src/login/logind-button.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2012 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 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   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <string.h>
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <sys/ioctl.h>
  27 #include <unistd.h>
  28 #include <linux/input.h>
  29
  30 #include "sd-messages.h"
  31 #include "conf-parser.h"
  32 #include "util.h"
  33 #include "special.h"
  34 #include "logind-button.h"
  35
  36 Button* button_new(Manager *m, const char *name) {
  37         Button *b;
  38
  39         assert(m);
  40         assert(name);
  41
  42         b = new0(Button, 1);
  43         if (!b)
  44                 return NULL;
  45
  46         b->name = strdup(name);
  47         if (!b->name) {
  48                 free(b);
  49                 return NULL;
  50         }
  51
  52         if (hashmap_put(m->buttons, b->name, b) < 0) {
  53                 free(b->name);
  54                 free(b);
  55                 return NULL;
  56         }
  57
  58         b->manager = m;
  59         b->fd = -1;
  60
  61         return b;
  62 }
  63
  64 void button_free(Button *b) {
  65         assert(b);
  66
  67         hashmap_remove(b->manager->buttons, b->name);
  68
  69         sd_event_source_unref(b->event_source);
  70
  71         if (b->fd >= 0) {
  72                 /* If the device has been unplugged close() returns
  73                  * ENODEV, let's ignore this, hence we don't use
  74                  * close_nointr_nofail() */
  75                 close(b->fd);
  76         }
  77
  78         free(b->name);
  79         free(b->seat);
  80         free(b);
  81 }
  82
  83 int button_set_seat(Button *b, const char *sn) {
  84         char *s;
  85
  86         assert(b);
  87         assert(sn);
  88
  89         s = strdup(sn);
  90         if (!s)
  91                 return -ENOMEM;
  92
  93         free(b->seat);
  94         b->seat = s;
  95
  96         return 0;
  97 }
  98
  99 static int button_handle(
 100                 Button *b,
 101                 InhibitWhat inhibit_key,
 102                 HandleAction handle,
 103                 bool ignore_inhibited,
 104                 bool is_edge) {
 105
 106         int r;
 107
 108         assert(b);
 109
 110         r = manager_handle_action(b->manager, inhibit_key, handle, ignore_inhibited, is_edge);
 111         if (r > 0)
 112                 /* We are executing the operation, so make sure we don't
 113                  * execute another one until the lid is opened/closed again */
 114                 b->lid_close_queued = false;
 115
 116         return 0;
 117 }
 118
 119 static int button_dispatch(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 120         Button *b = userdata;
 121         struct input_event ev;
 122         ssize_t l;
 123
 124         assert(s);
 125         assert(fd == b->fd);
 126         assert(b);
 127
 128         l = read(b->fd, &ev, sizeof(ev));
 129         if (l < 0)
 130                 return errno != EAGAIN ? -errno : 0;
 131         if ((size_t) l < sizeof(ev))
 132                 return -EIO;
 133
 134         if (ev.type == EV_KEY && ev.value > 0) {
 135
 136                 switch (ev.code) {
 137
 138                 case KEY_POWER:
 139                 case KEY_POWER2:
 140                         log_struct(LOG_INFO,
 141                                    "MESSAGE=Power key pressed.",
 142                                    MESSAGE_ID(SD_MESSAGE_POWER_KEY),
 143                                    NULL);
 144
 145                         button_handle(b, INHIBIT_HANDLE_POWER_KEY, b->manager->handle_power_key, b->manager->power_key_ignore_inhibited, true);
 146                         break;
 147
 148                 /* The kernel is a bit confused here:
 149
 150                    KEY_SLEEP   = suspend-to-ram, which everybody else calls "suspend"
 151                    KEY_SUSPEND = suspend-to-disk, which everybody else calls "hibernate"
 152                 */
 153
 154                 case KEY_SLEEP:
 155                         log_struct(LOG_INFO,
 156                                    "MESSAGE=Suspend key pressed.",
 157                                    MESSAGE_ID(SD_MESSAGE_SUSPEND_KEY),
 158                                    NULL);
 159
 160                         button_handle(b, INHIBIT_HANDLE_SUSPEND_KEY, b->manager->handle_suspend_key, b->manager->suspend_key_ignore_inhibited, true);
 161                         break;
 162
 163                 case KEY_SUSPEND:
 164                         log_struct(LOG_INFO,
 165                                    "MESSAGE=Hibernate key pressed.",
 166                                    MESSAGE_ID(SD_MESSAGE_HIBERNATE_KEY),
 167                                    NULL);
 168
 169                         button_handle(b, INHIBIT_HANDLE_HIBERNATE_KEY, b->manager->handle_hibernate_key, b->manager->hibernate_key_ignore_inhibited, true);
 170                         break;
 171                 }
 172
 173         } else if (ev.type == EV_SW && ev.value > 0) {
 174
 175                 if (ev.code == SW_LID) {
 176                         log_struct(LOG_INFO,
 177                                    "MESSAGE=Lid closed.",
 178                                    MESSAGE_ID(SD_MESSAGE_LID_CLOSED),
 179                                    NULL);
 180
 181                         b->lid_close_queued = true;
 182                         button_handle(b, INHIBIT_HANDLE_LID_SWITCH, b->manager->handle_lid_switch, b->manager->lid_switch_ignore_inhibited, true);
 183                 }
 184
 185         } else if (ev.type == EV_SW && ev.value == 0) {
 186
 187                 if (ev.code == SW_LID) {
 188                         log_struct(LOG_INFO,
 189                                    "MESSAGE=Lid opened.",
 190                                    MESSAGE_ID(SD_MESSAGE_LID_OPENED),
 191                                    NULL);
 192
 193                         b->lid_close_queued = false;
 194                 }
 195         }
 196
 197         return 0;
 198 }
 199
 200 int button_open(Button *b) {
 201         char *p, name[256];
 202         int r;
 203
 204         assert(b);
 205
 206         if (b->fd >= 0) {
 207                 close(b->fd);
 208                 b->fd = -1;
 209         }
 210
 211         p = strappenda("/dev/input/", b->name);
 212
 213         b->fd = open(p, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
 214         if (b->fd < 0) {
 215                 log_warning("Failed to open %s: %m", b->name);
 216                 return -errno;
 217         }
 218
 219         if (ioctl(b->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
 220                 log_error("Failed to get input name: %m");
 221                 r = -errno;
 222                 goto fail;
 223         }
 224
 225         r = sd_event_add_io(b->manager->event, b->fd, EPOLLIN, button_dispatch, b, &b->event_source);
 226         if (r < 0) {
 227                 log_error("Failed to add button event: %s", strerror(-r));
 228                 goto fail;
 229         }
 230
 231         log_info("Watching system buttons on /dev/input/%s (%s)", b->name, name);
 232
 233         return 0;
 234
 235 fail:
 236         close(b->fd);
 237         b->fd = -1;
 238         return r;
 239 }
 240
 241 int button_recheck(Button *b) {
 242         assert(b);
 243
 244         if (!b->lid_close_queued)
 245                 return 0;
 246
 247         return button_handle(b, INHIBIT_HANDLE_LID_SWITCH, b->manager->handle_lid_switch, b->manager->lid_switch_ignore_inhibited, false);
 248 }