December 2003 - Legacy - lists.gtalug.org

Compiling the 2.6 kernel
by jingsu-26n5VD7DAF2Tm46uYYfjYg＠public.gmane.org 25 Dec '03

25 Dec '03

> Any suggestions or readings would be of help. I too decided to play with 2.6 for the day, though I got frustrated and stopped. Anyone know what the deal with the new modules is? Based on some browsing of newsgroups via google, it seems that a new module loader is needed? (I'm using the one shipped with RH8). Anyways, I went and got the latest/greatest non-development version of the module loader. modules.conf has been replaced with modprobe.conf, and modprobe.devfs. Haven't quite figured out these things yet. Anyways, I've been getting module dependency errors and they refuse to load when I boot the new kernel.... still investigating it though, to figure out what's going wrong. As for initrd, I found that it's mostly used for scsi systems. Atleast it's true in my case. I needed to pack up the the scsi board module into the initrd image. After a while, I found the whole process of initrd creation to be annoying, and just compiled the scsi driver into the kernel itself, and did a regular boot without initrd. -Jing -- The Toronto Linux Users Group. Meetings: http://tlug.ss.org TLUG requests: Linux topics, No HTML, wrap text below 80 columns How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml

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Compiling the 2.6 kernel
by pking123-rieW9WUcm8FFJ04o6PK0Fg＠public.gmane.org 25 Dec '03

25 Dec '03

I decided to celebrate Christmas by compiling a version 2.6 kernel. :-) I have done several compiles before, but still have a few questions about this compile. First, I noticed that my OS (Debian 3) uses initrd by default. This is my first compile using initrd. From what I have been reading regarding initrd, it is really a filesystem-in-a-file, and the default one I have uses cramfs. Documentation I have on initird suggest ext2 or minix, so I guess it really doesn't matter about what the filesystem is. When I mounted my default initrd using loopback, it looks as though there is a directory for modules in there. Initrd also appears to contain an ash script called linuxrc. Now, from what I understand about UNIX architecture, doesn't ash (or any shell) require a kernel underneath? So why don't I just toss initrd and boot straight into the kernel I was going to use anyway? This is what I am accustomed to doing in just about every other compilation I have done.Why the extra layer of bureaucracy? As for the modules, how do I know which modules to put in there? I recognise the "benefit" of initrd is to selectively install modules in a way that does not cause conflicts with other modules. So, I guess that means I can't include all of them. :-) Nevertheless, I have created the beginnings of my own initrd, but am at a loss as to the modules, and how to write modules.conf. Any suggestions or readings would be of help. THanks Paul King -- The Toronto Linux Users Group. Meetings: http://tlug.ss.org TLUG requests: Linux topics, No HTML, wrap text below 80 columns How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml

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[xawtv and webcam looping]
by mr6re9-mI4xJ4qlgtBiLUuM0BA3LQ＠public.gmane.org 25 Dec '03

25 Dec '03

On Thursday 25 December 2003 11:28, GDHough wrote: > > >>gspy is designed for webcam based security and may offer fewer > > >> headaches > > Maybe, let's see... > Yes...a dozen or so devel-packages later and it's a perfect Christmas gift. Thanks, farmer6re9 -- Eating Crow is better with MyCrowSauce -- The Toronto Linux Users Group. Meetings: http://tlug.ss.org TLUG requests: Linux topics, No HTML, wrap text below 80 columns How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml

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Formatting in C++
by jingsu-26n5VD7DAF2Tm46uYYfjYg＠public.gmane.org 25 Dec '03

25 Dec '03

> > #include<iomanip> > > > > cout.setf(std::ios::fixed | std::ios::hex); > > cout << std::setprecision(2) << buf[i]; > I tried this before; it compiles without any complaint, but gives garbage > output. > I tried Google, but no relevent info. > John I tried a short example, which seemed to work... snippet below. The only catch I found was I had to cast the number. I think the operator overload is sending the number into the character interpretor instead of the numeric interpretor. std::cout << setw(2) << (unsigned int)std::hex << buf[i]; that seemed to do the trick. Shows the number as hex, space filling to right align the output at two spaces. -- The Toronto Linux Users Group. Meetings: http://tlug.ss.org TLUG requests: Linux topics, No HTML, wrap text below 80 columns How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml

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urpmi and apt-get
by pjc-6duGhz7i8susTnJN9+BGXg＠public.gmane.org 25 Dec '03

