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<a href=/index.xml target=_blank class=hob>RSS</a></nav></header><main role=main><article itemtype=http://schema.org/Article><h1 itemtype=headline>Drawing Pixels in Plan9</h1><p><cap>note</cap>, May 27, 2023 on <a href=https://mitjafelicijan.com>Mitja Felicijan's blog</a><div><p>I have started exploring Plan9's graphics capabilities. This is a hello world
alternative for drawing that draws a yellow square on a blue background.<p>More information:<ul><li><a href=https://github.com/0intro/plan9/blob/main/sys/include/draw.h>draw.h header file</a>
contains all the drawing functions<li><a href=https://9fans.github.io/plan9port/man/man3/draw.html>draw man page</a>
has a bit more digestable descriptions of the draw functions<li><a href=https://9fans.github.io/plan9port/man/man3/graphics.html>graphics man page</a>
has a bit more digestable descriptions of the graphics functions<li><a href=https://9fans.github.io/plan9port/man/man3/>all man pages</a>
can be a valuable resource for learning about the system</ul><figure><img src=/notes/plan9-pixels.png alt="Plan9 Howdy World!"></figure><pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:green>// main.c
</span></span></span><span style=display:flex><span><span style=color:green></span><span style=color:#00f>#include</span> <span style=color:#00f><u.h></span><span style=color:#00f>
</span></span></span><span style=display:flex><span><span style=color:#00f>#include</span> <span style=color:#00f><libc.h></span><span style=color:#00f>
</span></span></span><span style=display:flex><span><span style=color:#00f>#include</span> <span style=color:#00f><draw.h></span><span style=color:#00f>
</span></span></span><span style=display:flex><span><span style=color:#00f>#include</span> <span style=color:#00f><cursor.h></span><span style=color:#00f>
</span></span></span><span style=display:flex><span><span style=color:#00f></span>
</span></span><span style=display:flex><span><span style=color:#2b91af>void</span>
</span></span><span style=display:flex><span>main()
</span></span><span style=display:flex><span>{
</span></span><span style=display:flex><span> ulong co;
</span></span><span style=display:flex><span> Image *im, *bg;
</span></span><span style=display:flex><span> co = 0x0000FFFF;
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> <span style=color:#00f>if</span> (initdraw(nil, nil, argv0) < 0)
</span></span><span style=display:flex><span> {
</span></span><span style=display:flex><span> sysfatal(<span style=color:#a31515>"%s: %r"</span>, argv0);
</span></span><span style=display:flex><span> }
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> im = allocimage(display, Rect(0, 0, 300, 300), RGB24, 0, DYellow);
</span></span><span style=display:flex><span> bg = allocimage(display, Rect(0, 0, 1, 1), RGB24, 1, co);
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> <span style=color:#00f>if</span> (im == nil || bg == nil)
</span></span><span style=display:flex><span> {
</span></span><span style=display:flex><span> sysfatal(<span style=color:#a31515>"not enough memory"</span>);
</span></span><span style=display:flex><span> }
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> draw(screen, screen->r, bg, nil, ZP);
</span></span><span style=display:flex><span> draw(screen, screen->r, im, nil, Pt(-40, -40));
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> flushimage(display, Refnone);
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> <span style=color:green>// Wait 10 seconds before exiting.
</span></span></span><span style=display:flex><span><span style=color:green></span> sleep(10000);
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> exits(nil);
</span></span><span style=display:flex><span>}
</span></span></code></pre><p>And then compile with <code>mk</code> (mkfile below):<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:green># mkfile
</span></span></span><span style=display:flex><span><span style=color:green></span><span></$objtype/mkfile</span>
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span>RC=/rc/bin
</span></span><span style=display:flex><span>BIN=/$objtype/bin
</span></span><span style=display:flex><span>MAN=/sys/man
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span>main:
</span></span><span style=display:flex><span> $CC $CFLAGS main.c
</span></span><span style=display:flex><span> $LD $LDFLAGS -o main main.$O
</span></span></code></pre><p>And run with <code>./main</code>. To exit the program, press <code>Delete key</code> (strange but this
is the alternative for Ctrl+C).<p><em>This is <strong>very cool</strong> indeed!</em></div></article></main><section><hr><h2>Posts from blogs I follow around the net</h2><ul><li><a href=https://utcc.utoronto.ca/~cks/space/blog/linux/NFSv4ServerLockClients target=_blank rel=noopener>Finding which NFSv4 client owns a lock on a Linux NFS(v4) server</a> — <a href=https://utcc.utoronto.ca/~cks/space/blog/>Chris's Wiki :: blog</a><div>A while back I wrote an entry about finding which NFS client owns
a lock on a Linux NFS server, which turned
out to be specific to NFS v3 (which I really should have seen coming,
since it involved NLM and lockd). Finding the NFS v4 client that
owns a lock is, depending on your perspective, either simpl…<li><a href=http://www.landley.net/notes-2023.html#28-10-2023 target=_blank rel=noopener>October 28, 2023</a> — <a href=http://www.landley.net/notes-2023.html>Rob Landley's Blog Thing for 2023</a><div>Oh good grief, two of my least favorite licensing people, Larry Rosen
and Bradley Kuhn, are interacting on the OSI's license-discuss
list where the're doing
bad computer history and insisting that a guy Larry Rosen
coincidentally interviewed for a book years ago is clearly the origin of
somethin…<li><a href="http://offbeatpursuit.com:80/blog/?id=25" target=_blank rel=noopener>A fix by any other name</a> — <a href=http://offbeatpursuit.com:80/blog/>WLOG - blog</a><div>tags:
i2c, plan9
Another month, another file system.
