Linux-Development-Sys Digest #578, Volume #8 Tue, 20 Mar 01 04:13:15 EST
Contents:
Re: System function interrupts ("Joseph A. Knapka")
Re: Kernel Panic!! (Help!!!!) (David)
Re: copy_to_user() question
ipx sockets under linux (=?iso-8859-1?Q?J=F6rg?= Rieling)
Reccomend a good C lib for queue, stack, linklists... (Pjtg0707)
Re: ipx sockets under linux
Re: copy_to_user() question (Kevin Buhr)
Re: Reccomend a good C lib for queue, stack, linklists... (John Kelly)
File system driver questions. (Dennis Jenkins)
request_irq RTC ... how does it work? (Eric van der Velde)
Re: Reccomend a good C lib for queue, stack, linklists... (Philip Armstrong)
Re: Using bzdisk as a boot disk question. (Jerry Peters)
Anyone know about Aureal Semiconductor? (Shekhar Patkar)
Re: Anyone know about Aureal Semiconductor? ("Ethan M. Schwartz")
Writing a Device Driver (David Findlay)
Re: TCP implemenation changes ("alberto")
Re: SegFault (John Kelly)
can any one suggest the editor for linux,other than vi, which is similar to Editor
for Windows..... ("v.nagasrinivas")
----------------------------------------------------------------------------
From: "Joseph A. Knapka" <[EMAIL PROTECTED]>
Subject: Re: System function interrupts
Date: Mon, 19 Mar 2001 14:51:08 GMT
Andrzej Stypula wrote:
>
> "Joseph A. Knapka" wrote:
> >
> > Andrzej Stypula wrote:
> > >
> > > Hi everyone,
> > > I have a little problem in below situation.
> > > lets consider an example code (standard handler for SIGALRM - return):
> > >
> > > _Time(timelimit);
> > > err=any_system_function_in_blocking_mode(...);
> > > _Time(0);
> > >
> > > the 'timelimit' is about 10 - 50 ms.
> > >
> > > the thread or process has slept by scheduler after doing the
> > > _Time() but before any_system... (is possible?)
> > >
> > > After timelimit proces got SIGALRM, but process which is running now
> > > has hihgher priority, so my process sleep longer.
> > > Now, the Q:
> > > the any_system... returns with EINTR or my process would be sleep
> > > forever?
> >
> > The next time your process is chosen by the scheduler, the kernel
> > will deliver the SIGALRM. You will definitely not sleep forever
> > - in fact you don't sleep at all. Being evicted from the CPU due
> > to another process being scheduled is -not- the same as sleeping.
> > If another process is scheduled, your process is still in the
> > "runnable" state, not the "sleeping" state.
>
> As I well anderstand you, the 'any_system_fuction_in_bloking...'
> always returns with EINTR error if the timelimit will be too short.
> So,I have not to use any extra magic code to prevent process (thread)
> for deadlock.
Yes, correct.
-- Joe Knapka
"It was just a maddened crocodile hidden in a flower bed. It could
have happened to anyone." -- Pratchett
// Linux MM Documentation in progress:
// http://home.earthlink.net/~jknapka/linux-mm/vmoutline.html
* Evolution is an "unproven theory" in the same sense that gravity is. *
------------------------------
From: David <[EMAIL PROTECTED]>
Subject: Re: Kernel Panic!! (Help!!!!)
Date: Mon, 19 Mar 2001 18:31:18 -0000
Thanks to all who answered. I found that when I recompiled the kernel for the
reiserfs, I did a very "newbie" thing and forgot to load my config file from the past
compile. Though it was set to recognize ext2 filesystems, there were a few other
things it WASN'T set to do, hence my problems. A few quick clicks of the mouse and a
recompile fixed it!
David
David wrote:
>
> I recently downloaded the 2.2.18 kernel from kernel.org. I compiled it and installed
>it on my Debian 2.2 (Potato) system. I configured and ran lilo (I'm no newbie at
>these things). I tried it and it worked well for a few days.
>
> I have a dual boot (Win98 SE) system and one day I booted Windows to play flight
>simulator. During the boot, Norton reported that my MBR had been changed and asked if
>I wanted it (Norton) to repair it. Without thinking, I hit "yes". Probably a dumb
>thing to do.
>
> Later, I decided that I wanted to try the reiserfs so I downloaded the patch for me
>spanking new kernel. Yes, I'm sure I got the right patch. I applied it and
>recompiled. Reinstalled lilo. Tried to reboot the new kernel. The new image
>uncompressed and started booting, then I got:
>
> VFS: Cannot open root device 03:03
> Kernel panic: VFS : Unable to mount root fs on 03:03
>
> So I rebooted with the old kernel (still worked!) and messed around a bit with
>lilo's settings. Reran lilo. Still no dice. COMPLETELY changed my lilo settings to
>the point where I would notice the changes at the lilo prompt. Reran lilo. WAIT A
>MINUTE!! Nothing changed at the lilo prompt as it should have! Something flaky going
>on here! Reran lilo again. Still no expected changes!
