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https://issues.apache.org/jira/browse/MESOS-5880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alex Clemmer updated MESOS-5880:
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Summary: Semantics of `environment` differ across Windows and POSIX (was:
Make `environment` semantics uniform across Windows and POSIX)
> Semantics of `environment` differ across Windows and POSIX
> ----------------------------------------------------------
>
> Key: MESOS-5880
> URL: https://issues.apache.org/jira/browse/MESOS-5880
> Project: Mesos
> Issue Type: Bug
> Components: stout
> Reporter: Alex Clemmer
> Assignee: Alex Clemmer
> Labels: mesosphere, stout
>
> Preliminary investigation shows that our current Windows implementations of
> `os::environment`, `os::setenv`, and `os::getenv` fail to set flags in some
> cases. This leads to test failures on Windows in:
> * `flags_tests.cpp` (MESOS-3437), namely `LoadFromEnvironment`
> * `os_tests.cpp` (MESOS-3441), namely `Environment`
> A preliminary investigation shows:
> * These failures occur because the C standard API for environment variables
> are incompatible. That is, `os::environment` uses the C standard
> implementation of the `environ` macro, while `os::setenv` and `os::putenv`
> use the Win32 APIs for environment variables, like `GetEnvironmentVariable`
> and `SetEnvironmentVariable`. But, `SetEnvironmentVariable` does not affect
> the environment reported by `environ`, so updates are not reflected when we
> call `os::environ`.
> * It is unlikely we will want to use the C equivalents of the
> `Get/SetEnvironmentVariable`, (that is, `setenv_s` and friends), because they
> have different behavior on Windows than on other libc implementations.
> Specifically, on Windows `setenv_s("yourvar", "")` unsets the variable
> `yourvar`, while on other implementations, it sets the value of `yourvar` to
> be the empty string.
> * But, transitioning to a pure Win32 implementation (i.e., one using
> `Set/GetEnvironmentVariable`, `GetEnvironmentStrings`, etc.), probably
> requires changing or getting rid of `os::environment*` APIs. Specifically,
> `os::raw::environment` and `os::environmentp` will probably be eliminated.
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