Convert sbin and usr.bin to check for imsgbuf_init failure and add
imsgbuf_allow_fdpass where needed.

OK tb@

Convert the common imsgbuf_read calls to the post EAGAIN world.

OK tb@

Use imsgbuf_queuelen() instead of accessing the w.queue member.

OK tb@

Rename imsg_init, imsg_clear, imsg_read, imsg_write and imsg_flush to
imsgbuf_init, imsgbuf_clear, imsgbuf_read, imsgbuf_write and imsgbuf_flush.

This separates the imsgbuf API from the per-imsg API

Rename imsg_init, imsg_clear, imsg_read, imsg_write and imsg_flush to
imsgbuf_init, imsgbuf_clear, imsgbuf_read, imsgbuf_write and imsgbuf_flush.

This separates the imsgbuf API from the per-imsg API.

OK tb@

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Convert imsg_write() callers to the new simplified return logic.

OK tb@

Introduce imsg_write() and use it instead of msgbuf_write().

imsg_write() is just a thin wrapper around msgbuf_write(). So this is
mostly search and replace.

OK tb@

Add two new values for the destroy-unattached option to destroy sessions
only if they are not members of sessions groups, from Mark Huang, GitHub
issue 3806.

Use imsg_get_fd() instead of direct access to imsg.fd

The change in proc.c can be further simplified once imsg_free() takes
care of unclaimed file descriptors.

OK nicm@

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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Add formats for client and server UID and user (for multiuser setups).

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

SIGQUIT handler needs to be cleared before fork like the others,
reported by Simon Andersson.

Also ignore SIGQUIT so it can't be used to kill the client when locked.

Add a -D flag to ask tmux not to daemonize, useful both for running a
debugger (lldb does not have follow-fork-mode) and for running with a
managed supervisor init system. GitHub issue 2190.

Reduce a difference with portable tmux by adding the -V flag and
#{version} format; on OpenBSD these just report the OpenBSD version.

Because ignore SIGCHLD early, letting signal_del restore it doesn't work
correctly, so set it explicitly back to default (and the others for good
measure).

Fix redraw defer code in the presence of multiple clients - the timer
may be needed for all of them, so don't delete it on the first; and
don't skip setting the redraw flag if the timer is already ru

Fix redraw defer code in the presence of multiple clients - the timer
may be needed for all of them, so don't delete it on the first; and
don't skip setting the redraw flag if the timer is already running.

Reported by Pol Van Aubel in GitHub issue 1003.

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Do not need to set up USR2 twice.

Move signal code into proc.c.

proc_send_s now seems unnecessary.

Return 1 if name matches not 0, also fix some spaces.

Support SIGUSR2 to stop and start logging for an existing server. Also
we currently only have two log levels so just use -v and -vv rather than
-v and -vvvv, and clarify the man page entry for -v.

I no longer use my SourceForge address so replace it.

EAGAIN handling for imsg_read. OK henning@ benno@

Log some system and libevent information at startup.