Ubuntu Multimedia :: Starting Jack - Bad File Descriptor

Dec 10, 2010

I am having problems starting jack everytime I try to start it either says bad file descriptor a bunch times or it wont connect to server as client sometime. Other times It just say sorry cannot start jack.

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Ubuntu Multimedia :: Jack Not Starting In KXstudio

Apr 24, 2011

I just installed KXstudio and I got everything else working on my system but I can't seem to get jack to start. When I check the message screen it doesn't plainly tell me where things are going wrong. The message box reads...
22:10:53.564 Patchbay deactivated.
22:10:53.568 Statistics reset.
22:10:53.607 ALSA connection change.
22:10:53.614 D-BUS: Service is available (org.jackaudio.service aka jackdbus).
Cannot connect to server socket err = No such file or directory
Cannot connect to server socket .....
22:10:58.968 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server socket
Jack server is not running or cannot be started.

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Server :: Find The List Of File Being Tagged By User Jack Starting From A Given Date?

Mar 27, 2011

I need to find the list of file being tagged by user jack starting from a given date.Eg:Tag Name:lcc_dev_p1User: jackDate: >= 2011-03-02can some done tell me what is the cvs command for this.Should the below command give the correct outputcvs log -R -S -N -rlcc_dev_p1 -d">=2011-03-13" -wjack > /tmp/output.txt

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Ubuntu Multimedia :: Via Vt1708s Azalia No Sound When Starting Jack Sound Server?

Jun 7, 2011

After installing I was not able to get many of the audio programmes to work. After some reading, I realised that this was probably due to jack not starting.

I was unable to get jack to start normally but have been able to get it started with the playback only option selected. Programmes that use jack now work, however there is no sound once jack has been started. The sound does work in other programs when jack is not started. Strangely, I only have to open qjackctl for the sound to stop, and jack is not even started. Initially I thought these problems were due to my sound card not being supported, but I believe that alsa support was added for the via 1708 codec at some point. I found that support had been added in a document showing the changes between alsa versions; however I cannot find the exact model listed as a supported sound card on the alsa site.

I believe that altering jack settings could fix the problem, as i have been able to get audio to work in hydrogen by selecting plughw:0 but there is still no sound in other programs. I have tried altering many other settings but to no avail, however I do not really understand the meaning of the settings that i am adjusting.

Does anyone know what settings to adjust or know something else that might fix this problem so that sound works once jack has been started?

Also, would programmes that use jack such as audacity, hydrogen, and ardour work with pulseaudio as the main sound server if I were to install normal ubuntu - it might be worth seeing if my soundcard works with the puleaudio sound server

if this helps, here is the error message received when jack does not start when the normal duplex option is selected.

21:24:04.867 Patchbay deactivated.
21:24:04.868 Statistics reset.
21:24:04.886 ALSA connection change.
Cannot connect to server socket err = Connection refused


also, when i open alsamixer in the terminal for some reason the headphone part is greyed out, even when the sound is working before qjackctl is opened.

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Ubuntu Multimedia :: Jack And "Muse Failed To Find A Jack Audio Server"

Jun 27, 2011

I've got an Acer Aspire 5101 with Natty on it and everything works so far, but I can't start Muse. It says: "Muse failed to find a jack audio server". At the bottom it also says: "...if Jack was started check if it was started as the same user as Muse". This might be the issue. But how can I check this? BTW: Jackd has been installed and I am a Member of the Audio Group.

I am new to Ubuntu and don't know how to fix this. I got this Notebook for free, because my Brother wanted to dispose it as it didn't worked properly after he reinstalled xp. Only the dvd-drive is broken, the rest is in really good condition for such an old thing. After a lot of trial and error I could finally install Natty from USB.

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General :: Open Local File Error When Creating File Descriptor?

Sep 14, 2009

error message when I ran my program that I couldn't open my local file. I have two files first one is called client, second one is called server I am using named pipes to sent a message from client to the other file called server in client I used mknod() to create the two named pipes,one for read,one for write and created new thread in client using fork() spawned a child process that executed the server file both named pipes are opened the client file got the message from the user and sent it through the named pipes to the server file when the server receives the message , it needs to verfify it is correct in the server file, a local file descriptor is created to read and send this verifing message when it is not correct but I am getting an OPEN() error when I tried to open this shared local array buff and attach it to a file descriptor where the message is kept why do I get this error in server file

int main()
/*both named pipes are open*/


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Programming :: Get File Descriptor Of An Already Opened File?

Jul 20, 2011

Is there any method to get the file descriptor of a file which is already opened by some other process?

Or any method to get the File descriptor from the filepath ?

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Programming :: Pyhon - Get The File Descriptor?

