It Bq Er EBADF
 The
 .Fa fd
 argument
 is not a valid file or socket descriptor open for reading.
 .It Bq Er ECONNRESET
 The
 .Fa fd
 argument refers to a socket, and the remote socket end is
 forcibly closed.
 .It Bq Er EFAULT
 The
 .Fa buf
 argument
 points outside the allocated address space.
 .It Bq Er EIO
 An I/O error occurred while reading from the file system.
 .It Bq Er EINTEGRITY
 Corrupted data was detected while reading from the file system.
 .It Bq Er EBUSY
 Failed to read from a file, e.g. /proc/<pid>/regs while <pid> is not stopped
 .It Bq Er EINTR
 A read from a slow device
 (i.e.\& one that might block for an arbitrary amount of time)
 was interrupted by the delivery of a signal
 before any data arrived.
 .It Bq Er EINVAL
 The pointer associated with
 .Fa fd
 was negative.
 .It Bq Er EAGAIN
 The file was marked for non-blocking I/O,
 and no data were ready to be read.
 .It Bq Er EISDIR
 The file descriptor is associated with a directory.
 Directories may only be read directly by root if the filesystem supports it and
 the
 .Dv security.bsd.allow_read_dir
 sysctl MIB is set to a non-zero value.
 For most scenarios, the
 .Xr readdir 3
 function should be used instead.
 .It Bq Er EOPNOTSUPP
 The file descriptor is associated with a file system and file type that
 do not allow regular read operations on it.
 .It Bq Er EOVERFLOW
 The file descriptor is associated with a regular file,
 .Fa nbytes
 is greater than 0,
 .Fa offset
 is before the end-of-file, and
 .Fa offset
 is greater than or equal to the offset maximum established
 for this file system.
 .It Bq Er EINVAL
 The value
 .Fa nbytes
 is greater than
 .Dv INT_MAX .
 .El
 .Pp
 In addition,
 .Fn readv
 and
 .Fn preadv
 may return one of the following errors:
 .Bl -tag -width Er
 .It Bq Er EINVAL
 The
 .Fa iovcnt
 argument
 was less than or equal to 0, or greater than
 .Dv IOV_MAX .
 .It Bq Er EINVAL
 One of the
 .Fa iov_len
 values in the
 .Fa iov
 array was negative.
 .It Bq Er EINVAL
 The sum of the
 .Fa iov_len
 values in the
 .Fa iov
 array overflowed a 32-bit integer.
+.It Bq Er EINVAL
+The current file offset is not a multiple of the block size.
 .It Bq Er EFAULT
 Part of the
 .Fa iov
 array points outside the process's allocated address space.
 .El
 .Pp
 The
 .Fn pread
 and
 .Fn preadv
 system calls may also return the following errors:
 .Bl -tag -width Er
 .It Bq Er EINVAL
 The
 .Fa offset
 value was negative.
 .It Bq Er ESPIPE
 The file descriptor is associated with a pipe, socket, or FIFO.
 .El
 .Sh SEE ALSO
 .Xr dup 2 ,
 .Xr fcntl 2 ,
 .Xr getdirentries 2 ,
 .Xr open 2 ,
 .Xr pipe 2 ,
 .Xr select 2 ,
 .Xr socket 2 ,
 .Xr socketpair 2 ,
 .Xr fread 3 ,
 .Xr readdir 3
 .Sh STANDARDS
 The
 .Fn read
 system call is expected to conform to
 .St -p1003.1-90 .
 The
 .Fn readv
 and
 .Fn pread
 system calls are expected to conform to
 .St -xpg4.2 .
 .Sh HISTORY
 The
 .Fn preadv
 system call appeared in
 .Fx 6.0 .
 The
 .Fn pread
 function appeared in
 .At V.4 .
 The
 .Fn readv
 system call appeared in
 .Bx 4.2 .
 The
 .Fn read
 function appeared in
 .At v1 .
diff --git a/lib/libc/sys/write.2 b/lib/libc/sys/write.2
index 937e95b53a14..048338ed4dee 100644
--- a/lib/libc/sys/write.2
+++ b/lib/libc/sys/write.2
@@ -1,314 +1,316 @@
 .\" Copyright (c) 1980, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions
 .\" are met:
 .\" 1. Redistributions of source code must retain the above copyright
 .\"    notice, this list of conditions and the following disclaimer.