>
> Decided to install grub. Did so successfully. New kernel now gives me the the same
>error messages except it substitutes 00:00 for the 03:03's.
>
> What the heck can I do to get me new kernel to work again? I'm still using ext2 and
>yes, ext2 is switched on in the kernel (not as a module).
>
> Help!!
>
> David
>
>
> --
> Posted via CNET Help.com
> http://www.help.com/
--
Posted via CNET Help.com
http://www.help.com/
------------------------------
From: [EMAIL PROTECTED] ()
Subject: Re: copy_to_user() question
Date: Mon, 19 Mar 2001 19:04:56 -0000
In article <991fjd$ias$[EMAIL PROTECTED]>,
Jim Fischer <[EMAIL PROTECTED]> wrote:
>> >So what am I missing here? Tks...
>>
>> Where does the value of "len" get set?
>len's value is set in the validation and range check code, just before the
>for() loop / copy_to_user() call. For the sake of argument, choose len's
>value as 23 bytes (the length of some arbitrary text string (22) plus its
>NUL termination char '\0'). Note that the value that's stored in len is
>exactly the same for both the for() loop version (i.e., the put_user()
>version) and the copy_to_user() version.
For the sake of debugging how about printing the value out just
before the copy_to_user() call.
--
http://www.spinics.net/linux/
------------------------------
From: =?iso-8859-1?Q?J=F6rg?= Rieling <[EMAIL PROTECTED]>
Subject: ipx sockets under linux
Date: Mon, 19 Mar 2001 20:06:14 +0100
Reply-To: [EMAIL PROTECTED]
hi all,
i want to program an ipx socket application under linux (kernel
2.1.x). it seems that ipx sockets behave slightly different from
standard tcp/ip sockets... can anyone tell me how to set up the
classical server program ('accept'-ing connections) and the classical
client program ('connect'-ing) ? a few lines of code or pseudo-code
would be sufficient.
(YES, ipx is in my kernel and i have ipx.h in my lib search path).
thanks in advance!
j�rg.
------------------------------
From: [EMAIL PROTECTED] (Pjtg0707)
Subject: Reccomend a good C lib for queue, stack, linklists...
Date: Mon, 19 Mar 2001 19:10:45 -0000
Reply-To: [EMAIL PROTECTED]
... don't feel like writing my own lib right now.
I am looking for a good C lib for queues, stacks, linklists etc
.
So far, I've tried Pingutil from freshmeat, and it has some real
problems compiling on Linux.
------------------------------
From: [EMAIL PROTECTED] ()
Subject: Re: ipx sockets under linux
Date: Mon, 19 Mar 2001 19:18:05 -0000
In article <[EMAIL PROTECTED]>,
J�rg Rieling <[EMAIL PROTECTED]> wrote:
> i want to program an ipx socket application under linux (kernel
> 2.1.x). it seems that ipx sockets behave slightly different from
> standard tcp/ip sockets... can anyone tell me how to set up the
> classical server program ('accept'-ing connections) and the classical
> client program ('connect'-ing) ? a few lines of code or pseudo-code
> would be sufficient.
> (YES, ipx is in my kernel and i have ipx.h in my lib search path).
IPX doesn't have connections. Think of it as being like UDP. If you
really want connections like TCP, use SPX.
--
http://www.spinics.net/linux
------------------------------
From: [EMAIL PROTECTED] (Kevin Buhr)
Subject: Re: copy_to_user() question
Date: 19 Mar 2001 14:11:09 -0600
"Jim Fischer" <[EMAIL PROTECTED]> writes:
>
> I'm a newby kernel hacker who's unable to get the copy_to_user() function to
> write data from kernel space to user space.
Actually, it *did* work. You just checked for the wrong failure
condition.
The "copy_to_user()" function returns the amount of *uncopied* data
remaining when an illegal address is encountered. That is, it returns
zero if the copy is successful, as it is in your example.
You could replace your "return i;" line with:
return len - i; /* return number of bytes copied */
However, it makes more sense to return -EFAULT whenever copy_to_user
fails to copy all the data:
if (copy_to_user(ubuf, kbuf, len))
return -EFAULT;
return len; /* len bytes successfully copied! hooray! */
If you grep the kernel for "copy_to_user", you'll see that this second
idiom is the one used almost everywhere.
