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  • Ubuntu error: no candidate ver

    - by codedude
    Ok...so for some reason by Ubuntu 10.04 partition won't startup anymore. I'm not exactly sure what I did. I have the feeling that I accidentally removed some important packages. However, when I startup in Recovery Mode and select "dpkg: repair broken packages" I get this output: rm: cannot remove /var/lib/apt/lists/partial/*': No such file or directory rm: cannot remove/var/cache/apt/archives/partial/*': No such file or directory Reading Cache Reading Package lists: Done Reading State Information: Done Reading State Information: Done Reading State Information: Done No candidate ver: libisc44 No candidate ver: readahead No candidate ver: libdirectfb-1.0-0 No candidate ver: upstart-logd No candidate ver: libparted1.8-10 No candidate ver: libflickrnet2.1.5-cil No candidate ver: libicu38 No candidate ver: fast-user-switch-applet No candidate ver: linux-restricted-modules-2.6.28-11-generic No candidate ver: libnm-util0 No candidate ver: libwebkit-1.0-1 No candidate ver: libopal3.6.1 No candidate ver: libbind9-40 No candidate ver: linux-restricted-modules-common No candidate ver: upstart-compat-sysv No candidate ver: linux-restricted-modules-2.6.28-13-generic No candidate ver: chromium-browser No candidate ver: libisc45 No candidate ver: belocs-locales-bin No candidate ver: libxcb-xlib0 No candidate ver: libpoppler4 No candidate ver: libpulsecore9 No candidate ver: libpulsecore5 No candidate ver: linux-image-2.6.28-15-generic No candidate ver: libntfs-3g49 No candidate ver: libisccfg40 No candidate ver: libavahi-core5 No candidate ver: linux-restricted-modules-2.6.27-7-generic No candidate ver: libparted1.8-9 No candidate ver: libmagickwand1 No candidate ver: libwvstreams4.4-base No candidate ver: linux-image-2.6.28-14-generic No candidate ver: libraw1394-8 No candidate ver: libdatrie0 No candidate ver: libboost-program-options1.35.0 No candidate ver: libgnomekbdui3 No candidate ver: libsgutils1 No candidate ver: libass1 No candidate ver: linux-restricted-modules-2.6.28-15-generic No candidate ver: libindicate1 No candidate ver: libgnomekbd3 No candidate ver: system-services No candidate ver: linux-image-2.6.28-13-generic No candidate ver: libmagick10 No candidate ver: libcolamd-3.2.0 No candidate ver: desktop-effects-kde No candidate ver: picasa No candidate ver: libgnome-desktop-2-7 No candidate ver: libntfs-3g28 No candidate ver: libxklavier12 No candidate ver: libgpod3 No candidate ver: libmagickcore1 No candidate ver: libffado0 No candidate ver: libzephyr3 No candidate ver: libuniconf4.4 No candidate ver: libmbca0 No candidate ver: liblwres40 No candidate ver: hotkey-setup No candidate ver: libkrb53 No candidate ver: ttf-bitstream-vera No candidate ver: libee12-2 No candidate ver: libopal-2.2 No candidate ver: songbird No candidate ver: plib1.8.4c2 No candidate ver: linux-image-2.6.27-7-generic No candidate ver: libpoppler3 No candidate ver: google-chrome-unstable No candidate ver: linux-image-2.6.28-11-generic No candidate ver: linux-restricted-modules-2.6.28-14-generic No candidate ver: simgear1.0.0 No candidate ver: libpoppler-glib3 No candidate ver: mono-common No candidate ver: libx264-65 No candidate ver: libwvstreams4.4-extras No candidate ver: libdns43 No candidate ver: libnm-glib0 No candidate ver: libpt2.6.1 No candidate ver: libisccc40 No candidate ver: libdns45 No candidate ver: libisc44 No candidate ver: readahead No candidate ver: libdirectfb-1.0-0 No candidate ver: upstart-logd No candidate ver: libparted1.8-10 No candidate ver: libflickrnet2.1.5-cil No candidate ver: libicu38 No candidate ver: fast-user-switch-applet No candidate ver: linux-restricted-modules-2.6.28-11-generic No candidate ver: libnm-util0 No candidate ver: libwebkit-1.0-1 No candidate ver: libopal3.6.1 No candidate ver: libbind9-40 No candidate ver: linux-restricted-modules-common No candidate ver: upstart-compat-sysv No candidate ver: linux-restricted-modules-2.6.28-13-generic No candidate ver: chromium-browser No candidate ver: libisc45 No candidate ver: belocs-locales-bin No candidate ver: libxcb-xlib0 No candidate ver: libpoppler4 No candidate ver: libpulsecore9 No candidate ver: lipulsecore5 No candidate ver: linux-image-2.6.28-15-generic No candidate ver: libntfs-3g49 No candidate ver: libisccfg40 No candidate ver: libavahi-core5 No candidate ver: linux-restricted-modules-2.6.27-7-generic No candidate ver: libparted1.8-9 No candidate ver: libmagickwand1 No candidate ver: linux-image-2.6.28-14-generic No candidate ver: libraw1394-8 No candidate ver: libdatrie0 No candidate ver: libboost-program-options1.35.0 No candidate ver: libgnomekbdui3 No candidate ver: libsgutils1 No candidate ver: libass1 No candidate ver: linux-restricted-modules-2.6.28-15-generic No candidate ver: libindicate1 No candidate ver: libgnomekbd3 No candidate ver: system-services No candidate ver: linux-image-2.6.28-13-generic No candidate ver: libmagick10 No candidate ver: libcolamd-3.2.0 No candidate ver: desktop-effects-kde No candidate ver: picasa No candidate ver: libgnome-desktop-2-7 No candidate ver: libntfs-3g28 No candidate ver: libxklavier12 No candidate ver: libgpod3 No candidate ver: libmagickcore1 No candidate ver: libffado0 No candidate ver: libzephyr3 No candidate ver: libuniconf4.4 No candidate ver: libmbca0 No candidate ver: liblwres40 No candidate ver: hotkey-setup No candidate ver: libkrb53 No candidate ver: ttf-bitstream-vera No candidate ver: libeel2-2 No candidate ver: libopal-2.2 No candidate ver: songbird No candidate ver: plib1.8.4c2 No candidate ver: linux-image-2.6.27-7-generic No candidate ver: libpoppler3 No candidate ver: google-chrome-unstable No candidate ver: linux-image-2.6.28-11-generic No candidate ver: linux-restricted-modules-2.6.28-14-generic No candidate ver: simgear1.0.0 No candidate ver: libpoppler-glib3 No candidate ver: mono-common No candidate ver: libx264-65 No candidate ver: libwvstreams4.4-extras No candidate ver: libdns43 No candidate ver: libnm-glib0 No candidate ver: libpt2.6.1 No candidate ver: libisccc40 No candidate ver: libdns45 Your system is up-to-date There are no upgrades available for your system. The upgrade will now be canceled. Do you want to start the upgrdae? Continue [yN] Details [d] (Sorry that is so long...) I'm assuming I'm missing each of those packages. However, when I try to install them, for example: sudo apt-get install libisc44 I get some response that this package is missing and/or it may be part of another package. I'm not exactly sure what I should do. I don't want to reinstall ubuntu, since I have it dual booted with Windows Vista and I don't want to risk anything on the Windows partition. What are your thoughts? EDIT: I've posted this on Ubuntu Forums and nobody ever responded so...yah

