Linux-Development-Apps Digest #326, Volume #7 Tue, 10 Apr 01 20:13:08 EDT
Contents:
Re: How to detect memory leaks ? ("Hubert")
Re: Call To Action: Help me help others. (Jan Atle Ramsli)
Re: gcc -ansi option and signals (Raymond Toy)
Re: "Linux" Float Point Verification (Raymond Toy)
Re: gcc -ansi option and signals (Erik Max Francis)
Re: Small Text-based UI Lib for Linux (Dave Blake)
Re: Urgent!!! gdm killed mysteriously? (Dave Blake)
Installing Linux applications.... !! ("Karim A")
Copy-paste operations in X ("Philip Van Hoof")
Re: Small Text-based UI Lib for Linux (Grant Edwards)
Re: alternatives to 'xfig'? (Scott Johnston)
Re: alternatives to 'xfig'? (Grant Edwards)
UML (Charles Herman)
Re: Installing Linux applications.... !!
Re: alternatives to 'xfig'? (Dave Blake)
Re: Win Modems ("Alex Collins")
Re: Copy-paste operations in X ("Philip Van Hoof")
----------------------------------------------------------------------------
From: "Hubert" <[EMAIL PROTECTED]>
Subject: Re: How to detect memory leaks ?
Date: Tue, 10 Apr 2001 17:09:32 +0200
"Chris" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]...
> Hubert wrote:
> >
> > I am looking for a tool that helps me detecting memory problems like
memory
> > leaks.
> > Can anybody recommand a tool or library for Linux and C++?
>
> Others will point you at various ways to do this, I
> expect, but there is a simple C++ approach using macros
> and placement new: (note that this code is not very
> tested ;) )
>
Chris,
That's a good idea, thank you! I will try this out.
Regards
Hubert
------------------------------
Date: Tue, 10 Apr 2001 18:28:29 +0200
From: Jan Atle Ramsli <[EMAIL PROTECTED]>
Subject: Re: Call To Action: Help me help others.
Chris Falch wrote:
> I see your point. I'll keep it in mind in the future, but the goal was for
> this post to reach as many sets of eyeballs as possible.
Well, I am one who sees yours!
There is a need for improvement for programmers who are used to pressing
[F1] on whatever the cursor is on and instantly get to know everything
there is to know about whatever the cursor was on.
I wanted to join an XML-related project, but realized it was not about
improving the man-pages.
I guess the man pages date back to when 'libc' was the entire lib, or
just about, and whatever else was 'commands'.
My first Unix-like system was Xenix-286, that one ran on 1Mb Ram (@Mb
recommended) and 30Mb harddisk, so it was about the size as DOS would
have been, had it been ported to the 286 or 386.
I guess the whole thing needs to be studied first: It is obvious what
'help' means in such a small system, but what about now?
Help must become context sensitive in a new way - it must know what
'kind' of help you are most likely to want.
If you are editing a C-file and press [F1] - the biggest chance is that
you want help as mentioned above.
If you are editing a HTML-file, you want to know about HTML, and so on.
Each library should have a companion help file, so when you include the
library in your project (or should the Makefile or autoconf-files be
parsed?) - hitting [F1] will include that help file in the top level
hierarchy.
... is this somewhere along the lines you were thinking?
Atle
------------------------------
From: Raymond Toy <[EMAIL PROTECTED]>
Subject: Re: gcc -ansi option and signals
Date: 10 Apr 2001 11:45:57 -0400
>>>>> "Erik" == Erik Max Francis <[EMAIL PROTECTED]> writes:
Erik> Neoklis wrote:
>> When I use the -ansi option with gcc, I get error messages relating to
>> variables and functions I use for signal handling, e.g. with:
Erik> ...
>> struct sigaction sa_new, etc;
Erik> ...
>> I get messages like ..storage size of sa_new not known.. and
>> ..implicit declaration of function sigaction..
>>
>> Without the -ansi option the source compiles and runs with no
>> problems.
>> Am I to presume that this type of signal handling is not compatible
>> with ansi C or perhaps there is a problem with header files?
