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         if (state == t->state)
  56                 return;
  57
  58         old_state = t->state;
  59         t->state = state;
  60
  61         log_debug("%s changed %s → %s", unit_id(UNIT(t)), state_string_table[old_state], state_string_table[state]);
  62
  63         unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state]);
  64 }
  65
  66 static int target_start(Unit *u) {
  67         Target *t = TARGET(u);
  68
  69         assert(t);
  70         assert(t->state == TARGET_DEAD);
  71
  72         target_set_state(t, TARGET_ACTIVE);
  73         return 0;
  74 }
  75
  76 static int target_stop(Unit *u) {
  77         Target *t = TARGET(u);
  78
  79         assert(t);
  80         assert(t->state == TARGET_ACTIVE);
  81
  82         target_set_state(t, TARGET_DEAD);
  83         return 0;
  84 }
  85
  86 static UnitActiveState target_active_state(Unit *u) {
  87         assert(u);
  88
  89         return state_translation_table[TARGET(u)->state];
  90 }
  91
  92 int target_get_runlevel(Target *t) {
  93
  94         static const struct {
  95                 const char *special;
  96                 const int runlevel;
  97         } table[] = {
  98                 { SPECIAL_RUNLEVEL5_TARGET, '5' },
  99                 { SPECIAL_RUNLEVEL4_TARGET, '4' },
 100                 { SPECIAL_RUNLEVEL3_TARGET, '3' },
 101                 { SPECIAL_RUNLEVEL2_TARGET, '2' },
 102                 { SPECIAL_RUNLEVEL1_TARGET, '1' },
 103                 { SPECIAL_RUNLEVEL0_TARGET, '0' },
 104                 { SPECIAL_RUNLEVEL6_TARGET, '6' },
 105         };
 106
 107         unsigned i;
 108
 109         assert(t);
 110
 111         /* Tries to determine if this is a SysV runlevel and returns
 112          * it if that is so. */
 113
 114         for (i = 0; i < ELEMENTSOF(table); i++)
 115                 if (unit_has_name(UNIT(t), table[i].special))
 116                         return table[i].runlevel;
 117
 118         return 0;
 119 }
 120
 121 const UnitVTable target_vtable = {
 122         .suffix = ".target",
 123
 124         .init = unit_load_fragment_and_dropin,
 125
 126         .dump = target_dump,
 127
 128         .start = target_start,
 129         .stop = target_stop,
 130
 131         .active_state = target_active_state
 132 };