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  • Ubuntu error: no candidate ver

    - by codedude
    Ok...so for some reason by Ubuntu 10.04 partition won't startup anymore. I'm not exactly sure what I did. I have the feeling that I accidentally removed some important packages. However, when I startup in Recovery Mode and select "dpkg: repair broken packages" I get this output: rm: cannot remove /var/lib/apt/lists/partial/*': No such file or directory rm: cannot remove/var/cache/apt/archives/partial/*': No such file or directory Reading Cache Reading Package lists: Done Reading State Information: Done Reading State Information: Done Reading State Information: Done No candidate ver: libisc44 No candidate ver: readahead No candidate ver: libdirectfb-1.0-0 No candidate ver: upstart-logd No candidate ver: libparted1.8-10 No candidate ver: libflickrnet2.1.5-cil No candidate ver: libicu38 No candidate ver: fast-user-switch-applet No candidate ver: linux-restricted-modules-2.6.28-11-generic No candidate ver: libnm-util0 No candidate ver: libwebkit-1.0-1 No candidate ver: libopal3.6.1 No candidate ver: libbind9-40 No candidate ver: linux-restricted-modules-common No candidate ver: upstart-compat-sysv No candidate ver: linux-restricted-modules-2.6.28-13-generic No candidate ver: chromium-browser No candidate ver: libisc45 No candidate ver: belocs-locales-bin No candidate ver: libxcb-xlib0 No candidate ver: libpoppler4 No candidate ver: libpulsecore9 No candidate ver: libpulsecore5 No candidate ver: linux-image-2.6.28-15-generic No candidate ver: libntfs-3g49 No candidate ver: libisccfg40 No candidate ver: libavahi-core5 No candidate ver: linux-restricted-modules-2.6.27-7-generic No candidate ver: libparted1.8-9 No candidate ver: libmagickwand1 No candidate ver: libwvstreams4.4-base No candidate ver: linux-image-2.6.28-14-generic No candidate ver: libraw1394-8 No candidate ver: libdatrie0 No candidate ver: libboost-program-options1.35.0 No candidate ver: libgnomekbdui3 No candidate ver: libsgutils1 No candidate ver: libass1 No candidate ver: linux-restricted-modules-2.6.28-15-generic No candidate ver: libindicate1 No candidate ver: libgnomekbd3 No candidate ver: system-services No candidate ver: linux-image-2.6.28-13-generic No candidate ver: libmagick10 No candidate ver: libcolamd-3.2.0 No candidate ver: desktop-effects-kde No candidate ver: picasa No candidate ver: libgnome-desktop-2-7 No candidate ver: libntfs-3g28 No candidate ver: libxklavier12 No candidate ver: libgpod3 No candidate ver: libmagickcore1 No candidate ver: libffado0 No candidate ver: libzephyr3 No candidate ver: libuniconf4.4 No candidate ver: libmbca0 No candidate ver: liblwres40 No candidate ver: hotkey-setup No candidate ver: libkrb53 No candidate ver: ttf-bitstream-vera No candidate ver: libee12-2 No candidate ver: libopal-2.2 No candidate ver: songbird No candidate ver: plib1.8.4c2 No candidate ver: linux-image-2.6.27-7-generic No candidate ver: libpoppler3 No candidate ver: google-chrome-unstable No candidate ver: linux-image-2.6.28-11-generic No candidate ver: linux-restricted-modules-2.6.28-14-generic No candidate ver: simgear1.0.0 No candidate ver: libpoppler-glib3 No candidate ver: mono-common No candidate ver: libx264-65 No candidate ver: libwvstreams4.4-extras No candidate ver: libdns43 No candidate ver: libnm-glib0 No candidate ver: libpt2.6.1 No candidate ver: libisccc40 No candidate