Erik> The former. sigaction is POSIX, but not ANSI C.
What makes it not compilable in ANSI C?
Ray
------------------------------
From: Raymond Toy <[EMAIL PROTECTED]>
Subject: Re: "Linux" Float Point Verification
Date: 10 Apr 2001 11:46:58 -0400
>>>>> "Albert" == Albert Herman <[EMAIL PROTECTED]> writes:
Albert> My companies management is more than a bit nervous about using Linux for
Albert> floating point computational purposes. I'm working to mitigate their
Albert> concerns. I plan to port to Solaris/Sparc (know about SparcIII problems)
to
What Sparc III problems are you talking about here?
I'm curious.
Ray
------------------------------
From: Erik Max Francis <[EMAIL PROTECTED]>
Subject: Re: gcc -ansi option and signals
Date: Tue, 10 Apr 2001 09:08:43 -0700
Raymond Toy wrote:
> Erik> The former. sigaction is POSIX, but not ANSI C.
>
> What makes it not compilable in ANSI C?
Because sigaction is not defined by ANSI C. The ANSI C signal mechanism
is the old POSIX signal.
--
Erik Max Francis / [EMAIL PROTECTED] / http://www.alcyone.com/max/
__ San Jose, CA, US / 37 20 N 121 53 W / ICQ16063900 / &tSftDotIotE
/ \ The public is a fool.
\__/ Alexander Pope
Erik Max Francis' bookmarks / http://www.alcyone.com/max/links/
A highly categorized list of Web links.
------------------------------
From: [EMAIL PROTECTED] (Dave Blake)
Subject: Re: Small Text-based UI Lib for Linux
Date: 10 Apr 2001 17:33:14 GMT
Reply-To: [EMAIL PROTECTED]
Grant Edwards <[EMAIL PROTECTED]> wrote:
> Dave Blake wrote:
> >Termcap is the smallest. Some older vi versions use it, and
> >microemacs uses it (see
> >http://www.kernel.org/pub/linux/kernel/uemacs/)
>
> I don't think I'd consider termcap a "user interface" library
> comprable to slang/newt or curses/cdk. The former only
> provide very low level API to move the cursor around and
> suchlike. The latter provide high-level widgets like menus,
> radio-buttons, trees, text-entry, etc. Termcap (for example)
> would be the layer below curses, not an alternative to curses
> -- and certainly not an alternative to the next layer up such
> as cdk.
Of course.
-rwxr-xr-x 1 root root 15129 Aug 16 1999 /lib/libtermcap.so.2.0.8
-rwxr-xr-x 1 root root 269580 Apr 6 1999 /usr/lib/libncurses.so.4.2
-rw-r--r-- 1 root root 402490 Aug 21 2000 /usr/lib/libslang.so.1.4.2
-rwxr-xr-x 1 root root 53447 Apr 9 1999 /usr/lib/libnewt.so.0.40
ldd /usr/lib/libnewt.so.0.40
libslang.so.1 => /usr/lib/libslang.so.1 (0x40017000)
libm.so.6 => /lib/libm.so.6 (0x40077000)
libc.so.6 => /lib/libc.so.6 (0x40094000)
libdl.so.2 => /lib/libdl.so.2 (0x40189000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x2aaaa000)
======================================================
Termcap provides a reasonable user inferface for simple things
of the sort one would expect from a very stripped down
distribution.
It is 15k, compared with
ncurses: 269k
slang: 402k
newt: 402k + 53k = 455k
I gave as an example microemacs, which can do nearly all the
text editing functions of emacs, but is under 100k in size,
plus the dynamic link to termcap.
If I recall correctly, the original post queried about a
console user interface library suitable for a tiny distribution
like a root/boot disk. Termcap is the only thing that fits the
bill.
I also question your assertion that termcap is a layer underneath
ncurses or slang. Both slang and ncurses are enlightened enough
to use the terminfo interface for terminal info. Termcap parses
the text file /etc/termcap, and is much less robust.
The original post also asked about C++ libs.
If I had to choose one to program, I have experience with
termcap and ncurses, and I find ncurses to be quite nice for
programming. Slang is supposed to be similarly nice. However,
if size was VERY important, I would choose termcap.
