From: kernelnewbies-bounce@xxxxxxxxxxxx on behalf of linux lover
Sent: Tue 2/22/2005 11:11 AM
To: Shyamjithe; Srinivas G.; bulb@xxxxxx; amith@xxxxxxxxxxxxxxx; karthik301176@xxxxxxxxx; gauravd_linux@xxxxxxxxx; godepankaj@xxxxxxxxxxxxxx; J.A.K.Mouw@xxxxxxxxxxxxxxxxx
Cc: kernelnewbies@xxxxxxxxxxxx
Subject: Re: Creating a file in kernel Module -- working fine
Hello
Shyamjithe,
The same way Srinivas compile with his
Makefile. I uses that Makefile and
compile it without
error. I also check /proc/ksyms and disnot find
any
sys_open and sys_write exported functions
symbol
there.
What should i do now? how to insmod it
without unresolved
error?
regards,
Linux_lover.
--- Shyamjithe
<shyamjithe@xxxxxxxxxxxxxxx> wrote:
> HI LIN
LOVER
>
I THINK YOUR KERNEL IS NOT EXPORTING
> THOSE SYMBOLS . HOW DID
>
YOU COMPILE THE FILE.
> SHYAM
>
> shyamjithe.c.s
>
Networking & Communications Group
> Tata Elxsi Ltd.
>
(Ph) +91-471-2527214
> (Fax) +91-471-2527215
>
____________________________________
>
> ----- Original Message
-----
> From: "linux lover" <linux_lover2004@xxxxxxxxx>
> To:
"Srinivas G." <srinivasg@xxxxxxxxxxxxxxxxxxxxx>;
>
>
<shyamjithe@xxxxxxxxxxxxxxx>; <bulb@xxxxxx>;
>
<amith@xxxxxxxxxxxxxxx>;
> <karthik301176@xxxxxxxxx>;
>
<gauravd_linux@xxxxxxxxx>;
>
<godepankaj@xxxxxxxxxxxxxx>;
>
<J.A.K.Mouw@xxxxxxxxxxxxxxxxx>
> Cc:
<kernelnewbies@xxxxxxxxxxxx>
> Sent: Tuesday, February 22, 2005
10:44 AM
> Subject: Re: Creating a file in kernel Module --
>
working fine
>
>
> > Hello Srinivas,
>
> I am using
RedHat 9 with its kernel
> > 2.4.20-8 . When i make your program it
compiled
> > successfully but i am getting following errors
>
while i
> > insmod
> > insmod cf.o
> > cf.o:
unresolved symbol sys_open
> > cf.o: unresolved symbol
sys_write
> >
> > regards,
> > linux_lover.
>
>
> > --- "Srinivas G."
>
<srinivasg@xxxxxxxxxxxxxxxxxxxxx>
> > wrote:
> >
>
>> Dear All,
> >>
> >> I have gone through your
mails. Based on those
> mail
> >> messages I have
>
>> created a test module in the kernel to create a
> >> file.
It was compiled
> >> fine with out any error messages and
working
> fine.
> >>
> >> I am using Red Hat 7.3
with 2.4.18-3 kernel
> version.
> >> Please fine the
>
>> code below.
> >>
> >> cre_fil.c
>
>>
>
>
>
------------------------------------------------------------------
>
>> #include <linux/kernel.h>
> >> #include
<linux/module.h>
> >> #include <asm/fcntl.h> /* for
O_WRONLY */
> >> #include <linux/syscall.h> /* for sys_
functions
> */
> >> #include <asm/uaccess.h> /* for
set_fs(),
> get_fs()
> >> etc. */
> >> #include
<linux/string.h> /* for string length */
> >> #include
<linux/slab.h> /* for kmalloc */
> >>
> >>
MODULE_LICENSE("GPL");
> >>
> >> typedef struct
tagWRITE_TEST
> >> {
> >> unsigned long fd;
>
>> unsigned long x;
> >>
> >> }WRITE_TEST,
*PWRITE_TEST;
> >>
> >> PWRITE_TEST ptest;
>
>>
> >> void SysPrint(char * pString, ...)
> >>
{
> >> static char buff[1024];
> >> va_list ap;
>
>>
> >> va_start(ap,pString);
> >> vsprintf((char
*)buff, pString, ap);
> >> va_end(ap);
> >>
>
>> sys_write(ptest->fd,(char *)buff,strlen(buff));
> >>
}
> >>
> >> int init_module(void)
> >>
{
> >>
> >> printk("<%s>
invoked!\n",__FUNCTION__);
> >> printk("File Creation Testing in
Kernel
> >> Module!\n");
> >>
> >>
set_fs(get_ds());
> >>
> >> /* allocate the memory for
structre */
> >> ptest =
> >>
>
(PWRITE_TEST)kmalloc(sizeof(WRITE_TEST),GFP_KERNEL);
> >> if(ptest
== NULL)
> >> {
> >> printk("Structure Memory Allocation
Fails!\n");
> >> return -ENOMEM;
> >> }
>
>>
> >> ptest->fd = sys_open("srcdebug.txt", O_CREAT
|
> >> O_WRONLY, 644);
> >> if (ptest->fd ==
0)
> >> {
> >> printk("File Creation
Error!!!\n");
> >> return 1;
> >> }
>
>>
> >> SysPrint("File Creation Testing in Kernel
>
>> Module!\n");
> >> SysPrint("Srinivas Testing the File
Creation\n");
> >>
> >> /* close the file here
*/
> >> sys_close(ptest->fd);
> >>
> >>
return 0;
> >> }
> >>
> >> void
cleanup_module(void)
> >> {
> >> printk("Good
bye!\n");
> >>
> >> /* free the allocated memory
*/
> >> kfree(ptest);
> >>
> >> }
>
>>
> >> Makefile
> >>
------------------------------------------------
> >>
INCDIR=/usr/src/linux-2.4/include
> >>
> >>
CFLAGS=-DMODULE -D__KERNEL__ -I$(INCDIR) -O2
> -Wall
>
>>
> >> OBJS=cre_fil.o
> >> TARGET=cf.o
>
>>
> >> $(TARGET): $(OBJS)
> >> $(LD) -r -o
$(TARGET) $(OBJS)
> >>
> >> clean:
> >>
$(RM) -f $(TARGET) $(OBJS)
> >>
> >>
>
>
>
------------------------------------------------------------------------
>
>> --
> >>
> >> I need some information. Where can
I get the
> >> information for sys_create,
> >>
sys_write, sys_read, set_fs, get_fs, get_ds etc
> >> calls?
>
>>
> >> Please provide any links which are related to
>
that
> >> calls or any books.
> >>
> >>
Thanks and regards,
> >> Srinivas G
> >>
>
>
> >
> >
> >
> >
__________________________________
> > Do you Yahoo!?
> > All
your favorites on one personal page - Try My
> Yahoo!
> > http://my.yahoo.com
>
>
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