users September 2010

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Frontend for traceroute
by Mickey 27 Sep '10

27 Sep '10

FC13 Is there a Frontend for Traceroute in the Fedora repo's ?

2 2

Computing cpu's clock in cycles per second
by JD 26 Sep '10

26 Sep '10

Since I have not been successful to determine the runtime cpu frequency using the fedora tools: $ sudo /usr/bin/cpufreq-info -f $ sudo /usr/bin/cpufreq-info -w $ They come up empty. So, I wrote a simple program to determine an approximate value for the number of cycles per second. The algorithm is simple. Start an one shot interval timer for N seconds (can be an arg to the program), and M microseconds (can be an arg to the program). The interval timer can be virtual (-v arg to the program) or realtime (-r arg to the program). be sure to set up a proper handler routine for the SIGALRM or SIGVTALRM, depending on -v or -r. More on this later.... then simply run a loop that increments count (type unsigned long, initialized to 0) until the global var intr becomes none zero. Now, how many instructions were executed just for the loop. When I compiled the program with -S to see the assembler output, it turns out to be a total of 7 instructions for the loop. Now, let's assume each of the 7 instructions takes 2 or 3 cpu cycles. Lets say N cycles average per instruction. so now you have count * 7 * N total cycles in the loop. Divide that by the total number of seconds you set the timer for, and you will get a pretty close approximation of the actual runtime cpu clock (per second). Now, about the type of the interval timer. 1. I found that using the virtual interval timer yielded wrong values for count. Every time and each time it varies by thousand and sometimes millions. 2. That leaves the realtime interval timer. 3. In order to get a very close approximation to a realtime interval timer AND have a much more realistic value for the "count", the program must be run as root, and niced to --20, like so: sudo nice --20 ./freq -s120 -u0 -r says run the program at the highest nice value, for 120 seconds and 0 microseconds with realtime interval timer. In my program I do not bother to do the division, because I have no idea what each different cpu's instructions cycles are for the specific 6 instruction in the loop. I use bc after the program prints the count to do the math with long precision (scale=20) The loop looks like this: while (intr == 0) count++; In assembly, it looks like this: jmp .L25 ---------------------+ .L26: | movl count, %eax | addl $1, %eax | movl %eax, count | .L25: | movl intr, %eax | testl %eax, %eax | je .L26 ---------------------+ Here's the program. I hope some folks on this list more familiar with realtime programming can enhance it and share it with the rest of us. /* Program to compute the approximate cycles per second of a cpu clock */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <signal.h> #include <getopt.h> #include <sys/time.h> #include <sys/timeb.h> #define TWO_MINUTES (120) // seconds extern char *optarg; extern int optind, opterr, optopt; struct itimerval itv0; struct timeb t0, t1; long tv_sec = -1, tv_usec = -1; struct sigaction doit; unsigned count = 0; int intr = 0; void alarm_handler(int sig) { intr = 1; } void error(char *s) { fprintf(stderr, "illegal option %s\n", (s == NULL) ? "unknown" : s); _exit(-1); } prt(int c) { fprintf(stderr, "saw option %c\n", c); } main(int ac, char *av[]) { int opt; unsigned ms; unsigned itimer = -1; sleep(60); while ((opt = getopt(ac, av, "rs:u:v")) != -1) { switch(opt) { case 's': prt('s'); tv_sec = atol(optarg); break; case 'u': prt('u'); tv_usec = atol(optarg); break; case 'r': prt('r'); itimer = ITIMER_REAL; break; case 'v': prt('v'); itimer = ITIMER_VIRTUAL; break; default: prt('?'); break; //error(optarg); } } if (tv_sec == -1) tv_sec = TWO_MINUTES; // 120 seconds. if (tv_usec == -1) tv_usec = 0; if (itimer == -1) itimer = ITIMER_REAL; itv0.it_value.tv_sec = tv_sec; itv0.it_value.tv_usec = tv_usec; itv0.it_interval.tv_sec = (long)0; itv0.it_interval.tv_usec = (long)0; doit.sa_handler = alarm_handler; if (itimer == ITIMER_VIRTUAL) sigaction(SIGVTALRM, &doit, (struct sigaction *)NULL); else sigaction(SIGALRM, &doit, (struct sigaction *)NULL); ftime(&t0); if (itimer == ITIMER_VIRTUAL) setitimer(ITIMER_VIRTUAL, &itv0, (struct itimerval *)NULL); else setitimer(ITIMER_REAL, &itv0, (struct itimerval *)NULL); while(intr == 0) count++; ftime(&t1); ms = ((unsigned)t1.time * 1000 + (unsigned)t1.millitm) - ((unsigned)t0.time * 1000 + (unsigned)t0.millitm); fprintf(stderr, "alarm after %u milliseconds \n", ms); // Above fprintf is just to show that the timer indeed ran for the specified // number of seconds. printf("count = %u\n", count); }

