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fix: correct XRecordRange layout (32 bytes, device_events at offset 18)

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- XRecordRange is 32 bytes: core_requests(0), core_replies(2),
  ext_requests(4), ext_replies(10), delivered_events(16),
  device_events(18), errors(20), client_started(24), client_died(28)
- XRecordClientSpec is XID = unsigned long (8 bytes), not int (4 bytes)
- Use XRecordAllClients=3 instead of XRecordCurrentClients=1
This commit is contained in:
Khoa Vo 2026-06-26 10:05:22 +07:00
parent 12ac8b0c24
commit 3510cd7384
1 changed files with 10 additions and 11 deletions
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21
protocol/src/x11_capture.rs
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@ -46,14 +46,11 @@ struct X11Lib {
x_free: unsafe extern "C" fn(*mut c_void) -> c_int,
}
// XRecordRange - must match C layout exactly
// C layout: { int client_spec; struct { u8 first; u8 last; } device_events; ... }
// XRecordRange: 32 bytes total
// device_events is at offset 18 (XRecordRange8: first=offset 18, last=offset 19)
#[repr(C)]
struct XRecordRange {
client_spec: c_int,
device_events_first: u8,
device_events_last: u8,
_pad: [u8; 250],
_bytes: [u8; 32],
}
type XRecordCallback = unsafe extern "C" fn(*mut c_void, *mut XRecordInterceptData);
@ -332,18 +329,20 @@ impl X11Capture {
(lib.x_close_display)(display);
return None;
}
// Set range: KeyPress (2) through KeyRelease (3)
(*range).device_events_first = KEY_PRESS as u8;
(*range).device_events_last = KEY_RELEASE as u8;
// Set range: device_events at offset 18
// XRecordRange8: first byte, last byte
(*range)._bytes[18] = KEY_PRESS as u8; // device_events.first
(*range)._bytes[19] = KEY_RELEASE as u8; // device_events.last
eprintln!("[vietc] X11Capture: range set (KeyPress={}, KeyRelease={})", KEY_PRESS, KEY_RELEASE);
// Create XRecord context
let mut spec: c_int = 1; // XRecordAllClients = 1
// XRecordClientSpec is XID = unsigned long (8 bytes on x86_64)
let mut spec: u64 = 3; // XRecordAllClients = 3
let mut range_ptr: *mut XRecordRange = range;
let ctx = (lib.x_record_create_context)(
display,
0, // own_client
&mut spec, // clients
&mut spec as *mut u64 as *mut c_int, // client_spec (pointer to unsigned long)
1, // nclients
&mut range_ptr, // ranges (pointer to array of range pointers)
1, // nranges