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[Bug]: get_backend() will get stuck if DISPLAY cannot be connected #26760

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[Bug]: get_backend() will get stuck if DISPLAY cannot be connected#26760
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status: needs clarificationIssues that need more information to resolve.
@maltoze

Description

@maltoze
maltoze
opened on Sep 13, 2023

Bug summary

matplotlib.get_backend() will get stuck if DISPLAY cannot be connected. Maybe should consider adding a timeout here.

matplotlib/src/_c_internal_utils.c

Lines 19 to 37 in 1b4b50b

if (getenv("DISPLAY")
&& (libX11 = dlopen("libX11.so.6", RTLD_LAZY))) {
struct Display* display = NULL;
struct Display* (* XOpenDisplay)(char const*) =
dlsym(libX11, "XOpenDisplay");
int (* XCloseDisplay)(struct Display*) =
dlsym(libX11, "XCloseDisplay");
if (XOpenDisplay && XCloseDisplay
&& (display = XOpenDisplay(NULL))) {
XCloseDisplay(display);
}
if (dlclose(libX11)) {
PyErr_SetString(PyExc_RuntimeError, dlerror());
return NULL;
}
if (display) {
Py_RETURN_TRUE;
}
}

Code for reproduction

import matplotlib
matplotlib.get_backend()

Actual outcome

get stuck

Expected outcome

return headless if DISPLAY cannot be connected

Additional information

No response

Operating system

No response

Matplotlib Version

3.7.3

Matplotlib Backend

No response

Python version

3.11.3

Jupyter version

No response

Installation

pip

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