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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