Changes between Initial Version and Version 5 of Ticket #103


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Timestamp:
Aug 27, 2006, 2:20:23 PM (18 years ago)
Author:
bird
Comment:

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  • Ticket #103

    • Property Severity changed from critical to normal
    • Property Summary changed from Exit list handlers registered from dll are not released on DosFreeModule to libc: atexit() callbacks in dlls are called after dlclose()/DosFreeModule() on the DLL
    • Property Version changed from 0.6.1 to 0.6
    • Property Keywords dlclose DosFreeModule atexit on_exit added

  • Ticket #103 – Description

    initial v5  
    1 Scenario: a DLL register an exit list function using atexit() and the dll is loaded using DosLoadModule; when the executable calls DosFreeModule, the exit list handler is not executed nor removed from the list of callbacks.
    2 When the executable terminates, it tries to call the dll exit callback and a crash occurs since the dll code is already unloaded from memory.
    3 
    4 This doesn't happen when the dll is linked at compile time.
    5 
    6 Testcase attached.
     1Use {{{atexit()/on_exit()}}} to register a callback residing in a dynamically loaded DLL. Then unload the DLL. When {{{exit()}}} eventually is called, the application crashes because the callback code isn't there anylonger.