openSUSE Programming May 2005

programming@lists.opensuse.org

29 participants
26 discussions

Packaging to customers: Solaris pkgadd, pkgrm, pkginfo etc replacement
by Pierre Patino 29 May '05

29 May '05

Dear experts: As we replace our embedded Sparcs running Solaris with some version of Linux, the question has been asked: What should replace our package management? I know next to nothing about rpm and apt. We release new software once a year or so. Any recommendations? TIA & Cheers

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TCP/IP man pages
by Hallingstad Håkon 27 May '05

27 May '05

I am browsing the man pages to find out how to create TCP/IP connections with the socket-, connect-, bind-, listen- and accept- functions, but could not find the information I needed from the corresponding man pages. (SuSE 9.1) Could SuSE please include a reference to ip(7) and/or tcp(7) in the description of the 'protocol' argument in socket(2)? Could SuSE please resolve the conflicting information between getprotoent(3) and ip(7)/tcp(7) on how to get the protocol number? Ip(7)/tcp(7) says 'protocol' should be either 0 or the macro IPPROTO_TCP, while socket(2) says 'protocol' should be gotten from the getprotoent(3) function call (which reads /etc/protocols). I would very much like to use a header file's macro IPPROTO_TCP instead of fetching a world-constant number from /etc/protocols. And it is the macros that are documented in Steven's UNIX Network Programming :-). Could SuSE please include a reference to ip(7)/tcp(7) in the description of the 'const struct sockaddr *serv_addr' argument in connect(2)? The text "Each communications space interprets the serv_addr parameter in its own way." is not very informative. How about making a paragraph based on the following from bind(2): "The rules used in name binding vary between address families. Consult the manual entries in Section 7 for detailed information. For AF_INET see ip(7), ...". > Regards, > Håkon Hallingstad > Software Developer, EDB > +47 4789 8062 > hakon.hallingstad(a)edb.com > www.edb.com <http://www.edb.com/> > >

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weird widgets
by Colin Carter 21 May '05

21 May '05

(Sorry if this is too long for hand held chatters.) Hi, I am starting to program for X Window and Xt. I am having a few problems. I have been reading extensively several books and much internet stuff, but unfortunately most examples are 'simple' and have limited usefullness and then the authors jump straight into some other system such as Qt. I would appreciate some discussion. Thank you, Colin The essence of my code: hMain = XtAppCreateShell(..., applicationShellWidgetClass, ...); // XResizeWindow: XtSetValues(hMain, args, NumArgs); (This works correctly.) // add a panel: hPanel = XtCreateManagedWidget("panel", panedWidgetClass, hMain, ...); point A // repeat the following paragraph as often required: strcpy( szTemp, "File"); Menu_button[++TopMenuID] = XtCreateManagedWidget( szTemp, menuButtonWidgetClass, hPanel, ...) point B Notes: args used for Setting button size: NumArgs = 0; XtSetArg(args[NumArgs], XtNwidth, MenuButtonWidth); NumArgs++; XtSetArg(args[NumArgs], XtNheight, MenuButtonHeight); NumArgs++; lines to be placed at either point A or point B : (initially at A) XtRealizeWidget(hMain); XtMapWidget( hPanel ); XFlush(TheDisplay); first problem: Button size is ignored - Why? Sizing works okay for main window/panel. Buttons appear full width "stacked" vertically so that the first dominates the screen and others can be seen as edges below first: ------------- : : : : : B1 : <-- this is on top : : : : ------------- : B2 : ------------- : B3 : ------------- second question: If I move the three lines from point A to point B then there is a reverse stack: Why? ------------- : B1 : ------------- : B2 : ------------- : : : : : B3 : <-- this is on top : : : : ------------- third question: If I create the buttons into the main window (not panel) thus: Menu_button[++TopMenuID] = XtCreateManagedWidget( szTemp, menuButtonWidgetClass, hMain, ...) the buttons are the correct size, but all are stacked exactly on top of each other so that only the last button is visible/accessable. Why? fourth question: Do you know how to (using the last version) space the buttons uniformly across the window? Regards, Colin PS: Please snip viscously after first read. PS: I don't want a lecture on "Why don't you use Qt, C++, Java, Basic, Pearl..." We have been through all that, and this is a question on X Window and Xt. It would be good to start a discussion on coding directly for X11 and maybe we can share ideas. Thank you.

