LCOV - code coverage report
Current view: top level - login - logind-button.c (source / functions) Hit Total Coverage
Test: main_coverage.info Lines: 0 187 0.0 %
Date: 2019-08-22 15:41:25 Functions: 0 13 0.0 %

          Line data    Source code
       1             : /* SPDX-License-Identifier: LGPL-2.1+ */
       2             : 
       3             : #include <errno.h>
       4             : #include <fcntl.h>
       5             : #include <string.h>
       6             : #include <sys/ioctl.h>
       7             : #include <unistd.h>
       8             : #include <linux/input.h>
       9             : 
      10             : #include "sd-messages.h"
      11             : 
      12             : #include "alloc-util.h"
      13             : #include "fd-util.h"
      14             : #include "logind-button.h"
      15             : #include "missing_input.h"
      16             : #include "string-util.h"
      17             : #include "util.h"
      18             : 
      19             : #define CONST_MAX4(a, b, c, d) CONST_MAX(CONST_MAX(a, b), CONST_MAX(c, d))
      20             : 
      21             : #define ULONG_BITS (sizeof(unsigned long)*8)
      22             : 
      23           0 : static bool bitset_get(const unsigned long *bits, unsigned i) {
      24           0 :         return (bits[i / ULONG_BITS] >> (i % ULONG_BITS)) & 1UL;
      25             : }
      26             : 
      27           0 : static void bitset_put(unsigned long *bits, unsigned i) {
      28           0 :         bits[i / ULONG_BITS] |= (unsigned long) 1 << (i % ULONG_BITS);
      29           0 : }
      30             : 
      31           0 : Button* button_new(Manager *m, const char *name) {
      32             :         Button *b;
      33             : 
      34           0 :         assert(m);
      35           0 :         assert(name);
      36             : 
      37           0 :         b = new0(Button, 1);
      38           0 :         if (!b)
      39           0 :                 return NULL;
      40             : 
      41           0 :         b->name = strdup(name);
      42           0 :         if (!b->name)
      43           0 :                 return mfree(b);
      44             : 
      45           0 :         if (hashmap_put(m->buttons, b->name, b) < 0) {
      46           0 :                 free(b->name);
      47           0 :                 return mfree(b);
      48             :         }
      49             : 
      50           0 :         b->manager = m;
      51           0 :         b->fd = -1;
      52             : 
      53           0 :         return b;
      54             : }
      55             : 
      56           0 : void button_free(Button *b) {
      57           0 :         assert(b);
      58             : 
      59           0 :         hashmap_remove(b->manager->buttons, b->name);
      60             : 
      61           0 :         sd_event_source_unref(b->io_event_source);
      62           0 :         sd_event_source_unref(b->check_event_source);
      63             : 
      64           0 :         if (b->fd >= 0)
      65             :                 /* If the device has been unplugged close() returns
      66             :                  * ENODEV, let's ignore this, hence we don't use
      67             :                  * safe_close() */
      68           0 :                 (void) close(b->fd);
      69             : 
      70           0 :         free(b->name);
      71           0 :         free(b->seat);
      72           0 :         free(b);
      73           0 : }
      74             : 
      75           0 : int button_set_seat(Button *b, const char *sn) {
      76             :         char *s;
      77             : 
      78           0 :         assert(b);
      79           0 :         assert(sn);
      80             : 
      81           0 :         s = strdup(sn);
      82           0 :         if (!s)
      83           0 :                 return -ENOMEM;
      84             : 
      85           0 :         free(b->seat);
      86           0 :         b->seat = s;
      87             : 
      88           0 :         return 0;
      89             : }
      90             : 
      91           0 : static void button_lid_switch_handle_action(Manager *manager, bool is_edge) {
      92             :         HandleAction handle_action;
      93             : 
      94           0 :         assert(manager);
      95             : 
      96             :         /* If we are docked or on external power, handle the lid switch
      97             :          * differently */
      98           0 :         if (manager_is_docked_or_external_displays(manager))
      99           0 :                 handle_action = manager->handle_lid_switch_docked;
     100           0 :         else if (manager->handle_lid_switch_ep != _HANDLE_ACTION_INVALID &&
     101           0 :                  manager_is_on_external_power())
     102           0 :                 handle_action = manager->handle_lid_switch_ep;
     103             :         else
     104           0 :                 handle_action = manager->handle_lid_switch;
