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18 The latter is what this document is about: if you are developing a program and
22 API that implements the client side of this protocol. This document explains
23 what this interface does behind the scenes, in case you'd like to implement a
32 `systemd-journald.service` listens. Each datagram sent to this socket
35 sent over this socket may come in one of two formats:
49 payload, but if this fails with an `EMSGSIZE` error it would immediately retry
72 byte. In this case, the key name is serialized as is, followed by a `\n`
75 `\n`. Example: a key `FOO` with a value `BAR` may be serialized using this
83 are easily recognized and understood by the human eye this way, without any
109 second serialization method described above must hence be used for this
117 with different values. The Journal supports this and will write such entries to
120 used for specific Journal fields however, where this is expected. Do not use
121 this for Journal fields where this is not expected and where code reasonably
156 this case should be pretty obvious: try connecting a socket to
168 environment variable. The systemd service logic sets this variable to a
176 Why bother with this environment variable check? A service program invoked by
186 If you are looking for alternative implementations of this protocol (besides