.B CLONE_NEWPID
flag.
Unshare the PID namespace,
-so that the calling process is moved into a new PID namespace
+so that the calling process has a new PID namespace for its children
which is not shared with any previously existing process.
Use of
.BR CLONE_NEWPID
Unshare the user namespace,
so that the calling process is moved into a new user namespace
which is not shared with any previously existing process.
+.BR CLONE_NEWUSER
+requires the calling process is not threaded and the user ID and group ID
+of the calling process are mapped user IDs and group IDs in the
+user namespace of the calling process at the time of the call.
+
.TP
.BR CLONE_NEWUTS " (since Linux 2.6.19)"
This flag has the same effect as the