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• No Wireless Networks, BCM4313 [duplicate]

  - by TalonPlz

  This question already has an answer here: How to Install Broadcom Wireless Drivers (BCM43xx) 38 answers Just bought this little Asus 10 inch laptop that came with Ubuntu 12.04. Everything at my home was fine: Wireless identified and connected. As soon as I went to my girlfriend's house the trouble started. I couldn't connect to wireless (authentication... times out and asks for authentication) I started doing internet searching, tried a few solutions posted on line using terminal commands. No solutions. I decided to upgraded to 12.10-13.04 and that left me with a worse problem: I can no longer see ANY networks what so ever. Wireless card is ON, with out a doubt. Wired connection works. I have been fumbling with driver versions to no .avail, and have no idea which driver I am currently running I have a vague idea of what terminal lines to run: lshw: resources: irq:17 memory:f7d00000-f7dfffff *-network description: Wireless interface product: BCM4313 802.11b/g/n Wireless LAN Controller vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:02:00.0 logical name: eth2 version: 01 serial: dc:85:de:56:c4:ea width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=wl0 driverversion=6.20.155.1 (r326264) latency=0 multicast=yes wireless=IEEE 802.11abg resources: irq:17 memory:f7d00000-f7d03fff iwconfig: eth1 no wireless extensions. eth2 IEEE 802.11abg ESSID:off/any Mode:Managed Access Point: Not-Associated Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off lo no wireless extensions. I am new and excited to start my Ubuntu and Linux life and this is only the first of my few hic cups i am sure! :) Thanks all UPDATE: Report from 2nd answer talon@Black1015E:~$ sudo apt-get remove --purge bcmwl-kernel-source [sudo] password for talon: Reading package lists... Done Building dependency tree Reading state information... Done Package 'bcmwl-kernel-source' is not installed, so not removed 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. talon@Black1015E:~$ wget http://us.archive.ubuntu.com/ubuntu/pool/restricted/b/bcmwl/bcmwl-kernel-source_5.100.82.112+bdcom-0ubuntu3_amd64.deb --2013-10-22 18:50:32-- http://us.archive.ubuntu.com/ubuntu/pool/restricted/b/bcmwl/bcmwl-kernel-source_5.100.82.112+bdcom-0ubuntu3_amd64.deb Resolving us.archive.ubuntu.com (us.archive.ubuntu.com)... 2001:67c:1562::15, 2001:67c:1562::13, 2001:67c:1562::14, ... Connecting to us.archive.ubuntu.com (us.archive.ubuntu.com)|2001:67c:1562::15|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 1181334 (1.1M) [application/x-debian-package] Saving to: ‘bcmwl-kernel-source_5.100.82.112+bdcom-0ubuntu3_amd64.deb’ 100%[======================================>] 1,181,334 3.37MB/s in 0.3s 2013-10-22 18:50:33 (3.37 MB/s) - ‘bcmwl-kernel-source_5.100.82.112+bdcom-0ubuntu3_amd64.deb’ saved [1181334/1181334] talon@Black1015E:~$ arvh No command 'arvh' found, did you mean: Command 'arch' from package 'coreutils' (main) arvh: command not found talon@Black1015E:~$ arch x86_64 talon@Black1015E:~$ sudo dpkg -i bcmwl*.deb Selecting previously unselected package bcmwl-kernel-source. (Reading database ... 171895 files and directories currently installed.) Unpacking bcmwl-kernel-source (from bcmwl-kernel-source_5.100.82.112+bdcom-0ubuntu3_amd64.deb) ... Setting up bcmwl-kernel-source (5.100.82.112+bdcom-0ubuntu3) ... Loading new bcmwl-5.100.82.112+bdcom DKMS files... First Installation: checking all kernels... Building only for 3.8.0-32-generic Building for architecture x86_64 Building initial module for 3.8.0-32-generic Done. wl: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-32-generic/updates/dkms/ depmod........ DKMS: install completed. Error: Module b43 is not currently loaded Error: Module b43legacy is not currently loaded Error: Module ssb is not currently loaded Error: Module bcm43xx is not currently loaded Error: Module brcm80211 is not currently loaded Error: Module brcmfmac is not currently loaded update-initramfs: deferring update (trigger activated) Processing triggers for initramfs-tools ... update-initramfs: Generating /boot/initrd.img-3.8.0-32-generic rebooting now

