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One thing that happens periodically is that I start a process from an interactive shell, discover that it takes longer than expected, and then want to know how long it took. Basically it’s a retrospective need to have run “time whatever” that I discover after the process has been running for long enough that I don’t want to restart it. My current procedure in such situations is to run ps from another session to discover when it started and then type date to display when it ends.
A quick test with strace showed that bash uses the wait4() system call to determine when a process ends, but passes NULL as the last parameter. If it passed the pointer to a struct rusage then it would have the necessary data.
I think it would be a really good feature for a shell to allow you to type something like “echo $TIME_LAST_CMD” to see how long the last command took. For the common case where you aren’t interested in that data it would only involve an extra parameter to the wait4() system call, a small amount of memory allocated for it, and to store yet another environment variable in it’s list.
A quick Google search didn’t show any way of filing wishlist bugs against Bash and I don’t think that this is a real bug as such so I haven’t filed a bug report. If anyone reads my blog and has some contact with the Bash people then please pass this idea along if you think it’s worthy of being included.
On Wednesday I saw a group of people wearing nothing but underwear walking through the Melbourne CBD. They were promoting Pants To Poverty which is a UK based underwear company that sells Organic Fair-Trade underpants [1]. The corporate web site seems equally divided between the purposes of selling underpants and lobbying for a variety of social issues including fair-trade, better working conditions in factories, and the abolition of pesticides that kill farmers.
The web site itself is worth a look in terms of it’s design, for what it does it works really well. When viewing a picture of a model wearing underpants you can scroll your mouse over the picture to see an enlarged view of a particular area of interest. This works really well on a Netbook display (everyone should carry a Netbook with 3G net access when shopping), I would like to see car companies use the same technique for displaying pictures of cars on small screen devices. It’s unfortunate that it doesn’t just show the full sized images when you use a large display, it would all fit on a 1680*1050 display.
The underwear in the UK costs between 10 pounds ($16.40AU) and 15 pounds ($24.60AU) a pair for adults and 18 pounds ($29.52AU) a pair for a pack of three for children. The Little Green Bag Co [2] sells the adult underpants in Australia for $22AU per pair. These appear to be the cheaper items from the range, so it seems that it would be cheaper to order from the UK if you were buying a few pairs. Also if the items you wanted happened to be the more expensive items from the range then you would have to order from the UK.
A quick check of the Myer web site shows that even $22 per pair isn’t particularly expensive for women’s underwear, but it is really expensive for men’s underwear. The Australian web site for Pants to Poverty lists a bunch of resellers, but a quick scan of the list didn’t turn up anyone cheaper than the Little Green Bag Co.
According to the “sizing information” on the home page of the UK site the largest underpants that they sell are “size 14” (in the Australian size range for women which is apparently 78-83cm). According to a variety of news reports the average size of an Australian women is either size 14 or 14-16. Apparently women’s clothing is often not made to standard sizes due to the practice of vanity sizing, so it’s difficult to determine how these things compare. But it does seem that a significant portion of the women in Australia won’t be able to buy products from Pants To Poverty in their size.
I don’t think that many men will buy from them, $22 is really expensive.
So while I think it’s great to have a bunch of men and women running around the CBD wearing only underwear I don’t think that the future of their Australian business is particularly good.
The difference in price between Pants To Poverty products and other underwear would allow you to buy a significant quantity of Organic Fair Trade chocolate or other food.
The Problem
I was asked for advice on buying headphones to protect students who have medical conditions that make them sensitive to noise, such headphones would have to allow them to hear human voices.
Due to the significant differences in hearing issues (including physical damage and sensory issues) it seems unlikely that getting identical headphones for all students will give an ideal result. The person who asked me the question didn’t explain what type of students are being taught. If it’s an adult education class then getting everyone the ideal headset wouldn’t be particularly difficult. If however it’s the special needs class in a high school then students would probably want the most shiny headphones rather than the ones that are a best match to their hearing issues.
Also some combinations of hearing problems and ambient noise can’t be addressed by such headsets. A friend who developed Noise Induced Hearing Loss from shooting tells me that he really can’t stand brass instruments. But the high frequencies from such instruments tend not to be filtered well by noise canceling headphones, so any student who has such a problem would probably need hearing aids that filter out high frequencies – I believe that such hearing aids are available but don’t have any particular knowledge about them.