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Distributing an appliance
by Rich Wilson 19 May '05

19 May '05

I have written an application which treats a computer much like an appliance- in most cases, the application will be set to automatically start whenever the computer is turned on, and the computer will not be used for other purposes. I'm trying to figure out how I can distribute this application so that users can install it themselves. What are the legalities of taking a current SUSE distribution CD, making a few changes to it, and selling it to customers? And how do I get the phone number of someone at Novell to ask this question of? Or, perhaps someone has a suggestion for a novice-friendly distribution I could use for this purpose. Thanks. Rich

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RE: [suse-programming-e] call a script in a script
by Patrick B. O'Brien 18 May '05

18 May '05

I ended up using /usr/local/bin/job & Thank you! -----Original Message----- From: Randall R Schulz [mailto:rschulz@sonic.net] Sent: Tuesday, May 17, 2005 6:08 AM To: suse-programming-e(a)suse.com Subject: Re: [suse-programming-e] call a script in a script Phil, On Tuesday 17 May 2005 01:46, Phil Betts wrote: > On Tuesday, May 17, 2005 2:23 AM, William A. Mahaffey III wrote: > >Patrick B. O'Brien wrote: > >>Using ksh. > >> > >>I want to call script_B from script_A. > >> > >>I don't not want script_A to hang around for script_B to finish. > >> > >>I tried bg but no joy. Script_A sits and waits for script_B to > >> finish before moving on; which is no good. Any thoughts and thank > >> you. > > > >inside script_A: > > > >(script_B &) > > > >The parentheses may not be required, my man page was for ksh on SGI, > > I don't have it on my SuSE 8.2 box. YMMV & all that. > > ... > > The parentheses create a new process which in turn creates a new > process for script_B (because of the &). On some systems (e.g. > cygwin on Windows), process creation carries a hefty price. Far > better is to use the ksh builtin exec command which replaces the > current process (i.e. "ksh script_A") with the new process (i.e. ksh > script_B). True. Parentheses are not simply for grouping (as you say, they create a sub-shell). You get simple grouping of a sequence of commands with {curly braces}. That kind of grouping is merely syntactic (and things like "exit" executed within them will cause the shell interpreting the script to exit. Bailing out of a {curly brace sequence} without exiting the shell that's executing it is what the "return" built-in is for. While what you say about process creation (fork) in Cygwin is true, I don't think we're really considering that here (this is a SuSE list, after all, and Cygwin is owned by RedHat...). > So, instead of the above, just: > > exec script_B Perhaps. Keep in mind that unless the shell that invoked script_A used "script_A &", it will end up waiting for script_B to complete. If you want the parent of script_A to continue on after it (script_A) starts script_B, then you must use "script_B &". "Exec script_B &" is equivalent to "script_B &". > ... > > Phil Randall Schulz -- To unsubscribe, email: suse-programming-e-unsubscribe(a)suse.com For additional commands, email: suse-programming-e-help(a)suse.com Archives can be found at: http://lists.suse.com/archive/suse-programming-e

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RE: [suse-programming-e] call a script in a script
by Phil Betts 17 May '05

17 May '05

On Tuesday, May 17, 2005 2:23 AM, William A. Mahaffey III wrote: >Patrick B. O'Brien wrote: > >>Using ksh. >> >>I want to call script_B from script_A. >> >>I don't not want script_A to hang around for script_B to finish. >> >>I tried bg but no joy. Script_A sits and waits for script_B to finish >>before moving on; which is no good. Any thoughts and thank you. > >inside script_A: > >(script_B &) > >The parentheses may not be required, my man page was for ksh on SGI, I >don't have it on my SuSE 8.2 box. YMMV & all that. Whilst this will work (although I have worked on systems where the parent process still hangs around), it's not very efficient... The parentheses create a new process which in turn creates a new process for script_B (because of the &). On some systems (e.g. cygwin on Windows), process creation carries a hefty price. Far better is to use the ksh builtin exec command which replaces the current process (i.e. "ksh script_A") with the new process (i.e. ksh script_B). So, instead of the above, just: exec script_B >From the ksh man page: exec [argument ...](1) If argument is given, the command specified by the arguments is executed in place of this shell without creating a new process. Input/output arguments can appear and affect the current process. HTH, 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 system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com **********************************************************************

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RE: [suse-programming-e] [Suse 8.0] Send a file attachment Using mutt in a shell script..
by Wenzel, Scott 17 May '05

