openSUSE Programming June 2006

programming@lists.opensuse.org

23 participants
11 discussions

False memleak detected?
by Verdi March 09 Jul '06

09 Jul '06

Hi, Valgrind detected memleak on one of my test case, which is a standard, textbook insertion sort. However, I don't see any problem with the testcase. I'm wondering if this is a false alarm, and should submit a bug report. I'm using SuSE 10.1, and valgrind-3.2.0-11.1 from opensuse build service. The followings are the test case and the output of valgrind. I've marked the offending line (line 36) in the testcase. /************************** Test Case ************************/ #include <stdio.h> #include <stdlib.h> typedef struct _int_struct { int i; struct _int_struct *next; } IntStruct; typedef struct _int_list { IntStruct *head; } IntList; int insert(IntList *ilist, int i); int insertion_sort(IntList *ilist, IntStruct *is); int main() { IntStruct *is; IntList ilist; ilist.head = NULL; insert(&ilist, 500); insert(&ilist, 100); printf("ilist: "); for (is = ilist.head; is; is = is->next) printf("%d ", is->i); printf("\n"); return 0; } int insert(IntList *ilist, int i) { IntStruct *is = (IntStruct *) calloc(1, sizeof(IntStruct)); /* line 36 */ is->i = i; return insertion_sort(ilist, is); } int insertion_sort(IntList *ilist, IntStruct *is) { IntStruct **isp; for (isp = &ilist->head; *isp; isp = &((*isp)->next)) { if (is->i < (*isp)->i) { is->next = *isp; break; } else if (is->i == (*isp)->i) { /* return FALSE; */ return 0; } } *isp = is; /* return TRUE; */ return 1; } /***********************************************************/ /************************ Valgrind Output ******************/ $ valgrind -q --leak-check=full ./a.out ilist: 100 500 ==15413== ==15413== 16 (8 direct, 8 indirect) bytes in 1 blocks are definitely lost in loss record 2 of 2 ==15413== at 0x40206D5: calloc (vg_replace_malloc.c:279) ==15413== by 0x80484CD: insert (coba.c:36) ==15413== by 0x8048461: main (coba.c:24) /***********************************************************/ -- Regards, Verdi -- Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer

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Beginer Java tips, for a profesional
by Jerry Westrick 05 Jul '06

05 Jul '06

Hello to all... I'm starting a small project in JAVA, just to gather a little experience with it. The project I picked is a FIX (http://www.fixprotocol.org) message viewer. It's comething that I think can be used, and a topic I have lots of experience with, so that I can consentrate on the JAVA. I'm using SUSE 10.1 as development platform. I have extensive experience in programming (COBOL, PL/I, 360 Assembler, C/C++, Smalltalk, Prolog, Perl, Python, just mention a few) and feel it's time I did a little JAVA. So anyone have tips, and gotchas I should watch out for? Suggestions for how to get into a workbench with little effort? Thx. for your help Jerry

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make ignoring changes to source-files
by Michael Dominok 26 Jun '06

26 Jun '06

Hi List, Well the subject says it all. "Sometimes"[0] make[1] misses that the (c-)sources it should compile have been changed. Quiet a niusance. Has anybody come across that, too? Cheers Michael [0] Unfortunately this behaviour is not reproducable. 8-( [1] make 3.80, gcc 4.02, SuSE 10

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Re: [suse-programming-e] Kdevelop - Ruby
by eriic1＠cox.net 26 Jun '06

26 Jun '06

---- Graham Smith <gqs(a)westnet.com.au> wrote: > Hi, > > I'm just starting to try and program using Qt and ruby using kdevelop version > 3.3.3 on SuSE 10.0. > > As a starter I'm trying to get a very simple application working as per > http://www.kdevelop.org/doc/technotes/rubyrad.html > > Now either I'm doing something wrong or there is something missing in the > steps shown in the above document. On building the project the button does > not appear on the window. The button widget does not appear to be created in > any of the files. > > Does anyone know what I'm doing wrong. > > -- > Regards, > > Graham Smith I don't know anything about Ruby, but out of curiosity I checked out the example using Kdevelop 3.3.1 on SUSE 9.2. I found that when I changed the name of the form to MainBase, it did not get updated in the mainbase.ui file. I ended up changing the line: class MainImpl < Form1 to class MainImpl < MainBase. This made the pushbutton show up. Hope this helps, Eric

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Kdevelop - Ruby
by Graham Smith 24 Jun '06

