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|<trademark class="registered">Linux</trademark> emulation in FreeBSD|
|<personname> <firstname>Roman</firstname> <surname>Divacky</surname> </personname> <affiliation> <_:address-1/> </affiliation>|
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|Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this document, and the FreeBSD Project was aware of the trademark claim, the designations have been followed by the <quote>™</quote> or the <quote>®</quote> symbol.|
|This masters thesis deals with updating the <trademark class="registered">Linux</trademark> emulation layer (the so called <firstterm>Linuxulator</firstterm>). The task was to update the layer to match the functionality of <trademark class="registered">Linux</trademark> 2.6. As a reference implementation, the <trademark class="registered">Linux</trademark> 2.6.16 kernel was chosen. The concept is loosely based on the NetBSD implementation. Most of the work was done in the summer of 2006 as a part of the Google Summer of Code students program. The focus was on bringing the <firstterm>NPTL</firstterm> (new <trademark class="registered">POSIX</trademark> thread library) support into the emulation layer, including <firstterm>TLS</firstterm> (thread local storage), <firstterm>futexes</firstterm> (fast user space mutexes), <firstterm>PID mangling</firstterm>, and some other minor things. Many small problems were identified and fixed in the process. My work was integrated into the main FreeBSD source repository and will be shipped in the upcoming 7.0R release. We, the emulation development team, are working on making the <trademark class="registered">Linux</trademark> 2.6 emulation the default emulation layer in FreeBSD.|
|In the last few years the open source <trademark class="registered">UNIX</trademark> based operating systems started to be widely deployed on server and client machines. Among these operating systems I would like to point out two: FreeBSD, for its BSD heritage, time proven code base and many interesting features and <trademark class="registered">Linux</trademark> for its wide user base, enthusiastic open developer community and support from large companies. FreeBSD tends to be used on server class machines serving heavy duty networking tasks with less usage on desktop class machines for ordinary users. While <trademark class="registered">Linux</trademark> has the same usage on servers, but it is used much more by home based users. This leads to a situation where there are many binary only programs available for <trademark class="registered">Linux</trademark> that lack support for FreeBSD.|
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