I did some more digging and I found that I was wrong before: every child
process I create through NB is killed immediately and becomes a zombie (that's
why it ignored the kill). Once I had that information I implemented the
waitpid() call and can now cleanup my zombie children.
This would also explain (at least to my mind) why the child code (pid = 0
ifTrue: [ … ]) is never executed.
Now, my question is, who terminates my child processes?
The processes are terminated with SIGABRT; all of the above also applies to
vfork(). I found that there's a crash report being generated for that aborted
process so I'm attaching it here, maybe you'll see something I missed.
Max
Process: NBCog [36367]
Path: /Users/USER/*/NBCog.app/Contents/MacOS/NBCog
Identifier: NBCog
Version: NBCog VM 6.0-pre (21.0)
Code Type: X86 (Native)
Parent Process: NBCog [36341]
User ID: 501
Date/Time: 2012-11-23 16:17:42.083 +0100
OS Version: Mac OS X 10.8.2 (12C60)
Report Version: 10
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Application Specific Information:
*** multi-threaded process forked ***
abort() called
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x94ce33ba __kill + 10
1 libsystem_kernel.dylib 0x94ce24bc kill$UNIX2003 + 32
2 libsystem_c.dylib 0x91df4527 abort + 215
3 org.squeakfoundation.Squeak 0x0008ab6f error + 95
Thread 0 crashed with X86 Thread State (32-bit):
eax: 0x00000000 ebx: 0x0008ab1a ecx: 0xbff5cb0c edx: 0x94ce33ba
edi: 0x91df445d esi: 0xbff5cb44 ebp: 0xbff5cb28 esp: 0xbff5cb0c
ss: 0x00000023 efl: 0x00000282 eip: 0x94ce33ba cs: 0x0000000b
ds: 0x00000023 es: 0x00000023 fs: 0x00000000 gs: 0x0000000f
cr2: 0xac30602c
Logical CPU: 0
Binary Images:
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On 22.11.2012, at 17:22, Max Leske <[email protected]> wrote:
>
> On 22.11.2012, at 17:00, Igor Stasenko <[email protected]> wrote:
>
>> On 22 November 2012 16:34, David T. Lewis <[email protected]> wrote:
>>> On Thu, Nov 22, 2012 at 04:04:00PM +0100, Max Leske wrote:
>>>>
>>>> On 22.11.2012, at 12:28, Igor Stasenko <[email protected]> wrote:
>>>>
>>>>> On 22 November 2012 11:19, Max Leske <[email protected]> wrote:
>>>>>> I have run into a small problem with fork():
>>>>>>
>>>>>> pid := self primitiveRun.
>>>>>> pid isZero
>>>>>> ifTrue: [ "child code with exec" ]
>>>>>> ifFalse: [ "parent code" ]
>>>>>>
>>>>>> primitiveRun
>>>>>> <primitive: #primitiveNativeCall module: #NativeBoostPlugin>
>>>>>> ^ self nbCall: #( int fork() )
>>>>>>
>>>>>> Only the parent code is ever executed, #pid is never 0.
>>>>>
>>>>> are you sure about that?
>>>>> if you evaluate
>>>>> self fork
>>>>> it will always answer non-zero.. because it is parent process,
>>>>> where you observing result.
>>>>> But that doesnt means that there is no child process which observes
>>>>> different return value.
>>>>
>>>> Assuming that I wouldn't be able to observer when #pid is 0, then the
>>>> following should still work:
>>>>
>>>> pid := self primitiveRun.
>>>> pid isZero
>>>> ifTrue: [ StandardFileStream forceNewFileNamed: 'foo.log' ]
>>>> <-----------------------
>>>> ifFalse: [ "parent code" ]
>>>>
>>>> The file 'foo.log' is never created.
>>>>
>>>> The UnixOSProcessPlugin has pretty much the same code:
>>>>
>>>> ((pid := self cCode: 'vfork()') = 0)
>>>> ifFalse:
>>>> [ "child code" ]
>>>> ifTrue:
>>>> [ "parent code" ]
>>>>
>>>> BTW: using vfork() instead of fork() (as OSProcess does) doesn't work
>>>> either (the image hangs as expected but the file 'foo.log' is not created).
>>>>
>>>
>>> Assuming that you are trying to do a fork followed by exec,
>
> That's the plan, although I'll have to do some stuff with the pipes before
> exec'ing.
>
>>> you will want to
>>> do the exec immediately after the fork. This may introduce some
>>> complications
>>> when you do it as two FFI calls, because your child process is still running
>>> Smalltalk on the VM, and it needs to keep running long enough to the second
>>> FFI call. Opening a new file stream on 'foo.log' implies a *lot* of
>>> processing
>>> in the child VM, so I am not surprised that this does not work.
