Re: unresolved: htonl(), htons(), __memcpy3d

[aprasad@in.ibm.com]

just compile with -O2 options.

Regards,
Anil.

Mike Brown <mbrown@cs.uml.edu> on 02/22/2001 04:14:35 PM

Please respond to Mike Brown <mbrown@cs.uml.edu>

To:   kernelnewbies@nl.linux.org
cc:    (bcc: Anil K Prasad/India/IBM)
Subject:  unresolved:  htonl(), htons(), __memcpy3d




Hello,

The below file contains a few trivial modifications to hello.c from the
The Linux Kernel Module Programming Guide but the example shows my
problem.  I'm running linux-2.4.2, gcc 2.95.2.  Here's the output from
gcc:

gcc -Wall -DMODULE -D__KERNEL__ -DLINUX -c testprog.c
-I/usr/src/linux/include
testprog.c: In function `init_module':
testprog.c:20: warning: implicit declaration of function
`printk_R1b7d4074'
testprog.c:16: warning: unused variable `tmp2'
testprog.c:15: warning: unused variable `tmp1'

A few warnings, no big deal.  However when I load the module i get:

insmod ./testprog.o
./testprog.o: unresolved symbol htonl
./testprog.o: unresolved symbol htons
./testprog.o: unresolved symbol __memcpy3d

I'm using memcpy() which is declared in linux/string.h and I'm including
linux/byteorder/generic.h which is supposed to #define htonl() and company
as macros.  Any insight to what I'm doing wrong here would be helpful.
Thanks.

---------------------- cut below here ------------------------------

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>

#include <linux/byteorder/generic.h>


#if CONFIG_MODVERSIONS==1
#define MODVERSIONS
#include <linux/modversions.h>
#endif

int init_module()
{
  int tmp1 = htonl (68000);
  short tmp2 = htons (35);
  char buf1[5] = { 't', 'e', 's', 't', '\0' };
  char buf2[5];

  printk("Hello, world - this is the kernel speaking\n");

  memcpy (buf1, buf2, strlen (buf1) + 1);

  return 0;
}

void cleanup_module()
{
  printk("Short is the life of a kernel module\n");
}

---------------------- cut above here -------------------------



-Michael F. Brown, UMass Lowell Computer Science

phone:  (978) 934-5354
email:  mbrown@cs.uml.edu


"In theory, there is no difference between theory and practice,
 but in practice, there is."       - Jan L.A. van de Snepscheut

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-
Kernelnewbies: Help each other learn about the Linux kernel.
Archive:       http://mail.nl.linux.org/
IRC Channel:   irc.openprojects.net / #kernelnewbies
Web Page:      http://www.surriel.com/kernelnewbies.shtml