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Re: [Playerstage-users] Doubts on Opaque Proxy
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From: Eshwaran V. <esh...@gm...> - 2008-02-23 23:25:27
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Hi
Yes, you are quite right. That solved it. Help regarding as to why try and
catch statements which are supposed to prevent errors from taking place are
returning a seg fault would be much appreciated.
Regards
Eshwaran
On Sun, Feb 24, 2008 at 4:47 AM, Toby Collett <tco...@pl...>
wrote:
> if your count is 4, then you are not transmitting a null on the end of the
> string, this means that any standard string functions, such as printf will
> not know when to terminate...this could also cause some other memory issues.
>
> Toby
>
>
> On 24/02/2008, Eshwaran VijayKumar <esh...@gm...> wrote:
> >
> > Hi
> > I tried running the code for Opaque proxy by updating to the latest CVS
> > version of player/stage.The code runs well in the absence of try and catch
> > statements but returns a segmentation fault otherwise.
> > I have posted the GDB BACKTRACE of the code when try and catch
> > statements are used:
> > [swarm@localhost libplayerc++]$ ./opq1
> > Segmentation fault
> > [swarm@localhost libplayerc++]$ gdb opq1
> > GNU gdb Red Hat Linux (6.6-35.fc8rh)
> > Copyright (C) 2006 Free Software Foundation, Inc.
> > GDB is free software, covered by the GNU General Public License, and you
> > are
> > welcome to change it and/or distribute copies of it under certain
> > conditions.
> > Type "show copying" to see the conditions.
> > There is absolutely no warranty for GDB. Type "show warranty" for
> > details.
> > This GDB was configured as "i386-redhat-linux-gnu"...
> > (no debugging symbols found)
> > Using host libthread_db library "/lib/libthread_db.so.1".
> > (gdb) run
> > Starting program:
> > /home/swarm/Documents/player/examples/libplayerc++/opq1
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/ac/2eeb206486bb7315d6ac4cd64de0cb50838ff6.debug
> > (no debugging symbols found)
> > (no debugging symbols found)
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/e8/38ce6093590b08883fd28e6008fb91964ef067.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/59/2af63ddff2a1ff221065e557f938cc2cb25cc7.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/88/27308433e33aeefb560f42fb133577c8936f20.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/92/8ab51a53627c59877a85dd9afecc1619ca866c.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/db/8cb95645d5df469d4aece301cdb5e60087be21.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/ba/4ea1118691c826426e9410cafb798f25cefad5.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/6c/1cdbb38ae2a292613c8c31195417ee80ea7e1e.debug
> > [Thread debugging using libthread_db enabled]
> > [New process 4455]
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/d0/b716d925c00494a40cff204a21530d0b96df8b.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/e3/3448de964a5ca97b70edbdcea227c6ea5d3657.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/04/aefaf601793e8d276f6b6c6f4da080babe3faf.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/07/b722c2a7fed5b96cf4b40ce0f2a06eb0f8d2fc.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/36/f3124773ab53b99593686f41e2db7beb736d44.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/db/a292aff9720bfc3f25c53fa8e469168460a894.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/59/90d96516d0966b3e75c018e6129eee43965a6a.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/fa/4de2ee94deb82d3b7b6dddba32b4cbfb94dd8e.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/cc/a2a51671562775f944bce85a9476972b6994c8.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/34/0daf994019a9e2655d5c027d938d489510070c.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/03/5807c541381466da2f8457545e62c87066fd4f.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/90/ebf9c172c9332feed316b7c0fdff30ce1a15ae.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/8a/cc903fa48e73406552c64938e7866699a10801.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/54/97ce83a1cf21660e17bef3f4831e2f24afe795.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/41/b572ad1b8e3fac8fb0dadf6bcc2b61ef6e08a9.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/60/d593e7987c4f31a338bf509b15d713aa1fe1fb.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/7c/f32ecc91202c1747b80e3356a6828ae7ee97e7.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/13/e7ce3022231431f7402aed8afd467f81d091f0.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/0d/605d38e5e2d23fb14837dd95144b2d330b946c.debug
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/87/d66bafb3c5d1af9e5a91a447ef5efcc0a3ec3c.debug
> > [New Thread -1208793392 (LWP 4455)]
> >
> > warning: Missing the separate debug info file:
> > /usr/lib/debug/.build-id/a7/eabb854181ef5ff0c22b78c3e5048c64a2ebb8.debug
> >
> > Program received signal SIGSEGV, Segmentation fault.