Apr 19, 2011

I create two script file name for "a.py" and "b.py", It's through socket connection.
a.py's file writeing "os.pub(s.fileno,x)"create the file descriptor,but i don't know how to get the descriptor file with "b.py"

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Programming :: What Does Closing A File Descriptor Mean

Mar 13, 2011

As we know, every process has a table with a file descriptor table, in which each entry contains a file pointer pointing to the corresponding file table which contains a v-node pointer pointing to the v-node table.

When closing a file descriptor, are all these data structure deleted?

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General :: File Descriptor Redirection And Duplication?

Mar 3, 2010

i've checked the link, and it makes it better. but it doesn't include all the information. i'll continue searching the internet. However i have seen an example of creating a fd:

exec 5<&1
echo "TEST" >&5
exec 5>&-

as in the page, this was intended to redirect the stdout to the fd 5 and create it, and close it. i have the following questions:- what is exactly the meaning of second command? is it to redirect the command stdout "test" to the fd 5? and how i can see the contents of the fd 5? - in the first command, why the < is used instead if > and what is the difference between the below two commands as in the info bash *Redirection section It will be helpful if anyone could include a graph for file descriptor before and after different command execution.


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General :: Command For Short File Descriptor?

Jun 25, 2010

the short file descriptor of an ISO file. I have been assigned with a task to match the short file descriptor of an ISO file(to be provided to the customer) to check if thats "Kudgo Support tools" or not.What linux command should I use?

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General :: Input To Sudo - What Is Its File Descriptor

Aug 5, 2011

Where does input to sudo go? I mean when we give password to sudo prompt where it actually goes? If it goes to a file what is its name or what is its file descriptor?

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Server :: Can Define Max Limit Of File Descriptor

Jul 7, 2009

We are facing problem of to many file open error because of that application become slow and in tomcat catalina log we get following error frequently Jul 6, 2009 12:27:57 PM org.apache.tomcat.util.net.JIoEndpoint$Acceptor run SEVERE: Socket accept failed

at java.net.PlainSocketImpl.socketAccept(Native Method)
at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384)
at java.net.ServerSocket.implAccept(ServerSocket.java:453)


no file limit,file descriptor limit for 300 user of tomcat application server and also oracle database server?

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Software :: Bad Tty & File Descriptor Error While Building RPM On F13

Dec 20, 2010

I have an FC13 x86_64 server and having trouble building RPMs, but I don't think it's specifically an RPM problem. I think it's a tty management or other type of problem.

When spec files have a "%files -f filelist.txt", which contains the list of files for the RPM, it calls the /usr/lib/check-files script, which sorts the files that are supposed to be in the RPM and compares them with the files that are in the built RPM before they are packaged.

The trouble is that the sort fails.

Here's the trace from the check-files script:

The above doesn't show that the output from sort is redirected into those /tmp files. The first sort succeeds because it reads data sent by the "find" in the same shell. The second sort fails because (I think) it cannot read data from stdin for some reason.

What could possibly cause this? I've checked various permissions, libraries, even used strace extensively, all of which is inconclusive.

This is one of my test server boxes, so this problem is something that I've caused, but I have no idea what.

libc controls input and output, correct? Could it somehow be a glibc problem, or a devpts problem? I can run a simple command and pipe it to sort with no problem. It appears to only be related to sub-shells.

I also replaced sort with cat and just tried to redirect stdin in that file to a temporary file, and that also fails.

I've tried running it with selinux disabled and that has no effect.

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Ubuntu Servers :: Maximum Of 1024 File Descriptor Limit?

May 4, 2011

I'm running nginx for static files and as a proxy server for a comet IM server on ubuntu Jaunty. On high load I'm hitting a limit of 1024 file descriptors. I've tried increasing this limit but still can't pass 1024. Does "more /proc/sys/fs/file-nr" gives me the global count of used file descriptors? Why do I see a maximum of 1024 open file descriptors in /proc/sys/fs/file-nr if this is the global count for the machine and each user should have at least 1024 allowed file descriptors by default? Is there a way to increase the limit while the server is running?

Some relevant info on my server:
sudo more /proc/sys/fs/file-nr
sudo sysctl fs.file-max
fs.file-max = 38001
sudo nano /etc/security/limits.conf
* hard nofile 30000
* soft nofile 30000

I also added this to /usr/local/nginx/conf/nginx.conf:
worker_rlimit_nofile 10240;
Uncommented the following line in /etc/pam.d/su:
session required pam_limits.so

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SUSE :: Get File Descriptor From Major And Minor Number?

Nov 15, 2010

Is it possible to get a file descriptor from the major and minor number. If so, how can this be done? I am trying to see if a port(eg ttyS2) is opened without using the fdopen or open or fopen functions. is there a way to get the file descriptor of file or port that as already been opened, without using the functions I mentioned above. These functions reopens the port. I am trying to avoid that.