--
Dave Blake
[EMAIL PROTECTED]
------------------------------
From: [EMAIL PROTECTED] (Dave Blake)
Subject: Re: Urgent!!! gdm killed mysteriously?
Date: 10 Apr 2001 17:36:02 GMT
Reply-To: [EMAIL PROTECTED]
Crystal Luo <[EMAIL PROTECTED]> wrote:
> Dear Eric,
>
> Forgive my ignorance, I am a beginner. How to boot into single
> user mode and disable gdm? Thank you so much.
To disable gdm on a redhat system, do the following.
1. Edit /etc/inittab
Delete the last line,
x:5:respawn:/etc/X11/prefdm -nodaemon
2. cd /etc/rc.d/
ls -l rc[23456].d/S*gdm
rm rc[23456].d/S*gdm
Then fix X manually, and re-enable gdm once finished.
--
Dave Blake
[EMAIL PROTECTED]
------------------------------
From: "Karim A" <[EMAIL PROTECTED]>
Subject: Installing Linux applications.... !!
Date: Tue, 10 Apr 2001 21:38:16 +0200
Hi all,
I've developped an application for Linux under Gnome env.
Now I'd like to provide users a script to install it.
But I'm not "very" experienced with scripting.
I've always developped under Windwos and I don't know if it exist install
tools for
Linux such like InstallShield.
In fact, I'd like to know how to set permanently env variables in .xxxRC
files.
I alwas get permissions errors etc.
So, does anyone knows where I can find tutorials about writing install
scripts, setting up env variables etc...
Thanks a lot.
Regards,
Karim
------------------------------
From: "Philip Van Hoof" <[EMAIL PROTECTED]>
Subject: Copy-paste operations in X
Reply-To: [EMAIL PROTECTED]
Date: Tue, 10 Apr 2001 20:03:14 GMT
Hi there,
I am trying to make an application that needs the
information that is in the copypaste buffer of X
(the selection). Using the examples of this little
document I can already do all this but only using
pure X apps. So not when the app uses gtk or KDE
libraries.. Also browsers like netscape and mozilla
dont work with these examples..
--> http://www.enfin.com/getweb/X-copy+paste.txt
So, These examples will printf() the selected text..
but only when it's a pure X application like xterm.
My question..
Is there a general way.. a solution that can works
with all Windowmanagers.. Or what are the solutions
for Gtk clients? What for KDE ? This is all so
confusing.. why isn't there a standard defined for
this? If this is where Linux/unix/posix development
is heading to.. then we are all doomed since not ONE
single desktop programmer wants to learn
specifications for ALL managers and librabries..
However.. I belive that there is a solution for this
since all gtk and kde applications/objects can get the
selection (copypaste buffer) from other applications.
Only..it seems to be that the code to do this is
hidden somewhere in the gtk and qt libs .. and noway
that I am planning to dig out 100 000 rules of code
in gtk+ just to know how to do this manually :-(
My primary target is to 'get' the selected text.
Once that works I also want to 'set' the buffer..
I think this can't be hard because you can 'select'
text in objects like the gtk_entry and gtk_text...
Well I think you can.. again "hidden" and hard to
find documentation about this... :(
--
Philip van Hoof aka freax (http://www.freax.eu.org)
irc: irc.openprojects.net mailto:freax @ pandora.be
------------------------------
From: [EMAIL PROTECTED] (Grant Edwards)
Subject: Re: Small Text-based UI Lib for Linux
Date: Tue, 10 Apr 2001 20:23:02 GMT
In article <[EMAIL PROTECTED]>, Dave Blake wrote:
>> >Termcap is the smallest. Some older vi versions use it, and
>> >microemacs uses it (see
>> >http://www.kernel.org/pub/linux/kernel/uemacs/)
>>
>> I don't think I'd consider termcap a "user interface" library
>> comprable to slang/newt or curses/cdk. The former only provide
>> very low level API to move the cursor around and suchlike. The
>> latter provide high-level widgets like menus, radio-buttons,
>> trees, text-entry, etc. Termcap (for example) would be the
>> layer below curses, not an alternative to curses -- and
>> certainly not an alternative to the next layer up such as cdk.
