[Octave-bug-tracker] [bug #43036] popen2 on Windows fails quietly if command writes to stderr

[Tatsuro MATSUOKA]

Follow-up Comment #12, bug #43036 (project octave):

Before trying to the patch by Mike, I would like to know what is expected
behavior.

I have executed popen2_bug2.m with echo_bug2.bat on windows (4.0.2)


>> popen2_bug2
EAGAIN =  11
EINVAL =  22
in =  4
out =  3
pid =  3040
<waiting> (win32), s=-1, errno=22
Hello 1
Hello 2
Hello 3
NOW WE TALK TO STDERR...
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
<waiting> (somewhere), s=-1, errno=0
no many waits, breaking out



I have executed the similar on octave on Cygwin (4.0.1) which has
posix popen2.

I have generated echo_bug2.sh as

echo Hello 1
echo Hello 2
echo Hello 3

echo NOW WE TALK TO STDERR...
echo hello stderr 1>&2
echo Betcha will not see this!

echo Hello 4
echo Hello 5
echo Hello 6
echo Goodbye

(I have modified "won't" to "will not" to kill a single quotation mark.)

and use


[in, out, pid] = popen2 ('./echo_bug2.sh')


instead of 

[in, out, pid] = popen2 ('echo_bug2.bat')


The result of Cygwin


EAGAIN =  11
EINVAL =  22
in =  12
out =  13
pid =  8616
<waiting> (unix), s=-1, errno=11
hello stderr
Hello 1
Hello 2
Hello 3
NOW WE TALK TO STDERR...
Betcha will not see this!
Hello 4
Hello 5
Hello 6
Goodbye
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
<waiting> (unix), s=-1, errno=11
no many waits, breaking out


For octave for windows
Is
<waiting> (win32), s=-1, errno=0
expected but not
<waiting> (somewhere), s=-1, errno=0
?
Am I right?

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