lib/libminlib/vm_query_exit.c

   1 #define _SYSTEM 1
   2 #include <lib.h>
   3 #include <unistd.h>
   4 #include <string.h>
   5
   6 /* return -1, when the query itself or the processing of query has errors.
   7  * return 1, when there are more processes waiting to be queried.
   8  * return 0, when there are no more processes.
   9  * note that for the return value of 0 and 1, the 'endpt' is set accordingly.
  10  */
  11 int vm_query_exit(int *endpt)
  12 {
  13         message m;
  14         int r;
  15
  16         r = _syscall(VM_PROC_NR, VM_QUERY_EXIT, &m);
  17         if (r != OK)
  18                 return -1;
  19         if (endpt == NULL)
  20                 return -1;
  21
  22         *endpt = m.VM_QUERY_RET_PT;
  23         return (m.VM_QUERY_IS_MORE ? 1 : 0);
  24 }
  25
  26 int vm_watch_exit(endpoint_t ep)
  27 {
  28         message m;
  29
  30         memset(&m, 0, sizeof(m));
  31         m.VM_WE_EP = ep;
  32         return _syscall(VM_PROC_NR, VM_WATCH_EXIT, &m);
  33 }