I was reading an article on C startup, and it refers to the function __libc_csu_init. Could anyone tell me what CSU stands for?
I found a reference to "C start up" in the libc mailing list.
It's far from definitive, but I imagine it's probably correct given what the function does.
Related
I see that there are syslog(2) and syslog(3).
https://man7.org/linux/man-pages/man2/syslog.2.html
https://man7.org/linux/man-pages/man3/syslog.3.html
Since they have the same function time, I don't see how the linker can distinguish them at link time. Could anybody help me understand how the linker correctly resolve the object code under the hood? Thanks.
It doesn't.. syslog(2) has to be called using klogctl() wrapper or using syscall() at your own peril.. syslog(3) is the only definition present in the C library.
I try to understand how to use the debug mode in wxmaxima. In the documentation is specified "See MACDOC;TRDEBG USAGE for more information. Consult GJC for more help".
I can't find the reference to "MACDOC;TRDEBG USAGE" nor "GJC". Could you help me please?
Wow, that's a good one. I believe GJC is George J. Carrette (?) who worked on Macsyma (the precursor to Maxima) about 40 years ago. MACDOC;TRDEBUG USAGE is a reference to a file on an ancient filesystem. There may be a file named trdebug.usg or something like that floating around; I haven't looked.
I think you will find most or all of the existing documentation for debugging in the section titled "Debugging" in the reference manual. Here it is online: http://maxima.sourceforge.net/docs/manual/maxima_38.html I think that the same documentation is also included in wxMaxima.
By the way, where did you find the reference to MACDOC?
(Mathematica version: 8.0.4)
lst = Names["Internal`*"];
Length[lst]
Pick[lst, StringMatchQ[lst, "*Bag*"]]
gives
293
{"Internal`Bag", "Internal`BagLength", "Internal`BagPart", "Internal`StuffBag"}
The Mathematica guidebook for programming By Michael Trott, page 494 says on the Internal context
"But similar to Experimental` context, no guarantee exists that the behavior and syntax of the functions will still be available in later versions of Mathematica"
Also, here is a mention of Bag functions:
Implementing a Quadtree in Mathematica
But since I've seen number of Mathematica experts here suggest Internal`Bag functions and use them themselves, I am assuming it would be sort of safe to use them in actual code? and if so, I have the following question:
Where can I find a more official description of these functions (the API, etc..) like one finds in documenation center? There is nothing now about them now
??Internal`Bag
Internal`Bag
Attributes[Internal`Bag]={Protected}
If I am to start using them, I find it hard to learn about new functions by just looking at some examples and trial and error to see what they do. I wonder if someone here might have a more complete and self contained document on the use of these, describe the API and such more than what is out there already or a link to such place.
The Internal context is exactly what its name says: Meant for internal use by Wolfram developers.
This means, among other things, the following things hold about anything you might find in there:
You most likely won't be able to find any official documentation on it, as it's not meant to be used by the public.
It's not necessarily as robust about invalid arguments. (Crashing the kernel can easily happen on some of them.)
The API may change without notice.
The function may disappear completely without notice.
Now, in practice some of them may be reasonably stable, but I would strongly advise you to steer away from them. Using undocumented APIs can easily leave you in for a lot of pain and a nasty surprise in the future.
I just installed the scheme48 package from macports and have started experiencing. I was watching this youtube video, link here and was attempting to perform some of the examples. In the lecture the professor is running scheme on a Sun terminal. For example, I attempt to do '(first 473)' and get 'Error: undefined variable first'. Now, I'm assuming I haven't loaded the correct package / library or what ever it is called in scheme but am not sure what the syntax and library is. I believe that scheme48 and the scheme version on that sun terminal in the video are not the same and could be part of the problem.
So, what library do I need to use and how do I load it?
Those lecture notes are based on a book called Simply Scheme, and you can find the library code that is used in the book here. Specifically, you need simply.scm.
(But whether it is a good idea to have these kind of overloading functions is debatable. Specifically, note that first is used in a way that is different from many other languages.)
Is there a reference website to look up syntax for Scheme library function like http://www.cplusplus.com/reference/?
I'm looking for syntax of fold, but google gave me nothing :(
Thanks,
fold is from SRFI 1. Many functions have good documentation if you know where it "comes from".
Also, since you're using Racket (as mentioned in your previous questions), you should check out the Racket documentation. It has a very nice search facility. (Also, you might like to know about Racket's foldl, which is identical to SRFI 1's fold.)