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mplayer fullscreen width and height
by Dj YB 26 Sep '10

26 Sep '10

Hello, whenever I toggle fulldcreen in mplayer the video is scaled so that the height of the video fit the screen, thus cropping some of the video since the with of the screen is smaller then the scaled video with. how can I tell mplayer to scale the video to fit the smaller dimension of the screen (or something like that) so that the image wont get cropped. Thanks, YB.

1 1

Weird Network Manager Problem
by mike 26 Sep '10

26 Sep '10

This all started with a power out crash thanks to my Electrical Company. After power came back up I could not access the server via the network. When I first got to the console I could not log in as root nor could if do an "su" as my user log in. Using Webmin via localhost I found the password hosed but I was able to reset the password via Webmin and after a reboot I could log in as root. I then found I could not ping my static IP from inside or outside. Using the GUI at System/Administration/Network and checking the Interface settings they were correct. If I hit the DNS tab or the Hosts tab I found bogus information. I changed it back to the correct info and did a save followed by a Stop/Start on the interface and gave control back to Network Manager. After a reboot the bogus info had returned! I could only ping from the inside the bogus IP address and of course could not ping it from the outside! So I manually went to /etc/hosts and corrected the bogus info that had a note "Added by Network Manager". I also check /etc/resolv.conf and corrected the bogus DNS info. I checked /etc/sysconfig/networking/devices/ifcfg-eth0 and the info there was correct. Reboot and all the bogus info is back, all with the "Added by Network Manager" caveat! Beat the bushes as well as I can I can find no info as to where Network Manage conf files might be named and or located! Anyone have any idea where they are or am I just going to have to kill Network Manager? This one is weird!

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Weird Network Manager Problem (Updated)
by mike 26 Sep '10

26 Sep '10

JB, I figured you or someone else might like to know this. I killed the dhc process and cleaned up the .conf files did a restart on Network Manage and everything worked! Ran chkrootkit and it hit on netstat as Infected (imagine that). It also reported a possible LKM Trojan intrusion. I then ran rkhunter and it threw warnings on the following files: /bin/netstat /bin/ps /usr/bin/top /usr/bin/lsof It also reported undocumented password change and group file changes. Password I could see with me going through Webmin to reset the root password but, I was careful to change nothing else much less groups! I rebooted and the problem was back just as before! With that I threw up my hands and have WipeDrive going on the drives in DoD mode! Hope this might help someone! Again thanks for the help!

5 12

saving mixer settings on shutdown/restoring on startup
by Andre Robatino 26 Sep '10

26 Sep '10

On shutdown, mixer settings are automatically saved with alsactl store. (There is a bug in alsa-utils that keeps this from working - https://bugzilla.redhat.com/show_bug.cgi?id=637291 - but it's easy to work around.) However, I don't see anything that restores mixer settings on startup. Is this an initscripts bug?

