On Tuesday 10 March 2009 11.04.41 Michael Unterkalmsteiner wrote:
> On Tuesday 10 March 2009 00.32.40 Khem Raj wrote:
> > > /* uClinux-2.0 has vfork, but Linux 2.0 doesn't */
> >
> > You should check if you are using right kernel headers while building
> > uclibc.
>
> Since I'm using buildroot I guess the kernel headers configured there are
> used: BR2_KERNEL_HEADERS_2_6_28=y
> BR2_DEFAULT_KERNEL_HEADERS="2.6.28.4"
Ok, I've investigated this a bit... but I'm not sure if what I found out is
true, so if someone could please confirm I'd be glad :-)
1. The fork syscall is not implemented on nommu systems:
>From linux-source-2.6.28/Documentation/nommu-mmap.txt
"Memory mapping behaviour also involves the way fork(), vfork(),
clone() and
ptrace() work. Under uClinux there is no fork(), and clone() must be
supplied
the CLONE_VM flag."
2. The kernel headers (2.8.28.4) do NOT define __NR_vfork
linux-2.6.28.4/arch/mips/include/asm/unistd.h:
[...]
/* whitelists for checksyscalls */
#define __IGNORE_select
#define __IGNORE_vfork
[...]
3. Ergo the compilation fails since __NR_vfork is indeed not defined and fork()
is neither.
How to solve that?
Thanks,
Michael
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