wayland学习一 ——client connect到wayland server

关于https://wayland-book.com/wayland-display/creation.html的实践和理解

wl_display_connect is the most common way for clients to establish a Wayland connection. The signature is:
struct wl_display *wl_display_connect(const char *name);
The “name” argument is the name of the Wayland display, which is typically “wayland-0”. You can swap the NULL for this in our test client and try for yourself — it’s likely to work. This corresponds to the name of a Unix socket in $XDG_RUNTIME_DIR. NULL is preferred, however, in which case libwayland will:

If $WAYLAND_DISPLAY is set, attempt to connect to X D G R U N T I M E D I R / XDG_RUNTIME_DIR/ XDGRUNTIMEDIR/WAYLAND_DISPLAY
Attempt to connect to $XDG_RUNTIME_DIR/wayland-0
Fail

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