25 Dec '03

I argee 100% Debian and more so Libranet is a brilliant way to go, Libranet is great because of the tools Merv mentioned along with Nvidia drivers,True type fonts,java&flash plugins just to name a few more all available via Libranet's "Adminmenu". I have been using it now for about a year and it's great! apt just rules in my opinion..... On Thu, 2003-12-25 at 15:34, Merv Curley wrote: > On December 25, 2003 10:12 am, JoeHill wrote: > > > If you mean GUI config tools, I don't really use all those GUI tools that > > come with Mandrake anyway, I'm much more comfy at the CLI with > > configuration, so I can see what's going on in detail. The main thing I'm > > looking for is great package management and stability. I miss the old MDK > > 9.1 days, uptimes of 2 weeks or more were not unheard of... :-( > > Well if you would like to try a Debian system, there is an outfit in > Vancouver, Canada who have added a few tools of their own and sell a Deb > system that is a mixture of stable and unstable branches. This computer > has gone 2 months uptime and then rebooted cuz I did something stupid. > > Apt-get can frustrate at first but it does a very good job at handling all > dependencies. Libranet supplies a utility that does a kernel upgrade and > all the updating of grub etc. Debian is known for stability if you stay > with programs in the stable branch. Not many of us do, gotta have the > latest and greatest. > > The last version is free but outdated now. The current is priced less than > Mandrake. Take a look a libranet.com. > > Cheers -- The Toronto Linux Users Group. Meetings: http://tlug.ss.org TLUG requests: Linux topics, No HTML, wrap text below 80 columns How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml

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Formatting in C++
by wildberger-iRg7kjdsKiH3fQ9qLvQP4Q＠public.gmane.org 25 Dec '03

25 Dec '03

On December 25, 2003 08:51 pm, Jing Su wrote: > > How can I use cout <<... to perform the equivalent to > > printf( " %.2X ",buf[i] ); > > when buf[] was declared as uint8_t buf[] ; > > and the content of buf[i] are hex numbers like 0x5e, or 0xfd, etc ? > > I think that I would have to include #include <iomanip> ,but I am at a > > loss how to accomplish the formatting. > > John > > #include<iomanip> > > cout.setf(std::ios::fixed | std::ios::hex); > cout << std::setprecision(2) << buf[i]; I tried this before; it compiles without any complaint, but gives garbage output. I tried Google, but no relevent info. John -- The Toronto Linux Users Group. Meetings: http://tlug.ss.org TLUG requests: Linux topics, No HTML, wrap text below 80 columns How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml

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Formatting in C++
by jingsu-26n5VD7DAF2Tm46uYYfjYg＠public.gmane.org 25 Dec '03

25 Dec '03

> How can I use cout <<... to perform the equivalent to > printf( " %.2X ",buf[i] ); > when buf[] was declared as uint8_t buf[] ; > and the content of buf[i] are hex numbers like 0x5e, or 0xfd, etc ? > I think that I would have to include #include <iomanip> ,but I am at a loss > how to accomplish the formatting. > John #include<iomanip> cout.setf(std::ios::fixed | std::ios::hex); cout << std::setprecision(2) << buf[i]; at least that's off the top of my head... I think that's right... I'm sure that a quick google search will fill in the blanks if the above doesn't compile or do the right thing... -Jing -- The Toronto Linux Users Group. Meetings: http://tlug.ss.org TLUG requests: Linux topics, No HTML, wrap text below 80 columns How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml

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Formatting in C++
by wildberger-iRg7kjdsKiH3fQ9qLvQP4Q＠public.gmane.org 25 Dec '03

25 Dec '03

How can I use cout <<... to perform the equivalent to printf( " %.2X ",buf[i] ); when buf[] was declared as uint8_t buf[] ; and the content of buf[i] are hex numbers like 0x5e, or 0xfd, etc ? I think that I would have to include #include <iomanip> ,but I am at a loss how to accomplish the formatting. John -- The Toronto Linux Users Group. Meetings: http://tlug.ss.org TLUG requests: Linux topics, No HTML, wrap text below 80 columns How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml

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C programming question
by wildberger-iRg7kjdsKiH3fQ9qLvQP4Q＠public.gmane.org 25 Dec '03

