target.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 #include <errno.h>
   4
   5 #include "unit.h"
   6 #include "target.h"
   7 #include "load-fragment.h"
   8 #include "log.h"
   9
  10 static const UnitActiveState state_translation_table[_TARGET_STATE_MAX] = {
  11         [TARGET_DEAD] = UNIT_INACTIVE,
  12         [TARGET_ACTIVE] = UNIT_ACTIVE
  13 };
  14
  15 static const char* const state_string_table[_TARGET_STATE_MAX] = {
  16         [TARGET_DEAD] = "dead",
  17         [TARGET_ACTIVE] = "active"
  18 };
  19
  20 static int target_init(Unit *u) {
  21         int r;
  22         assert(u);
  23
  24         /* Make sure this config file actually exists */
  25
  26         if ((r = unit_load_fragment_and_dropin(u)) <= 0)
  27                 return r < 0 ? r : -ENOENT;
  28
  29         return 0;
  30 }
  31
  32 static void target_dump(Unit *u, FILE *f, const char *prefix) {
  33         Target *t = TARGET(u);
  34
  35         assert(t);
  36         assert(f);
  37
  38         fprintf(f,
  39                 "%sTarget State: %s\n",
  40                 prefix, state_string_table[t->state]);
  41 }
  42
  43 static void target_set_state(Target *t, TargetState state) {
  44         TargetState old_state;
  45         assert(t);
  46
  47         old_state = t->state;
  48         t->state = state;
  49
  50         log_debug("%s changed %s → %s", unit_id(UNIT(t)), state_string_table[old_state], state_string_table[state]);
  51
  52         unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state]);
  53 }
  54
  55 static int target_start(Unit *u) {
  56         Target *t = TARGET(u);
  57
  58         assert(t);
  59         assert(t->state == TARGET_DEAD);
  60
  61         target_set_state(t, TARGET_ACTIVE);
  62         return 0;
  63 }
  64
  65 static int target_stop(Unit *u) {
  66         Target *t = TARGET(u);
  67
  68         assert(t);
  69         assert(t->state == TARGET_ACTIVE);
  70
  71         target_set_state(t, TARGET_DEAD);
  72         return 0;
  73 }
  74
  75 static UnitActiveState target_active_state(Unit *u) {
  76         assert(u);
  77
  78         return state_translation_table[TARGET(u)->state];
  79 }
  80
  81 const UnitVTable target_vtable = {
  82         .suffix = ".target",
  83
  84         .init = target_init,
  85
  86         .dump = target_dump,
  87
  88         .start = target_start,
  89         .stop = target_stop,
  90
  91         .active_state = target_active_state
  92 };