ver: libdns45 No candidate ver: libisc44 No candidate ver: readahead No candidate ver: libdirectfb-1.0-0 No candidate ver: upstart-logd No candidate ver: libparted1.8-10 No candidate ver: libflickrnet2.1.5-cil No candidate ver: libicu38 No candidate ver: fast-user-switch-applet No candidate ver: linux-restricted-modules-2.6.28-11-generic No candidate ver: libnm-util0 No candidate ver: libwebkit-1.0-1 No candidate ver: libopal3.6.1 No candidate ver: libbind9-40 No candidate ver: linux-restricted-modules-common No candidate ver: upstart-compat-sysv No candidate ver: linux-restricted-modules-2.6.28-13-generic No candidate ver: chromium-browser No candidate ver: libisc45 No candidate ver: belocs-locales-bin No candidate ver: libxcb-xlib0 No candidate ver: libpoppler4 No candidate ver: libpulsecore9 No candidate ver: lipulsecore5 No candidate ver: linux-image-2.6.28-15-generic No candidate ver: libntfs-3g49 No candidate ver: libisccfg40 No candidate ver: libavahi-core5 No candidate ver: linux-restricted-modules-2.6.27-7-generic No candidate ver: libparted1.8-9 No candidate ver: libmagickwand1 No candidate ver: linux-image-2.6.28-14-generic No candidate ver: libraw1394-8 No candidate ver: libdatrie0 No candidate ver: libboost-program-options1.35.0 No candidate ver: libgnomekbdui3 No candidate ver: libsgutils1 No candidate ver: libass1 No candidate ver: linux-restricted-modules-2.6.28-15-generic No candidate ver: libindicate1 No candidate ver: libgnomekbd3 No candidate ver: system-services No candidate ver: linux-image-2.6.28-13-generic No candidate ver: libmagick10 No candidate ver: libcolamd-3.2.0 No candidate ver: desktop-effects-kde No candidate ver: picasa No candidate ver: libgnome-desktop-2-7 No candidate ver: libntfs-3g28 No candidate ver: libxklavier12 No candidate ver: libgpod3 No candidate ver: libmagickcore1 No candidate ver: libffado0 No candidate ver: libzephyr3 No candidate ver: libuniconf4.4 No candidate ver: libmbca0 No candidate ver: liblwres40 No candidate ver: hotkey-setup No candidate ver: libkrb53 No candidate ver: ttf-bitstream-vera No candidate ver: libeel2-2 No candidate ver: libopal-2.2 No candidate ver: songbird No candidate ver: plib1.8.4c2 No candidate ver: linux-image-2.6.27-7-generic No candidate ver: libpoppler3 No candidate ver: google-chrome-unstable No candidate ver: linux-image-2.6.28-11-generic No candidate ver: linux-restricted-modules-2.6.28-14-generic No candidate ver: simgear1.0.0 No candidate ver: libpoppler-glib3 No candidate ver: mono-common No candidate ver: libx264-65 No candidate ver: libwvstreams4.4-extras No candidate ver: libdns43 No candidate ver: libnm-glib0 No candidate ver: libpt2.6.1 No candidate ver: libisccc40 No candidate ver: libdns45 Your system is up-to-date There are no upgrades available for your system. The upgrade will now be canceled. Do you want to start the upgrdae? Continue [yN] Details [d] (Sorry that is so long...) I'm assuming I'm missing each of those packages. However, when I try to install them, for example: sudo apt-get install libisc44 I get some response that this package is missing and/or it may be part of another package. I'm not exactly sure what I should do. I don't want to reinstall ubuntu, since I have it dual booted with Windows Vista and I don't want to risk anything on the Windows partition. What are your thoughts? EDIT: I've posted this on Ubuntu Forums and nobody ever responded so...yah

