Re: [uml-devel] Re: Stop at startup on 2.6 NPTL hosts

[Bodo Stroesser <bstroesser@fujitsu-siemens.com>]

Bodo Stroesser wrote:
> Adam Heath wrote:
> 
>> On Tue, 9 Nov 2004, Bodo Stroesser wrote:
>>
>>
>>> To work around, we could use the by-hand-syscall for os_getpid(). I 
>>> didn't test it,
>>> but I'm quite shure, that it fixes the problem.
>>
>>
>>
>> That would mean each arch has separate asm blocks.  Why not just use the
>> _syscall macros?
> 
> Yes, I agree.
> But before doing any workaround, we should try to get a fixed lib!
> 
Meanwhile I did a test and created a patch for the problem. It's a
workaround only, since I think, the lib should be fixed. But it
works fine linked with NPTL and static, so it could stay with a fixed
lib anyway.

#####################

From: Bodo Stroesser <bstroesser@fujitsu-siemens.com>

Using NPTL, getpid() sometimes delivers the wrong pid, since it
uses a buffered one from previous calls. This buffered pid isn't
discarded, when a child is created by a clone().
So, as a workaround, UML should use a direct kernel call to bypass
the lib.

Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
---

--- a/arch/um/os-Linux/process.c	2004-11-09 18:16:07.149159600 +0100
+++ b/arch/um/os-Linux/process.c	2004-11-09 18:40:43.723686152 +0100
@@ -107,6 +107,8 @@ void os_usr1_process(int pid)
  	kill(pid, SIGUSR1);
  }

+inline _syscall0( pid_t, getpid)
+
  int os_getpid(void)
  {
  	return(getpid());


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