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Implement function cgroupid(path) -> cgroup id #170

Merged
merged 4 commits into from Oct 16, 2018
Merged

Implement function cgroupid(path) -> cgroup id #170

merged 4 commits into from Oct 16, 2018

Commits on Oct 16, 2018

  1. Add helper macros for wrapping annoying C types 

    We will wrap the file_handle struct in the next commit. The struct has
a flexible array member, which is not supported by C++. Compiler may
complain about using it when allocated on stack, even indirectly as a
member of a struct. I'm not sure if using this kind of types is even a
defined behavior…
    @krnowak
    krnowak committed Oct 16, 2018
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  2. Implement function cgroupid()

    @alban @krnowak
    alban authored and krnowak committed Oct 16, 2018
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  3. Support resolving cgroupid only if name_to_handle_at exists 

    Currently used image of alpine has a version of musl libc that does
not have name_to_handle_at function that is required to resolve the
cgroup id. In such case we just use an implementation that says that
resolving cgroupid is not supported.
    @krnowak
    krnowak committed Oct 16, 2018
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  4. Update reference documentation 

    Mention the `cgroup` variable and the `cgroupid` function alongside an
example that uses them both.
    @krnowak
    krnowak committed Oct 16, 2018
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