    Read the article

  • Using Xlib via JNA to move a window

    - by rob
    I'm using JNA to manipulate application windows on Linux by sending Xlib messages but can't seem to move a window. My original implementation executed wmctrl on the shell to move the windows and that successfully moved the windows. Unfortunately, there's a noticeable amount of overhead associated with calling shell programs from Java, so now I'm trying to make direct API calls using JNA. I'm using the X11 example available from the JNA website and can successfully do a few tricks, such as enumerating the window IDs and reading window properties, so I know JNA+Xlib is at least partially working. First I tried moving the windows directly using XMoveWindow() but the window manager was apparently blocking those calls. I ran across a thread that suggested I needed to send a client message using XSendMessage(), so I've done that below, but apparently XSendMessage() is failing because the window doesn't move and I get a return value of 0. I'm guessing I omitted something obvious, but can't quite figure it out. Any suggestions? Note that, for the purposes of this example, the main method has a window ID hard-coded. This is the window ID of the window I'm trying to move (obtained using wmctrl -l on the console). import com.sun.jna.NativeLong; import com.sun.jna.Pointer; import com.sun.jna.examples.unix.X11; import com.sun.jna.examples.unix.X11.Atom; import com.sun.jna.examples.unix.X11.AtomByReference; import com.sun.jna.examples.unix.X11.Display; import com.sun.jna.examples.unix.X11.Window; import com.sun.jna.examples.unix.X11.WindowByReference; import com.sun.jna.examples.unix.X11.XEvent; import com.sun.jna.examples.unix.X11.XTextProperty; import com.sun.jna.examples.unix.X11.XWindowAttributes; import com.sun.jna.ptr.IntByReference; import com.sun.jna.ptr.NativeLongByReference; import com.sun.jna.ptr.PointerByReference; private static final int FALSE = 0; /** C-style boolean "false" */ private static final int TRUE = 1; /** C-style boolean "true" */ public static void main(String[] args) { setWindowPos(new Window(0x01300007), 100, 100, 600, 400); // update the Window constructor with the appropriate ID given by wmctrl -l } public static boolean setWindowPos(Window window, int x, int y, int w, int h) { final X11 x11 = X11.INSTANCE; Display display = x11.XOpenDisplay(null); NativeLong mask = new NativeLong(X11.SubstructureRedirectMask | X11.SubstructureNotifyMask | X11.ResizeRedirectMask); XEvent event = new XEvent(); String msg = "_NET_MOVERESIZE_WINDOW"; //$NON-NLS-1$ long grflags = 0l; // use the default gravity of the window if (x != -1) grflags |= (1 << 8); if (y != -1) grflags |= (1 << 9); if (w != -1) grflags |= (1 << 10); if (h != -1) grflags |= (1 << 11); event.xclient.type = X11.ClientMessage; event.xclient.serial = new NativeLong(0l); event.xclient.send_event = TRUE; event.xclient.message_type = x11.XInternAtom(display, msg, false); event.xclient.window = window; event.xclient.format = 32; event.xclient.data.l[0] = new NativeLong(grflags); // gravity flags event.xclient.data.l[1] = new NativeLong(x); event.xclient.data.l[2] = new NativeLong(y); event.xclient.data.l[3] = new NativeLong(w); event.xclient.data.l[4] = new NativeLong(h); int status = x11.XSendEvent(display, x11.XDefaultRootWindow(display), FALSE, mask, event); x11.XFlush(display); // need to XFlush if we're not reading X events if (status == 0) { // 0 indicates XSendEvent failed logger.error("setWindowPos: XSendEvent failed (" + msg + ")"); //$NON-NLS-1$ return false; } return true; }

