Setting a Breakpoint in a Dynamically Linked Library

dbx provides full debugging support for code that makes use of the programmatic interface to the run-time linker; code that calls dlopen(), dlclose() and their associated functions. The run-time linker binds and unbinds shared libraries during program execution. Debugging support for dlopen()/dlclose() allows you to step into a function or set a breakpoint in functions in a dynamically shared library just as you can in a library linked when the program is started.

There are three exceptions:

• You cannot set a breakpoint in a library loaded by dlopen()before that library is loaded by dlopen().

• You cannot set a breakpoint in a filter library loaded by dlopen() until the first function in it is called.

• When a library is loaded by dlopen(), an initialization routine named _init() is called. This routine may call other routines in the library. dbx cannot place breakpoints in the loaded library until after this initialization is completed. You cannot have dbx stop at _init() in a library loaded by dlopen().