Daan De Meyer 1b7a42178a vmspawn: use PTY for native console to avoid QEMU O_NONBLOCK issue
QEMU's stdio chardev sets O_NONBLOCK on both stdin and stdout (see
chardev/char-stdio.c [1] and chardev/char-fd.c [2]). Since forked
processes share file descriptions, and on a terminal all three stdio
fds typically reference the same file description, this affects our
own stdio too.

Avoid this by using a PTY with chardev serial instead of chardev
stdio for native console mode, matching the approach already used
for interactive and read-only modes. The PTY forwarder shovels bytes
transparently between our stdio and QEMU's PTY using the new
PTY_FORWARD_DUMB_TERMINAL and PTY_FORWARD_TRANSPARENT flags, which
disable terminal decoration (background tinting, window title, OSC
context) and escape sequence handling (Ctrl-] exit, hotkeys)
respectively.

The chardev is configured with mux=on so the QEMU monitor remains
accessible via Ctrl-a c.

Also dedup CONSOLE_NATIVE, CONSOLE_READ_ONLY, and CONSOLE_INTERACTIVE
handling by using fallthrough, with the only differences being the
ptyfwd flags, mux setting, and monitor section.

[1] https://gitlab.com/qemu-project/qemu/-/blob/master/chardev/char-stdio.c
[2] https://gitlab.com/qemu-project/qemu/-/blob/master/chardev/char-fd.c

Co-developed-by: Claude Opus 4.6 <noreply@anthropic.com>
2026-04-02 15:12:52 +02:00
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Systemd

System and Service Manager

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