Hi, There was an update of glibc on CentOS 6
http://lists.CentOS.org/pipermail/CentOS-announce/2015-January/020863.html and now:
1 : /sbin/init
How do i tell /sbin/init to use the updated files from glibc without a reboot?
You can’t. See the manpage for /telinit/ and the warning for the “-U”
The question was specifically about CentOS 6, which uses upstart. SysV init could re-exec itself cleanly. I have no idea, but plenty of doubts, about systemd.
“systemctl daemon-reexec” will re-exec systemd. It does mostly the same thing when it gets SIGTERM, according to the man page.