Function systemd_journal_logger::connected_to_journal

pub fn connected_to_journal() -> bool

Whether this process is directly connected to the journal.

Inspects the $JOURNAL_STREAM environment variable and compares the device and inode numbers in this variable against the stdout and stderr file descriptors.

Return true if either stream matches the device and inode numbers in $JOURNAL_STREAM, and false otherwise (or in case of any IO error).

Systemd sets $JOURNAL_STREAM to the device and inode numbers of the standard output or standard error streams of the current process if either of these streams is connected to the systemd journal.

Systemd explicitly recommends that services check this variable to upgrade their logging to the native systemd journal protocol.

See section “Environment Variables Set or Propagated by the Service Manager” in systemd.exec(5) for more information.