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  • "type" Command Not Working As Expected on Git Bash

    - by trysis
    The type command, in Linux, returns the location, on the filesystem, of the given file, if it is in the current folder or the $PATH. This functionality is also available through Windows with the Git Bash command line program. The command also returns a file's location given the file without its extension (.exe, .vbs, etc.) However, I have run into what seems like a strange corner case where the file exists on the $PATH but doesn't get returned using the command. I am thinking of buying a new computer soon, so I looked up the method of transferring the license key from one computer to another, in preparation for actually doing this. The method I found mentioned the files slmgr.vbs and slui.exe, both of which reside in the C:/Windows\System32 folder, which is in my $PATH, as usual for a Windows computer. However, these two files aren't showing up when I use the type command. Also, neither gets executed when I call the files as commands without their extensions in Git Bash, and only slmgr.vbs gets executed when I call them with the extensions. Finally, slmgr.vbs is shown when listing the folder's contents in Git Bash, as well, but slui.exe isn't. I thought this might have to do with permissions, and, indeed, both files have very restrictive permissions, as you can see in the pictures below, but they both have the same permissions, which wouldn't explain why one gets executed and the other doesn't when called directly, nor why one file is listed on command line but the other isn't. C:\Windows\System32 folder, proving the files exist: File permissions for the Users and Administrators groups for the two files (they are identical): And the folder: type command and its output in Git Bash for the 2 files, plus listing the files in the folder (using grep to filter as the folder is huge), as well as listing part of the $PATH (keep in mind, for all these, that Git Bash changes the paths as they are displayed): Sean@MYPC ~ $ type -a slmgr sh.exe": type: slmgr: not found Sean@MYPC ~ $ type -a slmgr.vbs sh.exe": type: slmgr.vbs: not found Sean@MYPC ~ $ type -a slui sh.exe": type: slui: not found Sean@MYPC ~ $ type -a slui.exe sh.exe": type: slui.exe: not found Sean@MYPC ~ $ slmgr sh.exe": slmgr: command not found Sean@MYPC ~ $ slmgr.vbs /c/WINDOWS/system32/slmgr.vbs: line 2: syntax error near unexpected token `(' /c/WINDOWS/system32/slmgr.vbs: line 2: `' Copyright (c) Microsoft Corporation. A ll rights reserved.' Sean@MYPC ~ $ slui sh.exe": slui: command not found Sean@MYPC ~ $ slui.exe sh.exe": slui.exe: command not found Sean@MYPC ~ $ ls /c/Windows/System32/slui.exe /c/Windows/System32/slmgr.vbs ls: /c/Windows/System32/slui.exe: No such file or directory /c/Windows/System32/slmgr.vbs Sean@MYPC ~ $ echo $PATH /c/Users/Sean/bin:.:/usr/local/bin:/mingw/bin:/bin:/cmd:/c/Python33/:/c/Program Files (x86)/Intel/iCLS Client/:/c/Program Files/Intel/iCLS Client/:/c/WINDOWS/sy stem32:/c/WINDOWS:/c/WINDOWS/System32/Wbem:/c/WINDOWS/System32/WindowsPowerShell /v1.0/:/c/Program Files/Intel/Intel(R) Management Engine Components/DAL:/c/Progr am Files/Intel/Intel(R) Management Engine Components/IPT:/c/Program Files (x86)/ Intel/Intel(R) Management Engine Components/DAL:/c/Program Files (x86)/Intel/Int el(R) Management Engine Components/IPT:/c/Program Files/Intel/WiFi/bin/:/c/Progr am Files/Common Files/Intel/WirelessCommon/:/c/strawberry/c/bin:/c/strawberry/pe rl/site/bin:/c/strawberry/perl/bin:/c/Program Files (x86)/Microsoft ASP.NET/ASP. NET Web Pages/v1.0/:/c/Program Files/Microsoft SQL Server/110/Tools/Binn/:/c/Pro gram Files (x86)/Microsoft SQL Server/90/Tools/binn/:/c/Program Files (x86)/Open AFS/Common:/c/HashiCorp/Vagrant/bin:/c/Program Files (x86)/Windows Kits/8.1/Wind ows Performance Toolkit/:/c/Program Files/nodejs/:/c/Program Files (x86)/Git/cmd :/c/Program Files (x86)/Git/bin:/c/Program Files/Microsoft/Web Platform Installe r/:/c/Ruby200-x64/bin:/c/Users/Sean/AppData/Local/Box/Box Edit/:/c/Program Files (x86)/SSH Communications Security/SSH Secure Shell:/c/Users/Sean/Documents/Lisp :/c/Program Files/GCL-2.6.1/lib/gcl-2.6.1/unixport:/c/Chocolatey/bin:/c/Users/Se an/AppData/Roaming/npm:/c/wamp/bin/mysql/mysql5.6.12/bin:/c/Program Files/Oracle /VirtualBox:/c/Program Files/Java/jdk1.7.0_51/bin:/c/Program Files/Node-Growl:/c /chocolatey/bin:/c/Program Files/eclipse:/c/MongoDB/bin:/c/Program Files/7-Zip:/ c/Program Files (x86)/Google/Chrome/Application:/c/Program Files (x86)/LibreOffi ce 4/program:/c/Program Files (x86)/OpenOffice 4/program What's happening? Why aren't these files listed with the type command? Is this issue because of weird Windows permissions, or something even weirder? If permissions, why do they seem to have the same permissions, yet both are not handled in the same way?