     105             : 
     106           0 :         manager_handle_action(manager, INHIBIT_HANDLE_LID_SWITCH, handle_action, manager->lid_switch_ignore_inhibited, is_edge);
     107           0 : }
     108             : 
     109           0 : static int button_recheck(sd_event_source *e, void *userdata) {
     110           0 :         Button *b = userdata;
     111             : 
     112           0 :         assert(b);
     113           0 :         assert(b->lid_closed);
     114             : 
     115           0 :         button_lid_switch_handle_action(b->manager, false);
     116           0 :         return 1;
     117             : }
     118             : 
     119           0 : static int button_install_check_event_source(Button *b) {
     120             :         int r;
     121           0 :         assert(b);
     122             : 
     123             :         /* Install a post handler, so that we keep rechecking as long as the lid is closed. */
     124             : 
     125           0 :         if (b->check_event_source)
     126           0 :                 return 0;
     127             : 
     128           0 :         r = sd_event_add_post(b->manager->event, &b->check_event_source, button_recheck, b);
     129           0 :         if (r < 0)
     130           0 :                 return r;
     131             : 
     132           0 :         return sd_event_source_set_priority(b->check_event_source, SD_EVENT_PRIORITY_IDLE+1);
     133             : }
     134             : 
     135           0 : static int button_dispatch(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
     136           0 :         Button *b = userdata;
     137             :         struct input_event ev;
     138             :         ssize_t l;
     139             : 
     140           0 :         assert(s);
     141           0 :         assert(fd == b->fd);
     142           0 :         assert(b);
     143             : 
     144           0 :         l = read(b->fd, &ev, sizeof(ev));
     145           0 :         if (l < 0)
     146           0 :                 return errno != EAGAIN ? -errno : 0;
     147           0 :         if ((size_t) l < sizeof(ev))
     148           0 :                 return -EIO;
     149             : 
     150           0 :         if (ev.type == EV_KEY && ev.value > 0) {
     151             : 
     152           0 :                 switch (ev.code) {
     153             : 
     154           0 :                 case KEY_POWER:
     155             :                 case KEY_POWER2:
     156           0 :                         log_struct(LOG_INFO,
     157             :                                    LOG_MESSAGE("Power key pressed."),
     158             :                                    "MESSAGE_ID=" SD_MESSAGE_POWER_KEY_STR);
     159             : 
     160           0 :                         manager_handle_action(b->manager, INHIBIT_HANDLE_POWER_KEY, b->manager->handle_power_key, b->manager->power_key_ignore_inhibited, true);
     161           0 :                         break;
     162             : 
     163             :                 /* The kernel is a bit confused here:
     164             : 
     165             :                    KEY_SLEEP   = suspend-to-ram, which everybody else calls "suspend"
     166             :                    KEY_SUSPEND = suspend-to-disk, which everybody else calls "hibernate"
     167             :                 */
     168             : 
     169           0 :                 case KEY_SLEEP:
     170           0 :                         log_struct(LOG_INFO,
     171             :                                    LOG_MESSAGE("Suspend key pressed."),
     172             :                                    "MESSAGE_ID=" SD_MESSAGE_SUSPEND_KEY_STR);
     173             : 
     174           0 :                         manager_handle_action(b->manager, INHIBIT_HANDLE_SUSPEND_KEY, b->manager->handle_suspend_key, b->manager->suspend_key_ignore_inhibited, true);
     175           0 :                         break;
     176             : 
     177           0 :                 case KEY_SUSPEND:
     178           0 :                         log_struct(LOG_INFO,
     179             :                                    LOG_MESSAGE("Hibernate key pressed."),
     180             :                                    "MESSAGE_ID=" SD_MESSAGE_HIBERNATE_KEY_STR);
     181             : 
     182           0 :                         manager_handle_action(b->manager, INHIBIT_HANDLE_HIBERNATE_KEY, b->manager->handle_hibernate_key, b->manager->hibernate_key_ignore_inhibited, true);
     183           0 :                         break;
     184             :                 }
     185             : 
     186           0 :         } else if (ev.type == EV_SW && ev.value > 0) {
     187             : 
     188           0 :                 if (ev.code == SW_LID) {
     189           0 :                         log_struct(LOG_INFO,
     190             :                                    LOG_MESSAGE("Lid closed."),
     191             :                                    "MESSAGE_ID=" SD_MESSAGE_LID_CLOSED_STR);
