thanks a lot to all of you ... Nidhi On Tue, Dec 16, 2008 at 12:44 PM, Rajath N R <rajat...@gmail.com> wrote:
> 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 >> > > C Language technical discussion & FAQ > Group Email Addresses Post message: c-fo...@yahoogroups.co.in Subscribe: > c-forum-subscr...@yahoogroups.co.in Unsubscribe: > c-forum-unsubscr...@yahoogroups.co.in > > > -- > Thanks & Regards, > Rajath N R > -- Thanks & Regards Nidhi
