Thank you for your help. Maybe my expression was not enough. I can understand how to add the system call into the kernel. All I have to do is to add proper descriptions into unistd.h, entry.S and use _syscallX() macros. The thing I want to know is how the libc calls do_fork(). do_fork() has one parameter related to registers but fork() doesn't have any parameter. So I want to know how the fork() set the parameter. And to confirm it, I want the source code of fork(). Regards, Shinpei Kato On Thu, 11 Dec 2003 09:36:09 -0800 (PST) Karthik M <k_mohanas@yahoo.com> wrote: > > > Hi, > > Yes, from our programs we call fork() which is a > system call and all system call implementation will > have the format of : > > sys_<system_call_name> > > So, do_fork() is the actual fork implementation > whereas you can think of sys_fork() as a wrapper > program. You can implement your own system call very > easily. Just search for "adding a system call" in > google and you will come across a lot of articles. > > hope this helps > > Karthik > > --- shinny@j02.itscom.net wrote: > > Hi, all > > > > This question may be really basic though, > > I'm studying how the linux creates a process and > > schedules it on 2.6 at the moment. > > The core function to create a process seems to be > > do_fork() in kernel/fork.c. > > And do_fork() is called from sys_fork() or > > sys_clone(). > > But we usually use fork() not sys_fork(), don't we? > > So I downloaded the latest libc(glibc-2.3.2) source > > and looked for fork(). > > However there are several functions and files that > > are likely to be fork(). > > Which fork() in which file is the real we call from > > our program? > > > > Regards, > > Shinpei Kato > > -- > > Kernelnewbies: Help each other learn about the Linux > > kernel. > > Archive: > > http://mail.nl.linux.org/kernelnewbies/ > > FAQ: http://kernelnewbies.org/faq/ > > > > > __________________________________ > Do you Yahoo!? > Free Pop-Up Blocker - Get it now > http://companion.yahoo.com/ > -- > 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/
