Tk Source Code: View Ticket

Ticket UUID:	f3e96942ed0123799d269adbcfa39bb1c1895058
Title:	macOS: TkpInit replaces the SIGINT, SIGHUP and SIGTERM handlers of the application which embeds Tk
Type:	Bug	Version:	trunk
Submitter:		Created on:	2026-09-17 10:08:57
Subsystem:	66. Aqua Window Operations	Assigned To:	aku
Priority:	1 Zero	Severity:	Important
Status:	Closed	Last Modified:	2026-09-22 07:04:54
Resolution:	Fixed	Closed By:	jan.nijtmans
		Closed on:	2026-09-22 07:04:54
Description:	Since [d69b5cecd5] (fix for [c2483bfe4b]), `TkpInit()` on macOS installs `TkMacOSXSignalHandler`, which calls `Tcl_Exit(1)`, for SIGINT, SIGHUP and SIGTERM. It does this unconditionally, so it also replaces handlers installed by the application which embeds Tk. In Python, the SIGINT handler raises `KeyboardInterrupt`. Once a Tk window has been created, Ctrl-C (or SIGINT sent with `pthread_kill()`, which IDLE is going to use to interrupt user code) silently terminates the process with exit status 1 instead. Python-level SIGTERM and SIGHUP handlers stop working as well. Branch mac-signal-handlers ([87fa518cee]) installs the Tk handler only if the previous disposition is `SIG_DFL`, so `wish` behaves as before.
User Comments:	jan.nijtmans added on 2026-09-22 07:04:54: Dup of [989b1ccb98]. Fixed and closed.