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Programming :: PyGTK: Send Output From A File Descriptor To A Textview?

Jul 22, 2010

Within PyGTK I'm using gobject.spawn_async to launch a bash script. I would like the output of that bash script to be displayed within my application. I have a textview set up to receive the text ...

Here are the commands that launch the program:

def run_command(command):
global keep_pulsing
(cpid, cstdin, cstdout, cstderr) = gobject.spawn_async(command,flags=gobject.SPAWN_DO_NOT_REAP_CHILD|gobject.SPAWN_STDERR_TO_DEV_NULL,standard_code....

Here are the two callback functions. But like I say ... I have no idea how to get that data from the 'cstdout' file descriptor into a textbuffer.

textview = wTree.get_widget('textview1')
def update_textview_callback(fd, condition):
global keep_pulsing
if keep_pulsing:

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Ubuntu Multimedia :: How To Get Jack Going

May 2, 2010

For starters; although I am comfortable with Ubuntu, I don't really understand these midi and jack things,Ok,so I got a midi controller keyboard which I want to connect to my ubuntu pc to start making some music (play piano and possibly try to make some songs). I don't know if my sound card supports midi, but I got a Roland midi-to-usb converter. I connected it to my pc and downloaded Jack Control. When I fire up Jack control my normal music (using audacious) stops (don't know if this is normal). On the window that appears I hit start which results in an error, which I will paste below:

22:46:06.556 Patchbay deactivated.
22:46:06.560 Statistics reset.


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Ubuntu Multimedia :: Using ESI Gigaport With Jack / 9.04?

May 6, 2010

I have an ESI Gigaport HD USB external soundcard which I'd like to use via Jack with my Thinkpad T40 running Ubuntu 9.04.This is the card, it has no inputs and 8 x outputs:


The card is autodetected on plug in. I can see the 8 x outputs in the Jack connection window but I can't run any sound to it. Anything I connect to it on any of the 8 channels is silent.

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Ubuntu Multimedia :: JACK Not Working 10.4?

Aug 30, 2010

I had Ubuntu 10.4 installed and JACK was working excellent. I noticed that gnome was a little more than what I needed so I installed the xubuntu-desktop package. After that install JACK no longer works... I run the command jackd -d alsa and I get a bus error. I did a new install from an xubuntu iso and same error.

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Ubuntu Multimedia :: JACK Isn't Working?

Dec 1, 2010

Same as above. I've fiddled around, but I can't get Rosebud to work. I have Qsynth, ZynAddSubFX Synth, JACK control, and Rosebud but I can't get any of it to work

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Ubuntu Multimedia :: Can't Get Jack To Work

Jan 26, 2011

Can't get jack to work. Installed from synaptic (running ubuntu 10.10, 64bit).

WHen ckicking "start" in qjackctl (jack control) I keep getting this message:

19:27:58.615 Patchbay deactivated.
19:27:58.616 Statistics reset.
Cannot connect to server socket err = No such file or directory
Cannot connect to server socket
jack server is not running or cannot be started


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Ubuntu Multimedia :: No Sound Through Headphone Jack?

Feb 18, 2010

I just realize that when I plug in my headphones in my laptop, the sound in the laptop's speakers continues to play and I have no sound on the headphones. This is the output of the 'sudo lshw -C sound' on my system:

*-multimedia UNCLAIMED
description: Audio device
product: nVidia Corporation
vendor: nVidia Corporation
physical id: 0.1
bus info: pci@0000:01:00.1
version: a1
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: latency=0
resources: memory:d3000000-d3003fff .....

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Ubuntu Multimedia :: PulseAudio Over JACK In Lucid?

May 2, 2010

Why do this? Two reasons:

1) Many of us use JACK for low-latency audio work, but it's annoying to have to turn it on or off to have to allow regular Ubuntu applications to work. It's even more annoying that both can't normally work together -- either JACK or PulseAudio must take control of the sound control. This method allow JACK to do, and PulseAudio just routes to JACK.

2) JACK is kinda super awesome. By routing PulseAudio through it, your regular Ubuntu sound application suddenly get super powers. Pretty easy to do! (Well, we count our blessings in Linux...)

1. DYNAMICALLY You need the PulseAudio utilities and JACK sink:

sudo aptitude install pulseaudio-utils pulseaudio-module-jack And then run this to get PulseAudio connected to JACK: Code:pactl load-module module-jack-sink pactl load-module module-jack-source Now, go to Ubuntu's sound preferences, and you'll see "Jack sink" in the output tab. If you use JACK Control, you can create a script for the above and have it set up in "Execute script after Startup". Then, PulseAudio will automatically load the JACK sink when you start JACK.