17 May '05

The subject of the mutt command should be in quotes. Also it would be better if you included the full path name for "answer1". -----Original Message----- From: robert guru [mailto:sos_linux@hotmail.com] Sent: Tuesday, May 17, 2005 2:51 AM To: suse-programming-e(a)suse.com Subject: [suse-programming-e] [Suse 8.0] Send a file attachment Using mutt in a shell script.. hallo, I' m trying to create a shell script that search for some files named 'answer', and for each file founded, the shell script have to email it as an attachment using the 'mutt' program. My script is ############### the script #################### #!/bin/bash lancer="/usr/bin/mutt -x" for i in $(ls -p) do case $i in */) cd $i; pth=$PWD; for sname in $(ls) do case $sname in answer*) ii=`basename $i`; comm=$lancer" -s THE_RESULT -a "$sname" "$ii" < a_text_file"; echo $comm; result=`$comm`; esac done cd ..;; esac done ########## The result of the shell script ########### echo $comm: ---> /usr/bin/mutt -x -s THE_RESULT -a answer1 sos_linux(a)hotmail.com < a_text_file ( for this example, the file answer1 exists in /home/account/sos_linux(a)hotmail.com so here $ii is sos_linux(a)hotmail.com ) result=`$comm`: ---> deadlock, this command can not be completed,(in the case of ... "$ii" < a_text_file") ---> show the message "No recipients specified." in the case of ... "$ii" <a_text_file" (without space between '<' and 'a_text_file') ####################################### So what's the cure of this problem ? Thanks. _________________________________________________________________ Take charge with a pop-up guard built on patented Microsoft® SmartScreen Technology http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=htt p://hotmail.com/enca&HL=Market_MSNIS_Taglines Start enjoying all the benefits of MSN® Premium right now and get the first two months FREE*. -- To unsubscribe, email: suse-programming-e-unsubscribe(a)suse.com For additional commands, email: suse-programming-e-help(a)suse.com Archives can be found at: http://lists.suse.com/archive/suse-programming-e

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[Suse 8.0] Send a file attachment Using mutt in a shell script..
by robert guru 17 May '05

17 May '05

hallo, I' m trying to create a shell script that search for some files named 'answer', and for each file founded, the shell script have to email it as an attachment using the 'mutt' program. My script is ############### the script #################### #!/bin/bash lancer="/usr/bin/mutt -x" for i in $(ls -p) do case $i in */) cd $i; pth=$PWD; for sname in $(ls) do case $sname in answer*) ii=`basename $i`; comm=$lancer" -s THE_RESULT -a "$sname" "$ii" < a_text_file"; echo $comm; result=`$comm`; esac done cd ..;; esac done ########## The result of the shell script ########### echo $comm: ---> /usr/bin/mutt -x -s THE_RESULT -a answer1 sos_linux(a)hotmail.com < a_text_file ( for this example, the file answer1 exists in /home/account/sos_linux(a)hotmail.com so here $ii is sos_linux(a)hotmail.com ) result=`$comm`: ---> deadlock, this command can not be completed,(in the case of ... "$ii" < a_text_file") ---> show the message "No recipients specified." in the case of ... "$ii" <a_text_file" (without space between '<' and 'a_text_file') ####################################### So what's the cure of this problem ? Thanks. _________________________________________________________________ Take charge with a pop-up guard built on patented Microsoft® SmartScreen Technology http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=ht… Start enjoying all the benefits of MSN® Premium right now and get the first two months FREE*.

2 1

Simple question about shell scripting on SuSE 8.0
by robert guru 17 May '05

17 May '05

Hallo, I m a shell scripting newbie, and i m trying to create a shell script that search for some files named 'script', those files are located in the subdirectory of a directory named "folder", and for each file founded, i have to show the directory (full path) where the file was founded and pipe the file to some program. the script must be something like that: for each file found in the subdirectory tree of "folder" do "show the full path where the file was found, without the file name, like /root/folder/images" enter this directory already showed ($cd directory) "pipe the file to a program" done Thanks for help!! _________________________________________________________________ Scan and help eliminate destructive viruses from your inbound and outbound e-mail and attachments. http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=ht… Start enjoying all the benefits of MSN® Premium right now and get the first two months FREE*.

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call a script in a script
by Patrick B. O'Brien 17 May '05

17 May '05

Using ksh. I want to call script_B from script_A. I don't not want script_A to hang around for script_B to finish. I tried bg but no joy. Script_A sits and waits for script_B to finish before moving on; which is no good. Any thoughts and thank you.

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openSUSE Programming May 2005