* src/process.c (conv_sockaddr_to_lisp):
Use strnlen rather than a circumlocution.

* src/process.c (wait_reading_process_output): Process status
changes of sub-processes when called with read_kbd zero and some
"keyboard input" is available, but no output from any sub-process.
(Bug#79777)

At least on MS-Windows, the last change caused the
process-tests/fd-setsize-no-crash/make-process test to hang.
* src/process.c (wait_reading_process_output) [WINDOWSNT]: Do
not stop monitoring the process descriptor when zero bytes are
read.  The EOF indication from subprocesses on MS-Windows is
detected via an error condition (see w32.c), while zero-size
reads are not to be taken as such.  (Bug#79436)

When a subprocess closes its stdout/stderr pipe, that causes
pselect to always indicate that fd is readable, and read to
always return with EOF on that fd.  Therefore when we receive an
EOF we need to stop monitoring the fd.  Otherwise Emacs will
spin at 100% CPU, repeatedly reading that same EOF off the fd.

* src/process.c (wait_reading_process_output): When
'read_process_output' returns EOF indication, stop monitoring
the descriptor.  (Bug#79436)