[Linux-cluster] Simple dlm demo program, and a bug...

[Daniel Phillips <phillips@xxxxxxxxxx>]

Hi Patrick,

With the "pad" commented out, it segfaults, with the pad it runs fine.  So
something is stepping out of bounds.

Regards,

Daniel

-----------------------------
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <linux/major.h>
#include <sys/types.h>
#include <libdlm.h>

#define warn(string, args...) do { fprintf(stderr, "%s: " string "\n", __func__, ##args); } while (0)
#define error(string, args...) do { warn(string, ##args); } while (0)

void my_ast(void *arg)
{
 warn("ast got arg %p", arg);
}

int main(void)
{
 int running = 1;
 int fd;
//int pad;
 struct dlm_lksb *lksb;

 if ((fd = dlm_get_fd()) < 0)
  error("dlm error %i, %s", errno, strerror(errno));

 switch (fork()) {
 case -1:
  error("fork error %i, %s", errno, strerror(errno));
 case 0:
      while (running)
   dlm_dispatch(fd);
  printf("dispatch exiting\n");
  return 0;
 }

 if (dlm_lock(LKM_PWMODE, lksb, LKF_NOQUEUE, "foo", 3,
  0, my_ast, (void *)&fd, NULL, NULL) < 0)
  error("dlm error %i, %s\n", errno, strerror(errno));

 sleep(1);

 if (dlm_unlock(lksb->sb_lkid, 0, lksb, NULL) < 0)
  error("dlm error %i, %s\n", errno, strerror(errno));

 running = 0;
 return 0;
}