reverse engineering - How do you debug libc in OSX? -

-

i expect able statically link against build of libc debug symbols, run program through lldb.

otool -l <my binary>

makes dynamically linked library (dll) is:

/usr/lib/libsystem.b.dylib (compatibility version 1.0.0, current version 1226.10.1)

which guess libc dll (though nm doesn't list i'd expect in libc). maybe kind of stub loader.

in /usr/lib/ seems apple not supply debug build of libsystem.

how debug libc on osx (10.11.3)?

possible duplicate of: on mac os x, how can debug build of system/libc source level debugging?

i'm having hard time following question, there points made think cover you're asking:

otool -l show dylibs linking against.

/usr/lib/libsystem.b.dylib umbrella library re-exports multiple dylibs, including libc (/usr/lib/system/libsystem_c.dylib). if want see symbols part of system's c runtime, want use nm on dylib, not libsystem.

if statically linking in own libc, won't show in 'otool -l' because it's static library , part of executable.

if staticy linked own libc executable, using nm on binary possibly not show symbols expecting because linker optimize away dead code not needed executable. can ensure added using -force_load option ld. check out ld man page more details on that.


Comments

Post a Comment

Popular posts from this blog

c# - How Configure Devart dotConnect for SQLite Code First? -

-
can configure following sample code ? when run following code, error : no entity framework provider found ado.net provider invariant name 'devart.data.sqlite' setting in machine.config <system.data> <dbproviderfactories> <add name="dotconnect sqlite" invariant="devart.data.sqlite" description="devart dotconnect sqlite" type="devart.data.sqlite.sqliteproviderfactory, devart.data.sqlite, version=4.6.287.0, culture=neutral, publickeytoken=09af7300eec23701" /> </dbproviderfactories> </system.data> after add below block code in app.config <?xml version="1.0"?> <configuration>   <configsections> <!-- more information on entity framework configuration, visit http://go.microsoft.com/fwlink/?linkid=237468 --> <section name="entityframework" type="system.data.entity.internal.configfile.entityframeworksection, entit...
Read more

java - Copying object fields -

-
what best way of copying classes when need have 2 independent variables? have simple class: public class myclass { boolean = false; string b= "not empty"; } do need make method : assign(myclass data ) { a= data.a; b= data.b; } is there automatic method copy (duplicate) objects in java? do need make method : pretty close. instead of making method, should make constructor. such constructors called copy constructor , , create them this: myclass(myclass data) { = data.a; b = data.b; } and create copy of instance, use constructor this: myclass obj1 = new myclass(); myclass obj2 = new myclass(obj1); copy constructor can tedious : using copy constructor create deep-copy can tedious, when class has mutable fields. in case, assignment create copy of reference, , not object itself. have create copy of fields (if want deep copy). can go recursive. a better way create deep copy serialize , deserialize object. why not use clone()? ...
Read more

c++ - Clear the memory after returning a vector in a function -

-
i have function processes , stores lot of data in , returns results vector of class. amount of data stored in function tremendous , want clear storage memory of function after finished job. necessary (does function automatically clear memory) or should clear memory function? update: vector<customers> process(char* const *filename, vector<int> id) { vector<customers> list_of_customers; (perform actions) return list_of_customers; } variables defined locally within function automatically released @ end of function scope. destructors objects called, should free memory allocated objects (if objects coded correctly). example of such object std::vector . anything you've allocated new must have corresponding delete release storage. try avoid doing own allocation , use raii instead, i.e. containers or smart pointers.
Read more