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  • How to use pipes for nonblocking IPC (UART emulation)

    - by codebauer
    I would like to write some test/emulation code that emulates a serial port connection. The real code looks like this: DUT <- UART - testtool.exe My plan is to use create a test application (CodeUnderTest.out) on linux that forks to launch testool.out with two (read & write) named pipes as arguments. But I cannot figure out how to make all the pipe IO non-blocking! The setup would look like this:. CodeUnderTest.out <- named pipes - testTool.out (lauched from CodeUnderTest.out) I have tried opening the pipes as following: open(wpipe,O_WRONLY|O_NONBLOCK); open(rpipe,O_RDONLY|O_NONBLOCK); But the write blocks until the reader opens the wpipe. Next I tried the following: open(wpipe,O_RDWR|O_NONBLOCK); open(rpipe,O_RDONLY|O_NONBLOCK); But then the reader of the first message never gets any data (doesn't block though) I also tried adding open and close calls around each message, but that didn't work either... Here is some test code: #include <stdio.h> #include <sys/types.h> #include <unistd.h> #include <fcntl.h> pid_t pid; char* rpipe, *wpipe,*x; FILE *rh,*wh; int rfd,wfd; void openrpipe( void ) { rfd = open(rpipe,O_RDONLY|O_NONBLOCK); rh = fdopen(rfd,"rb"); printf("%sopeningr %x\n",x,rh); } void openwpipe( void ) { //Fails when reader not already opened //wfd = open(wpipe,O_WRONLY|O_NONBLOCK); wfd = open(wpipe,O_RDWR|O_NONBLOCK); wh = fdopen(wfd,"wb"); printf("%sopeningw %x\n",x,wh); } void closerpipe( void ) { int i; i = fclose(rh); printf("%sclosingr %d\n",x,i); } void closewpipe( void ) { int i; i = fclose(wh); printf("%sclosingw %d\n",x,i); } void readpipe( char* expect, int len) { char buf[1024]; int i=0; printf("%sreading\n",x); while(i==0) { //printf("."); i = fread(buf,1,len,rh); } printf("%sread (%d) %s\n",x,i,buf); } void writepipe( char* data, int len) { int i,j; printf("%swriting\n",x); i = fwrite(data,1,len,rh); j = fflush(rh); //No help! printf("%sflush %d\n",x,j); printf("%swrite (%d) %s\n",x,i,data); } int main(int argc, char **argv) { rpipe = "readfifo"; wpipe = "writefifo"; x = ""; pid = fork(); if( pid == 0) { wpipe = "readfifo"; rpipe = "writefifo"; x = " "; openrpipe(); openwpipe(); writepipe("paul",4); readpipe("was",3); writepipe("here",4); closerpipe(); closewpipe(); exit(0); } openrpipe(); openwpipe(); readpipe("paul",4); writepipe("was",3); readpipe("here",4); closerpipe(); closewpipe(); return( -1 ); } BTW: To use the testocd above you need to pipes in the cwd: mkfifo ./readfifo mkfifo ./writefifo

