linux-kernel - clone and waitpid syscall: return strange error

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Message-Id: <200704152141.47138.yantux@yandex.ru>
Date:	Sun, 15 Apr 2007 21:41:47 -0600
From:	yantux <yantux@...dex.ru>
To:	Linux List <linux-kernel@...r.kernel.org>
Subject: clone and waitpid syscall: return strange error

Help my please.

Question about "interactive" clone and waitpid syscalls.

Describe.
Process was create five a process using clone syscall.
Two clone calling with CLONE_THREAD, other three without CLONE_THREAD.

After then process was calling waitpid(getpid, &status, __WNOTHREAD),
then it must not checkout process, that was created by clone with 
CLONE_THREAD, is not it?

Questions.
Where define thread_info struct?
Where define list_head struct?

I right understand, that in kernel/fork.c, copy_process() function add process 
to thread group?
//1171 string number
list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group);

And do_wait contain next_thread too, but waitpid(getpid(), &status, __WALL) it 
is good, but really waitpid syscall not return info about thread, because 
return error "no child process".
I sure that is not right, or I delusion? I waiting from waitpid info about 
thread, but not error.

Best regards,
yantux.
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