Date: Mon, 3 Nov 2014 06:28:26 +0000 From: Nagesh Akula <Nagesh.Akula@Emulex.Com> To: "freebsd-drivers@freebsd.org" <freebsd-drivers@freebsd.org> Subject: ZLIB FreeBSD 9.1 version + deflateInit_ Symbol not found Message-ID: <383FAC81A1B4D54E8BF7C31A699555FF11DE48DA@CMEXMB1.ad.emulex.com>
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Hi,
I am trying to add compression algorithm within the kernel module.
For this, I have included <net/zlib.h> library calls.
With this getting an linker error,
in FreeBSD 9.1 OS version, getting kldload linker error on deflateInit_ sym=
bol.
link_elf_obj: symbol deflateInit_ undefined
linker_load_file: Unsupported file type
But, in FreeBSD 10.0 version, the zlib library is able to link properly, an=
d module is working fine.
Please let me know, if there is any way to link ZLIB with our module in Fre=
eBSD 9.1 ?
Thank you.
-NAKULA.
Below are additional details:
Tested OS revision:
# uname -a
FreeBSD FreeBSD-170 9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243825: Tue Dec 4 =
09:23:10 UTC 2012 root@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GEN=
ERIC amd64
Tested module file used for ZLIB issue reproduction:
#include <sys/types.h>
#include <sys/module.h>
#include <sys/systm.h> /* uprintf */
#include <sys/errno.h>
#include <sys/param.h> /* defines used in kernel.h */
#include <sys/kernel.h> /* types used in module initialization */
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <net/zlib.h>
void skel_zlib_test(void);
static void *
z_alloc(void *unused, uint32_t items, uint32_t size)
{
void *ptr;
ptr =3D malloc(items * size, M_DEVBUF, M_NOWAIT|M_ZERO);
return ptr;
}
static void
z_free(void *opaque, void *ptr)
{
free(ptr, M_DEVBUF);
}
void skel_zlib_test(void)
{
z_stream zInfo;
int rc;
zInfo.zalloc =3D (alloc_func)z_alloc;
zInfo.zfree =3D (free_func)z_free;
zInfo.opaque =3D NULL;
rc =3D deflateInit(&zInfo, Z_DEFAULT_COMPRESSION);
deflateEnd(&zInfo);
}
/*
* Load handler that deals with the loading and unloading of a KLD.
*/
static int
skel_loader(struct module *m, int what, void *arg)
{
int err =3D 0;
switch (what) {
case MOD_LOAD: /* kldload */
uprintf("Skeleton KLD loaded.\n");
skel_zlib_test();
break;
case MOD_UNLOAD:
uprintf("Skeleton KLD unloaded.\n");
break;
default:
err =3D EOPNOTSUPP;
break;
}
return(err);
}
/* Declare this module to the rest of the kernel */
static moduledata_t skel_mod =3D {
"skel",
skel_loader,
NULL
};
DECLARE_MODULE(skeleton, skel_mod, SI_SUB_KLD, SI_ORDER_ANY);
---
Makefile:
SRCS=3Dskel.c
KMOD=3Dskel
.include <bsd.kmod.mk>
Error:
# kldload ./skel.ko
# dmesg
link_elf_obj: symbol deflateInit_ undefined
linker_load_file: Unsupported file type
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