 .\" 2. Redistributions in binary form must reproduce the above copyright
 .\"    notice, this list of conditions and the following disclaimer in the
 .\"    documentation and/or other materials provided with the distribution.
 .\" 3. Neither the name of the University nor the names of its contributors
 .\"    may be used to endorse or promote products derived from this software
 .\"    without specific prior written permission.
 .\"
 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
 .\"     @(#)write.2	8.5 (Berkeley) 4/2/94
 .\" $FreeBSD$
 .\"
-.Dd February 11, 2021
+.Dd October 7, 2022
 .Dt WRITE 2
 .Os
 .Sh NAME
 .Nm write ,
 .Nm writev ,
 .Nm pwrite ,
 .Nm pwritev
 .Nd write output
 .Sh LIBRARY
 .Lb libc
 .Sh SYNOPSIS
 .In unistd.h
 .Ft ssize_t
 .Fn write "int fd" "const void *buf" "size_t nbytes"
 .Ft ssize_t
 .Fn pwrite "int fd" "const void *buf" "size_t nbytes" "off_t offset"
 .In sys/uio.h
 .Ft ssize_t
 .Fn writev "int fd" "const struct iovec *iov" "int iovcnt"
 .Ft ssize_t
 .Fn pwritev "int fd" "const struct iovec *iov" "int iovcnt" "off_t offset"
 .Sh DESCRIPTION
 The
 .Fn write
 system call
 attempts to write
 .Fa nbytes
 of data to the object referenced by the descriptor
 .Fa fd
 from the buffer pointed to by
 .Fa buf .
 The
 .Fn writev
 system call
 performs the same action, but gathers the output data
 from the
 .Fa iovcnt
 buffers specified by the members of the
 .Fa iov
 array: iov[0], iov[1], ..., iov[iovcnt\|-\|1].
 The
 .Fn pwrite
 and
 .Fn pwritev
 system calls
 perform the same functions, but write to the specified position in
 the file without modifying the file pointer.
 .Pp
 For
 .Fn writev
 and
 .Fn pwritev ,
 the
 .Fa iovec
 structure is defined as:
 .Pp
 .Bd -literal -offset indent -compact
 struct iovec {
 	void   *iov_base;  /* Base address. */
 	size_t iov_len;    /* Length. */
 };
 .Ed
 .Pp
 Each
 .Fa iovec
 entry specifies the base address and length of an area
 in memory from which data should be written.
 The
 .Fn writev
 system call
 will always write a complete area before proceeding
 to the next.
 .Pp
 On objects capable of seeking, the
 .Fn write
 starts at a position
 given by the pointer associated with
 .Fa fd ,
 see
 .Xr lseek 2 .
 Upon return from
 .Fn write ,
 the pointer is incremented by the number of bytes which were written.
 .Pp
 Objects that are not capable of seeking always write from the current
 position.
 The value of the pointer associated with such an object
 is undefined.
 .Pp
 If the real user is not the super-user, then
 .Fn write
 clears the set-user-id bit on a file.
 This prevents penetration of system security
 by a user who
 .Dq captures
 a writable set-user-id file
 owned by the super-user.
 .Pp
 When using non-blocking I/O on objects such as sockets that are subject
 to flow control,
 .Fn write
 and
 .Fn writev
 may write fewer bytes than requested;
 the return value must be noted,
 and the remainder of the operation should be retried when possible.
 .Sh RETURN VALUES
 Upon successful completion the number of bytes which were written
 is returned.
 Otherwise a -1 is returned and the global variable
 .Va errno
 is set to indicate the error.
 .Sh ERRORS
 The
 .Fn write ,
 .Fn writev ,
 .Fn pwrite
 and
 .Fn pwritev
 system calls
 will fail and the file pointer will remain unchanged if:
 .Bl -tag -width Er
 .It Bq Er EBADF
 The
 .Fa fd
 argument
 is not a valid descriptor open for writing.
 .It Bq Er EPIPE
 An attempt is made to write to a pipe that is not open
 for reading by any process.
