Berkeley CSUA MOTD:Entry 16098
Berkeley CSUA MOTD
 
WIKI | FAQ | Tech FAQ
http://csua.com/feed/
2025/07/08 [General] UID:1000 Activity:popular
7/8     

1999/7/9-12 [Computer/SW/OS/Solaris, Computer/SW/OS/Linux] UID:16098 Activity:high
7/9     Does anyone know what set of libraries programs like linux and apache
        uses to dynamically load modules during run time?
        \_ The answer you want is libdl.
        \_ Linux is an OS not a program.  The answer you want is libdl.
           \_ so are you saying that an OS isn't a program?  So what is YOUR
              definition of a program--everything that runs on a computer
              except for the OS?!?  sheesh, and you are a CS major (or already
              have your degree).
                \_ 'program' generally means 'application' these days.  Only
                   a twittish cs major or prof might tell you otherwise.  I
                   didn't fill out a PO for 200 cd's of the linux program
                   last week.  I filled out a PO for 200 cd's of the linux OS.
                   Give a hoot, don't be a twit.
           \_ what header files do you include?
                \_ Either read the docs or look at the source you lazy ass.
                   Perl, apache, and mozilla all have readily available
                   source you can read/copy from.
                   \_ If you know the answer you can save us all the trouble
                      and stupid flames and post the answer in which case
                      everyone who comes across it (whether they are
                      interested or not or just newbies) will benefit
                      or you can be a total asshole and take up pointless
                      space on the motd.
                        \_ There's another type of space in the motd?
                        \_ but taunting people is what CSUA is all about.
                           Computer Science's Unhelpful Assholes
                           \_ hi, dude.
                        \_ If you tell us what OS, then we can answer.  The
                           answer is different for different OS'es.  For all
                           we know, then answer he wants is "DLLs you poor
                           winblows scum".
                   \_ you're right, i am lazy. but some of us are still using
                      cheap ass 14k modems that don't work for shit, moron.
                        \_ The interfaces differ by platform.  Read the stupid
                           docs for your platform.
                        \_ A 14.4 modem works fine to ftp a copy to soda and
                           untar and look at the code from here.
                \_ If you have libdl, then run nm on it and see what
                   functions are included and read the docs for them or
                   grep for them in /usr/include.
        \_ dlopen() is the most common interface - run man dlopen and see if
                it's available on your platform.
                \_ I wonder how much overhead calling these functions incur
                   as opposed to statically linking the files and calling
                   them straight.
                        \_ Not that much on modern CPU's.  Much much lower
                           overhead than relinking everytime you want to
                           install a new module/plugin, use a new library
                           version, or want to use specially-optimized
                           code (like MMX plugins for photoshop or on
                           Solaris where Ultra's load specially tuned
                           versions of libc if you dynamically link).
        \_ The answer you want if you're writing software for distribution or
           to run on multiple platforms is GNU libtool, which handles all the
           different interfaces for you and provides a single standardized
           interface you can call.
                \_ I just wish libtool had fewer warts... it annoys me
                   when it looks like it's decided some library ought to be
                   "libfoo-x.y.z.so.0.0.0" instead of "libfoo.so.x.y.z"...
                   but then maybe that's just maintainer incompetence, as I've
                   never actually designed a package that used it. -brg
        \_ Um, you could run ldd on Apache's httpd and see what libraries it
           is linked against.
2025/07/08 [General] UID:1000 Activity:popular
7/8     

You may also be interested in these entries...
2010/2/8-18 [Computer/SW/Apps/Media, Computer/SW/Apps] UID:53695 Activity:kinda low
2/5     I like Adobe Flash. When written correctly, it scales along
        with your browser size. It looks consistent on every single
        browser. It is predictable. On the other hand, I'm not a big
        fan of CSS/HTML, which for the most part, look wildly different
        between browsers, and don't even work consistently or
        correctly at times. So why do so many people (like Steve Jobs)
	...
2009/10/27-11/3 [Computer/SW/Unix] UID:53475 Activity:nil
10/27   http://www.maxgames.com/play/flash-mind-reader.html
        how does this work?
