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Fix child process stdio data loss with slow piped consumers #7185

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Fix child process stdio data loss with slow piped consumers #7185

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3cfdf58
child-process: add stdio flush testcase with pipes
petrosagg Jun 7, 2016
b7d3f32
child-process: fix data loss with slow piped consumers
petrosagg Jun 7, 2016
f179bb6
test: fix testcase to actually detect regression
petrosagg Jun 7, 2016
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test: fix testcase to actually detect regression 
In order for the testcase to fail, the calls to read() must be done
after 'exit' is emitted and after flushStdio has been called.

With this change, the testcase will catch any regressions on this
issue.

Signed-off-by: Petros Angelatos <petrosagg@gmail.com>
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petrosagg committed Jun 7, 2016
commit f179bb6687ab0aee3fd681836f46ef8ac6b0a4c6
8 changes: 5 additions & 3 deletions test/parallel/test-child-process-flush-stdio.js
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Expand Up @@ -24,9 +24,11 @@ function spawnWithReadable() {
spawnWithPipe();
}));
p.stdout.on('readable', function() {
let buf;
while (buf = this.read())
buffer.push(buf);
setImmediate(() => {
let buf;
while (buf = this.read())
buffer.push(buf);
});
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@addaleax addaleax Jun 7, 2016

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Why is this change necessary?

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@petrosagg petrosagg Jun 7, 2016

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This testcase was added to cover the issue fixed here: balena-io-experimental@12274a5

But the testcase passes even if the change of that commit is reverted. So I just fixed the testcase to reflect what was actually fixed there.

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@petrosagg petrosagg Jun 7, 2016

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Will PR this separately

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@addaleax addaleax Jun 7, 2016 •
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@petrosagg Can confirm that this test case worked even before 12274a5 – nice catch! A separate PR seems like a good idea, yep

});
}

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