Test Results
I did a quick test on my Bose QC-15 noise canceling headphones [1] which cost me $320US including tax and my cheap Bauhn headphones from Aldi [2] which cost me $69AU (and which apparently could later be purchased on special for $35AU to clear stock).
I found that when not playing music they seemed to perform about equally well in terms of allowing me to hear people speaking, although I admit that just having a conversation with the nearest people wasn’t the most scientific test. When I was playing music I found that the Bose headset made it significantly more difficult to hear people speak than the Bauhn headset. This is an advantage for the Bose for it’s intended use, and I expect that students who need a headset for medical reasons won’t want to listen to music while studying so it’s never a disadvantage.
In both cases, if the headphones are used for just canceling unwanted noise the speaker shouldn’t need to raise their voice significantly to be heard. In some situations the noise canceling headphones make it easier for someone with good hearing to hear what people are saying, for example a conversation in a car or plane could probably be held at a lower volume if all people involved were wearing suitable noise canceling headphones. If however the students have damaged hearing then I can’t make any prediction as to whether the teacher could speak at a lower volume or whether they would be required to use a higher volume if the students wore such headphones.
The Brookstone on-ear headphones that I tested [3] seem particularly noteworthy in this regard due to the way they canceled the melody of the store background music and just left the singing. If someone wants to buy headphones for people with physical damage to their ears then the Brookstone product is really worth investigating. If however the target market happens to be people on the Autism Spectrum then they may hate anything that presses on their ears (as I do) in which case the Brookstone product can’t be considered. The Brookstone price of $150US (presumably $160 including tax) was also the best price I saw when shopping in the US – but I presume that I could have found something with a similar quality and price to Bauhn in the US if I looked hard enough.
Conclusion
The big advantage of the Bose for this use is that it blocks a wider range of frequencies than some other noise canceling headsets. They all work really well on regular low frequency noise such as car engine noise (whether a car passenger or a pedestrian) but to stop certain higher frequencies such as those from air conditioning systems the Bose wins hands down. I guess this may depend on what noise is to be blocked, if a class was held in the same room every time and noise canceling headsets were purchased specifically for that class then it would probably make sense to ensure that the acoustic capabilities of the headsets match the unwanted background noise and the hearing issue that each student has.
Here’s an Amazon link: Bose® QuietComfort® 15 Acoustic Noise Cancelling® Headphones
I’ve been reading about Sensory Processing Disorder. I’m sure that some children are doing poorly in the default school system because they either have an undiagnosed case of SPD or who don’t have enough symptoms to get a diagnosis. I think it would make a good experiment to try noise canceling headphones on some of the difficult children, I wouldn’t expect a high success rate – but if it worked in as little as 5% of cases and did no harm to the children who didn’t benefit then it would be worth doing.
The systemd projecct is an interesting concept for replacing init and related code [1]. There have been a few attempts to replace the old init system, upstart is getting some market share in Linux distributions and Solaris has made some interesting changes too.
But systemd is more radical and offers more benefits. While it’s nice to be able to start multiple daemons at the same time with dependencies and doing so offers improvements to the boot times on some systems that really doesn’t lead to optimal boot times or necessarily correct behavior.
Systemd is designed around a similar concept to the wait option in inetd where the service manager (formerly inetd and now the init that comes with systemd) binds to the TCP, UDP, and Unix sockets and then starts daemons when needed. It apparently can start the daemons as needed which means you don’t have a daemon running for months without serving a single request. It also implements some functionality similar to automount which means you can start a daemon before a filesystem that it might need has been fscked.
This means that a large part of the boot process could be performed in reverse. The current process is to run fsck on all filesystems, mount them, run back-end server processes such as database servers and then run servers that need back-end services (EG a web server using a database server). The systemd way would be for process 1 to listen on port 80 and it could then start the web server when a connection is established to port 80, start the database server when a connection is made to the Unix domain socket, and then mount the filesystem when the database server tries to access it’s files.
Now it wouldn’t be a good idea to start all services on demand. Fsck can take hours on some filesystems and is never quick at the best of times. Starting a major daemon such as a database server can also take some time. So a daemon that is known to be necessary for normal functionality and which takes some time to start could be started before a request comes in. As fsck is not only slow but usually has little scope for parallelisation (EG there’s no point running two instances of fsck when you only have one hard disk), so hints as to which filesystem to be checked first would need to be used.
