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Similarly to recently added legacy kprobe attach interface support through tracefs, support attaching uprobes using the legacy interface if host kernel doesn't support newer FD-based interface. For uprobes event name consists of "libbpf_" prefix, PID, sanitized binary path and offset within that binary. Structuraly the code is aligned with kprobe logic refactoring in previous patch. struct bpf_link_perf is re-used and all the same legacy_probe_name and legacy_is_retprobe fields are used to ensure proper cleanup on bpf_link__destroy(). Users should be aware, though, that on old kernels which don't support FD-based interface for kprobe/uprobe attachment, if the application crashes before bpf_link__destroy() is called, uprobe legacy events will be left in tracefs. This is the same limitation as with legacy kprobe interfaces. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210921210036.1545557-5-andrii@kernel.org
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.