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• Ubuntu 12.04 Hp G72 Problem Installing proprietary wireless driver

  - by user69402

  I have a fresh Ubuntu 12.04 installed on HP G72 machine. In order for my wireless to work I need the proprietary driver installed - Broadcom STA wireless driver. Trying to install it from the System Settings gives me the error: "Sorry, installation of this driver failed. Please have a look at the log file for details: /var/log/jockey.log". So far I suspect the error to be caused by the bad "bcmwl-kernel-source" installation. What i tried: 1. remove "bcmwl-kernel-source" 2. install "bcmwl-kernel-source" installation through the terminal ends with "error code (1)". I would greatly appreciate any help Here is everything that the terminal returns: Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: bcmwl-kernel-source 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 0 B/1,151 kB of archives. After this operation, 3,514 kB of additional disk space will be used. Selecting previously unselected package bcmwl-kernel-source. (Reading database ... 170331 files and directories currently installed.) Unpacking bcmwl-kernel-source (from .../bcmwl-kernel-source_5.100.82.38+bdcom-0ubuntu6.1_amd64.deb) ... Setting up bcmwl-kernel-source (5.100.82.38+bdcom-0ubuntu6.1) ... Loading new bcmwl-5.100.82.38+bdcom DKMS files... /usr/sbin/dkms: line 467: unset: POST_REMOVE$PRE_BUMLD': not a valid identifier /usr/sbin/dkms: line 467: unset:BUILD_E\CLUWIVE_ARCH': not a valid identifier /usr/sbin/dkms: line 467: unset: $': not a valid identifier /usr/sbin/dkms: line 467: unset:$': not a valid identifier /usr/sbin/dkms: line 467: unset: modules_conf_arra}': not a valid identifier /usr/sbin/dkms: line 467: unset:$': not a valid identifier /usr/sbin/dkms: line 467: unset: $': not a valid identifier /usr/sbin/dkms: line 467: unset:$': not a valid identifier /usr/sbin/dkms: line 467: unset: $': not a valid identifier /usr/sbin/dkms: line 467: unset:$': not a valid identifier /usr/sbin/dkms: line 467: unset: `$': not a valid identifier /usr/sbin/dkms: line 419: ${!POST_REMOVE$PRE_BUMLD[@]}: bad substitution /usr/sbin/dkms: line 419: ${!BUILD_E\CLUWIVE_ARCH[@]}: bad substitution /usr/sbin/dkms: line 419: ${!$[@]}: bad substitution /usr/sbin/dkms: line 419: ${!$[@]}: bad substitution /usr/sbin/dkms: line 419: ${!$[@]}: bad substitution /usr/sbin/dkms: line 419: ${!$[@]}: bad substitution /usr/sbin/dkms: line 419: ${!$[@]}: bad substitution /usr/sbin/dkms: line 419: ${!$[@]}: bad substitution /usr/sbin/dkms: line 419: ${!$[@]}: bad substitution /usr/sbin/dkms: line 419: ${!$[@]}: bad substitution malloc: ../bash/subst.c:3671: assertion botched free: start and end chunk sizes differ Aborting.../tmp/tmp.pEXTnftUfI: line 4: modules_conf_arra}[[@]}]=[[@]}]}: command not found dkms.conf: Error! No 'DEST_MODULE_LOCATION' directive specified for record #0. dkms.conf: Error! Directive 'DEST_MODULE_LOCATION' does not begin with '/kernel', '/updates', or '/extra' in record #0. dkms.conf: Error! No 'PACKAGE_VERSION' directive specified. Error! Bad conf file. File: /usr/src/bcmwl-5.100.82.38+bdcom/dkms.conf does not represent a valid dkms.conf file. dpkg: error processing bcmwl-kernel-source (--configure): subprocess installed post-installation script returned error exit status 8 Errors were encountered while processing: bcmwl-kernel-source E: Sub-process /usr/bin/dpkg returned an error code (1)

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• 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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• ubuntu: sem_timedwait not waking (C)