24 Jun '06

Hi, I'm just starting to try and program using Qt and ruby using kdevelop version 3.3.3 on SuSE 10.0. As a starter I'm trying to get a very simple application working as per http://www.kdevelop.org/doc/technotes/rubyrad.html Now either I'm doing something wrong or there is something missing in the steps shown in the above document. On building the project the button does not appear on the window. The button widget does not appear to be created in any of the files. Does anyone know what I'm doing wrong. -- Regards, Graham Smith

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RE: [suse-programming-e] False memleak detected?
by Phil Betts 20 Jun '06

20 Jun '06

Verdi March wrote on Monday, June 19, 2006 12:55 PM:: > Valgrind detected memleak on one of my test case, which is a standard, > textbook insertion sort. However, I don't see any problem with the > testcase. I'm wondering if this is a false alarm, and should submit a > bug report. The reason you're getting the report is because ilist is local to main(). After leaving main() which is where valgrind does its leakage tests, there is no longer a list, so there can be no references to the allocated nodes. If you make ilist global, valgrind is silent. Believe valgrind - it is wiser than mere humans! There IS a very real leak that your example doesn't reveal: > } else if (is->i == (*isp)->i) { > /* return FALSE; */ > return 0; > } If you try to insert a node that is already in the list, "is" is not linked into the list, and the caller (i.e. insert) has already relinquished control so has no way of releasing the node. You would be better off changing the code so that the calloc is only performed once you've identified the need to insert the node (i.e. after the for-loop in insertion_sort()) Phil -- ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the H.E Information Systems Ltd. Tel: 0161 866 9066 Web: www.heis.co.uk This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.clearswift.com **********************************************************************

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for local communication only - UNIX or INET?
by Per Jessen 18 Jun '06

18 Jun '06

I'm mostly curious - wath are the pros and cons of using a local UNIX socket vs. an INET socket? E.g. having a daemon listen on /var/lib/xxx/yyy.soc instead of localhost:nnnnn ? (it is assumed that everyone involved will have the choice of using either one). Any likely performance impacts (positive or negative)? /Per Jessen, Zürich

5 11

printing in emacs
by John D Lamb 13 Jun '06

13 Jun '06

Can anybody suggest how I set this up? I'd like pretty-printed pages of C++ from emacs on SuSE 10.1. I used to use pretty-print on xemacs. Postscript print on emacs produces PostScript errors at the moment; so I'm using Kate for printing. Just in case I provoke any zealotry, I use vi mode in emacs. I've switched from xemacs because emacs now looks better and works with AucTeX. And sometimes I use vim when I jsut want to do something quickly. -- JDL

3 6

C-Fortran interface
by Maura Edeweiss Monville 07 Jun '06

07 Jun '06

I do not have experience of interfacing Fortran with C.. I mean exchanging and sharing data between C routines and Fortran routines linked together. I would appreciate some guidelines how to do that. Basically, assume the following common block is defined in a fortran routine called "m1505.f": COMMON/LEXP/DLEXP,TO,AINT That is the Fortran routine defined the common block named "LEXP" containing the three valiables DLEXP, TO, AINT Now assume that such a Fortran routine is linked to some C routines and some Tcl/Tk procedures through a GNUmakefile. How can I, from inside a C routine, access the content of the variable AINT in the common block LEXP ? Thank you in advance for any suggestion. Maura

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Summary of 10.1 Issues and Solutions or Work-Arounds?
by Randall R Schulz 07 Jun '06

07 Jun '06

Hi, I have not had the time to closely follow the seemingly voluminous postings on the issues that appear in the 10.1 release. (To the extent it has distinct problems, I'm most interested in the commercial distribution from Novell, which I've purchased and plan to install, first in a Parallels virtual machine on a MacBook Pro portable). I was wondering if there was a summary somewhere of what issues exist, which installation or configuration options trigger them and what is the current state of availability of fixes and / or work-arounds. Is there, perhaps, a Wiki entry or some "Cool Tips" on the Novell or openSUSE.org Web sites that hold this information? Or perhaps someone has an independent Web page or pages on these issues? The openSUSE.org Support Database (SDB) appears to have nothing. There appears to be no mention of problems on the openSUSE installation page nor on the Users' FAQ and How-To's pages. Some general Internet searching turned up some blog rants, but nothing that would help me avoid (or fill) the potholes. I should say I'm not in a hurry about this. If the solutions have yet to be devised or released, I'll wait, but before I do go ahead and attempt an installation, I'd like to have available a compendium of the problems in the stock distribution and what can or cannot be done about them. Thanks. Randall Schulz

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openSUSE Programming June 2006