Use default-shell for command prompt #() and popups as well

It should no longer be necessary to ignore SIGCHLD because it is now
blocked around daemon(), and doing so causes trouble with newer libevent
(it cannot restore the original handler). Reported by Aza

It should no longer be necessary to ignore SIGCHLD because it is now
blocked around daemon(), and doing so causes trouble with newer libevent
(it cannot restore the original handler). Reported by Azat Khuzhin in
GitHub issue 3626.

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Loop around waitpid in client, from Azat Khuzhin.

If a pane is killed, cancel reading from the file. GitHub issue 3422.

Add an ACL list for users connecting to the tmux socket. Users may be
forbidden from attaching, forced to attach read-only, or allowed to
attach read-write. A new command, server-access, configures t

Add an ACL list for users connecting to the tmux socket. Users may be
forbidden from attaching, forced to attach read-only, or allowed to
attach read-write. A new command, server-access, configures the list.
tmux gets the user using getpeereid(3) of the client socket. Users must
still configure file system permissions manually. From Dallas Lyons and
others.

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Exit on SIGHUP before attach also, GitHub issue 3084.

Replace %% in command lists (by copying them) for template arguments ,
this means they can be used with {} as well. Also make argument
processing from an existing vector preserve commands. GitHub iss

Replace %% in command lists (by copying them) for template arguments ,
this means they can be used with {} as well. Also make argument
processing from an existing vector preserve commands. GitHub issue 2858.

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Move the call to setupterm() into the client and have it pass the
results to the server over imsg, means the server does not need to enter
ncurses or read terminfo db. Old clients will not work with

Move the call to setupterm() into the client and have it pass the
results to the server over imsg, means the server does not need to enter
ncurses or read terminfo db. Old clients will not work with a new
server.

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Do not care about the server socket closing if exiting anyway.

Add a couple of helper functions, and flush imsgs on exit.

Move file handling protocol stuff all into file.c so it can be reused
more easily.

Add -N flag to never start server even if command would normally do so,
GitHub issue 2523.

With csh, a tmux client gets SIGTERM before SIGCONT when killed with
"kill %%", so when the client tells the server it got SIGCONT, don't use
bits that may already have been freed when it got SIGTERM

With csh, a tmux client gets SIGTERM before SIGCONT when killed with
"kill %%", so when the client tells the server it got SIGCONT, don't use
bits that may already have been freed when it got SIGTERM. Also don't
print anything on exit if we get SIGTERM while suspended. Reported by
Theo.

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Fix warnings on some platforms with %llx and add a new message to handle
64-bit client flags.

Add a flag to make a client wait for an empty line before exiting in
control mode to avoid stray commands ending up in the shell.

Instead of a buffer size limit on each pane, set a limit of 300 seconds
of data for each client in control mode.

Instead of sending all data to control mode clients as fast as possible,
add a limit of how much data will be sent to the client and try to use
it for panes with some degree of fairness. GitHub issue

Instead of sending all data to control mode clients as fast as possible,
add a limit of how much data will be sent to the client and try to use
it for panes with some degree of fairness. GitHub issue 2217, with
George Nachman.

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Pass the stdout file descriptor from the client as well as stdin and use
them for control clients directly instead of passing everything via the
client.

imsg.h needs uio.h, pointed out by deraadt

Do not close the stdout file descriptor in control mode as it will be
needed for printing the exit messages. Fixes a bug when detaching with
iTerm2.

Tidy up the terminal detection and feature code and add named sets of
terminal features, each of which are defined in one place and map to a
builtin set of terminfo(5) capabilities. Features can be s

Tidy up the terminal detection and feature code and add named sets of
terminal features, each of which are defined in one place and map to a
builtin set of terminfo(5) capabilities. Features can be specified based
on TERM with a new terminal-features option or with the -T flag when
running tmux. tmux will also detect a few common terminals from the DA
and DSR responses.

This is intended to make it easier to configure tmux's use of
terminfo(5) even in the presence of outdated ncurses(3) or terminfo(5)
databases or for features which do not yet have a terminfo(5) entry.
Instead of having to grok terminfo(5) capability names and what they
should be set to in the terminal-overrides option, the user can
hopefully just give tmux a feature name and let it do the right thing.

The terminal-overrides option remains both for backwards compatibility
and to allow tweaks of individual capabilities.

tmux already did much of this already, this makes it tidier and simpler
to configure.

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Make struct cmd local to cmd.c and move it out of tmux.h.

Some unnecessary assignments and unused variables.

Add to rather than replace flags with -c.

When the server socket is given by the user with -S, create it with
umask 177 instead of 117 because it may not be in a safe directory like
the default directory in /tmp. The user can chmod it more o

When the server socket is given by the user with -S, create it with
umask 177 instead of 117 because it may not be in a safe directory like
the default directory in /tmp. The user can chmod it more open after it
is created if they want.

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