writer_is_journald

Check whether the given output_fd file descriptor is a connection to the systemd journal, or something else (like a log file or `stdout` or `stderr`).

Invalid file descriptors are accepted and return false, which allows for the following construct without needing any additional error handling:

  is_journald = g_log_writer_is_journald (fileno (stderr));

Parameters:

output_fd

output file descriptor to check

Returns:

true if output_fd points to the journal, false otherwise