[Tcl-bugs] [ tcl-Bugs-1091431 ] Tcl_InitStubs failure crashes wish

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Bugs item #1091431, was opened at 2004-12-26 15:12
Message generated for change (Settings changed) made by kennykb
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Category: 39. Dynamic Loading
Group: None
Status: Open
Resolution: None
Priority: 8
Submitted By: Joe English (jenglish)
>Assigned to: Joe English (jenglish)
Summary: Tcl_InitStubs failure crashes wish

Initial Comment:
On Linux and possibly other ELF-based systems,  the
global variable "tclStubsPtr" defined in tclStubLib.c
may be shared by all extensions.  That is, even though
each shared library includes its own copy of the
variable, the runtime loader will merge all copies into
a single location.

This causes serious problems if Tcl_InitStubs() ever
fails.  For example, if an extension that calls
Tcl_InitStubs(..., "8.5", ...) is loaded into an 8.4
wish, then Tcl_InitStubs() sets tclStubsPtr to NULL,
causing wish to immediately crash (if, as is the usual
case, Tk was compiled with -DUSE_TCL_STUBS).


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Comment By: Don Porter (dgp)
Date: 2004-12-28 21:21

Message:
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Is Feature Request 540378 relevant here?

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Comment By: Joe English (jenglish)
Date: 2004-12-26 15:37

Message:
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Attached patch to generic/tclStubLib.c attempts to fix the
problem.  Unfortunately it can't really work without
retroactively patching all the existing copies of wish8.4;
when an extension that calls Tcl_InitStubs() is loaded into
wish8.4, the runtime loader will use the copy of
Tcl_InitStubs from libtk8.4.so, not the one from the
extensions' library.



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