Systemd will require more SE Linux integration than any current init system. There is ongoing debate about whether init should load the SE Linux policy, Debian has init loading the policy while Fedora and Ubuntu have the initramfs do it. Systemd will have to assign the correct SE Linux context to Unix domain socket files and listening sockets for all the daemons that support it (which means that the policy will have to be changed to allow all domains to talk to init). It will also have to manage dbus communication in an appropriate way which includes SE Linux access controls on messages. These features mean that the amount of SE Linux specific code in systemd will dwarf that in sysvinit or Upstart – which among other things means that it really wouldn’t make sense to have an initramfs load the policy.
They have a qemu image prepared to demonstrate what systemd can do. I was disappointed that they prepared the image with SE Linux disabled. All I had to do to get it working correctly was to run the command “chcon -t init_exec_t /usr/local/sbin/systemd” and then configure GRUB to not use “selinux=0” on the kernel command line.
Another idea is to have systemd start up background processes for GUI systems such as KDE and GNOME. Faster startup for KDE and GNOME is a good thing, but I really hope that no-one wants to have process 1 manage this! Having one copy of systemd run as root with PID 1 to start daemons and another copy of the same executable run as non-root with a PID other than 1 to start user background processes is the current design which makes a lot of sense. But I expect that some misguided person will try to save some memory by combining two significantly different uses for process management.
Steve Jobs has published an interesting article about Flash [1]. He criticises Flash for being proprietary, this seems a little hypocritical coming from Apple (who’s the only competitor for Microsoft in terms of being the most proprietary computer company) but is in fact correct. Steve advocates HTML5 which is a better technical solution to a lot of the things that Flash does. He claims that Apple users aren’t missing out on much, but I think that sites such as Physics Games [2] demonstrate the benefits of Flash.
I think that Apple’s attack on Flash is generally a good thing. HTML5 web sites will work everywhere which will be a good incentive for web designers to fix their sites. I also think that we want to deprecate it, but as it’s unfortunately popular it’s useful to have tools such as GNASH to use Flash based web sites with free software. Microsoft has belatedly tried to compete with flash, but it’s Silverlight system and the free but patent encumbered Linux equivalent Moonlight have very little content to play and will probably disappear soon. As an aside the relentless determination of GNOME people to force the MONO project (including Moonlight) on it’s users convinced me to remove GNOME from all systems that I run.
OS News has a good analysis of the MPEG-LA patents [3] which are designed to prevent anyone making any commercial use of H.264 – which includes putting such videos on sites that contain Google advertising! These patent terms are so horrible that they want to control video streams that were ever encoded with them, so you can’t even transcode a H.264 stream to an open format without potentially having the scum at MPEG-LA going after you. This is worth noting when examining Apple’s actions, they support MPEG patents and therefore seem happy to do anything that reduces the freedom of their customers. Apple’s 1984 commercial has been proven to be a lie, it’s Apple that wants to control our freedom.
Charles Stross makes some good points about the issues related to Apple and Flash [4]. He believes that it’s all part of an Apple push to cloud computing and that Apple wants to own all our data at the back-end while providing a relatively reliable front-end (IE without all the anti-virus nonsense that is needed on the MS-Windows platform. Cloud computing is a good thing and I can’t wait for the Linux support for it to improve, I support a number of relatives who run Linux and it would be a lot easier for me if they could have the primary storage for everything be on the cloud so that I can do central backups of user data and they can use their own data while visiting each other. I think that a network filesystem that is similar in concept to offline-IMAP would be a really good thing, I know that there are some filesystems such as AFS and CODA that are designed for wide area network use with client-side caching but as far as I am aware they aren’t designed for the type of operation that offline/caching IMAP supports.
Matt Brubeck has given a good status report of the work porting Firefox to Android [5]. He notes that the next version of Fennec (mobile Firefox) will have Electrolysis – the Firefox one process per tab feature that was first implemented in Google Chrome [6]. I think that the development of Fennec and the one process per tab feature are both great developments. Matt also says “One of my personal goals is to make Firefox compatible with more mobile sites, and to give web developers the tools and information they need to make their sites work great in mobile Firefox. I’ll write much more about this in future articles“, that sounds great, I look forward to the results of his coding and to reading his blog posts about it!