>
>Of course.
>Termcap provides a reasonable user inferface for simple things
>of the sort one would expect from a very stripped down
>distribution.
>
>It is 15k, compared with
>ncurses: 269k
I still don't think comparing ncurses with termcap is a
meaningful thing to do. ncurses provides a complete windowing
environment. Termcap just lets you manipulate the terminal at
the lowest level. The OP asked for a user-interface library.
Providing a function to move the cursor and clear the screen
doesn't really compare with providing windows and widgets.
If all you have room for is termcap, then that's what you have
to use, but you'll have to write your widgets from scratch.
--
Grant Edwards grante Yow! HUMAN REPLICAS are
at inserted into VATS of
visi.com NUTRITIONAL YEAST...
------------------------------
From: Scott Johnston <[EMAIL PROTECTED]>
Subject: Re: alternatives to 'xfig'?
Date: Wed, 11 Apr 2001 03:53:29 -0700
[EMAIL PROTECTED] wrote:
> hi
>
> i was wondering if there are any
> alternatives to 'xfig' under linux
> that will let me draw stuff?
>
> thanks.
Check out the vector graphic editors at
http://sourceforge.net/foundry/vectorgraphics
Scott Johnston
------------------------------
From: [EMAIL PROTECTED] (Grant Edwards)
Subject: Re: alternatives to 'xfig'?
Date: Tue, 10 Apr 2001 20:54:34 GMT
In article <99dhvn$jql$[EMAIL PROTECTED]>, [EMAIL PROTECTED] wrote:
>i was wondering if there are any
>alternatives to 'xfig' under linux
>that will let me draw stuff?
I switched from xfig to sketch:
http://sketch.sourceforge.net/
--
Grant Edwards grante Yow! Are we live or
at on tape?
visi.com
------------------------------
From: Charles Herman <[EMAIL PROTECTED]>
Subject: UML
Date: 10 Apr 2001 21:12:07 GMT
What are the UML tools available for Linux. Along with a list of the
tools, I am looking for a description of the pros and cons of each tool.
All information will be mightily appreciated.
-charles
------------------------------
From: [EMAIL PROTECTED] ()
Crossposted-To: comp.os.linux.development.system
Subject: Re: Installing Linux applications.... !!
Date: Tue, 10 Apr 2001 22:05:30 -0000
In article <9avnma$1qq$[EMAIL PROTECTED]>, Karim A <[EMAIL PROTECTED]> wrote:
>I've developped an application for Linux under Gnome env.
>Now I'd like to provide users a script to install it.
>But I'm not "very" experienced with scripting.
>I've always developped under Windwos and I don't know if it exist install
>tools for Linux such like InstallShield.
>
>In fact, I'd like to know how to set permanently env variables in .xxxRC
>files. I alwas get permissions errors etc.
>
>So, does anyone knows where I can find tutorials about writing install
>scripts, setting up env variables etc...
A good place to start would be the rpm howto document.
--
http://www.spinics.net/linux/
------------------------------
From: [EMAIL PROTECTED] (Dave Blake)
Subject: Re: alternatives to 'xfig'?
Date: 10 Apr 2001 21:52:25 GMT
Reply-To: [EMAIL PROTECTED]
Scott Johnston <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] wrote:
>
> > hi
> >
> > i was wondering if there are any
> > alternatives to 'xfig' under linux
> > that will let me draw stuff?
> >
> > thanks.
>
> Check out the vector graphic editors at
> http://sourceforge.net/foundry/vectorgraphics
Postscript is a VERY easy language in which to
program graphics.
I am always STUNNED that people would rather use
a primitive inflexible interface for drawing instead of
completely specifying the graphics in postscript.
But, to each his own, I guess.
