target.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 #include "unit.h"
   4 #include "target.h"
   5 #include "load-fragment.h"
   6 #include "log.h"
   7
   8 static const UnitActiveState state_translation_table[_TARGET_STATE_MAX] = {
   9         [TARGET_DEAD] = UNIT_INACTIVE,
  10         [TARGET_ACTIVE] = UNIT_ACTIVE
  11 };
  12
  13 static const char* const state_string_table[_TARGET_STATE_MAX] = {
  14         [TARGET_DEAD] = "dead",
  15         [TARGET_ACTIVE] = "active"
  16 };
  17
  18 static void target_dump(Unit *u, FILE *f, const char *prefix) {
  19         Target *t = TARGET(u);
  20
  21         assert(t);
  22         assert(f);
  23
  24         fprintf(f,
  25                 "%sTarget State: %s\n",
  26                 prefix, state_string_table[t->state]);
  27 }
  28
  29 static void target_set_state(Target *t, TargetState state) {
  30         TargetState old_state;
  31         assert(t);
  32
  33         old_state = t->state;
  34         t->state = state;
  35
  36         log_debug("%s changed %s → %s", unit_id(UNIT(t)), state_string_table[old_state], state_string_table[state]);
  37
  38         unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state]);
  39 }
  40
  41 static int target_start(Unit *u) {
  42         Target *t = TARGET(u);
  43
  44         assert(t);
  45         assert(t->state == TARGET_DEAD);
  46
  47         target_set_state(t, TARGET_ACTIVE);
  48         return 0;
  49 }
  50
  51 static int target_stop(Unit *u) {
  52         Target *t = TARGET(u);
  53
  54         assert(t);
  55         assert(t->state == TARGET_ACTIVE);
  56
  57         target_set_state(t, TARGET_DEAD);
  58         return 0;
  59 }
  60
  61 static UnitActiveState target_active_state(Unit *u) {
  62         assert(u);
  63
  64         return state_translation_table[TARGET(u)->state];
  65 }
  66
  67 const UnitVTable target_vtable = {
  68         .suffix = ".target",
  69
  70         .init = unit_load_fragment_and_dropin,
  71
  72         .dump = target_dump,
  73
  74         .start = target_start,
  75         .stop = target_stop,
  76
  77         .active_state = target_active_state
  78 };