1 1

Mapping Key for keyboard with no regular insert key?
by Michael D. Setzer II 26 Sep '10

26 Sep '10

Got some labs that have Logitec Internet keyboards that for some reason don't have an insert key above the regular arrow keys. For some reason it has a large delete key? With most programs one can turn off num lock and use that insert key, but had the windows tn5250 program that would not, so had to come up with a reg hack, and mapped the context menu button next to Ctrl on Rigth to Insert. Was looking to do something similar for something similar for linux, since machines also have Fedora 12. Thanks.

2 2

gpg and gnome
by Genes MailLists 26 Sep '10

26 Sep '10

What is the gnome equivalent of kgpg ? thanks! gene/

3 2

Unable to blank DVD+R R/W
by JD 26 Sep '10

26 Sep '10

Have HP DVD/RW (DVD+R) 16X. It is an orange colored back, and the recording surface is blue. It was recorded using a windows software. My DVD-R/W drive is an 8X drive for DVD write, 4x DVD Rewrite, and 24X for CD. Now I tried to erase it: $ sudo wodim dev=/dev/sr0 blank=all -force Device type : Removable CD-ROM Version : 5 Response Format: 2 Capabilities : Vendor_info : 'Slimtype' Identification : 'DVD A DS8A1P ' Revision : 'CX17' Device seems to be: Generic mmc2 DVD-R/DVD-RW. Using generic SCSI-3/mmc DVD-R(W) driver (mmc_mdvd). Driver flags : SWABAUDIO BURNFREE Supported modes: PACKET SAO Speed set to 11080 KB/s Waiting for drive to calm down. Starting to write CD/DVD at speed 8.0 in real force BLANK mode for single session. Last chance to quit, starting real write in 0 seconds. Operation starts. Errno: 5 (Input/output error), blank unit scsi sendcmd: no error CDB: A1 00 00 00 00 00 00 00 00 00 00 00 status: 0x2 (CHECK CONDITION) Sense Bytes: 70 00 05 00 00 00 00 0A 00 00 00 00 30 05 00 00 Sense Key: 0x5 Illegal Request, Segment 0 Sense Code: 0x30 Qual 0x05 (cannot write medium - incompatible format) Fru 0x0 Sense flags: Blk 0 (not valid) cmd finished after 0.117s timeout 9600s Starting to write CD/DVD at speed 8.0 in real force BLANK mode for single session. No chance to quit anymore. Operation starts. Errno: 5 (Input/output error), blank unit scsi sendcmd: no error CDB: A1 00 00 00 00 00 00 00 00 00 00 00 status: 0x2 (CHECK CONDITION) Sense Bytes: 70 00 05 00 00 00 00 0A 00 00 00 00 30 05 00 00 Sense Key: 0x5 Illegal Request, Segment 0 Sense Code: 0x30 Qual 0x05 (cannot write medium - incompatible format) Fru 0x0 Sense flags: Blk 0 (not valid) cmd finished after 0.001s timeout 9600s wodim: Cannot blank disk, aborting.

9 20

Enabling Airport wireless on Macbook Air with F12
by Colin Paul Adams 25 Sep '10

25 Sep '10

Thanks to Chris Smart, Peter Danenberg and others, I have been able to install Fedora 12 as the sole O/S on my Macbook Air (first generation). However the wirless networking is not enabled. I am following the instructions in http://docs.fedoraproject.org/wireless-guide/f12/en-US/html-single/#chap-Wi… . There was no wireless device shown in the network Configuration, so I clicked New and added a device for hardware Apple Airport. I also tried adding wireless device on the Hardware tab (eth0), but although it allows me to do this, after I save and then reopen the Network Configuration, the hardware only shows a device pan0 of Type Ethernet (which was there from the start). It does appear on the Devices tab (it didn't originally until I added it), but has staus of inactive, and no means to activate it. However, even after restarting the computer, the wireless icon on the panel says there are no network devices available. So I tried removing the device from control by NetworkManager, and activated it manually. But then I get: Device eth0 does seem to be present, delaying initalization. What do I need to do? -- Colin Adams Preston Lancashire

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