 .It Bq Er EPIPE
 An attempt is made to write to a socket of type
 .Dv SOCK_STREAM
 that is not connected to a peer socket.
 .It Bq Er EFBIG
 An attempt was made to write a file that exceeds the process's
 file size limit or the maximum file size.
 .It Bq Er EFAULT
 Part of
 .Fa iov
 or data to be written to the file
 points outside the process's allocated address space.
 .It Bq Er EINVAL
 The pointer associated with
 .Fa fd
 was negative.
 .It Bq Er ENOSPC
 There is no free space remaining on the file system
 containing the file.
 .It Bq Er EDQUOT
 The user's quota of disk blocks on the file system
 containing the file has been exhausted.
 .It Bq Er EIO
 An I/O error occurred while reading from or writing to the file system.
 .It Bq Er EINTR
 A signal interrupted the write before it could be completed.
 .It Bq Er EAGAIN
 The file was marked for non-blocking I/O,
 and no data could be written immediately.
 .It Bq Er EROFS
 An attempt was made to write over a disk label area at the beginning
 of a slice.
 Use
 .Xr disklabel 8
 .Fl W
 to enable writing on the disk label area.
 .It Bq Er EINVAL
 The value
 .Fa nbytes
 is greater than
 .Dv SSIZE_MAX
 (or greater than
 .Dv INT_MAX ,
 if the sysctl
 .Va debug.iosize_max_clamp
 is non-zero).
+.It Bq Er EINVAL
+The current file offset is not a multiple of the block size.
 .It Bq Er EINTEGRITY
 The backing store for
 .Fa fd
 detected corrupted data while reading.
 (For example, writing a partial filesystem block may require first reading
 the existing block which may trigger this error.)
 .El
 .Pp
 In addition,
 .Fn writev
 and
 .Fn pwritev
 may return one of the following errors:
 .Bl -tag -width Er
 .It Bq Er EDESTADDRREQ
 The destination is no longer available when writing to a
 .Ux
 domain datagram socket on which
 .Xr connect 2
 had been used to set a destination address.
 .It Bq Er EINVAL
 The
 .Fa iovcnt
 argument
 was less than or equal to 0, or greater than
 .Dv IOV_MAX .
 .It Bq Er EINVAL
 One of the
 .Fa iov_len
 values in the
 .Fa iov
 array was negative.
 .It Bq Er EINVAL
 The sum of the
 .Fa iov_len
 values is greater than
 .Dv SSIZE_MAX
 (or greater than
 .Dv INT_MAX ,
 if the sysctl
 .Va debug.iosize_max_clamp
 is non-zero).
 .It Bq Er ENOBUFS
 The mbuf pool has been completely exhausted when writing to a socket.
 .El
 .Pp
 The
 .Fn pwrite
 and
 .Fn pwritev
 system calls may also return the following errors:
 .Bl -tag -width Er
 .It Bq Er EINVAL
 The
 .Fa offset
 value was negative.
 .It Bq Er ESPIPE
 The file descriptor is associated with a pipe, socket, or FIFO.
 .El
 .Sh SEE ALSO
 .Xr fcntl 2 ,
 .Xr lseek 2 ,
 .Xr open 2 ,
 .Xr pipe 2 ,
 .Xr select 2
 .Sh STANDARDS
 The
 .Fn write
 system call is expected to conform to
 .St -p1003.1-90 .
 The
 .Fn writev
 and
 .Fn pwrite
 system calls are expected to conform to
 .St -xpg4.2 .
 .Sh HISTORY
 The
 .Fn pwritev
 system call appeared in
 .Fx 6.0 .
 The
 .Fn pwrite
 function appeared in
 .At V.4 .
 The
 .Fn writev
 system call appeared in
 .Bx 4.2 .
 The
 .Fn write
 function appeared in
 .At v1 .
 .Sh BUGS
 The
 .Fn pwrite
 system call appends the file without changing the file offset if
 .Dv O_APPEND
 is set, contrary to
 .St -p1003.1-2008
 where
 .Fn pwrite
 writes into
 .Fa offset
 regardless of whether
 .Dv O_APPEND
 is set.