I wanted to get a Lexmark Prestige Pro805 printer to work under Linux, due to bad drivers from Lexmark and no driver support in Debian/Unstable I’ve given up and advised the people who purchased it to return it for a refund. I recommend that Lexmark not be considered when purchasing a printer for use with Linux.
The box advertises the URL http://www.lexmark.com.au/prestige for downloading Linux drivers. The driver file is named lexmark-inkjet-09-driver-1.5-1.i386_ts.deb.sh.tar.gz which makes anyone expect a tar.gz archive of a shell archive of a Debian package. But that’s not what it is at all, in Lexmark-land deb is not the file name extension for a Debian package, but just a random bit of text to identify a file that is somewhat related to Debian, the fact that the “Linux driver for Ubuntu/Debian Package Manager based distros” doesn’t use the string ubu in it’s name is something that would lead a typical Linux user to believe that deb means a Debian package. Similarly the file named lexmark-inkjet-09-driver-1.5-1.i386_ts.rpm.sh.tar.gz and described as “Linux driver for RedHat Package Manager based distros” is not actually an RPM package or inherently for RPM based distros, it’s just a shar archive that is built and tested for some unspecified version of some Red Hat distribution (RHEL? Fedora? SUSE?).
Now when I execute lexmark-inkjet-09-driver-1.5-1.i386_ts.deb.sh on an AMD64 version of Linux it opens an X11 window, prompts for the root password, and then fails because an i386 Debian package that it somehow built couldn’t be installed. When I ran the shar archive with the options “--noexec --keep” and examined the files it contained it has a few AMD64 executables – so obviously the software they used to create the installer has some support for AMD64 but they just decided not to use it. It seems that the only way to buy an i386 system nowadays is to buy an embedded system or a NetBook, all Desktops, laptops, and servers run the AMD64 architecture, as most people do a Linux install that matches the full capabilities of their system (IE running AMD64 software on an AMD64 CPU) that means most systems sold in the last few years can’t be used with a new Lexmark printer without an unreasonable amount of work. Sure it is possible to setup a chroot environment or KVM virtual machine for running printer drivers, but I don’t really want to do that – and a significant portion of the potential customers don’t have the skill needed to do so.
While technically their claims about having Linux driver support are correct (they support some distributions of Linux on i386), the majority of new systems won’t work with it unless someone who has good skills spends some time and effort on it. Probably the majority of Linux Desktop and server systems that are in use today use AMD64 and are run by people who don’t know how to setup a chroot so therefore for most real installations it’s not supported. Even for i386 systems installation is unlikely to be trouble-free, when they support RPM based distributions (without identifying which of the many wildly different RPM systems they tested on) and Debian (without mentioning a version number) it seems that the incidence of people running a distribution that is supported is going to be quite low.
Based on this experience I am not inclined to trust Lexmark in future, I will not trust any future claims of Linux support that they may make. The above picture of the Lexmark box shows Tux (the Linux logo), it doesn’t mean support out of the box as you would hope, but instead means support for old systems with some effort.
Tom Wujec gave an interesting TED talk about training people in team-work and engineering through building the tallest possible structures from 20 pieces of spaghetti, 1 yard of string, and 1 yard of sticky-tape with a time limit of 18 minutes [1]. The project is completed by groups of four people – which is probably about the maximum number of hands that you could have on such a small structure at one time. They have a web site MarshmallowChallenge.com/ which gives some suggestions for conducting a challenge.
One interesting point made in the talk is that kindergarten students tend to do better than most adults.
I think it would be good to have such challenges at events such as Linux conferences. The type of people who attend such conferences tend to enjoy such challenges, and it may lead to some lessons in team-work that can help the software development process. Also we can discover whether Linux programmers are better than the typical kindergarten students. ;)
Good Things about LinkWithin
For the last 10 weeks I’ve been using the LinkWithin.com service to show links to other blog posts at the end of each post (the links are only shown to visitors of my blog not in the RSS feed, so people who read my posts through RSS syndication will miss this). The service shows excerpts of pictures from my blog at the bottom of each post to entice readers into reading other posts.
When you click on a LinkWithin icon on my blog you visit a LinkWithin page that redirects you back to my page, so people who use that show up as new visitors being referred by LinkWithin. Currently this month LinkWithin is the fourth highest referrer to my blog, below Google, Reddit, and WebWombat.com.au – so it is clearly doing some good in enticing people to read other posts that they might not otherwise read!
