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 #include "dbus-target.h"
  30
  31 static const UnitActiveState state_translation_table[_TARGET_STATE_MAX] = {
  32         [TARGET_DEAD] = UNIT_INACTIVE,
  33         [TARGET_ACTIVE] = UNIT_ACTIVE
  34 };
  35
  36 static const char* const state_string_table[_TARGET_STATE_MAX] = {
  37         [TARGET_DEAD] = "dead",
  38         [TARGET_ACTIVE] = "active"
  39 };
  40
  41 static void target_dump(Unit *u, FILE *f, const char *prefix) {
  42         Target *t = TARGET(u);
  43
  44         assert(t);
  45         assert(f);
  46
  47         fprintf(f,
  48                 "%sTarget State: %s\n",
  49                 prefix, state_string_table[t->state]);
  50 }
  51
  52 static void target_set_state(Target *t, TargetState state) {
  53         TargetState old_state;
  54         assert(t);
  55
  56         old_state = t->state;
  57         t->state = state;
  58
  59         if (state != old_state)
  60                 log_debug("%s changed %s → %s", UNIT(t)->meta.id, state_string_table[old_state], state_string_table[state]);
  61
  62         unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state]);
  63 }
  64
  65 static int target_start(Unit *u) {
  66         Target *t = TARGET(u);
  67
  68         assert(t);
  69         assert(t->state == TARGET_DEAD);
  70
  71         target_set_state(t, TARGET_ACTIVE);
  72         return 0;
  73 }
  74
  75 static int target_stop(Unit *u) {
  76         Target *t = TARGET(u);
  77
  78         assert(t);
  79         assert(t->state == TARGET_ACTIVE);
  80
  81         target_set_state(t, TARGET_DEAD);
  82         return 0;
  83 }
  84
  85 static UnitActiveState target_active_state(Unit *u) {
  86         assert(u);
  87
  88         return state_translation_table[TARGET(u)->state];
  89 }
  90
  91 static const char *target_sub_state_to_string(Unit *u) {
  92         assert(u);
  93
  94         return state_string_table[TARGET(u)->state];
  95 }
  96
  97 int target_get_runlevel(Target *t) {
  98
  99         static const struct {
 100                 const char *special;
 101                 const int runlevel;
 102         } table[] = {
 103                 { SPECIAL_RUNLEVEL5_TARGET, '5' },
 104                 { SPECIAL_RUNLEVEL4_TARGET, '4' },
 105                 { SPECIAL_RUNLEVEL3_TARGET, '3' },
 106                 { SPECIAL_RUNLEVEL2_TARGET, '2' },
 107                 { SPECIAL_RUNLEVEL1_TARGET, '1' },
 108                 { SPECIAL_RUNLEVEL0_TARGET, '0' },
 109                 { SPECIAL_RUNLEVEL6_TARGET, '6' },
 110         };
 111
 112         unsigned i;
 113
 114         assert(t);
 115
 116         /* Tries to determine if this is a SysV runlevel and returns
 117          * it if that is so. */
 118
 119         for (i = 0; i < ELEMENTSOF(table); i++)
 120                 if (unit_has_name(UNIT(t), table[i].special))
 121                         return table[i].runlevel;
 122
 123         return 0;
 124 }
 125
 126 const UnitVTable target_vtable = {
 127         .suffix = ".target",
 128
 129         .load = unit_load_fragment_and_dropin,
 130
 131         .dump = target_dump,
 132
 133         .start = target_start,
 134         .stop = target_stop,
 135
 136         .active_state = target_active_state,
 137         .sub_state_to_string = target_sub_state_to_string,
 138
 139         .bus_message_handler = bus_target_message_handler
 140 };