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39c9f10639
When trying to dump the tree of all cgroups under a given root node,
bpftool attempts to query programs of all available attach types. Some
of those attach types do not support queries, therefore several of the
calls are actually expected to fail.
Those calls set errno to EINVAL, which has no consequence for dumping
the rest of the tree. It does have consequences however if errno is
inspected at a later time. For example, bpftool batch mode relies on
errno to determine whether a command has succeeded, and whether it
should carry on with the next command. Setting errno to EINVAL when
everything worked as expected would therefore make such command fail:
# echo 'cgroup tree \n net show' | \
bpftool batch file -
To improve this, reset errno when its value is EINVAL after attempting
to show programs for all existing attach types in do_show_tree_fn().
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.