target.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23
  24 #include "unit.h"
  25 #include "target.h"
  26 #include "load-fragment.h"
  27 #include "log.h"
  28
  29 static const UnitActiveState state_translation_table[_TARGET_STATE_MAX] = {
  30         [TARGET_DEAD] = UNIT_INACTIVE,
  31         [TARGET_ACTIVE] = UNIT_ACTIVE
  32 };
  33
  34 static const char* const state_string_table[_TARGET_STATE_MAX] = {
  35         [TARGET_DEAD] = "dead",
  36         [TARGET_ACTIVE] = "active"
  37 };
  38
  39 static int target_init(Unit *u) {
  40         int r;
  41         assert(u);
  42
  43         /* Make sure this config file actually exists */
  44
  45         if ((r = unit_load_fragment_and_dropin(u)) <= 0)
  46                 return r < 0 ? r : -ENOENT;
  47
  48         return 0;
  49 }
  50
  51 static void target_dump(Unit *u, FILE *f, const char *prefix) {
  52         Target *t = TARGET(u);
  53
  54         assert(t);
  55         assert(f);
  56
  57         fprintf(f,
  58                 "%sTarget State: %s\n",
  59                 prefix, state_string_table[t->state]);
  60 }
  61
  62 static void target_set_state(Target *t, TargetState state) {
  63         TargetState old_state;
  64         assert(t);
  65
  66         old_state = t->state;
  67         t->state = state;
  68
  69         log_debug("%s changed %s → %s", unit_id(UNIT(t)), state_string_table[old_state], state_string_table[state]);
  70
  71         unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state]);
  72 }
  73
  74 static int target_start(Unit *u) {
  75         Target *t = TARGET(u);
  76
  77         assert(t);
  78         assert(t->state == TARGET_DEAD);
  79
  80         target_set_state(t, TARGET_ACTIVE);
  81         return 0;
  82 }
  83
  84 static int target_stop(Unit *u) {
  85         Target *t = TARGET(u);
  86
  87         assert(t);
  88         assert(t->state == TARGET_ACTIVE);
  89
  90         target_set_state(t, TARGET_DEAD);
  91         return 0;
  92 }
  93
  94 static UnitActiveState target_active_state(Unit *u) {
  95         assert(u);
  96
  97         return state_translation_table[TARGET(u)->state];
  98 }
  99
 100 const UnitVTable target_vtable = {
 101         .suffix = ".target",
 102
 103         .init = target_init,
 104
 105         .dump = target_dump,
 106
 107         .start = target_start,
 108         .stop = target_stop,
 109
 110         .active_state = target_active_state
 111 };