Kevin <[EMAIL PROTECTED]>
------------------------------
From: John Kelly <[EMAIL PROTECTED]>
Subject: Re: Reccomend a good C lib for queue, stack, linklists...
Date: Mon, 19 Mar 2001 13:43:27 -0700
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Pjtg0707 wrote:
> ... don't feel like writing my own lib right now.
> I am looking for a good C lib for queues, stacks, linklists etc
> .
How about glib from http://www.gtk.org ? It's already availible on your
system ( if you're running RedHat, at least ).
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------------------------------
From: Dennis Jenkins <[EMAIL PROTECTED]>
Subject: File system driver questions.
Date: Mon, 19 Mar 2001 14:57:22 -0600
I wish to write a file system driver for the Apple II ProDOS file
system. I have the full specs on the file system, and I can write
userland tools to copy files in/out of ProDOS disk images. I'm fairly
good at c/c++/asm. However, the Linux kernel source code for file
system drivers seems... a bit... dense. I have no idea how where to
start. I want to write this thing incrementally, instead of writing it
all at once, only to discover that it does not work. Where are the
online resources that would help me?
I have read the source to the ROMFS driver and parts of the HFS
driver. In my first attempt, I hacked the hell out of the ROMFS
driver. I could register the prodos filesystem driver, but non of the
operations worked. Hell, they weren't even implemented, b/c I had no
idea where to start!
Thanks,
--
[EMAIL PROTECTED] Universal Savings Bank.
The three most dangerous things are a programmer with a soldering
iron, a manager who codes, and a user who gets ideas.
------------------------------
From: Eric van der Velde <[EMAIL PROTECTED]>
Subject: request_irq RTC ... how does it work?
Date: Mon, 19 Mar 2001 22:33:28 +0100
Hello,
I am having trouble to request an IRQ on the RTC. From a device I open
/dev/rtc (using filp_open) and set the the RTC using ioctl the generate
interrupts. (set the rate and enable the periodic interrupts)
The call request_irq call fails (-16). When I do a free_irq before the
request_irq, it works, but then I cannot get an interrupt frequency
higher than 64 Hz.
Question is how do I receive RTC interrupts within a module?
I think I should use the poll function on /dev/rtc, but how?
Regards Eric.
------------------------------
From: [EMAIL PROTECTED] (Philip Armstrong)
Subject: Re: Reccomend a good C lib for queue, stack, linklists...
Date: 19 Mar 2001 20:02:19 -0000
In article <[EMAIL PROTECTED]>,
Pjtg0707 <[EMAIL PROTECTED]> wrote:
>
>... don't feel like writing my own lib right now.
>I am looking for a good C lib for queues, stacks, linklists etc
>.
>
>So far, I've tried Pingutil from freshmeat, and it has some real
>problems compiling on Linux.
>
glib is one such (The base util library used by gtk+).
Phil
--
http://www.kantaka.co.uk/ .oOo. public key: http://www.kantaka.co.uk/gpg.txt
------------------------------
From: Jerry Peters <[EMAIL PROTECTED]>
Subject: Re: Using bzdisk as a boot disk question.
Date: Mon, 19 Mar 2001 22:12:17 GMT
John Kelly <[EMAIL PROTECTED]> wrote:
> ImperatorM wrote:
>> I have made a boot disk with make bzdisk but it won't boot because I need to
>> tell it where root is. How do I do this?
> rdev /dev/fd0 /dev/hda(root partition)
>> Also, is using a disk made this way
>> a good way to boot regularly? Everything I read reffers to using bzdisk to
>> test a kernel, I use a LILO disk now so is there really any difference? Thanks
> I use lilo to boot regularly because it's faster, but it's good to have a boot
> disk when you're testing a new kernel, in case you overwrite your only working
> kernel, or forget to run lilo.
> Typically, I make a boot disk just before embarking on those adventures.
> (mkbootdisk on a RH system)
>>
>> -Ted
Even better, copy you new kernel to a different name or directory, add
a section to LILO to describe it, run /sbin/lilo and reboot, selecting
your old or your new kernel.
Jerry
------------------------------
From: Shekhar Patkar <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.misc
Subject: Anyone know about Aureal Semiconductor?
Date: Mon, 19 Mar 2001 16:29:22 -0800
Hi,
Does anyone know what happened to Aureal Semiconductor? I
have an A3D card in my system, and the driver doesn't work
with kernel 2.4.2. I'm trying to fix it and have some problems,
but when I try to look for their web site, it looks like the
company has disappeared!
Would appreciate any pointers ...
Thanks,
Shekhar
------------------------------
From: "Ethan M. Schwartz" <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.misc
Subject: Re: Anyone know about Aureal Semiconductor?
Date: Mon, 19 Mar 2001 19:32:50 -0500
they went out of business a while ago...