--
Dave Blake
[EMAIL PROTECTED]
------------------------------
From: "Alex Collins" <[EMAIL PROTECTED]>
Subject: Re: Win Modems
Date: Wed, 11 Apr 2001 00:24:48 +0100
I dont know why you seem to have such problems with lucent based
win-modems... mine works just dandy on a P75 and has a connection up without
probs for the entire 2hrs allowed by my isp... and i d/l over 800M / mo on
it... and all this whilst acting as a proxy, and router...
"Michael Meissner" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]...
> Johan Kullstam <[EMAIL PROTECTED]> writes:
>
> > "LittleFish" <littlefish_au[SPAM ME AT YOUR OWN RISK]@yahoo.com> writes:
> >
> > > It seems as if more and more people using Windows
> > > are very dissapointed over the performance of there Lucent Winmodems.
In the
> > > last week I have met 3 people that have taken back there Lucent
Winmodem
> > > because it drops out regularly. If your machine is slower 300Mhz or is
> > > running a CPU intensive task in the background you can bet that it
will drop
> > > out. Give me a real modem anyday!! By the way real internal modems are
> > > getting hard to source. Does anyone have suggestions for a Internal
Fax
> > > Voice Data modem?
> >
> > one word _EXTERNAL_. yes, i know you said internal but why not expand
> > your possibilities? since most mice these days are ps/2 or usb, you
> > probably have nothing on your rs232 ports. why not use it?
>
> Some machines don't have serial ports. Some of us already have too many
other
> things on our serial ports (on my system, I have a ups, an X-10
controller, a
> Palm hot-sync cradle, and the embedded board I'm currently testing).
>
> --
> Michael Meissner, Red Hat, Inc. (GCC group)
> PMB 198, 174 Littleton Road #3, Westford, Massachusetts 01886, USA
> Work: [EMAIL PROTECTED] phone: +1 978-486-9304
> Non-work: [EMAIL PROTECTED] fax: +1 978-692-4482
------------------------------
From: "Philip Van Hoof" <[EMAIL PROTECTED]>
Subject: Re: Copy-paste operations in X
Reply-To: [EMAIL PROTECTED]
Date: Tue, 10 Apr 2001 23:51:36 GMT
This is some information that I've found myself
so far I havn't got it working..
http://developer.gnome.org/doc/API/gtk/gtk-selections.html
http://developer.gnome.org/doc/API/2.0/gtk/gtk-clipboards.html
Using this
....
GtkClipboard *clipb;
clipb = gtk_clipboard_get(GDK_NONE); /* GDK_SELECTION_PRIMARY */
g_warning("text %s", gtk_clipboard_wait_for_text(clipb));
....
I get
[root@freax src]# make
gcc -DDEBUG -DHAVE_CONFIG_H -I. -I. -I.. -I../intl -I/usr/lib/glib/include
-I/usr/X11R6/include -g -O2 -Wall -c callbacks.c
In file included from callbacks.c:11:
netcode.c: In function `get_string':
netcode.c:29: warning: function returns address of local variable
callbacks.c: In function `on_button_set_clicked':
callbacks.c:21: `GtkClipboard' undeclared (first use in this function)
callbacks.c:21: (Each undeclared identifier is reported only once
callbacks.c:21: for each function it appears in.)
callbacks.c:21: `clip' undeclared (first use in this function)
callbacks.c:21: warning: statement with no effect
callbacks.c:42: `clipb' undeclared (first use in this function)
callbacks.c:42: warning: implicit declaration of function `gtk_clipboard_get'
callbacks.c:43: warning: implicit declaration of function `gtk_clipboard_wait_for_text'
callbacks.c:43: warning: format argument is not a pointer (arg 4)
callbacks.c:20: warning: unused variable `selection'
make: *** [callbacks.o] Error 1
[root@freax src]#
btw .. I am indeed using glade.. and I am calling this code
in a file which contains
#include <gtk/gtk.h>
in a function called
void
on_button_set_clicked (GtkButton *button,
gpointer user_data)
{
...
}
The application compiled (without this code of course) and it's
a working gtk application. So yes :) I did not forget includes
and etc etc..
--
Philip van Hoof aka freax (http://www.freax.eu.org)
irc: irc.openprojects.net mailto:freax @ pandora.be
------------------------------
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