  - by gillez

  I have 3 processes which need to be synchronized. Process one does something then wakes process two and sleeps, which does something then wakes process three and sleeps, which does something and wakes process one and sleeps. The whole loop is timed to run around 25hz (caused by an external sync into process one before it triggers process two in my "real" application). I use sem_post to trigger (wake) each process, and sem_timedwait() to wait for the trigger. This all works successfully for several hours. However at some random time (usually after somewhere between two and four hours), one of the processes starts timing out in sem_timedwait(), even though I am sure the semaphore is being triggered with sem_post(). To prove this I even use sem_getvalue() immediately after the timeout, and the value is 1, so the timedwait should have been triggered. Please see following code: #include <stdio.h> #include <time.h> #include <string.h> #include <errno.h> #include <semaphore.h> sem_t trigger_sem1, trigger_sem2, trigger_sem3; // The main thread process. Called three times with a different num arg - 1, 2 or 3. void *thread(void *arg) { int num = (int) arg; sem_t *wait, *trigger; int val, retval; struct timespec ts; struct timeval tv; switch (num) { case 1: wait = &trigger_sem1; trigger = &trigger_sem2; break; case 2: wait = &trigger_sem2; trigger = &trigger_sem3; break; case 3: wait = &trigger_sem3; trigger = &trigger_sem1; break; } while (1) { // The first thread delays by 40ms to time the whole loop. // This is an external sync in the real app. if (num == 1) usleep(40000); // print sem value before we wait. If this is 1, sem_timedwait() will // return immediately, otherwise it will block until sem_post() is called on this sem. sem_getvalue(wait, &val); printf("sem%d wait sync sem%d. val before %d\n", num, num, val); // get current time and add half a second for timeout. gettimeofday(&tv, NULL); ts.tv_sec = tv.tv_sec; ts.tv_nsec = (tv.tv_usec + 500000); // add half a second if (ts.tv_nsec > 1000000) { ts.tv_sec++; ts.tv_nsec -= 1000000; } ts.tv_nsec *= 1000; /* convert to nanosecs */ retval = sem_timedwait(wait, &ts); if (retval == -1) { // timed out. Print value of sem now. This should be 0, otherwise sem_timedwait // would have woken before timeout (unless the sem_post happened between the // timeout and this call to sem_getvalue). sem_getvalue(wait, &val); printf("!!!!!! sem%d sem_timedwait failed: %s, val now %d\n", num, strerror(errno), val); } else printf("sem%d wakeup.\n", num); // get value of semaphore to trigger. If it's 1, don't post as it has already been // triggered and sem_timedwait on this sem *should* not block. sem_getvalue(trigger, &val); if (val <= 0) { printf("sem%d send sync sem%d. val before %d\n", num, (num == 3 ? 1 : num+1), val); sem_post(trigger); } else printf("!! sem%d not sending sync, val %d\n", num, val); } } int main(int argc, char *argv[]) { pthread_t t1, t2, t3; // create semaphores. val of sem1 is 1 to trigger straight away and start the whole ball rolling. if (sem_init(&trigger_sem1, 0, 1) == -1) perror("Error creating trigger_listman semaphore"); if (sem_init(&trigger_sem2, 0, 0) == -1) perror("Error creating trigger_comms semaphore"); if (sem_init(&trigger_sem3, 0, 0) == -1) perror("Error creating trigger_vws semaphore"); pthread_create(&t1, NULL, thread, (void *) 1); pthread_create(&t2, NULL, thread, (void *) 2); pthread_create(&t3, NULL, thread, (void *) 3); pthread_join(t1, NULL); pthread_join(t2, NULL); pthread_join(t3, NULL); } The following output is printed when the program is running correctly (at the start and for a random but long time after). The value of sem1 is always 1 before thread1 waits as it sleeps for 40ms, by which time sem3 has triggered it, so it wakes straight away. The other two threads wait until the semaphore is received from the previous thread. [...] sem1 wait sync sem1. val before 1 sem1 wakeup. sem1 send sync sem2. val before 0 sem2 wakeup. sem2 send sync sem3. val before 0 sem2 wait sync sem2. val before 0 sem3 wakeup. sem3 send sync sem1. val before 0 sem3 wait sync sem3. val before 0 sem1 wait sync sem1. val before 1 sem1 wakeup. sem1 send sync sem2. val before 0 [...] However, after a few hours, one of the threads begins to timeout. I can see from the output that the semaphore is being triggered, and when I print the value after the timeout is is 1. So sem_timedwait should have woken up well before the timeout. I would never expect the value of the semaphore to be 1 after the timeout, save for the very rare occasion (almost certainly never but it's possible) when the trigger happens after the timeout but before I call sem_getvalue. Also, once it begins to fail, every sem_timedwait() on that semaphore also fails in the same way. See the following output, which I've line-numbered: 01 sem3 wait sync sem3. val before 0 02 sem1 wakeup. 03 sem1 send sync sem2. val before 0 04 sem2 wakeup. 05 sem2 send sync sem3. val before 0 06 sem2 wait sync sem2. val before 0 07 sem1 wait sync sem1. val before 0 08 !!!!!! sem3 sem_timedwait failed: Connection timed out, val now 1 09 sem3 send sync sem1. val before 0 10 sem3 wait sync sem3. val before 1 11 sem3 wakeup. 12 !! sem3 not sending sync, val 1 13 sem3 wait sync sem3. val before 0 14 sem1 wakeup. [...] On line 1, thread 3 (which I have confusingly called sem1 in the printf) waits for sem3 to be triggered. On line 5, sem2 calls sem_post for sem3. However, line 8 shows sem3 timing out, but the value of the semaphore is 1. thread3 then triggers sem1 and waits again (10). However, because the value is already 1, it wakes straight away. It doesn't send sem1 again as this has all happened before control is given to thread1, however it then waits again (val is now 0) and sem1 wakes up. This now repeats for ever, sem3 always timing out and showing that the value is 1. So, my question is why does sem3 timeout, even though the semaphore has been triggered and the value is clearly 1? I would never expect to see line 08 in the output. If it times out (because, say thread 2 has crashed or is taking too long), the value should be 0. And why does it work fine for 3 or 4 hours first before getting into this state? This is using Ubuntu 9.4 with kernel 2.6.28. The same procedure has been working properly on Redhat and Fedora. But I'm now trying to port to ubuntu! Thanks for any advice, Giles