"Shekhar Patkar" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]...
> Hi,
>
> Does anyone know what happened to Aureal Semiconductor? I
> have an A3D card in my system, and the driver doesn't work
> with kernel 2.4.2. I'm trying to fix it and have some problems,
> but when I try to look for their web site, it looks like the
> company has disappeared!
>
> Would appreciate any pointers ...
> Thanks,
> Shekhar
------------------------------
From: David Findlay <[EMAIL PROTECTED]>
Subject: Writing a Device Driver
Reply-To: [EMAIL PROTECTED]
Date: Tue, 20 Mar 2001 12:47:21 +1000
I have email conexant telling them that I would like to write a Linux
driver for the conexant HCF(controllerless) chipset for modems. I told them
I would be writing it under the gnu public license for hopeful inclusion in
the Linux kernel, and asked for a device driver kit to be emailed to me.
What do you reckon my chances of getting the information I need are? Thanks,
David
------------------------------
From: "alberto" <[EMAIL PROTECTED]>
Subject: Re: TCP implemenation changes
Date: Tue, 20 Mar 2001 04:06:17 +0100
"Lionel" <[EMAIL PROTECTED]> ha scritto nel messaggio
news:[EMAIL PROTECTED]...
> Hi,
>
> I'm planning to make some changes to my TCP implementation, but I don't
> know what is the best kernel version to start with.
> I have 2.2.18 and 2.4.
>
> Where they some major changes in the TCP implementation between these
> two versions ? Is the TCP implementation of 2.4. stable enough to be a
> good place to start, or better start with 2.2.18 implementation ???
>
> I know that I can download both and make a diff between the TCP source
> files but this won't probably give me a real answer to my question.
>
> Thanks in advance for help.
>
> Lionel
>
maybe you will find more docs about 2.2.18
bye
------------------------------
From: John Kelly <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
Subject: Re: SegFault
Date: Mon, 19 Mar 2001 21:09:02 -0700
Can you compile with a -g flag, and run it in from gdb?
-jk
Unknown wrote:
> In article <[EMAIL PROTECTED]>, "Kasper Dupont"
> <[EMAIL PROTECTED]> wrote:
>
> > Unknown wrote:
> >>
> >> After compiling bladeenc (mp3 encoding), i always got Segmentation
> >> fault. It's a debian sid dist, with a DURON on a asus motherboard it's
> >> perhaps a floating point error ! Could anyone help?
> >
> > Is it the compiler or the produced executable that fails? Do you get a
> > core dump?
> >
> it's the produced binary that fails, i've tried also with notlame source
> and it fails also. no i dont'get any core file generated.
> does it came from the hardware ?
> the system is ok ( xfree 4.0.2, kernel 2.4.2 etc....)
------------------------------
From: [EMAIL PROTECTED] ("v.nagasrinivas")
Subject: can any one suggest the editor for linux,other than vi, which is similar to
Editor for Windows.....
Date: Tue, 20 Mar 2001 09:02:17 +0000 (UTC)
This is a multi-part message in MIME format.
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Hi ,
=20
Can any body suggest the editor for linux, which is similar to =
Editor for windows..(www.gensoft.com).
Because through the code reading ( means searching through several files =
at a time and other things are very easy..)
thanks in advance,
srinivas.
v.naga srinivas
YVL Software Consultancy
B4,Q1,6th floor,Hi-Tec city,
CyberTowers, Madhapur,
Hyderabad - 500033
Andhra Pradesh
INDIA
phone : 091-040-3110200(off)
091-040-3810616(res)
visit me: www.geocities.com/cheluvi
=======_NextPart_000_0013_01C0B14B.28418520
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
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<META content=3D"MSHTML 5.00.2314.1000" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>
<DIV><FONT face=3DArial size=3D2>Hi ,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial =
size=3D2> Can any=20
body suggest the editor for linux, which is similar to Editor for =
windows..(<A=20
href=3D"http://www.gensoft.com">www.gensoft.com</A>).</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Because through the code reading ( =
means searching=20
through several files at a time and other things are very =
easy..)</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>thanks in advance,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>srinivas.</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>v.naga srinivas<BR>YVL Software=20
Consultancy<BR>B4,Q1,6th floor,Hi-Tec city,<BR>CyberTowers,=20
Madhapur,<BR>Hyderabad - 500033<BR>Andhra Pradesh<BR>INDIA<BR>phone :=20
091-040-3110200(off)<BR> &=
nbsp; =20
091-040-3810616(res)<BR>visit me: <A=20
href=3D"http://www.geocities.com/cheluvi">www.geocities.com/cheluvi</A></=
FONT></DIV></BODY></HTML>
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