[dtrace-discuss] Is it possible to using DTrace to track probes in dynamic linker library which is used during a process is running?

[Nan Xiao via dtrace-discuss]

Hi all,

        my application will use dlopen to open a dynamic linker library, so how 
can I use DTrace to track this library's probes?

        I know if the dynamic libraries has been identified during link stage, 
it is easy. such as:
        bash-3.2# ldd ./exclude
        libpthread.so.1 =>       /lib/libpthread.so.1
        libodbc.so.2 =>  /usr/local/lib/libodbc.so.2
        librt.so.1 =>    /lib/librt.so.1
        libc.so.1 =>     /lib/libc.so.1
        libiconv.so.2 =>         /usr/local/lib/libiconv.so.2
        libthread.so.1 =>        /lib/libthread.so.1
        libgcc_s.so.1 =>         /usr/local/lib/libgcc_s.so.1
                ......
                
        dtrace -ln 'pid$target:libodbc.so::entry{}' -c ./exclude
        ID   PROVIDER            MODULE                          FUNCTION NAME
        57379     pid777  libodbc.so.2.0.0                    SQLDataSources 
entry
        57380     pid777  libodbc.so.2.0.0                   SQLDataSourcesA 
entry
        ......
        
        
        But if the dynamic library is opened in the running, like this:
        
        dtrace -ln 'pid$target:libmyodbc5.so::entry{}' -c ./exclude
        ID   PROVIDER            MODULE                          FUNCTION NAME
        dtrace: failed to match pid791:libmyodbc5.so::entry: No probe matches 
description
        
        Is it possible? Thanks very much in advance!

Best Regards
Nan Xiao

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