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 #include <signal.h>
  24
  25 #include "unit.h"
  26 #include "target.h"
  27 #include "load-fragment.h"
  28 #include "log.h"
  29
  30 static const UnitActiveState state_translation_table[_TARGET_STATE_MAX] = {
  31         [TARGET_DEAD] = UNIT_INACTIVE,
  32         [TARGET_ACTIVE] = UNIT_ACTIVE
  33 };
  34
  35 static const char* const state_string_table[_TARGET_STATE_MAX] = {
  36         [TARGET_DEAD] = "dead",
  37         [TARGET_ACTIVE] = "active"
  38 };
  39
  40 static void target_dump(Unit *u, FILE *f, const char *prefix) {
  41         Target *t = TARGET(u);
  42
  43         assert(t);
  44         assert(f);
  45
  46         fprintf(f,
  47                 "%sTarget State: %s\n",
  48                 prefix, state_string_table[t->state]);
  49 }
  50
  51 static void target_set_state(Target *t, TargetState state) {
  52         TargetState old_state;
  53         assert(t);
  54
  55         old_state = t->state;
  56         t->state = state;
  57
  58         log_debug("%s changed %s → %s", unit_id(UNIT(t)), state_string_table[old_state], state_string_table[state]);
  59
  60         unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state]);
  61 }
  62
  63 static int target_start(Unit *u) {
  64         Target *t = TARGET(u);
  65
  66         assert(t);
  67         assert(t->state == TARGET_DEAD);
  68
  69         target_set_state(t, TARGET_ACTIVE);
  70         return 0;
  71 }
  72
  73 static int target_stop(Unit *u) {
  74         Target *t = TARGET(u);
  75
  76         assert(t);
  77         assert(t->state == TARGET_ACTIVE);
  78
  79         target_set_state(t, TARGET_DEAD);
  80         return 0;
  81 }
  82
  83 static UnitActiveState target_active_state(Unit *u) {
  84         assert(u);
  85
  86         return state_translation_table[TARGET(u)->state];
  87 }
  88
  89 const UnitVTable target_vtable = {
  90         .suffix = ".target",
  91
  92         .init = unit_load_fragment_and_dropin,
  93
  94         .dump = target_dump,
  95
  96         .start = target_start,
  97         .stop = target_stop,
  98
  99         .active_state = target_active_state
 100 };