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Fix linux segfault when no display #84

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Fix linux segfault when no display #84

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12 changes: 10 additions & 2 deletions mouse/_nixmouse.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,19 +14,25 @@
x11 = None
def build_display():
global display, window, x11
if display and window and x11: return
if x11: return
x11 = ctypes.cdll.LoadLibrary(ctypes.util.find_library('X11'))
# Required because we will have multiple threads calling x11,
# such as the listener thread and then main using "move_to".
x11.XInitThreads()
# Explicitly set XOpenDisplay.restype to avoid segfault on 64 bit OS.
# http://stackoverflow.com/questions/35137007/get-mouse-position-on-linux-pure-python
x11.XOpenDisplay.restype = c_void_p
display = c_void_p(x11.XOpenDisplay(0))
open_display = x11.XOpenDisplay(0)
if open_display is None:
print('Warning: no display')
return
display = c_void_p(open_display)
window = x11.XDefaultRootWindow(display)

def get_position():
build_display()
if display is None:
return -1, -1
root_id, child_id = c_void_p(), c_void_p()
root_x, root_y, win_x, win_y = c_int(), c_int(), c_int(), c_int()
mask = c_uint()
Expand All @@ -37,6 +43,8 @@ def get_position():

def move_to(x, y):
build_display()
if display is None:
raise ValueError('Unable to move as no display available')
x11.XWarpPointer(display, None, window, 0, 0, 0, 0, x, y)
x11.XFlush(display)

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