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[3.13] gh-157672: Keep Python's signal handlers when Tk is initialized on macOS (GH-157673) - #157989
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… on macOS (pythonGH-157673) Tk on macOS replaces the SIGINT, SIGHUP and SIGTERM handlers with its own, which exits the process, so Ctrl-C terminated a tkinter program instead of raising KeyboardInterrupt. Save the handlers installed by Python before Tk_Init() and restore them after it. This affects Tk 8.6.11 to 8.6.18 and 9.0 to 9.0.4. Tk itself is fixed in 8.6.19 and 9.0.5. (cherry picked from commit 4532b36)
On 3.13 there was no Tkinter_TkInit(), and tkappinit.c, which is used when Python is built with WITH_APPINIT (as on macOS), called Tk_Init() directly, bypassing the fix.
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Tk on macOS replaces the SIGINT, SIGHUP and SIGTERM handlers with its own, which exits the process, so Ctrl-C terminated a tkinter program instead of raising KeyboardInterrupt. Save the handlers installed by Python before
Tk_Init()and restore them after it.This affects Tk 8.6.11 to 8.6.18 and 9.0 to 9.0.4. Tk itself is fixed in 8.6.19 and 9.0.5.
(cherry picked from commit 4532b36)
Manual backport: this branch has no
Tkinter_TkInit()wrapper, so the helper is added and bothTk_Init()call sites go through it.