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Everything the server said went out through msg_send(), which loops on
sendmsg() until the kernel has taken all of it. That is a blocking write
to whoever is attached. A display whose reader has paused -- C-s at the
terminal, a stopped ssh, a client being swapped -- fills its socket
buffer, and then the *server* sits inside that loop: every other pane,
the config watcher, the control socket and every other connection stop
with it. A session that is supposed to outlive its client hangs on one.
macOS is where this showed up, because its socket buffers are a fraction
of Linux's 64K and it wedges within a screenful rather than after a few
hundred. `make test-live` could not get past the forty-connection probe
in test_session.py: the server was blocked writing to a pty nobody was
draining, so `slosh cmd panes` timed out and took the suite with it.
So connections are non-blocking and output is queued, flushed when
poll() says the socket will take more. The queue is capped: past 4MB we
are not buffering a slow reader any more, we are storing a screen nobody
is looking at, and the connection is dropped -- a display that comes
back reattaches and gets a full repaint, which is what happens after any
detach anyway.
Measured, with a pane running `yes` and a display that never reads:
before, the first control command hung forever; after, 40 of 40 are
answered, the session stays listed, and the server's RSS is flat.
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The out-of-the-box look, rethought as one piece:
- the compiled-in palette calms down: muted blue #7aa2f7 on the same
neutral darks, with the colours that mean something kept semantic --
amber bell, red-orange dead. sl0p stays one include away as the house
style, and contrib/themes/default.kdl is the starting point written
down (theme-tour shows it).
- derived state defaults now actually follow the theme: the scrolled
wash is rebuilt from scroll_bg after the theme block (it used to bake
the compiled accent), and declaring a state -- in any file of an
include chain -- still wins. The dump writes derived states as
comments so C-a e cannot pin what is meant to keep following.
- a bell you can see: the frame blinks three times in theme's bell
colour then breathes until answered, and a soft diagonal shimmer --
the bell colour halved towards default_fg, width breathing on a sine
-- crosses the body for the same 900ms. bell_indicator false silences
all of it; states { bell { } } replaces it like any state. since
carries the clock dependency, so an idle session pays nothing.
- scrollback says where it continues: while scrolled, the viewport's
top and bottom rows melt towards an edge with content past it and
turn solid at the buffer's end. New expression variables above/below
(lines hidden past each edge, own dependency bit, cached per scroll
position), carried in shade_ctx_t -- SLOSH_SHADER_ABI 3 -> 4.
- expressions survive the dump: a program keeps its source and cb_chain
writes it back, so amount="(y % 2) * 40" no longer dumps as a number.
- headers move to include/, -Iinclude everywhere; the plugin Makefile's
SLOSH var becomes SLOSH_DIR because slosh exports SLOSH=1 into every
pane it runs, and building from inside a session read that as a path.
- comment drift culled where features outran the prose, and the
derivation boilerplate folded into derived_pass()/ctx_scroll().
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