src/core/dbus-swap.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7   Copyright 2010 Maarten Lankhorst
   8
   9   systemd is free software; you can redistribute it and/or modify it
  10   under the terms of the GNU Lesser General Public License as published by
  11   the Free Software Foundation; either version 2.1 of the License, or
  12   (at your option) any later version.
  13
  14   systemd is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   Lesser General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  21 ***/
  22
  23 #include <errno.h>
  24
  25 #include "dbus-unit.h"
  26 #include "dbus-execute.h"
  27 #include "dbus-kill.h"
  28 #include "dbus-cgroup.h"
  29 #include "dbus-common.h"
  30 #include "selinux-access.h"
  31 #include "dbus-swap.h"
  32
  33 #define BUS_SWAP_INTERFACE                                              \
  34         " <interface name=\"org.freedesktop.systemd1.Swap\">\n"         \
  35         "  <property name=\"What\" type=\"s\" access=\"read\"/>\n"      \
  36         "  <property name=\"Priority\" type=\"i\" access=\"read\"/>\n"  \
  37         "  <property name=\"TimeoutUSec\" type=\"t\" access=\"read\"/>\n" \
  38         BUS_UNIT_CGROUP_INTERFACE                                       \
  39         BUS_EXEC_COMMAND_INTERFACE("ExecActivate")                      \
  40         BUS_EXEC_COMMAND_INTERFACE("ExecDeactivate")                    \
  41         BUS_EXEC_CONTEXT_INTERFACE                                      \
  42         BUS_KILL_CONTEXT_INTERFACE                                      \
  43         BUS_CGROUP_CONTEXT_INTERFACE                                    \
  44         "  <property name=\"ControlPID\" type=\"u\" access=\"read\"/>\n" \
  45         "  <property name=\"Result\" type=\"s\" access=\"read\"/>\n"    \
  46         " </interface>\n"
  47
  48 #define INTROSPECTION                                                   \
  49         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
  50         "<node>\n"                                                      \
  51         BUS_UNIT_INTERFACE                                              \
  52         BUS_SWAP_INTERFACE                                              \
  53         BUS_PROPERTIES_INTERFACE                                        \
  54         BUS_PEER_INTERFACE                                              \
  55         BUS_INTROSPECTABLE_INTERFACE                                    \
  56         "</node>\n"
  57
  58 #define INTERFACES_LIST                              \
  59         BUS_UNIT_INTERFACES_LIST                     \
  60         "org.freedesktop.systemd1.Swap\0"
  61
  62 const char bus_swap_interface[] _introspect_("Swap") = BUS_SWAP_INTERFACE;
  63
  64 const char bus_swap_invalidating_properties[] =
  65         "What\0"
  66         "Priority\0"
  67         "ExecActivate\0"
  68         "ExecDeactivate\0"
  69         "ControlPID\0"
  70         "Result\0";
  71
  72 static int bus_swap_append_priority(DBusMessageIter *i, const char *property, void *data) {
  73         Swap *s = data;
  74         dbus_int32_t j;
  75
  76         assert(i);
  77         assert(property);
  78         assert(s);
  79
  80         if (s->from_proc_swaps)
  81                 j = s->parameters_proc_swaps.priority;
  82         else if (s->from_fragment)
  83                 j = s->parameters_fragment.priority;
  84         else
  85                 j = -1;
  86
  87         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, &j))
  88                 return -ENOMEM;
  89
  90         return 0;
  91 }
  92
  93 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_swap_append_swap_result, swap_result, SwapResult);
  94
  95 static const BusProperty bus_swap_properties[] = {
  96         { "What",       bus_property_append_string, "s", offsetof(Swap, what),  true },
  97         { "Priority",   bus_swap_append_priority,   "i", 0 },
  98         BUS_EXEC_COMMAND_PROPERTY("ExecActivate",   offsetof(Swap, exec_command[SWAP_EXEC_ACTIVATE]),   false),
  99         BUS_EXEC_COMMAND_PROPERTY("ExecDeactivate", offsetof(Swap, exec_command[SWAP_EXEC_DEACTIVATE]), false),
 100         { "ControlPID", bus_property_append_pid,    "u", offsetof(Swap, control_pid) },
 101         { "Result",     bus_swap_append_swap_result,"s", offsetof(Swap, result)      },
 102         { NULL, }
 103 };
 104
 105 DBusHandlerResult bus_swap_message_handler(Unit *u, DBusConnection *c, DBusMessage *message) {
 106         Swap *s = SWAP(u);
 107         const BusBoundProperties bps[] = {
 108                 { "org.freedesktop.systemd1.Unit", bus_unit_properties,           u },
 109                 { "org.freedesktop.systemd1.Swap", bus_unit_cgroup_properties,    u },
 110                 { "org.freedesktop.systemd1.Swap", bus_swap_properties,           s },
 111                 { "org.freedesktop.systemd1.Swap", bus_exec_context_properties,   &s->exec_context },
 112                 { "org.freedesktop.systemd1.Swap", bus_kill_context_properties,   &s->kill_context },
 113                 { "org.freedesktop.systemd1.Swap", bus_cgroup_context_properties, &s->cgroup_context },
 114                 { NULL, }
 115         };
 116
 117         SELINUX_UNIT_ACCESS_CHECK(u, c, message, "status");
 118
 119         return bus_default_message_handler(c, message, INTROSPECTION, INTERFACES_LIST, bps);
 120 }
 121
 122 int bus_swap_set_property(
 123                 Unit *u,
 124                 const char *name,
 125                 DBusMessageIter *i,
 126                 UnitSetPropertiesMode mode,
 127                 DBusError *error) {
 128
 129         Swap *s = SWAP(u);
 130         int r;
 131
 132         assert(name);
 133         assert(u);
 134         assert(i);
 135
 136         r = bus_cgroup_set_property(u, &s->cgroup_context, name, i, mode, error);
 137         if (r != 0)
 138                 return r;
 139
 140         return 0;
 141 }
 142
 143 int bus_swap_commit_properties(Unit *u) {
 144         assert(u);
 145
 146         unit_realize_cgroup(u);
 147         return 0;
 148 }