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X11: Fix previous error handler not being restored

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GLFW did not restore the previous Xlib error handler when removing its
own, instead resetting to the default handler.

This commit saves and restores the previous error handler.

None of this is thread-safe or could ever be.

Fixes #2108
This commit is contained in:
Camilla Löwy 2022-05-25 19:43:55 +02:00
parent 736a88b067
commit 26920a1a38
3 changed files with 8 additions and 2 deletions
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1
README.md
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@ -292,6 +292,7 @@ information on what to include when reporting a bug.
- [X11] Bugfix: Left shift of int constant relied on undefined behavior (#1951) - [X11] Bugfix: Left shift of int constant relied on undefined behavior (#1951)
- [X11] Bugfix: The OSMesa libray was not unloaded on termination - [X11] Bugfix: The OSMesa libray was not unloaded on termination
- [X11] Bugfix: A malformed response during selection transfer could cause a segfault - [X11] Bugfix: A malformed response during selection transfer could cause a segfault
- [X11] Bugfix: Some calls would reset Xlib to the default error handler (#2108)
- [Wayland] Added dynamic loading of all Wayland libraries - [Wayland] Added dynamic loading of all Wayland libraries
- [Wayland] Added support for key names via xkbcommon - [Wayland] Added support for key names via xkbcommon
- [Wayland] Added support for file path drop events (#2040) - [Wayland] Added support for file path drop events (#2040)

7
src/x11_init.c
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@ -37,6 +37,7 @@
#include <unistd.h> #include <unistd.h>
#include <fcntl.h> #include <fcntl.h>
#include <errno.h> #include <errno.h>
#include <assert.h>
// Translate the X11 KeySyms for a key to a GLFW key code // Translate the X11 KeySyms for a key to a GLFW key code
@ -1095,8 +1096,9 @@ static int errorHandler(Display *display, XErrorEvent* event)
// //
void _glfwGrabErrorHandlerX11(void) void _glfwGrabErrorHandlerX11(void)
{ {
assert(_glfw.x11.errorHandler == NULL);
_glfw.x11.errorCode = Success; _glfw.x11.errorCode = Success;
XSetErrorHandler(errorHandler); _glfw.x11.errorHandler = XSetErrorHandler(errorHandler);
} }
// Clears the X error handler callback // Clears the X error handler callback
@ -1105,7 +1107,8 @@ void _glfwReleaseErrorHandlerX11(void)
{ {
// Synchronize to make sure all commands are processed // Synchronize to make sure all commands are processed
XSync(_glfw.x11.display, False); XSync(_glfw.x11.display, False);
XSetErrorHandler(NULL); XSetErrorHandler(_glfw.x11.errorHandler);
_glfw.x11.errorHandler = NULL;
} }
// Reports the specified error, appending information about the last X error // Reports the specified error, appending information about the last X error

2
src/x11_platform.h
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@ -567,6 +567,8 @@ typedef struct _GLFWlibraryX11
XContext context; XContext context;
// XIM input method // XIM input method
XIM im; XIM im;
// The previous X error handler, to be restored later
XErrorHandler errorHandler;
// Most recent error code received by X error handler // Most recent error code received by X error handler
int errorCode; int errorCode;
// Primary selection string (while the primary selection is owned) // Primary selection string (while the primary selection is owned)