c4a2c7362e
See #1698: Properly write large payloads to journal. I'd appreciate a very careful review; this cmsg stuff is nasty, and while it's well documented in `cmsg(3)` I had to fiddle a bit because the corresponding functions in libc aren't const and thus don't permit a direct allocation of the buffer as most `cmsg` C code around does. Closes #1698 ## Motivation Linux limits the maximum amount of data permitted for a single Unix datagram; sending large payloads directly will fail. ## Solution Follow systemd.io/JOURNAL_NATIVE_PROTOCOL/ and check for `EMSGSIZE` from `send()`; in this case write the payload to a memfd, seal it, and pass it on to journald via a corresponding SCM_RIGHTS control message. Per discussion in #1698 this adds no dependency on `nix`, and instead implements fd forwarding directly with some bits of unsafe `libc` code.
tracing-journald
Support for logging tracing events natively to journald,
preserving structured information.
Overview
tracing is a framework for instrumenting Rust programs to collect
scoped, structured, and async-aware diagnostics. tracing-journald provides a
tracing-subscriber::Layer implementation for logging tracing spans
and events to systemd-journald, on Linux distributions that use
systemd.
Compiler support: requires rustc 1.42+
Supported Rust Versions
Tracing is built against the latest stable release. The minimum supported version is 1.42. The current Tracing version is not guaranteed to build on Rust versions earlier than the minimum supported version.
Tracing follows the same compiler support policies as the rest of the Tokio project. The current stable Rust compiler and the three most recent minor versions before it will always be supported. For example, if the current stable compiler version is 1.45, the minimum supported version will not be increased past 1.42, three minor versions prior. Increasing the minimum supported compiler version is not considered a semver breaking change as long as doing so complies with this policy.
License
This project is licensed under the MIT license.
Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Tracing by you, shall be licensed as MIT, without any additional terms or conditions.