/* mqgetatr.c */

/* Get attributes of  message queue */
/* To compile: cc mqgetatr.c -lposix4 */

#include <mqueue.h>
#include <errno.h>

struct mq_attr mqattr;

main(
int argc,
char **argv)
{
   mqd_t mq;
   int   rc;
   unsigned int priority;

   mq = mq_open("/mq.jmw", O_RDONLY, 0700, NULL);
   printf("mq = %p \n", mq);

   rc = mq_getattr(mq, &mqattr);
   if (rc == -1)
   {
       printf("Error was: \"%s\"",strerror(errno));
       exit(1);
   }
   printf("%d %d %d %d \n",
           mqattr.mq_flags,
           mqattr.mq_maxmsg,
           mqattr.mq_msgsize,
           mqattr.mq_curmsgs);

}