> > [Switching to Thread -1208793392 (LWP 4455)]
> > 0x0804990e in main ()
> >
> > Also another problem is that the output I am getting is
> > abcd@K-
> > count=4getcount4
> > opGetData[0]=a
> > opGetData[1]=b
> > opGetData[2]=c
> > opGetData[3]=d
> >
> > I would like to know why garbage values are being displayed after
> > "abcd"?
> >
> > Regards
> > Eshwaran
> >
> >
> >
> > On Fri, Feb 22, 2008 at 12:04 AM, Toby Collett <
> > tco...@pl...> wrote:
> >
> > > Have you tried the CVS version of player, there are many memory fixes
> > > that have not made it into a release yet, if the CVS version doesnt work
> > > then we can track down the fault in there.
> > >
> > > Toby
> > >
> > >
> > > On 22/02/2008, Eshwaran VijayKumar <esh...@gm...>
> > > wrote:
> > > >
> > > > Hi
> > > > Thanks for your reply Vimal. I will try out your
> > > > suggestion.Please do inform me if there is any other
> > > > alternative/Patch which can get Opaque Interface working on the current
> > > > version of Player/Stage V2.10 RC1 ? (I don't want to have to revert
> > > > to an earlier version unless i really have to:))
> > > >
> > > > Thanks in advance,
> > > > Regards
> > > > Eshwaran
> > > >
> > > >
> > > >
> > > > On Thu, Feb 21, 2008 at 9:55 PM, VIMAL MEHTA <vim...@ya...>
> > > > wrote:
> > > >
> > > > > Hi
> > > > >
> > > > > Even I tried the same versions of player stage as u did and I get
> > > > > the same errors.
> > > > >
> > > > > So i download player 2.0.5 and stage 2.0.4 and opaque proxy works
> > > > > fine with them
> > > > >
> > > > > Hope this helps.
> > > > > Thanks
> > > > >
> > > > > Vimal
> > > > >
> > > > >
> > > > > *Eshwaran VijayKumar <esh...@gm...>* wrote:
> > > > >
> > > > > Hi,
> > > > > I tried using a section of code posted by Yashan Sun earlier to
> > > > > try working with Opaque Proxy. I am using Player V2.10RC1 and
> > > > > Stage V2.10 RC1. When I try running the code, I get a
> > > > > segmentation fault. I have posted the code I am using and a gdb back trace.
> > > > > Any help would be much appreciated.
> > > > >
> > > > > CFG FILE:
> > > > > driver
> > > > > (
> > > > > name "stage"
> > > > > provides ["simulation:0" ]
> > > > > plugin "libstageplugin"
> > > > >
> > > > > # load the named file into the simulator
> > > > > worldfile "opq.world"
> > > > > )
> > > > >
> > > > >
> > > > > driver
> > > > > (
> > > > > name "stage"
> > > > > provides ["6665:position2d:0" "6665:laser:0"]
> > > > >
> > > > > model "robot1"
> > > > > )
> > > > >
> > > > >
> > > > > driver(
> > > > > name "relay"
> > > > > provides ["6665:opaque:0"]
> > > > > )
> > > > >
> > > > >
> > > > > CC FILE:
> > > > > #include <libplayerc++/playerc++.h>
> > > > > #include <libplayerc/playerc.h>
> > > > > #include <iostream>
> > > > > #include "args.h"
> > > > >
> > > > > int
> > > > > main(int argc, char **argv)
> > > > > {
> > > > > parse_args(argc,argv);
> > > > >
> > > > > try
> > > > > {
> > > > > using namespace PlayerCc;
> > > > > using namespace std;
> > > > >
> > > > > PlayerClient robot(gHostname, gPort);
> > > > > Position2dProxy pp(&robot, gIndex);
> > > > > LaserProxy lp(&robot, gIndex);
> > > > > OpaqueProxy op(&robot, gIndex);
> > > > > player_opaque_data_t opData;
> > > > > uint8_t opGetData[1024];
> > > > > for(;;)
> > > > > {
> > > > > robot.Read();
> > > > >
> > > > > opData.data_count = 3;
> > > > > opData.data[0]='a';
> > > > > opData.data[1]='b';
> > > > > opData.data[2]='c';
> > > > > op.SendCmd(&opData);
> > > > > std::cout << opData.data << std::endl;
> > > > > uint count = op.GetCount();
> > > > > std::cout << "count=" << count << std::endl;
> > > > > op.GetData(opGetData);
> > > > > std::cout << "opGetData[0]=" << opGetData[0] << std::endl;
> > > > > std::cout << "opGetData[1]=" <<opGetData[1] << std::endl;
> > > > > std::cout << "opGetData[2]=" <<opGetData[2] << std::endl;
> > > > > //std::cout << "opGetData[3]=" <<opGetData[3] << std::endl;
> > > > > }
> > > > > }
> > > > > catch (PlayerCc::PlayerError e)
> > > > > {
> > > > > std::cerr << e << std::endl;
> > > > > return -1;
> > > > > }
> > > > > }
> > > > >
> > > > > GDB BACK TRACE:
> > > > > [swarm@localhost libplayerc++]$ gdb opq1
> > > > > GNU gdb Red Hat Linux (6.6-35.fc8rh)
> > > > > Copyright (C) 2006 Free Software Foundation, Inc.
