One question about fork, vfork and clone

One question about fork, vfork and clone

[Roy Lee]

Hi,
I'm a kernel newbie and are reading the source code about process
management of kernel-2.11.10
I found it has not only the sys_clone() but also three explict syscalls
in the arch/<ARCH>/kernel/process.c

sys_fork(), sys_vfork(), sys_clone()

is this means the library calls no more wrap the sys_clone() for the
three library call(fork,vfork,clone), but
call the corresponding syscall? or it never did that?

I've also downloaded the source code of glibc-2.3.5, but I'm not
sure where I should I start to figure out this.

Thank you for your reply.

Roy

Re: One question about fork, vfork and clone

[Arnd Bergmann]

On Middeweken 15 Juni 2005 10:17, Roy Lee wrote:
> is this means the library calls no more wrap the sys_clone() for the
> three library call(fork,vfork,clone), but
> call the corresponding syscall? or it never did that?

The sys_vfork and sys_fork entry points are there so old libc versions
can still work. Some architectures that were added after sys_clone
was introduced wrongly copied this code, but new architectures that
get added should just provide sys_clone and have the other calls
implemented as wrappers in libc.

	Arnd <><