>>>
>>> You might try just making a little "hello world" C program, and see if you
>>> can exec that program after doing the fork. That would be a lot less
>>> processing
>>> for your child VM, so it may have a better chance of working. But you still
>>> may have a few issues to sort out in keeping the child VM running long
>>> enough
>>> to get the the exec FFI call.
>>>
>
> Ok. Not quite sure how that all works but I tried to come up with a program
> that is as short as possible:
>
> run
> | pid args |
> args := (LimboCommand new
> command: '/bin/echo';
> arguments: { 'foo' })
> primitiveArguments.
> pid := self primitiveRun.
> pid isZero
> ifTrue: [ self primitiveExecv: args first arguments: args ]
> ifFalse: [ "parent code" ].
>
> Still not working. fork() does create the child process but it won't exec
> (because it never reaches that point in execution somehow) and I can't kill
> the child process on the command line (have to close the image; the childs
> are not zombies)
>
>>
>> aye... and with a bit of assembler black magic you can actually
>> generate a code to call
>> those two functions in same primitive, so you don't leave to interpreter at
>> all.
>
> Cool :) Will be my last resort though.
>
> Regarding the "hanging" image: yes the child process is created but as the
> man page for fork() states that the parent will be suspended until the child
> is exec'ed. Therefore, having the image "hang" is expected because I can't
> exec the child.
>
>
> Thanks for the help guys.
>
> Max
>
>>
>> bit still it would be nice if it could work using two separate FFI calls.
>>
>>> Dave
>>>
>>>>
>>>>>
>>>>>> Looking at UnixOSProcessPlugin I see that there are some special things
>>>>>> Dave did before forking and I'm wondering if these would be necessary
>>>>>> with NB. In the method #forkAndExecInDirectory:
>>>>>> 1. possible use of a sig handler
>>>>>> 2. special secure mode handling (what's that?)
>>>>>> 3. turn off the interval timer
>>>>>>
>>>>>> Any ideas?
>>>>>>
>>>>>> Cheers,
>>>>>> Max
>>>>>>
>>>>>> On 21.11.2012, at 08:50, Max Leske <[email protected]> wrote:
>>>>>>
>>>>>>>
>>>>>>> On 20.11.2012, at 21:56, David T. Lewis <[email protected]> wrote:
>>>>>>>
>>>>>>>> On Mon, Nov 19, 2012 at 05:46:14PM -0300, Igor Stasenko wrote:
>>>>>>>>>
>>>>>>>>> Providing bindings to fork/pipe kernel functions is piece of cake.
>>>>>>>>> But writing a wrapper around it would be a bit of work.. but still it
>>>>>>>>> is possible. And you should try.
>>>>>>>>>
>>>>>>>>> And yes, using fork() stuff having many treacherous pitfalls, but
>>>>>>>>> don't think that if you call this function from code written in C
>>>>>>>>> instead of NB will make it less treacherous.
>>>>>>>>> I think Dave can give some more input on that, because he also using
>>>>>>>>> fork() in OSProcess.
>>>>>>>>
>>>>>>>> In normal use, the fork() call is immediately followed by an exec(), so
>>>>>>>> it is not tricky at all. The only thing that was tricky to do in
>>>>>>>> OSProcess
>>>>>>>> was forkSqueak() which forks the VM itself and then attempts to
>>>>>>>> continue
>>>>>>>> running. But that is really an unusual use case.
>>>>>>>>
>>>>>>>> The system calls such as fork() and pipe() should work the same whether
>>>>>>>> you are calling from FFI or from generated C in a primitive. You can
>>>>>>>> find examples for many of these calls in OSProcess. In general, the
>>>>>>>> interface to system calls and standard C library functions is in
>>>>>>>> UnixOSProcessPlugin, and the associated glue to tie it into the image
>>>>>>>> is in UnixOSProcessAccessor. I have not looked at it closely but I
>>>>>>>> think that in some cases you could change the methods in
>>>>>>>> UnixOSProcessAccessor
>>>>>>>> to make FFI calls, at least in order to get something working initially
>>>>>>>> (I don't know if the design of OSProcess is what you want, but it could
>>>>>>>> get you started).
>>>>>>>>
>>>>>>> Thanks Dave, that's good to know.
>>>>>>>
>>>>>>> Cheers,
>>>>>>> Max
>>>>>>>
>>>>>>>> Dave
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Best regards,
>>>>> Igor Stasenko.
>>>>>
>>>>
>>>
>>
>>
>>
>> --
>> Best regards,
>> Igor Stasenko.
>>
>
