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It would be nice to be able to redirect stdin/stdout/stderr for individual tasks. #6369

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Thiez opened this issue May 9, 2013 · 2 comments · Fixed by #11353
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It would be nice to be able to redirect stdin/stdout/stderr for individual tasks. #6369

Thiez opened this issue May 9, 2013 · 2 comments · Fixed by #11353
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A-runtime Area: std's runtime and "pre-main" init for handling backtraces, unwinds, stack overflows C-enhancement Category: An issue proposing an enhancement or a PR with one.

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@Thiez
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Thiez commented May 9, 2013

As the title says, this would be a nice feature to have, and could be a part of the new I/O design (#4248).
One possible application would be buffering stdout/stderr of the tests so that any output can appear without being mixed with output from other tests. I'm sure other (useful) applications exist, such as discarding unwanted output from a task.
@toddaaro
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toddaaro commented Jul 3, 2013

Not sure if this will make it in, but it is an idea worth considering as this whole API is changing a lot. Tagged with runtime.

@catamorphism
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Would be nice; not a milestone blocker.

@alexcrichton alexcrichton mentioned this issue Jan 6, 2014
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bors added a commit that referenced this issue Jan 7, 2014
@bors
auto merge of #11353 : alexcrichton/rust/improve-logging, r=brson
7dbd12a 
This will allow capturing of common things like logging messages, stdout prints
(using stdio println), and failure messages (printed to stderr).  Any new prints
added to libstd should be funneled through these task handles to allow capture
as well.

Additionally, this commit redirects logging back through a `Logger` trait so the
log level can be usefully consumed by an arbitrary logger.

This commit also introduces methods to set the task-local stdout handles:

* std::io::stdio::set_stdout
* std::io::stdio::set_stderr
* std::io::logging::set_logger

These methods all return the previous logger just in case it needs to be used
for inspection.

I plan on using this infrastructure for extra::test soon, but we don't quite
have the primitives that I'd like to use for it, so it doesn't migrate
extra::test at this time.

Closes #6369
flip1995 pushed a commit to flip1995/rust that referenced this issue Dec 6, 2020
@bors
Auto merge of rust-lang#6369 - camsteffen:cast-cfg, r=Manishearth
58a2bc4 
Disable unnecessary_cast for cfg-dependant types

changelog: Disable unnecessary_cast for cfg-dependant types

Fix  rust-lang#6331
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A-runtime Area: std's runtime and "pre-main" init for handling backtraces, unwinds, stack overflows C-enhancement Category: An issue proposing an enhancement or a PR with one.
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Support arbitrary stdout/stderr/logger handles alexcrichton/rust
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@Thiez @toddaaro @catamorphism