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This can’t be emphasized enough.   A couple of years ago I was wrestling with a really old application which “inexplicably” did not run on one of several different machines.   It turned out to be a problem such as this:   there was a common subroutine-name, more than one potential source of it, and a very slight difference in the file setup on that one machine ... a file was there but not being picked up, long story.   But the bottom line was that the intended (correct ...) behavior of that code as-written was in effect contextually determined, with an ambiguity in play that was hiding the root problem.   Learning from this, I now try to be as explicit as possible in every place where such ambiguities might occur: using qw() import-lists with large “kitchen sink” utility packages, and sometimes empty lists there with explicit fully-qualified (i.e. with package name expressly specified) references to the exact routine that I need.   These problems, when I have seen them, come from software that was originally written for older Perls.


In reply to Re^2: Which module contains an imported subroutine by sundialsvc4
in thread Which module contains an imported subroutine by john.deighan

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    [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 :)
    [tye]: that is what getlogin() certainly *used* to do. I don't believe that is what it certainly should do.
    [davido]: /var/run/utmp is 664 i think.
    [tye]: Note that my "man getlogin" says that it uses stdin when it should use /dev/tty (calling a glibc bug). But that does not appear to be the case when I test it. But maybe Perl's getlogin() is not using glibc's getlogin().
    [oiskuu]: well, run a strace and see what the getlogin does for you.... As I said. SELinux probably has those security labels. But not regular linux.
    [tye]: for example, read https://unix. stackexchange.com/ questions/146138/ loginuid-should-be -allowed-to-change -or-not-mutable-or -not
    [tye]: I'm not using SELinux and it certainly appears to disagree with you. shrug
    [tye]: Since you brought up /proc, oiskuu, I didn't see you respond to my suggestion of 'loginuid'. Does your /proc not have such?

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