        \_ sh -c 'for ((i=0;i<10;i++)); do for ((j=0;j<10;j++)); do echo "$i$j-(\
$i+$j)" | bc; done ; done' | uniq
        \_ bash -c 'for ((i=0;i<10;i++)); do for ((j=0;j<10;j++)); do echo "$i$j\
-($i+$j)" | bc; done ; done' | uniq
	...
2009/4/20-23 [Computer/SW/Database] UID:52876 Activity:nil
4/19    ORCL u SUNW = ORCL.
        What is Larry Ellison thinking? What is he going to do with a bunch of
        legacy Sun hardware that no one uses anymore, its fading workstation
        customer base, and open source Sun MySQL that doesn't even generate
        revenue? I really don't get all this acquisition business.
        \_ A lot of big companies still use big, fat Sun hardware. Or use
	...
2009/1/15-23 [Computer/SW/OS/OsX] UID:52398 Activity:nil
1/15    can any serious development be done on OSX that is not *for OSX*.
        i'll grant that ruby on rails has excellent tutorials for the mac.
        discuss:
        \_ What kind of serious development?  If you want to use the standard
           OSX ui then your ui code will be pretty much useless elsewhere,
           but that's why concepts like MVC are so important.  Otherwise
	...
2008/11/29-12/6 [Computer/SW/OS/FreeBSD, Computer/SW/OS/VM] UID:52129 Activity:moderate
11/29   I'm experimenting with virtualization, and as a poor college student
        I'm wondering what the best alternatives for virtualization are, and
        how best to cut my teeth on messing with non-linux platforms (or I
        guess interesting stuff on Linux would work too). Right now I've got
        FreeBSD7 running on KVM on my home computer (on a Core 2 Quad), and am
        somewhat at a loss as to how to use it. (More details: bridged
	...
2008/11/14-26 [Computer/SW/Languages/Java, Computer/SW/OS/Solaris] UID:51970 Activity:moderate
11/13   http://sfgate.com/cgi-bin/article.cgi?f=/n/a/2008/11/14/financial/f051352S72.DTL
        http://preview.tinyurl.com/6nngpm
        Sun Microsystems Inc. plans to cut up to 6,000 jobs, or 18 percent of
        its global work force, as sales of its high-end computer servers have
        collapsed.  The drastic move announced Friday highlights Sun's
        desperation to cut costs and survive as an independent company. Sun's
	...
2008/11/14-26 [Computer/SW/OS/Linux, Computer/SW/OS/Solaris] UID:51989 Activity:moderate
11/14   lulz why doesn't GOOG buy JAVA i mean SUN i mean whatever the hell they
        are these days.
        \_ Even GOOG isn't THAT stupid
           \_ Sorry, but WHY would Google do something like that? They
              run 99.2% Linux servers on the backend. They don't use
              Solaris for development. I mean, what does Sun have to
	...
2008/9/24-29 [Computer/SW/OS/Windows, Computer/SW/OS/Solaris] UID:51283 Activity:nil
9/24    Why is nscd going crazy?  DoS?
        \- back in the solaris say 2.5-2.6 era, it had both some bugs
           (some malformed nis maps made it go crazy) and architectural
           flaws in the IPC/door+threading mechanism. if you are running
           OS-recent, dunno, but you can trace it.
           \_ Yeah, I think it's just buggy.  I've restarted it, and it seems
	...
2008/4/3-9 [Computer/SW/Languages/Misc, Computer/SW/OS/Solaris] UID:49658 Activity:nil
4/3     Solaris experts: I've never played with ZFS. Does it have a native
        dump command a la ufsdump?
        \_ This might be what you are looking for:
           http://preview.tinyurl.com/2xqkda [sun - bigadmin]
	...
2008/3/30-4/6 [Computer/SW/OS/Solaris] UID:49614 Activity:nil
3/30    Question: I just deleted 60 GB of files from an 80 GB disk. The
        disk activity lights were blinking like crazy and I could hear the
        drive crunch while the data was deleted. This is under Solaris.
        Anyway, I think UNIX uses unlink() when files are deleted. Shouldn't
        it just update the free list on the superblock and call it a day?
        What is all the crunching about?
	...
