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Re^2: How Greedy is Greedy: A Regex Question

by dsb (Chaplain)
on Apr 25, 2007 at 14:00 UTC ( #612020=note: print w/replies, xml ) Need Help??

in reply to Re: How Greedy is Greedy: A Regex Question
in thread How Greedy is Greedy: A Regex Question

Actually, i wasn't complaining at all. Rather inquiring as to what it is about the ? that makes the expression non-greedy back when I was still first tackling regexes. That said, I fail to see what .? would accomplish. It would match 0 or 1 non-newline characters, which has nothing to do with the OP. Perhaps you can expand on you thinking?

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[tye]: I just daemonized and getlogin() still knew who I had been.
[tye]: perhaps loginuid ? Not that I concede that something not being in /proc means it is not useful.
[Corion]: tye: That's really interesting, but maybe it is because getlogin() returns the name, or the uid, so if that user has been replaced by another user with the same uid in the meantime, that's no problem to the system...
[davido]: or on ubuntu /var/run/utmp
[Corion]: Otherwise, I would imagine that a user with a process still alive would lock that information in memory.
[davido]: so last -f /var/run/utmp on ubuntu provides similar (though more verbose) info
[oiskuu]: glibc getlogin just does ttyname() and falls back on getutline(); it's not security related at all. (reminds me of sendmail and remote finger services of the naive early spam era)
[Corion]: But yes, "who started this process" is interesting information :)
[tye]: no, I really believe that "login user" was added as a fundamental bit of info about each process in order to enhance the usefulness of auditing
[Corion]: Ah - if that information is saved in a file, then you could theoretically spam that file and confuse getlogin(). So, don't use it for authentication :)

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