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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 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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• Linux TCP stack packet injection

  - by Cem Cahit

  Could i inject packets to Linux TCP stack without modifying the ethernet driver? Could i do this with using a library or sth ? Thank you,

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• How to convert PE(Portable Executable) format to ELF in linux

  - by Aman Jain

  Hi Whats the best tool for converting PE binaries to ELF binaries? Preferably, it should be a linux utility. Thanks

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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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• Desktop Development Environment that Compiles to Linux, Mac OS, and Windows

  - by infocyde

  Hi, is there any development environments that allow you to have one code base that can compile to Linux, Mac OS, and Windows versions without much tweaking? I know this is like asking for where the Holy Grail is burred, but maybe such a thing exists. Thanks.

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• Any rsync frontend that supports SSH for Linux ?

  - by user248959

  Hi, any rsync frontend that works with SSH for Linux ? I tried Unison, but i think it needs the server has installed also Unison. Regards Javi

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• How can I setup my ubuntu environment to run a linux application on framebuffer

  - by hap497

  Hi, Can you please tell me how can I setup my ubuntu environment with a framebuffer? And then how can I run my gtk program with it? I am using gnome as my window manager in my ubuntu environment. So if I run my gtk linux program with it, do I expect to see anything on screen? Thank you for any help/pointers.

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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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• 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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• 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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• how to develope the iphone application in linux or windows

  - by saravanan

  Hi i like to develop iphone application. how to develop the iphone application in linux or window. please do reply me.

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• CAFF creation on Windows (or Linux)

  - by Alexander Gladysh

  On OS X I use this command to convert a sound file to CAFF for iPhone. afconvert -f caff -d LEI16@44100 file.wav file.caf I need to do the same on a Windows box. Any clues? I'd even settle for a Linux version.

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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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• How to troubleshoot an unresponsive Java application/process in Linux

  - by Sasha

  Say your application is unresponsive and you cannot attach a debugger to it, as it rejects everything. All you have is a Linux Bash and process id. How would you investigate the issue? What tools would you use? My goal is to better my troubleshooting skills using Java. This particular issue we had in production, on customer site.

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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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• Is it possible to run Weblogic with 8gb heap size in a 64bit java/linux environment

  - by Per Arneng

  Setup: 64bit Linux 64bit SUN Jvm 1.6.0_20 Weblogic 10.3 Is it possible to run Weblogic 10.3 in this setup with a maximum heap size of 8gb? We have recived answers from oracle support that states that it might not be possible to address more than 4gb with this setup. Please submit any official links that support any statements that it is possible to run this setup with more than 4gb of heap size. We can not find any documentation of any limits of heap size when running with this setup. Thanx

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