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  • mysql_close doesn't kill locked sql requests

    - by Nikita
    I use mysqld Ver 5.1.37-2-log for debian-linux-gnu I perform mysql calls from c++ code with functions mysql_query. The problem occurs when mysql_query execute procedure, procedure locked on locked table, so mysql_query hangs. If send kill signal to application then we can see lock until table is locked. Create the following SQL table and procedure CREATE TABLE IF NOT EXISTS `tabletolock` ( `id` INT NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`) )ENGINE = InnoDB; DELIMITER $$ DROP PROCEDURE IF EXISTS `LOCK_PROCEDURE` $$ CREATE PROCEDURE `LOCK_PROCEDURE`() BEGIN SELECT id INTO @id FROM tabletolock; END $$ DELOMITER; There are sql commands to reproduce the problem: 1. in one terminal execute lock tables tabletolock write; 2. in another terminal execute call LOCK_PROCEDURE(); 3. In first terminal exeute show processlist and see | 2492 | root | localhost | syn_db | Query | 12 | Locked | SELECT id INTO @id FROM tabletolock | Then perfrom Ctrl-C in second terminal to interrupt our procudere and see processlist again. It is not changed, we already see locked select request and can teminate it by unlock tables or kill commands. Problem described is occured with mysql command line client. Also such problem exists when we use functions mysql_query and mysql_close. Example of c code: #include <iostream> #include <mysql/mysql.h> #include <mysql/errmsg.h> #include <signal.h> // g++ -Wall -g -fPIC -lmysqlclient dbtest.cpp using namespace std; MYSQL * connection = NULL; void closeconnection() { if(connection != NULL) { cout << "close connection !\n"; mysql_close(connection); mysql_thread_end(); delete connection; mysql_library_end(); } } void sigkill(int s) { closeconnection(); signal(SIGINT, NULL); raise(s); } int main(int argc, char ** argv) { signal(SIGINT, sigkill); connection = new MYSQL; mysql_init(connection); mysql_options(connection, MYSQL_READ_DEFAULT_GROUP, "nnfc"); if (!mysql_real_connect(connection, "127.0.0.1", "user", "password", "db", 3306, NULL, CLIENT_MULTI_RESULTS)) { delete connection; cout << "cannot connect\n"; return -1; } cout << "before procedure call\n"; mysql_query(connection, "CALL LOCK_PROCEDURE();"); cout << "after procedure call\n"; closeconnection(); return 0; } Compile it, and perform the folloing actions: 1. in first terminal local tables tabletolock write; 2. run program ./a.out 3. interrupt program Ctrl-C. on the screen we see that closeconnection function is called, so connection is closed. 4. in first terminal execute show processlist and see that procedure was not intrrupted. My question is how to terminate such locked calls from c code? Thank you in advance!

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  • How do I detect a file write error in C?

    - by rich
    I have an embedded environment where a user might insert or remove a USB flash drive. I would like to know if the drive has been removed, or if there is some other problem when I try to write to the drive. However, Linux just saves the information in its buffers and returns with no indicated error. The computer I'm using comes with a 2.4.26 kernel and libc 2.3.2. I'm mounting the drive this way: i = mount(MEMORY_DEV_PATH, MEMORY_MNT_PATH, "vfat", MS_SYNCHRONOUS, NULL); That works: 50:/root # mount /dev/scsi/host0/bus0/target0/lun0/part1 on /mem type vfat (rw,sync) 50:/root # Later, I try to copy a file to it: int ifile, ofile; ifile = open("/tmp/tmpmidi.mid", O_RDONLY); if (ifile < 0) { perror("open in"); break; } ofile = open(current_file_name.c_str(), O_WRONLY | O_SYNC); if (ofile < 0) { perror("open out"); break; } #define BUFSZ 256 char buffer[BUFSZ]; while (1) { i = read(ifile, buffer, BUFSZ); if (i < 0) { perror("read"); break; } j = write(ofile, buffer, i); if (j < 0) { perror("write"); break; } if (i != j) { perror("Sizes wrong"); break; } if (i < BUFSZ) { printf("Copy is finished, I hope\n"); close(ifile); close(ofile); break; } } If this snippet of code is executed with a write-protected USB memory, the result is Copy is finished, I hope amid a flurry of error messages from the kernel on the console. I believe the same thing would happen if I simply removed the USB drive (without unmounting it). I have also fiddled with devfs. I figured out how to get it to automatically mount the drive, (with the REGISTER event) but it never seems to trigger the UNREGISTER when I pull out the memory. How can I determine in my program whether I have successfully created a file? Update 4 July: It was a silly oversight of me not to check the result from close(). Unfortunately, the file can be closed without error. So that didn't help. What about fsync()? That sounds like a good idea, but that didn't catch the error either. There might be some interesting information in /sys if I had such a thing. I believe that didn't get added until 2.6.?. The comment(s) about the quality of my flash drive are probably justified. It's one of the earlier ones. In fact, write protect switches seem to be extremely rare these days. I think I have to use the overkill option: Create a file, unmount & remount the drive, and check to see if the file is there. If that doesn't solve my problem, then something is really messed up! Note to myself: Make sure the file you try to create isn't already there! By the way, this does happen to be a C++ program. You can tell by the .c_str() which I had intended to edit out for simplicity.

