usbmuxd stands for "USB multiplexing daemon". This daemon is in charge
of multiplexing connections over USB to an iOS device. To users, it
means you can sync your music, contacts, photos, etc. over USB. To
developers, it means you can connect to any listening localhost socket
on the device. usbmuxd is not used for tethering data transfer which
uses a dedicated USB interface as a virtual network device.Multiple
connections to different TCP ports can happen in parallel. The higher-
level layers are handled by libimobiledevice.
When usbmuxd is running (normally started, or stopped as a result of
"udev" auto-insertion messages or by systemd) it provides a socket
interface in "/var/run/usbmuxd" that is designed to be compatible with
the socket interface that is provided on Mac OS X.
You should also create a "usbmux" user that has access to USB devices
on your system. Alternatively, you can pass a different username using
the -U argument.
Due to iOS 7 the daemon now also manages pairing records with iOS
devices and the host in "/var/lib/lockdown" (Linux) or "/var/db/lock-
down"(Mac OS X). Ensure proper permissions are setup for the daemon to
access the directory.
-U, --user USER
Change to this user after startup (needs USB privileges).
Do not daemonize (implies one -v).
Disables automatic discovery of devices on hotplug. Starting
another instance will trigger discovery instead.
Enable "--exit" request from other instances and exit automati-
cally if no device is attached.
Run in udev operation mode (implies -n and -z).
Run in systemd operation mode (implies -z and -f).
Notify a running instance to exit if there are no devices con-
nected (sends SIGUSR1 to running instance) and exit.
Notify a running instance to exit even if there are still
The first usbmuxd daemon implementation was authored by Hector Martin.
Now mainly developed by Nikias Bassen, Martin Szulecki and contributors
(see AUTHORS file).
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