- being part of a login session this function will fail with
- -ENXIO. The returned string needs to be freed with the libc
- <citerefentry
- project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- call after use.</para>
-
- <para><function>sd_pid_get_unit()</function> may be used to
- determine the systemd system unit (i.e. system service) identifier
- of a process identified by the specified PID. The unit name is a
- short string, suitable for usage in file system paths. Note that
- not all processes are part of a system unit/service (e.g. user
- processes, or kernel threads). For processes not being part of a
- systemd system unit this function will fail with -ENXIO (More
- specifically: this call will not work for processes that are part
- of user units, use <function>sd_pid_get_user_unit()</function> for
- that.) The returned string needs to be freed with the libc
+ being part of a login session, this function will fail with
+ -ENODATA. The returned string needs to be freed with the libc