     192             : 
     193           0 :                         b->lid_closed = true;
     194           0 :                         button_lid_switch_handle_action(b->manager, true);
     195           0 :                         button_install_check_event_source(b);
     196             : 
     197           0 :                 } else if (ev.code == SW_DOCK) {
     198           0 :                         log_struct(LOG_INFO,
     199             :                                    LOG_MESSAGE("System docked."),
     200             :                                    "MESSAGE_ID=" SD_MESSAGE_SYSTEM_DOCKED_STR);
     201             : 
     202           0 :                         b->docked = true;
     203             :                 }
     204             : 
     205           0 :         } else if (ev.type == EV_SW && ev.value == 0) {
     206             : 
     207           0 :                 if (ev.code == SW_LID) {
     208           0 :                         log_struct(LOG_INFO,
     209             :                                    LOG_MESSAGE("Lid opened."),
     210             :                                    "MESSAGE_ID=" SD_MESSAGE_LID_OPENED_STR);
     211             : 
     212           0 :                         b->lid_closed = false;
     213           0 :                         b->check_event_source = sd_event_source_unref(b->check_event_source);
     214             : 
     215           0 :                 } else if (ev.code == SW_DOCK) {
     216           0 :                         log_struct(LOG_INFO,
     217             :                                    LOG_MESSAGE("System undocked."),
     218             :                                    "MESSAGE_ID=" SD_MESSAGE_SYSTEM_UNDOCKED_STR);
     219             : 
     220           0 :                         b->docked = false;
     221             :                 }
     222             :         }
     223             : 
     224           0 :         return 0;
     225             : }
     226             : 
     227           0 : static int button_suitable(int fd) {
     228             :         unsigned long types[CONST_MAX(EV_KEY, EV_SW)/ULONG_BITS+1];
     229             : 
     230           0 :         assert(fd >= 0);
     231             : 
     232           0 :         if (ioctl(fd, EVIOCGBIT(EV_SYN, sizeof types), types) < 0)
     233           0 :                 return -errno;
     234             : 
     235           0 :         if (bitset_get(types, EV_KEY)) {
     236             :                 unsigned long keys[CONST_MAX4(KEY_POWER, KEY_POWER2, KEY_SLEEP, KEY_SUSPEND)/ULONG_BITS+1];
     237             : 
     238           0 :                 if (ioctl(fd, EVIOCGBIT(EV_KEY, sizeof keys), keys) < 0)
     239           0 :                         return -errno;
     240             : 
     241           0 :                 if (bitset_get(keys, KEY_POWER) ||
     242           0 :                     bitset_get(keys, KEY_POWER2) ||
     243           0 :                     bitset_get(keys, KEY_SLEEP) ||
     244           0 :                     bitset_get(keys, KEY_SUSPEND))
     245           0 :                         return true;
     246             :         }
     247             : 
     248           0 :         if (bitset_get(types, EV_SW)) {
     249             :                 unsigned long switches[CONST_MAX(SW_LID, SW_DOCK)/ULONG_BITS+1];
     250             : 
     251           0 :                 if (ioctl(fd, EVIOCGBIT(EV_SW, sizeof switches), switches) < 0)
     252           0 :                         return -errno;
     253             : 
     254           0 :                 if (bitset_get(switches, SW_LID) ||
     255           0 :                     bitset_get(switches, SW_DOCK))
     256           0 :                         return true;
     257             :         }
     258             : 
     259           0 :         return false;
     260             : }
     261             : 
     262           0 : static int button_set_mask(const char *name, int fd) {
     263             :         unsigned long
     264           0 :                 types[CONST_MAX(EV_KEY, EV_SW)/ULONG_BITS+1] = {},
     265           0 :                 keys[CONST_MAX4(KEY_POWER, KEY_POWER2, KEY_SLEEP, KEY_SUSPEND)/ULONG_BITS+1] = {},
     266           0 :                 switches[CONST_MAX(SW_LID, SW_DOCK)/ULONG_BITS+1] = {};
     267             :         struct input_mask mask;
     268             : 
     269           0 :         assert(name);
     270           0 :         assert(fd >= 0);
     271             : 
     272           0 :         bitset_put(types, EV_KEY);
     273           0 :         bitset_put(types, EV_SW);
     274             : 
     275           0 :         mask = (struct input_mask) {
     276             :                 .type = EV_SYN,
     277             :                 .codes_size = sizeof(types),
     278           0 :                 .codes_ptr = PTR_TO_UINT64(types),
     279             :         };
     280             : 
     281           0 :         if (ioctl(fd, EVIOCSMASK, &mask) < 0)
