Welcome to The Linux Page

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This site is a collection of my own work with Linux. Certain things are easy, others take time to decipher and if I ever need to repeat the work (which usually happens!), then I need to remember everything by memory or... have a site with all the steps taken and to take again.

The following are my most recent posts:

Ada Variables

Ada variables are complex objects. When developing a compiler, you must definitively take that in account. You have several sides to your variables: one you need to be able to handle dynamic variables since the compiler will have to be capable of doing all the operations on all the constant variables just as if you were executing your program and it has to handle all the tests necessary to ensure integrity.

So... we need a library that can handle integers, a library to handle floating points, a library to handle arrays, etc.

MySQL CREATE USER features!

Today, I had to fix an installation of MySQL.

There were several problems, and I finally got it to work. Somehow, I had to run some commands manually to cleanly shutdown the cluster server and then re-run the configuration script with dpkg:

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Today, as I was working with Coverity, I got this one message...

Negative constant passed to a negative sink.

Although I understood the meaning, I thought that this message was very confusing, How about:

Unexpected negative value in parameter #<position>

TOC test without editor

title 1

Test A

title 2

Testing B

title 3

Weird format

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Auto-Vacuum not working? (and solution)

Since I manage multiple computers and each run a PostgreSQL database system, I can see discrepancies between versions. (i.e. newer versions fix problems in older versions.)

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Today I ran in an error that looked like this:

Invalid argument supplied for foreach() in <path>/modules/taxonomy/taxonomy.module on line 1214.

The line number may vary depending on the version you are using. At the time, I had Drupal 6.14 and the line number was 1214.

The problem is with a node that has an invalid definition of its taxonomy field. In other words, the $node->taxonomy is not defined. If it were an empty array, the function would not fail.

I was updating a new Drupal website from an old static website generating nodes automatically with a little module. There were a ...

OpenSSL and PostgreSQL conflict in PHP

All of last week I've been looking for the solution to a bug in one of my numerous websites.

The problem was that after registering, a user would get an error saying that the PostgreSQL connection was lost. I had never had that with Drupal and yet, it would be 100% consistent.

I tested the new code several times and had no problems with it, so I was really dismayed that all of a sudden it stopped working.

After quite some time, I finally decided that my new code was the culprit. Weird. It was. It does the same thing as one of the Core modules and yet it breaks the PostgreSQL ...

I've got those 3 button mice from SGI as I was working with Indy's and O2's. I also have keyboards. Those are real good quality!

Yesterday, I tried to right click and somehow, nothing happened. At first I thought maybe it was X going banana, but trying again and restarting did not change anything. I reset my KVM too, just in case. Still nothing.

Using your firewall with Postfix

After a little while (very little) our mail server gets quite clogged. It does not cause much problem to our server, however, legal mail server will have a hard time to connect because all of those illegal mail server connect thousands of times to try sending us spam.

To give you an example, I blocked less than 10 IPs today and I got over 5,000 hits blocked within about 12 hours. That's to give you a picture of the badness of those scam robots.

I thus looked for a solution to automatically block those IPs. I found two things, one is a shell script. I do not recommend it since it is ...

wsprintf() limit under MS-Windows

Today I wanted to check out a set of floating value in my Visual C++ development environment.

You can use the OutputDebugString() to print a debug string in the VC++ output window when running a software. This is quite handy, but when working in C++, string handling can be tedious. I need to create a message and wrote something similar to this:

wchar_t msg[128];
swprintf(msg, "Float: %f\n", my_float);
...

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Unfreeze your Mouse when it Froze

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