25 Dec '03

On December 24, 2003 12:41 pm, Tim Writer wrote: > A better way to write this is to use C99's exact size types (from > <inttypes.h>): I followed your advice and modified the program accordingly ___________________________________________________ /* mem_displ.cpp * Original program 'mem.c' by Greg Franks Dec 22 2003 * modified, converted to C++ and commented by J.Wildberger * execute with: ./mem_displ + arg (memloc in decimal number) * compile with: c++ -o mem_displ mem_displ.cpp */ #include <iostream> #include <fcntl.h> //required for O_RDONLY #include <unistd.h> //required for lseek #include <iomanip> //required for setbase #include <inttypes.h> //required for uint16_t using namespace std; int main(int argc, char *argv[] ) { int i; int max=10; // display 10 bytes starting at specified offset if (argc != 2) { cout <<"Specify memory offset from zero"<<endl; exit (1); } int n=atoi(argv[1]); int fd = open( "/dev/mem", O_RDONLY ); //open for read only if ( fd < 0 ) { perror( "Cannot open /dev/mem: " ); exit( 1 ); } else { off_t offset = lseek( fd, n, SEEK_SET ); // fd ..file descriptor // n ..number of offset bytes // SEEK_SET ..the file offset shall be set to offset bytes if ( offset == (off_t)-1 ) { perror( "Seek: " ); exit( 1 ); } else { uint8_t buf[max]; //unsigned char size_t nbytes; ssize_t bytes_read; nbytes = sizeof(buf); bytes_read= read( fd, buf, nbytes); cout <<"At offset "<<n<< " :"; for (i=0; i<max; i++) printf(" %.2X ",buf[i]); //%.2X display hex in width of 2 } } exit ( 0 ); } ./mem_displ 20 ==> At offset 20 : 54 FF 00 F0 57 FF 00 F0 5A FF ***************************************************************************** > > On December 23, 2003 06:45 pm, Matthew Rice wrote: > > > And this is better : > > > > > > od -j 20 -N100 -t x2 /dev/mem ( I modified this from 2 to 100 and offset 20) ==> 0000000 0001 0000 ff5a f000 e2c3 f000 ff5a f000 0000020 ff5a f000 ff54 f000 ff57 f000 ff5a f000 0000040 fea5 f000 e987 f000 007c f000 007c f000 0000060 007c f000 007c f000 ef57 f000 007c f000 0000100 0014 c000 f84d f000 f841 f000 e024 f000 0000120 e739 f000 f859 f000 e82e f000 efd2 f000 0000140 ff53 f000 0000144 This might be shorter, but very confusing. Note the numbering for each line. It is double of what it should be.(2 times hex) Also the bytes are grouped in double bytes, the higher byte first, followed by lower byte. Compare this with the above result, that shows the proper sequence of bytes. ******************************************************************************** I am now happy to report, that it *IS* possible to display physical memory in a working Linux system. The "why" is a different issue. John -- The Toronto Linux Users Group. Meetings: http://tlug.ss.org TLUG requests: Linux topics, No HTML, wrap text below 80 columns How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml

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urpmi and apt-get
by mervc-MwcKTmeKVNQ＠public.gmane.org 25 Dec '03

25 Dec '03

On December 25, 2003 10:12 am, JoeHill wrote: > If you mean GUI config tools, I don't really use all those GUI tools that > come with Mandrake anyway, I'm much more comfy at the CLI with > configuration, so I can see what's going on in detail. The main thing I'm > looking for is great package management and stability. I miss the old MDK > 9.1 days, uptimes of 2 weeks or more were not unheard of... :-( Well if you would like to try a Debian system, there is an outfit in Vancouver, Canada who have added a few tools of their own and sell a Deb system that is a mixture of stable and unstable branches. This computer has gone 2 months uptime and then rebooted cuz I did something stupid. Apt-get can frustrate at first but it does a very good job at handling all dependencies. Libranet supplies a utility that does a kernel upgrade and all the updating of grub etc. Debian is known for stability if you stay with programs in the stable branch. Not many of us do, gotta have the latest and greatest. The last version is free but outdated now. The current is priced less than Mandrake. Take a look a libranet.com. Cheers -- Merv Curley Scarborough, Ont Libranet Linux 2.8 KDE 3.1.4 KMail 1.5.4 -- The Toronto Linux Users Group. Meetings: http://tlug.ss.org TLUG requests: Linux topics, No HTML, wrap text below 80 columns How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml

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