     282             :                 /* Log only at debug level if the kernel doesn't do EVIOCSMASK yet */
     283           0 :                 return log_full_errno(IN_SET(errno, ENOTTY, EOPNOTSUPP, EINVAL) ? LOG_DEBUG : LOG_WARNING,
     284             :                                       errno, "Failed to set EV_SYN event mask on /dev/input/%s: %m", name);
     285             : 
     286           0 :         bitset_put(keys, KEY_POWER);
     287           0 :         bitset_put(keys, KEY_POWER2);
     288           0 :         bitset_put(keys, KEY_SLEEP);
     289           0 :         bitset_put(keys, KEY_SUSPEND);
     290             : 
     291           0 :         mask = (struct input_mask) {
     292             :                 .type = EV_KEY,
     293             :                 .codes_size = sizeof(keys),
     294           0 :                 .codes_ptr = PTR_TO_UINT64(keys),
     295             :         };
     296             : 
     297           0 :         if (ioctl(fd, EVIOCSMASK, &mask) < 0)
     298           0 :                 return log_warning_errno(errno, "Failed to set EV_KEY event mask on /dev/input/%s: %m", name);
     299             : 
     300           0 :         bitset_put(switches, SW_LID);
     301           0 :         bitset_put(switches, SW_DOCK);
     302             : 
     303           0 :         mask = (struct input_mask) {
     304             :                 .type = EV_SW,
     305             :                 .codes_size = sizeof(switches),
     306           0 :                 .codes_ptr = PTR_TO_UINT64(switches),
     307             :         };
     308             : 
     309           0 :         if (ioctl(fd, EVIOCSMASK, &mask) < 0)
     310           0 :                 return log_warning_errno(errno, "Failed to set EV_SW event mask on /dev/input/%s: %m", name);
     311             : 
     312           0 :         return 0;
     313             : }
     314             : 
     315           0 : int button_open(Button *b) {
     316           0 :         _cleanup_close_ int fd = -1;
     317             :         const char *p;
     318             :         char name[256];
     319             :         int r;
     320             : 
     321           0 :         assert(b);
     322             : 
     323           0 :         b->fd = safe_close(b->fd);
     324             : 
     325           0 :         p = strjoina("/dev/input/", b->name);
     326             : 
     327           0 :         fd = open(p, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
     328           0 :         if (fd < 0)
     329           0 :                 return log_warning_errno(errno, "Failed to open %s: %m", p);
     330             : 
     331           0 :         r = button_suitable(fd);
     332           0 :         if (r < 0)
     333           0 :                 return log_warning_errno(r, "Failed to determine whether input device %s is relevant to us: %m", p);
     334           0 :         if (r == 0)
     335           0 :                 return log_debug_errno(SYNTHETIC_ERRNO(EADDRNOTAVAIL),
     336             :                                        "Device %s does not expose keys or switches relevant to us, ignoring.", p);
     337             : 
     338           0 :         if (ioctl(fd, EVIOCGNAME(sizeof name), name) < 0)
     339           0 :                 return log_error_errno(errno, "Failed to get input name for %s: %m", p);
     340             : 
     341           0 :         (void) button_set_mask(b->name, fd);
     342             : 
     343           0 :         b->io_event_source = sd_event_source_unref(b->io_event_source);
     344           0 :         r = sd_event_add_io(b->manager->event, &b->io_event_source, fd, EPOLLIN, button_dispatch, b);
     345           0 :         if (r < 0)
     346           0 :                 return log_error_errno(r, "Failed to add button event for %s: %m", p);
     347             : 
     348           0 :         b->fd = TAKE_FD(fd);
     349           0 :         log_info("Watching system buttons on %s (%s)", p, name);
     350           0 :         return 0;
     351             : }
     352             : 
     353           0 : int button_check_switches(Button *b) {
     354           0 :         unsigned long switches[CONST_MAX(SW_LID, SW_DOCK)/ULONG_BITS+1] = {};
     355           0 :         assert(b);
     356             : 
     357           0 :         if (b->fd < 0)
     358           0 :                 return -EINVAL;
     359             : 
     360           0 :         if (ioctl(b->fd, EVIOCGSW(sizeof(switches)), switches) < 0)
     361           0 :                 return -errno;
     362             : 
     363           0 :         b->lid_closed = bitset_get(switches, SW_LID);
     364           0 :         b->docked = bitset_get(switches, SW_DOCK);
     365             : 
     366           0 :         if (b->lid_closed)
     367           0 :                 button_install_check_event_source(b);
     368             : 
     369           0 :         return 0;
     370             : }

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