Issue 23402: dynload_shlib does not close ldl handles when the interpreter is shut down

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This issue has been migrated to GitHub: https://github.com/python/cpython/issues/67591

classification

Title:	dynload_shlib does not close ldl handles when the interpreter is shut down
Type:	behavior	Stage:
Components:	Interpreter Core	Versions:	Python 2.7

process

Created on 2015-02-06 18:21 by Adam, last changed 2022-04-11 14:58 by admin.

Files
File name	Uploaded	Description	Edit
python-dlopen.diff	Adam, 2015-02-06 18:21		review

Messages (2)
msg235490 - (view)	Author: Adam (Adam)	Date: 2015-02-06 18:21
I think dynload_shlib (and maybe some of the other non-ldl dynamic library loaders?) should close the libraries when the interpreter is shut down. Currently the handles are not ever closed and in ldl's case sometimes leaked. The reason I desire this behavior is I have Python opening a shared library that I also open (all within the same process), and I want to be able to reload the library at runtime (via dlclose() + dlopen()) by shutting down the Python interpreter, dlclose()/dlopen(), and re-starting Python on the other side, however having the hanging reference to the library within the interpreter is preventing my dlclose() call from unloading the library. I have attached a patch for dynload_shlib.c that tracks all handles returned by dlopen() and will close them properly when the interpreter is shut down.
msg287380 - (view)	Author: Super Bo (Super Bo)	Date: 2017-02-09 03:19
I think dynload_unload_all() should be called in PyImport_Cleanup() function.