gistfile1.txt

/// This is the C-header that I'm using
typedef struct Monitor Monitor;
typedef struct Client Client;
struct Client {
	char name[256];
	float mina, maxa;
	int x, y, w, h;
	int oldx, oldy, oldw, oldh;
	int basew, baseh, incw, inch, maxw, maxh, minw, minh, hintsvalid;
	int bw, oldbw;
	unsigned int tags;
	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen, dontmanage;
	Client *next;
	Client *snext;
	Monitor *mon;
	Window win;
};

typedef struct {
	const char *symbol;
	void (*arrange)(Monitor *);
} Layout;

struct Monitor {
	char ltsymbol[16];
	float mfact;
	int nmaster;
	int num;
	int by;               /* bar geometry */
	int mx, my, mw, mh;   /* screen size */
	int wx, wy, ww, wh;   /* window area  */
	unsigned int seltags;
	unsigned int sellt;
	unsigned int tagset[2];
	int showbar;
	int topbar;
	Client *clients;
	Client *sel;
	Client *stack;
	Monitor *next;
	Window barwin;
	const Layout *lt[2];
};

/// It's used in Zig roughly like this


const _shared = @cImport({
    @cInclude("X11/Xlib.h");
    @cInclude("structs.h");
});


var mons = @extern(?*_shared.Monitor, .{
    .name = "mons",
});

extern "c" fn unmanage(*_shared.Client, c_int) void;

/// and then later, also in Zig:

fn cleanup() void {
    var m = mons;
    while (m) |mm| {
        while (mm.*.stack) |c| {
            /// unmanage is a C-function
            unmanage(c, 0);
        }

        m = mm.*.next;
    }
}