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and VMIN settings.

Rev: src/unix_interact.c:1.14

Rev: src/client.c:1.133
Rev: src/gc.c:1.26
Rev: src/gc.h:1.11
Rev: src/io.c:1.152
Rev: src/io.h:1.82
Rev: src/io_commands.c:1.49
Rev: src/io_commands.h:1.23
Rev: src/lsh.c:1.151
Rev: src/read_file.c:1.3
Rev: src/reaper.c:1.22
Rev: src/unix_interact.c:1.13

files with gc_global() instead. Deleted all references to
io_backend in the rest of the source files. Doesn't quite work yet.

Rev: src/client.c:1.130
Rev: src/client.h:1.45
Rev: src/client_x11.c:1.12
Rev: src/gc.h:1.9
Rev: src/interact.h:1.9
Rev: src/io.c:1.148
Rev: src/io.h:1.80
Rev: src/io_commands.c:1.45
Rev: src/io_commands.h:1.20
Rev: src/lsh-decode-key.c:1.10
Rev: src/lsh-export-key.c:1.10
Rev: src/lsh-writekey.c:1.16
Rev: src/lsh.c:1.147
Rev: src/lsh.h:1.22
Rev: src/lsh_proxy.c:1.24
Rev: src/lshd.c:1.124
Rev: src/lshg.c:1.14
Rev: src/reaper.c:1.21
Rev: src/reaper.h:1.10
Rev: src/resource.h:1.12
Rev: src/server_session.c:1.68
Rev: src/server_session.h:1.16
Rev: src/server_userauth.h:1.19
Rev: src/sexp-conv.c:1.9
Rev: src/srp-gen.c:1.11
Rev: src/tcpforward_commands.c:1.36
Rev: src/tcpforward_commands.h:1.6
Rev: src/unix_interact.c:1.12
Rev: src/unix_user.c:1.41

interact, which points to the corresponding unix_interact.
(do_kill_window_subscriber): New function, which updates the
number of subscribers and removes the SIGWINCH handler if there
are no subscribers left.
(unix_interact): Added attributes backend, winch_handler and
nsubscribers.
(unix_window_change_subscribe): Keep track of number of
subscribers, and install the signal handler if it is needed.
(make_unix_interact): Don't install any signal handler yet.

Rev: src/unix_interact.c:1.11

behaviour.
* src/unix_interact.c (make_unix_interact): Likewise.

Rev: src/unix_interact.c:1.10

consistency. Updated all callers.

Rev: src/client_pty.c:1.18
Rev: src/io.c:1.140
Rev: src/resource.c:1.18
Rev: src/resource.h:1.11
Rev: src/server_pty.c:1.21
Rev: src/unix_interact.c:1.9
Rev: src/unix_user.c:1.40
Rev: src/xauth.c:1.2

Rev: src/unix_interact.c:1.8

string.
(unix_yes_or_no): Likewise.

Rev: src/unix_interact.c:1.7

(stop_handler): New signal handler for TSTP, that sets and resets
the tty modes.

Rev: src/unix_interact.c:1.6

Rev: src/unix_interact.c:1.5

comments. (GNU coding standard).

Rev: src/bignum.c:1.19
Rev: src/channel.c:1.93
Rev: src/channel_commands.c:1.23
Rev: src/client.c:1.106
Rev: src/client_keyexchange.c:1.57
Rev: src/client_userauth.c:1.46
Rev: src/connection.c:1.62
Rev: src/daemon.c:1.7
Rev: src/dh_exchange.c:1.12
Rev: src/gateway_channel.c:1.8
Rev: src/gateway_commands.c:1.8
Rev: src/gc.c:1.15
Rev: src/io.c:1.126
Rev: src/io_commands.c:1.36
Rev: src/jpoll.c:1.7
Rev: src/lsh_proxy.c:1.21
Rev: src/proxy_channel.c:1.5
Rev: src/proxy_session.c:1.9
Rev: src/proxy_tcpforward.c:1.6
Rev: src/proxy_userauth.c:1.7
Rev: src/reaper.c:1.19
Rev: src/server_keyexchange.c:1.47
Rev: src/server_pty.c:1.19
Rev: src/server_session.c:1.58
Rev: src/server_userauth.c:1.31
Rev: src/sexp.c:1.35
Rev: src/sexp_streamed_parser.c:1.29
Rev: src/spki_commands.c:1.18
Rev: src/tcpforward.c:1.60
Rev: src/tcpforward_commands.c:1.29
Rev: src/translate_signal.c:1.3
Rev: src/unix_interact.c:1.4
Rev: src/unix_random.c:1.8
Rev: src/unix_user.c:1.32
Rev: src/werror.c:1.50
Rev: src/zlib.c:1.30

volatile modifier to all uses of sig_atomic_t.

Rev: src/io.c:1.123
Rev: src/io.h:1.72
Rev: src/reaper.c:1.18
Rev: src/unix_interact.c:1.3

only if backend is non-NULL.

Rev: src/unix_interact.c:1.2

Rev: src/unix_interact.c:1.1