2. BY DEFAULT Edit /etc/pulse/default.pa, and add these lines:

Code:load-module module-jack-source load-module module-jack-sink You can test it without rebooting by restarting PulseAudio. In Ubuntu, PulseAudio is started in the user session, not as a system daemon. To restart it:

pulseaudio --kill
pulseaudio --start

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Ubuntu Multimedia :: No Sound From Headphone Jack

May 9, 2010

I can not get sound to exit from my headphone jack, whenever I plug it in, no sounds come out. Notebook model is Acer 3820TG. By the way, I've tried adding the line for HDA Intel with udo gedit /etc/modprobe.d/alsa-base.conf


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Ubuntu Multimedia :: JACK SERVER - Unable To Run

Jun 25, 2010

JACK will not run ( eg. the server just won't go! ) When running Rosegarden I can not access the Qsynth/Fluidsynth.In the Rosegarden "manage MIDI devices" menu it now shows ONLY one "General Midi Device" -thats all, and I do not know where to/how to get access to qsynth/fluidsynth to use soundfontsIn manage midi devices I ONLY get the option of "general midi"and then its only through "14:0 Midi through port 0 (duplex)" and no
other channels are available or offered!If I import one of the devices that come with rosegarden ( like Aleisis ) there is no sound.

Also if anyone knows: (& if I can fix the above) how do I set Rosegarden to use a software synth like ZynAddSubFX on the track/channel? External softsynths do not show up, so how do I assign the channel to use them>

Ps: Rosegarden did not install with the help files, even a complete removal and reinstall does not fix this- hats why I may be asking questions which could possibly be in the Rosegarden manual ( but NOT anywhere online that I've found in 3 days of searching- and I'm a research assistant for cognitive sciences- eg: good at researching! )

Here's the JACK output:

First the error:

-Overall operation failed
-Unable to connect to server

Heres the message window output:

p, li { white-space: pre-wrap; } 10:39:56.296 Patchbay deactivated.
10:39:56.478 Statistics reset.
10:39:56.549 Startup script...
10:39:56.549 artsshell -q terminate


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Ubuntu Multimedia :: No Sound From Headphones Jack 10.4 / Get That?

Jul 27, 2010

I have a little issue.

I have netbook Asus EEE PC 1001PX (he's got only one jack for headphone and mic, i dont' know how this could work... but anyway)

I have no sound from headphone, from speakers is ok.

I've already edit /etc/modprobe.d/alsa-base.conf and insert the options snd-hda-intel model=asus at the bottom, still nothing.

I've try also to uninstal linux-backports-wireless... and still nothing.

Card: Intel HDA.

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Ubuntu Multimedia :: Jack Runs But No Sound?

Sep 4, 2010

Jack runs, but I can't get sound to play through it. Another thing that happens is when I launch jack, all audio in the system, whether its connected to jack or not, goes off. There are no errors or anything in the messages window. And I checked to see if it was connected to the correct interface. I have a mac mini and I run ppc lucid lynx. The system does detect my hardware, and its not muted. All I want to do is use MusE. Is there maybe anyway to run MusE without jack?

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Ubuntu Multimedia :: Redirecting ALSA Over JACK 10.4 - 3

Sep 9, 2010

I finally ditched PulseAudio and set up my system with a realtime kernel. I'm redirecting ALSA over JACK. The good: - Awesome, I can get <5ms latency without any xruns! (although 23.2 msec as described below is just fine for me) The bad: - I'm a long-time linux audio user, but have got some minor issues which spoil the fun.

1. Without pulseaudio, the indicator applet refuses to show a volume control applet. The old gnome-volume-control-applet (the one with tooltip!) loads but doesn't show in the gnome-panel. Although I can set the volume with envy24control, it's not quite as practical as using the scrollwheel! Any way to fix this?

2. When I launching any application (such as a terminal) from the gnome-panel, a new JACK connection is created, but not cleaned up after closing the application. As a result, the QJackCtl connection list is flooded with alsa-jack.jackP.8528.xx connections (where 8528 is the process ID of gnome-panel). The jack_lsp command line program shows the same (added spaces after every : to get around the smiley filter):


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Ubuntu Multimedia :: NO SOUND After JACK Install?

Sep 28, 2010

I am trying to set my computer up to do sound sequencing. I want to plug my MIDI keyboard in and record with a sequencer. Running 10.04, was following a tutorial on installing JACK, and my audio stopped working. Since then, I've gone through all guides I can find, some advising an upgrade of ALSA, some saying to use OCC. I've tried both, but nothing seems to work.

I suspect it may have something to do with libjack0. I could not install jackd because it claimed libjack0 to be the wrong version, and for some reason I couldn't upgrade. So I uninstalled libjack0, then installed jackd, which automatically included the version of libjack0 it wanted. After that, I could get the JACK server running, but the computer had no sound.

I will post whatever logs or information necessary to troubleshoot, but I don't know exactly how or what to post. If you need logs, please tell me how to get them.

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