unix - Change user id of all running process without stopping them -


i have presently process running user1 id on server . have new user user2 , want process running user1 run user2. done consistency other host uses user2 should things should follow , must things ? note user1 , user2 both have root privileges. number of processes running currenyly user1 half of process running on server.

i don't believe possible. process can call setuid() itself, trying change user identity on running process have disastrous effects: process requiring privileges loses them causing exceptions, or process shouldn't have privileges (and poorly written) damage system upon gaining them. historical log data process may no longer make sense, , if process has kind of cache @ related user name (say file in home directory) or privileges cache become invalidated without process having way of knowing that.

the 'real' way restart processes new user.


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