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_EXEC_COMMAND_INTERFACE("ExecActivate")                      \
  39         BUS_EXEC_COMMAND_INTERFACE("ExecDeactivate")                    \
  40         BUS_EXEC_CONTEXT_INTERFACE                                      \
  41         BUS_KILL_CONTEXT_INTERFACE                                      \
  42         "  <property name=\"ControlPID\" type=\"u\" access=\"read\"/>\n" \
  43         "  <property name=\"Result\" type=\"s\" access=\"read\"/>\n"    \
  44         " </interface>\n"
  45
  46 #define INTROSPECTION                                                   \
  47         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
  48         "<node>\n"                                                      \
  49         BUS_UNIT_INTERFACE                                              \
  50         BUS_SWAP_INTERFACE                                              \
  51         BUS_PROPERTIES_INTERFACE                                        \
  52         BUS_PEER_INTERFACE                                              \
  53         BUS_INTROSPECTABLE_INTERFACE                                    \
  54         "</node>\n"
  55
  56 #define INTERFACES_LIST                              \
  57         BUS_UNIT_INTERFACES_LIST                     \
  58         "org.freedesktop.systemd1.Swap\0"
  59
  60 const char bus_swap_interface[] _introspect_("Swap") = BUS_SWAP_INTERFACE;
  61
  62 const char bus_swap_invalidating_properties[] =
  63         "What\0"
  64         "Priority\0"
  65         "ExecActivate\0"
  66         "ExecDeactivate\0"
  67         "ControlPID\0"
  68         "Result\0";
  69
  70 static int bus_swap_append_priority(DBusMessageIter *i, const char *property, void *data) {
  71         Swap *s = data;
  72         dbus_int32_t j;
  73
  74         assert(i);
  75         assert(property);
  76         assert(s);
  77
  78         if (s->from_proc_swaps)
  79                 j = s->parameters_proc_swaps.priority;
  80         else if (s->from_fragment)
  81                 j = s->parameters_fragment.priority;
  82         else
  83                 j = -1;
  84
  85         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, &j))
  86                 return -ENOMEM;
  87
  88         return 0;
  89 }
  90
  91 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_swap_append_swap_result, swap_result, SwapResult);
  92
  93 static const BusProperty bus_swap_properties[] = {
  94         { "What",       bus_property_append_string, "s", offsetof(Swap, what),  true },
  95         { "Priority",   bus_swap_append_priority,   "i", 0 },
  96         BUS_EXEC_COMMAND_PROPERTY("ExecActivate",   offsetof(Swap, exec_command[SWAP_EXEC_ACTIVATE]),   false),
  97         BUS_EXEC_COMMAND_PROPERTY("ExecDeactivate", offsetof(Swap, exec_command[SWAP_EXEC_DEACTIVATE]), false),
  98         { "ControlPID", bus_property_append_pid,    "u", offsetof(Swap, control_pid) },
  99         { "Result",     bus_swap_append_swap_result,"s", offsetof(Swap, result)      },
 100         { NULL, }
 101 };
 102
 103 DBusHandlerResult bus_swap_message_handler(Unit *u, DBusConnection *c, DBusMessage *message) {
 104         Swap *s = SWAP(u);
 105         const BusBoundProperties bps[] = {
 106                 { "org.freedesktop.systemd1.Unit", bus_unit_properties,           u },
 107                 { "org.freedesktop.systemd1.Swap", bus_swap_properties,           s },
 108                 { "org.freedesktop.systemd1.Swap", bus_exec_context_properties,   &s->exec_context },
 109                 { "org.freedesktop.systemd1.Swap", bus_kill_context_properties,   &s->kill_context },
 110                 { "org.freedesktop.systemd1.Swap", bus_cgroup_context_properties, &s->cgroup_context },
 111                 { NULL, }
 112         };
 113
 114         SELINUX_UNIT_ACCESS_CHECK(u, c, message, "status");
 115
 116         return bus_default_message_handler(c, message, INTROSPECTION, INTERFACES_LIST, bps);
 117 }
 118
 119 int bus_swap_set_property(
 120                 Unit *u,
 121                 const char *name,
 122                 DBusMessageIter *i,
 123                 UnitSetPropertiesMode mode,
 124                 DBusError *error) {
 125
 126         Swap *s = SWAP(u);
 127         int r;
 128
 129         assert(name);
 130         assert(u);
 131         assert(i);
 132
 133         r = bus_cgroup_set_property(u, &s->cgroup_context, name, i, mode, error);
 134         if (r != 0)
 135                 return r;
 136
 137         return 0;
 138 }
 139
 140 int bus_swap_commit_properties(Unit *u) {
 141         assert(u);
 142
 143         unit_realize_cgroup(u);
 144         return 0;
 145 }