[Linux-cluster] What can cause dlm_pthread_init to generate an errno 13?

[Josef Whiter]

Run it as root.

Josef

On Thu, Nov 02, 2006 at 12:51:34PM -0500, Eric Johnson wrote:
> Hi -
> 
> I must be very dumb.  I'm unable to do what I would consider to be the
> "Hello World" of user mode dlm.
> 
> [ejohnson at gfsa01:~/projects/dlm-simple] cat foo.cpp
> #include <errno.h>
> #include <stdio.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <stdint.h>
> 
> extern "C" {
>  #include <libdlm.h>
> }
> #include <pthread.h>
> 
> main(int argc, char **argv)
> {
>  printf("hello world\n");
>  char lockName[] = "foobar" ;
> 
>  int initStatus = dlm_pthread_init();
>  printf("initStatus: %d, errno: %d\n",initStatus,errno);
> 
>  int lockid =0 ;
>  int status = lock_resource( lockName, LKM_EXMODE, 0, &lockid ) ;
>  printf("status: %d, errno: %d\n",status,errno);
> }
> [ejohnson at gfsa01:~/projects/dlm-simple] touch foo.cpp
> 
> [ejohnson at gfsa01:~/projects/dlm-simple] make
> g++ -D_REENTRANT foo.cpp -o foo -ldlm -lpthread
> ./foo/home/dev/util/linux64/bin/ld: skipping incompatible
> /home/dev/util/linux64/lib/gcc/x86_64-unknown-linux-gnu/4.1.1/libstdc++.a
> when searching for -lstdc++
> 
> [ejohnson at gfsa01:~/projects/dlm-simple] ./foo
> hello world
> initStatus: -1, errno: 13
> status: -1, errno: 13
> 
> I have googled around endlessly and been unable to find any insight as
> to what it is that I'm missing.
> 
> I'll gladly take a terse - "Hey knucklehead, go read this page in more 
> detail."
> 
> -Eric
> 
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