-static bool
-elect_display_filter(Session *s) {
- /* Return true if the session is a candidate for the user’s ‘primary
- * session’ or ‘display’. */
- assert(s);
-
- return (s->class == SESSION_USER && !s->stopping);
-}
-
-static int
-elect_display_compare(Session *s1, Session *s2) {
- /* Indexed by SessionType. Lower numbers mean more preferred. */
- const int type_ranks[_SESSION_TYPE_MAX] = {
- [SESSION_UNSPECIFIED] = 0,
- [SESSION_TTY] = -2,
- [SESSION_X11] = -3,
- [SESSION_WAYLAND] = -3,
- [SESSION_MIR] = -3,
- [SESSION_WEB] = -1,
- };
-
- /* Calculate the partial order relationship between s1 and s2,
- * returning < 0 if s1 is preferred as the user’s ‘primary session’,
- * 0 if s1 and s2 are equally preferred or incomparable, or > 0 if s2
- * is preferred.
- *
- * s1 or s2 may be NULL. */
- if ((s1 == NULL) != (s2 == NULL))
- return (s1 == NULL) - (s2 == NULL);
-
- if (s1->stopping != s2->stopping)
- return s1->stopping - s2->stopping;
-
- if ((s1->class != SESSION_USER) != (s2->class != SESSION_USER))
- return (s1->class != SESSION_USER) - (s2->class != SESSION_USER);
-
- if ((s1->type == _SESSION_TYPE_INVALID) != (s2->type == _SESSION_TYPE_INVALID))
- return (s1->type == _SESSION_TYPE_INVALID) - (s2->type == _SESSION_TYPE_INVALID);
-
- if (s1->type != s2->type)
- return type_ranks[s1->type] - type_ranks[s2->type];
-
- return 0;
-}
-