Bad Things about LinkWithin
The first problem with LinkWithin is that the WordPress plugin was written by people who don’t know much about WordPress. Unlike every other plugin I use it doesn’t support configuration options for the user in the database but instead has it hard coded in the PHP code! When you download a plugin from their web site it creates a custom zip that includes the PHP code automatically generated just for you! I have some friends using the same web server as me for running blogs, and I have to tell them “you can install any plugin apart from LinkWithin – it works for no-one but me”.
The next problem is that LinkWithin advertises that it will display related posts, it seems to be doing a poor job of that on my blog although admittedly only a minority of my blog posts have pictures so this limits what it has to work with. This has however inspired me to use more pictures in my posts.
Another problem is that it produces web pages that are not valid XHTML, the following patch fixes this.
--- /tmp/linkwithin.php 2010-02-22 02:09:47.000000000 +0000
+++ ./wp-content/plugins/linkwithin/linkwithin.php 2010-02-22 02:17:29.000000000 +0000
@@ -15,7 +15,7 @@
global $post, $wp_query, $linkwithin_code_start, $linkwithin_code_end;
$permalink = get_permalink($post->ID);
– $content .= '<div class="linkwithin_hook" id="'.$permalink.'"></div>';
+ $content .= '<div class="linkwithin_hook" id="'.str_replace('/','-',$permalink).'"></div>';
$content = linkwithin_add_code($content);
}
return $content;
@@ -26,13 +26,13 @@
global $post, $wp_query, $linkwithin_code_start, $linkwithin_code_end;
if ($wp_query->current_post + 1 == $wp_query->post_count) {
– $embed_code = '<script>
+ $embed_code = '<script type="text/javascript">
<!-- //LinkWithinCodeStart
var linkwithin_site_id = 151382;
var linkwithin_div_class = "linkwithin_hook";
//LinkWithinCodeEnd -->
</script>
-<script src="http://www.linkwithin.com/widget.js"></script>
+<script src="http://www.linkwithin.com/widget.js" type="text/javascript"></script>
<a href="http://www.linkwithin.com/"><img src="http://www.linkwithin.com/pixel.png" alt="Related Posts with Thumbnails" style="border: 0" /></a>';
$content .= $embed_code;
}
Finally LinkWithin shows up badly on the FireBug analysis (see my previous post about using Firebug to speed up my blog) [1] – see the below picture for details. As an aside, given that Google recommend Firebug it is rather ironic that Google Adsense related URLs cover the majority of the Firebug issues that are not caused by LinkWithin.
What Next?
I’ve sent email to the LinkWithin people about all these issues other than the FireBug problem reports, given that they haven’t responded to some suggestions for over 10 weeks it seems hardly worth my effort in informing them of other issues.
I’m thinking of trying OutBrain.com again. 18 monthe ago I tried OutBrain but never got it working due to technical issues and then forgot about it. It has some similar features and may work better – at least it has tech support people who respond to queries!
I previously described my experience with Computers and Parts Land (CPL) [1] who gave me a product that didn’t do what I wanted (because they thought that they knew better than me) and then gave me attitude when I returned it.
As it’s almost a year since that incident I had to buy something else from them to use the credit note as I decided that it’s not worth making a Trade Practices Act (TPA) [2] issue out of it. Thanks Tim for the suggestion though.
Firstly I went to their new store that is advertised on their web site. The people at the new store refused to honor the credit note (they probably hoped that I would just let it go and give them an extra $60 in profit). Claiming that I need to take a credit note back to the store it came from is bogus.
Anyway I went back to the original store and bought a new 1.5TB SATA hard drive which seems to work well enough. The service was really slow, I was the only customer in the store and there were several employees not doing much but it still took them ages to print a receipt and give me the hard drive.
It will be the last CPL purchase I ever make. In the unlikely situation that there is ever any new gear that is only sold by CPL then I will wait a year and buy it on ebay.
It would be good if someone started working as a TPA complainant. They would take donations from dis-satisfied customers who want to pay for an investigation of a shonky company (I’d pay $10 for an investigation of CPL). When enough donations were collected they would buy some stuff and make a video of every interaction with the employees and then launch a private legal action under the TPA if they do anything wrong. The TPA complainant would get to keep everything that they buy, any excess donation money after proving the case, and any money offered by the company to settle law suits. While it’s not a good use of my time and money to go after CPL directly it would be good to give some money to someone who would then see them dealt with properly.
