[Gambas-user] Problem with Process_Read

[Jussi Lahtinen]

I did more testing with latest revision (6679).
I made pure command-line version of the tester and I do not get the crash.
However I get random failing of the test. Sometimes the string is not
returned, instead null string.
The project is attached. Test 239 is disabled, and test 240 reports always
fail because the string gets mangled ("test\n" --> "init_child_tty:
/dev/pts/13\ntest\n") when debugging is on.
However, when you look the output files, you will see that without mangling
only the other case would really fail.

Adjusting the wait value (from 0.1 to 0.5) doesn't make any difference.


Jussi


On Mon, Nov 24, 2014 at 1:15 AM, Jussi Lahtinen <jussi.lahtinen at ...626...>
wrote:

>
> 1) Can you try with revision #6671? It should not change anything, but
>> then we will run exactly the same code.
>>
>
> I did that and nothing seemed to change in regards of this problem, just
> like expected.
>
>
>
> 2) Can you uncomment the line #64 in the
>> '/trunk/main/gbx/gbx_c_process.c' source file before recompiling? That
>> way you will have many debugging message that will allow to know what
>> happens behind the curtain.
>>
>
> I recompiled with the debugging on, but this changed the situation.
> No more crash, but GambasTester gave error 239, which means the content of
> sTest was not "test" as expected.
> Instead the string contains "init_child_tty: /dev/pts/13\ntest\n", so I
> temporarily commented out the return line.
> Still, no more crashing.
> I attached output of non-crashing run, if there is any help from it.
>
> I will investigate more later.
>
>
>
> 3) In the future, will you modify your project to be purely command-line
>> (no dialog, no window, no GUI used at all)? Note that if you use a GUI
>> component, you use its event loop, not the one provided by the
>> interpreter. That may change the behaviour of bugs...
>>
>
> Yes I can do that, but not sure if I have understood this right...
> shouldn't there then be GambasTester for Qt4, GTK+ and for command line?
>
>
>
> Jussi
>
>
-------------- next part --------------
mTest.DoTests.364: This Gambas version is somewhat tested for string errors.
run_process 0xd4ab58: echo 'This Gambas version is somewhat tested for string errors.' | md5sum
init_child()
fork: pid = 25520
watch: out = 3 err = 5
run_process: check child state immediately
run_process: child is OK
Waiting for 25520
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
>> callback_child
Process 25520 has returned 0
stop_process: 0xd4ab58
stop_process_after: 0xd4ab58
callback_error: 5 0xd4ab58
exit_process: 0xd4ab58
unwatch & close: 3
unwatch & close: 5
Raising Kill event for 0xd4ab58: parent = 0xd3df88  can raise = 0
exit_child()
<< callback_child
Waiting for: got it !
Process_free 0xd4ab58
exit_process: 0xd4ab58
run_process 0xd4ab58: echo test
run_process: slave = /dev/pts/12
init_child()
fork: pid = 25523
watch: out = 3 err = -1
run_process: check child state immediately
run_process: child is OK
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
callback_write: 3 0xd4ab58
unwatch & close: 3
>> callback_child
Process 25523 has returned 0
stop_process: 0xd4ab58
stop_process_after: 0xd4ab58
Raising Kill event for 0xd4ab58: parent = 0xd3df88  can raise = 0
exit_child()
<< callback_child
mTest.DoTests.1544: init_child_tty: /dev/pts/12

Process_free 0xd4ab58
exit_process: 0xd4ab58
ERROR: 240
-------------- next part --------------
mTest.DoTests.364: This Gambas version is somewhat tested for string errors.
run_process 0x1060b58: echo 'This Gambas version is somewhat tested for string errors.' | md5sum
init_child()
fork: pid = 25532
watch: out = 3 err = 5
run_process: check child state immediately
run_process: child is OK
Waiting for 25532
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
>> callback_child
Process 25532 has returned 0
stop_process: 0x1060b58
stop_process_after: 0x1060b58
callback_error: 5 0x1060b58
exit_process: 0x1060b58
unwatch & close: 3
unwatch & close: 5
Raising Kill event for 0x1060b58: parent = 0x1053f88  can raise = 0
exit_child()
<< callback_child
Waiting for: got it !
Process_free 0x1060b58
exit_process: 0x1060b58
run_process 0x1060b58: echo test
run_process: slave = /dev/pts/12
init_child()
fork: pid = 25535
watch: out = 3 err = -1
run_process: check child state immediately
run_process: child is OK
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
callback_write: 3 0x1060b58
>> callback_child
Process 25535 has returned 0
stop_process: 0x1060b58
stop_process_after: 0x1060b58
exit_process: 0x1060b58
unwatch & close: 3
Raising Kill event for 0x1060b58: parent = 0x1053f88  can raise = 0
exit_child()
<< callback_child
mTest.DoTests.1544: init_child_tty: /dev/pts/12
test

Process_free 0x1060b58
exit_process: 0x1060b58
ERROR: 240
-------------- next part --------------
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