Well, if you can’t fix it in software, fix it in hardware (looking at
you, bme680, we’re not
done yet). The show must go on, as they say, and I would like my
experiments to go on.
So a “new” addition to the environmental sensor family connected to
the h…<li><a href=https://mirzapandzo.com/next-image-url-parameter-is-valid-but-upstream-response-is-invalid target=_blank rel=noopener>Next/Image "url" parameter is valid but upstream response is invalid</a> — <a href=https://mirzapandzo.com/>Mirza Pandzo's Blog</a><div>Getting "url" parameter is valid but upstream response is invalid error with Next/Image on WSL2<li><a href=https://drewdevault.com/2023/10/13/Going-off-script.html target=_blank rel=noopener>Going off-script</a> — <a href=https://drewdevault.com>Drew DeVault's blog</a><div>There is a phenomenon in society which I find quite bizarre. Upon our entry to
this mortal coil, we are endowed with self-awareness, agency, and free will.
Each of the 8 billion members of this human race represents a unique person, a
unique worldview, and a unique agency. Yet, many of us have the sam…<li><a href=https://szymonkaliski.com/writing/2023-10-02-building-a-diy-pen-plotter/ target=_blank rel=noopener>Building a DIY Pen Plotter</a> — <a href=http://github.com/dylang/node-rss>Szymon Kaliski</a><div>This article documents my learnings from designing and building a DIY Pen Plotter during the summer of 2023.
My ultimate goal is to build my…<li><a href=https://neil.computer/notes/chart-of-accounts-for-startups-and-saas-companies/ target=_blank rel=noopener>Chart of Accounts for Startups and SaaS Companies</a> — <a href=https://neil.computer/>Neil Panchal</a><div>Accounting is fundamental to starting a business. You need to have a basic understanding of accounting principles and essential bookkeeping. I had to learn it. There was no choice. For filing taxes, your CPA is going to ask you for an Income Statement (also known as P/L statement). If<li><a href=https://journal.valeriansaliou.name/deploy-a-nomad-cluster-on-alpine-linux-with-vultr/ target=_blank rel=noopener>Deploy a Nomad Cluster on Alpine Linux with Vultr</a> — <a href=https://journal.valeriansaliou.name/>Valerian Saliou</a><div>After spending countless hours trying to understand how to deploy my apps on Kubernetes for the first time to host Mirage, an AI API service that I run, I ended up making myself a promise that the next app I work on would be using a more productive & simpler<li><a href=https://jcs.org/2023/10/25/wifi_da target=_blank rel=noopener>BlueSCSI Wi-Fi Desk Accessory 1.0 Released</a> — <a href=https://jcs.org/>joshua stein</a><div>BlueSCSI Wi-Fi Desk Accessory
1.0 has been released:
wifi_da-1.0.sit
(StuffIt 3 archive)
SHA256: ccfc9d27dd5da7412d10cef73b81119a1fec3848e4d1d88ff652a07ffdc6a69aSHA1: ff124972f202ceda6d7fa4788110a67ccda6a13a
This is the initial public release of my BlueSCSI Wi-Fi Desk Accessory for
classic MacOS.<li><a href=https://michael.stapelberg.ch/posts/2023-10-25-my-all-flash-zfs-network-storage-build/ target=_blank rel=noopener>My 2023 all-flash ZFS NAS (Network Storage) build</a> — <a href=https://michael.stapelberg.ch/>Michael Stapelbergs Website</a><div>For over 10 years now, I run two self-built NAS (Network Storage) devices which serve media (currently via Jellyfin) and run daily backups of all my PCs and servers.
In this article, I describe my goals, which hardware I picked for my new build (and why) and how I set it up.
Design Goals
I use my netw…</ul><p>Generated with <a href=https://git.sr.ht/~sircmpwn/openring target=_blank rel=noopener>openring</a>.</section><footer><hr><p><big><strong>Want to comment or have something to add?</strong></big><p>You can write me an email
at <a href=mailto:mitja.felicijan@gmail.com>mitja.felicijan@gmail.com</a> or
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