> > > > > GDB is free software, covered by the GNU General Public License,
> > > > > and you are
> > > > > welcome to change it and/or distribute copies of it under certain
> > > > > conditions.
> > > > > Type "show copying" to see the conditions.
> > > > > There is absolutely no warranty for GDB. Type "show warranty" for
> > > > > details.
> > > > > This GDB was configured as "i386-redhat-linux-gnu"...
> > > > > Using host libthread_db library "/lib/libthread_db.so.1".
> > > > > (gdb) run >opq1.txt
> > > > > Starting program: /home/swarm/Desktop/player-2.1.0rc1/examples/libplayerc++/opq1
> > > > > >opq1.txt
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/ac/2eeb206486bb7315d6ac4cd64de0cb50838ff6.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/e8/38ce6093590b08883fd28e6008fb91964ef067.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/59/2af63ddff2a1ff221065e557f938cc2cb25cc7.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/88/27308433e33aeefb560f42fb133577c8936f20.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/92/8ab51a53627c59877a85dd9afecc1619ca866c.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/db/8cb95645d5df469d4aece301cdb5e60087be21.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/ba/4ea1118691c826426e9410cafb798f25cefad5.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/6c/1cdbb38ae2a292613c8c31195417ee80ea7e1e.debug
> > > > > [Thread debugging using libthread_db enabled]
> > > > > [New process 9859]
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/d0/b716d925c00494a40cff204a21530d0b96df8b.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/e3/3448de964a5ca97b70edbdcea227c6ea5d3657.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/04/aefaf601793e8d276f6b6c6f4da080babe3faf.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/07/b722c2a7fed5b96cf4b40ce0f2a06eb0f8d2fc.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/db/a292aff9720bfc3f25c53fa8e469168460a894.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/59/90d96516d0966b3e75c018e6129eee43965a6a.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/fa/4de2ee94deb82d3b7b6dddba32b4cbfb94dd8e.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/cc/a2a51671562775f944bce85a9476972b6994c8.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/03/5807c541381466da2f8457545e62c87066fd4f.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/90/ebf9c172c9332feed316b7c0fdff30ce1a15ae.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/8a/cc903fa48e73406552c64938e7866699a10801.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/54/97ce83a1cf21660e17bef3f4831e2f24afe795.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/41/b572ad1b8e3fac8fb0dadf6bcc2b61ef6e08a9.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/60/d593e7987c4f31a338bf509b15d713aa1fe1fb.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/7c/f32ecc91202c1747b80e3356a6828ae7ee97e7.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/13/e7ce3022231431f7402aed8afd467f81d091f0.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/0d/605d38e5e2d23fb14837dd95144b2d330b946c.debug
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/87/d66bafb3c5d1af9e5a91a447ef5efcc0a3ec3c.debug
> > > > > [New Thread -1208587552 (LWP 9859)]
> > > > >
> > > > > warning: Missing the separate debug info file:
> > > > > /usr/lib/debug/.build-id/a7/eabb854181ef5ff0c22b78c3e5048c64a2ebb8.debug
> > > > >
> > > > > Program received signal SIGSEGV, Segmentation fault.
> > > > > [Switching to Thread -1208587552 (LWP 9859)]
> > > > > 0x080499cf in main (argc=Cannot access memory at address 0x0
> > > > > ) at opq1.cc:37
> > > > > 37 opData.data[0]='a';
> > > > >
> > > > >
> > > > > Thanks in advance,
> > > > >
> > > > > Regards,
> > > > > Eshwaran
> > > > >
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