Hi,
i have a doubt regarding linking of libraries in c program
> lets say i have a hello.c C program and hello is executable file
> correspoding to this.
>
> i read that if libraries are linked dynamically then size of executable
> file hello is smaller as compared to the size of executable if libararies
> are linked statically .
it wd be kind if you accept this ques and answer it
hi all i know its not directly related to kernel ...but its the doubt i got
while kernel programming only ..its in c langugage
Yeah your right. static libraries linked at compile-time and external
functions and variables which are resolved at compile-time. where as dynamic
libraries are loaded at run-time with dlopen() system call.
*dlopen()* :subroutine is used to open a shared object, and dynamically
map it into the running programs address space.
*dlsym()* : routine to search for symbols in the loaded shared object.
> *dlclose() *: subroutine is used to remove access to a shared object that
> was loaded into the processes' address space
with the dlopen subroutine.
>
> in my opinion that means that in case of dynamic linked library hello does
> not contain libraries with it it is just linked with them.
> may be hello contain references to symbols ...where they are present in
> linked libraries.
> dlsym() obtain the address of a symbol defined in dynamic library .
>
> now suppose i transfer this hello file to some other machine but same
> platform which doesnt contain these libraries ....will it work there ?
> i hope it shd not
No it will not work. dlopen will fail.
>
> but i have heard ppl say that executable file is complete in itself and it
> works taken anywhere on same platform.
>
> pl clarify ..
> where i m wrong i know there is some fault in my understanding of linking
> concept but unable to clarify it from google...
> --
> Thanks & Regards
> Nidhi
>
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Thanks & Regards,
Rajath N R
