> > If we do the following > > static int x; // in file1.c > > and > > extern int x; // in file2.c > > wouldn't the linker complain when the 2 object files are linked to > generate the .o for the module? Shouldn't specifying some variable as > static hide that variable from other source files. In the above case, I > agree that x will not be exported, but will the module even build > successfully? It will. but will fail during loading! > > -Vishwas. > > > > Mike DeKoker wrote: > > > Yes, you'll end up having a local symbol for the > > static declaration and an undefined exported symbol > > for the extern declaration. The local symbol is not > > exported by definition. The undefined exported symbol > > cannot be exported because there is no object (i.e. > > variable or function) to which it is bound. > > > > -Mike DeKoker > > > > --- "Sponsel Carsten (ext)" > > <carsten.sponsel@erln.gepas.de> wrote: > > > >>But then I've two symbols when i view my module with > >>nm... > >> > >>-----Original Message----- > >>From: Mike DeKoker [mailto:mdekoker@yahoo.com] > >>Sent: Freitag, 13. Februar 2004 18:20 > >>To: Sponsel Carsten (ext) > >>Subject: Re: global Variable in multiple files > >> > >> > >>Just define your variable as a module-level static > >>and > >>define an external reference to it in the other > >>source > >>files. This works for functions also. > >> > >>e.g. > >> > >>/* File1.c */ > >>static int x; > >> > >>/* File2.c */ > >>extern int x; > >> > >>This assumes that File1.o and File2.o are being > >>relocatably linked into a single object file. (Since > >>you're coding for a module they should be.) > >> > >>-Mike DeKoker > >> > >>--- "Sponsel Carsten (ext)" > >><carsten.sponsel@erln.gepas.de> wrote: > >> > >>>Hi friends, > >>> > >>>it might be a simple question: > >>> > >>>What's the best way to get (to define) a global > >>>variable which can be used in multiple files of a > >>>kernel module in Linux Kernel 2.6? The variable > >>>should not be exported as a symbol. In my special > >>>problem I need an array of a struct which is > >> > >>useable > >> > >>>in all sourcefiles which form my kernel module. > >>> > >>>thanks, > >>>Carsten > >>> > >> > >>snip > >> > >>__________________________________ > >>Do you Yahoo!? > >>Yahoo! Finance: Get your refund fast by filing > >>online. > >>http://taxes.yahoo.com/filing.html > > > > > > > > __________________________________ > > Do you Yahoo!? > > Yahoo! Finance: Get your refund fast by filing online. > > http://taxes.yahoo.com/filing.html > > > > -- > > Kernelnewbies: Help each other learn about the Linux kernel. > > Archive: http://mail.nl.linux.org/kernelnewbies/ > > FAQ: http://kernelnewbies.org/faq/ > > > > > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
