Arch Linux

rsyslog 8.27.0-1
linux 4.11.3-1
logrotate 3.12.2-1

HUP fails.

$ cat /etc/logrotate.d/rsyslog
/var/log/auth.log /var/log/cron.log /var/log/daemon.log /var/log/debug /var/log/kern.log /var/log/lpr.log /var/log/mail.err /var/log/mail.info /var/log/mail.log /var/log/mail.warn /var/log/messages /var/log/news /var/log/syslog /var/log/user.log {
missingok
sharedscripts
postrotate
/usr/bin/killall -HUP /usr/bin/rsyslogd
endscript
}

$ ps wax|grep sysl
361 ? Ssl 1:05 /usr/bin/rsyslogd -n -i /run/rsyslogd.pid

$ sudo /usr/bin/killall -HUP /usr/bin/rsyslogd ; echo $?
/usr/bin/rsyslogd: no process found
1

$ sudo /usr/bin/killall -HUP rsyslogd ; echo $?
0

Why is that?

Does the HUP command in /etc/logrotate.d/rsyslog need to be changed?