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  • How to catch segmentation fault in Linux?

    - by Alex Farber
    I need to catch segmentation fault in third party library cleanup operations. This happens sometimes just before my program exits, and I cannot fix the real reason of this. In Windows programming I could do this with __try - __catch. Is there cross-platform or platform-specific way to do the same? I need this in Linux, gcc.

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  • LF/CR issue with RS232 in Linux

    - by Albinoswordfish
    I've been having this problem where anytime I send a 0xA through an RS-232 in a Linux OS the receiver interprets that as 2 bytes, 0xD and 0xA. Also whenever I receive 0xD the serial port interprets that as 0xA. I've been reading that there are known issues regarding this, has anybody been able to find a solution?

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  • How to write text files with DOS line endings on linux

    - by gaumann
    I want to write text files with DOS/Windows line endings '\r\n' using python running on Linux. It seems to me that there must be a better way than manually putting a '\r\n' at the end of every line or using a line ending conversion utility. Ideally I would like to be able to do something like assign to os.linesep the separator that I want to use when writing the file. Or specify the line separator when I open the file.

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  • What is system() in linux

    - by Satish Patel
    I am an absolute beginner with Linux Operating system and just for fun in terminal I typed system() what happened next is as below: satish@satish-Inspiron-N5010 ~ $ system() >#include<iostream> >int main() bash: syntax error near unexpected token 'int' satish@satish-Ispiron-N5010~ $ Here I want to know that what is system() ? what is it's role here? why I got error in int main() line? What can we do with C/C++ programming in terminal?

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  • Using python to write text files with DOS line endings on linux

    - by gaumann
    I want to write text files with DOS/Windows line endings '\r\n' using python running on Linux. It seems to me that there must be a better way than manually putting a '\r\n' at the end of every line or using a line ending conversion utility. Ideally I would like to be able to do something like assign to os.linesep the separator that I want to use when writing the file. Or specify the line separator when I open the file.

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  • Winforms for Mono on Mac, Linux and PC (Redux)

    - by yar
    (I asked this question in another way, and got some interesting responses but I'm not too convinced.) Is Mono's GtkSharp truly cross-platform? It seems to be Gnome based... how can that work with PC and Mac? Can someone give me examples of a working Mac/PC/Linux app that is written with a single codebase in Microsoft .Net?

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  • What's a good Lua IDE for linux?

    - by Brendan Abel
    I'm looking for a lua IDE on linux. The majority of suggestions I've seen so far are windows only. I would have liked to use one of the Eclipse plugins for lua, but both of them -- LuaEclipse and LunarEclipse -- haven't been updated in nearly two years, and don't seem to work with Eclipse 3.5. If you have had any luck in getting lua working in Eclipse, I would be very interested.

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  • Howto compile a static library in linux

    - by Summer_More_More_Tea
    Hi folks: I have a question: How to compile a static library in linux with gcc, i.e. I need to compile my source code into a file named out.a. Is it sufficient to simply compile with the command gcc -o out.a out.c? I'm not quite familiar with gcc, hope anyone can give me a hand. Thanks Regards.

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  • Convert UTF-16 to UTF-8 under Windows and Linux, in C

    - by DooriBar
    I was wondering if there is a recommended 'cross' Windows and Linux method for the purpose of converting strings from UTF-16LE to UTF-8? or one should use different methods for each environment? I've managed to google few references to 'iconv' , but for somreason I can't find samples of basic conversions, such as - converting a wchar_t UTF-16 to UTF-8. Anybody can recommend a method that would be 'cross', and if you know of references or a guide with samples, would very appreciate it. Thanks, Doori Bar

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