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<title>White paper: Libgtop Reference Manual</title>
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White paper
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Introduction
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Overview
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Interface Design: Things that need to be considered
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Server Implementation: The LibGTop "server"
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Introduction
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Many modern UNIX systems like Solaris, BSD or Digitial Unix
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only allow priviledged processes to read information like CPU and
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Memory Usage or information about running processes.
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BSD, for instance, doesn't have any other way to get those data than reading
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directly from @file{/dev/kmem} and you need to be in the @code{kmem} group to
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be able to read this.
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Other systems, like Digital Unix, allow all users to get things like CPU and
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Memory statistics, but only root may read information about any process other
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than the current one (you may not even get information about your own processes
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if you're not root).
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Linux has a very nice @file{/proc} filesystem, but reading and parsing
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@file{/proc} is very slow and inefficient.
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Solaris is a bit better, but you still need to be in the @code{sys} group or
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even root to get some data.
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Because of this system utilities like @code{ps}, @code{uptime} or @code{top}
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often are setgid kmem or setuid root. Usually, they're also very specific to
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the system they're written for and not easily portable to other systems without
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a lot of work.
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This, of cause, becomes a problem for graphical tools like @code{gtop} - making
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a GTK+ program setgid or even setuid would be a security hole as big as you can
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drive the entire X11 source code through. For the GNOME project, we also needed
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some kind of library which provides all the required information in a portable
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since there's more than just one single program that wants to use them - for
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instance @code{gtop} and the @code{multiload}, @code{cpumemusage} and
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@code{netload} panel applets.
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