Sam Harris gave an interesting TED talk about whether there are scientific answers to moral questions [1]. One of his insightful points was that when dealing with facts certain opinions should be excluded – it would be good if journalists who report on issues of science could understand this. Another insight was that religious people most strongly agree with him regarding the issue of whether there are factual answers to moral questions – but they think that God just handed the answers to their ancesters rather than making it an issue that requires consideration. He cites the issue of gay marriage as being a distraction from moral issues such as genocide and poverty. He asks “how have we convinced ourself that every culture has a point of view worth considering?”. He asks how the ignorance of the Taliban on the topic of physics is any less obvious than on the topic of human well-being.
Dan Gilbert gave an insightful TED talk titled “Why Are We Happy?” [2]. One interesting fact he cites is that people who become paraplegic are no less happy in the long term than people who win the lottery. He points out that a shopping mall full of Zen monks is not going to be particularly profitable and uses this fact to explain the promotion of natural happiness over synthetic happiness in our society.
Dan Barber gave an amusing and informative TED talk “How I Fell in Love with a Fish” [3]. He speaks about ecological fish farming and how the fish are more tasty as well as the farm being good for the environment. The farm in question is in the south-west of Spain, hopefully there will be more similar farms in other parts of the world soon.
Gary Lauder gave an interesting brief TED talk about road signs [4]. His main point was to advocate a road sign saying “take turns”, but there are already signs in the US at freeway on-ramps saying that 1 or 2 cars may enter every time the light turns green – which is a similar concept. The innovative thing he did was to estimate the amount of time and petrol wasted by stop signs, add that over a year based on the average income and then estimate that an annuity covering that ongoing expense would cost more than $2,000,000. This makes two stop signs at an intersection have an expense of $1,000,000 each. He suggests that rather than installing stop signs it would be cheaper to buy the adjacent land, chop down all trees, and then sell it again.
Alan Siegel gave an insightful TED talk about simplifying legal documents [5]. He gives an example of an IRS document which was analysed with a Heat Map to show which parts confused the readers – the IRS adopted a new document that his group designed which made it easier for taxpayers. He advocates legislation to make legal documents easier to understand for customers of financial services.
Tim Berners Lee gave an interesting TED talk about Open Data, he illustrated it with some fantastic videos showing how mashups have been used with government data [6] and how the Open Street Map project developed over time.
Martin F. Krafft gave an interesting Debconf talk about Tool Adoption Behavior in the Debian project [7]. One thing that I found particularly interesting was his description of the Delphi Method that he used to assemble a panel of experts and gather a consensus of opinion. The post-processing on this talk was very good, in some sections Martin’s presentation notes are shown on screen with the video of him in the corner. As an aside, I think we really do need camera-phones.
The Big Money has an interesting article comparing the Mafia “Bust Out” with the practices of US banks [8].
Mark Roth gave an exciting TED talk about using Hydrogen Sulphide to trigger suspended animation [9]. They are now doing human trials for suspending people who have serious injuries to reduce tissue damage during the process of surgery.
Pawan Sinha gave an interesting TED talk about how brains learn to see [10]. He started by talking about curing blindness in people who have been blind since birth. But he then ended by showing some research into the correlation between visual processing and Autism, he showed that an Autistic child had significantly different visual patterns when playing Pong to an NT child.
Adora Svitak gave an insightful TED talk about what adults can learn from kids [11]. She made some particularly interesting points about the education system requiring that adults respect children more and expect them to do better than their parents – which is essential for all progress in society.
The NY Times has an interesting article on animal homosexuality [12]. In terms of research it focusses on lesbian relationships between albatrosses. But a large part of the article is devoted to the politics of scientific research into animal sexuality.
BrowserShots.org shows you what your web site looks like in different web browsers [13].
Cory Doctorow wrote an insightful article titles “Can You Survive a Benevolent Dictatorship” about the Apple DRM [14]. He describes the way the Apple Digital Restrictions Management (DRM) doesn’t stop copyright violation but does reduce competition in the computer industry. He is not going to sell his work on the Apple store (for the iPad or iPhone etc) and suggests that customers should choose a more open platform. It’s unfortunate that he didn’t suggest a better platform.
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