2007/11/27-30 [Computer/SW/Languages/C_Cplusplus, Computer/SW/OS/Solaris] UID:48701 Activity:high
11/27   I'm using select to do a nonblocking check to see if a single socket
        has anything to read off it.  Problem is, I can have up to 12228
        file descriptors, and Linux fd_set only supports up to 4096.  Any idea
        what I can do about this?  (Or a better solution?) -jrleek
        \- 1. who are you
           2. i am busy this week and you didnt mention language
	...
2013/2/19-3/26 [Computer/SW/OS/OsX] UID:54611 Activity:nil
2/19    I program a lot by sshing to a Linux cluster.  So I'm used to using
        Xemacs to code.  This works fine from a Linux or Windows workstation,
        but sometimes I have to use a Mac.  On Mac, the meta is usually
        bound to option, but that often doesn't work over ssh for some reason.
        This makes using emacs a real pain.  Any suggestions on how to fix it?
        (Other than "use vi")
	...
2012/8/28-11/7 [Computer/HW/Memory] UID:54466 Activity:nil
8/26    Amazon medium instances (3.75GB RAM): 0.160/hour = $1382/year
        Generic standard Linux VPS (4GB RAM): $480/year
        Amazon costs more (but does offer superior scaling options).
        \_ Amazon is $670 if you buy a year's usage up front (heavy util).
           Why is heavy util less expensive than light util?
	...
2012/1/4-2/6 [Computer/HW/Drives] UID:54281 Activity:nil
1/4     I want to test how my servers behave during a disk failure and
        a RAID reconstruction so I want to simulate a hardware failure.
        How can I do this in Linux without having to physically pull
        a drive? These disks are behind a RAID card and run Linux. -ausman
        \_ According to the Linux RAID wiki, you might be able to use mdadm
           to do this with something like the following:
	...
2010/7/21-8/9 [Computer/SW/OS/FreeBSD] UID:53890 Activity:nil
7/21    Can I just use ifconfig to expand my netmask on a FreeBSD box?
        Are there any gotchas here? Linux forces me to restart my network
        to expand my netmask.
        \_ yes... and no, you don't have to restart your network on linux either
           \_ Rebooting is the Ubootntoo way!
              \_ Oooboot'n'tootin!
	...
2010/7/22-8/9 [Computer/SW/OS/FreeBSD, Computer/HW/Drives] UID:53893 Activity:nil
7/22    Playing with dd if=/dev/random of=/dev/<disk> on linux and bsd:
        2 questions, on linux when <disk>==hda it always gives me this off
        by one report i.e. Records out == records in-1 and says there is an
        error. Has anyone else seen this?  Second, when trying to repeat this
        on bsd, <disk>==rwd0 now, to my surprise, using the install disk and
        selecting (S)hell, when I try to dd a 40 gig disk it says "409 records
	...
2010/5/26-6/30 [Computer/SW/Unix/WindowManager, Computer/SW/OS/OsX] UID:53844 Activity:nil
5/26    anyone use lxde?  supposedly it is less stupid than xfce and
        less bloated than gnome.  thoughts?
        \_ lol, does anyone still use desktop linux?  Get with the times
           buy a mac.  Now.  DO IT.  Go NOW.
           \_ but we prefer herring to Kool-Aid
              \_ "you have to yell, he's hard of herring"
	...
2010/5/6-26 [Computer/SW/OS/Windows] UID:53818 Activity:low
5/5     Does anyone know how to do custom install of Ubuntu 10.04? I can't
        even boot it up to give me the menu to custom install and it
        keeps installing a bunch of crap I don't need. It's getting
        just as slow and bloated as Winblows install. Dear lord,
        I miss the old Ubuntu.
5/5=1.0 Numerology FTW.    5+5=10
	...
2010/4/22-5/10 [Computer/SW/Languages/Misc] UID:53797 Activity:nil
4/22    In Linux is there an easy way to rename the scripts in /etc/rc?.d ?
        For example I want to set all the /etc/rc?.d/S91apache to S100apache
        so that it'll run the ramdisk BEFORE going to apache.
        \_ Sure, just move them.
           \_ I mean is there a script that will rename all of them
              for me? Like: setrc apache2 0 0 1 1 1 1
	...