X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flogin%2Flogind-button.c;h=e53dd63c29756e79088cf83c70f9dd361ffd2bbf;hp=d023294a5919b9bc1477674b8d58b8a15ac4c70b;hb=d5673993ad3bf38d0aeba8dbd025d6f4527f0169;hpb=0d0f0c50d3a1d90f03972a6abb82e6413daaa583

diff --git a/src/login/logind-button.c b/src/login/logind-button.c
index d023294a5..e53dd63c2 100644
--- a/src/login/logind-button.c
+++ b/src/login/logind-button.c
@@ -1,5 +1,3 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
 /***
   This file is part of systemd.
 
@@ -19,20 +17,32 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include <assert.h>
-#include <string.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <string.h>
 #include <sys/ioctl.h>
 #include <unistd.h>
 #include <linux/input.h>
-#include <sys/epoll.h>
 
-#include "conf-parser.h"
-#include "util.h"
+#include "sd-messages.h"
+
+#include "alloc-util.h"
+#include "fd-util.h"
 #include "logind-button.h"
-#include "special.h"
-#include "dbus-common.h"
+#include "string-util.h"
+#include "util.h"
+
+#define CONST_MAX4(a, b, c, d) CONST_MAX(CONST_MAX(a, b), CONST_MAX(c, d))
+
+#define ULONG_BITS (sizeof(unsigned long)*8)
+
+static bool bitset_get(const unsigned long *bits, unsigned i) {
+        return (bits[i / ULONG_BITS] >> (i % ULONG_BITS)) & 1UL;
+}
+
+static void bitset_put(unsigned long *bits, unsigned i) {
+        bits[i / ULONG_BITS] |= (unsigned long) 1 << (i % ULONG_BITS);
+}
 
 Button* button_new(Manager *m, const char *name) {
         Button *b;
@@ -45,15 +55,12 @@ Button* button_new(Manager *m, const char *name) {
                 return NULL;
 
         b->name = strdup(name);
-        if (!b->name) {
-                free(b);
-                return NULL;
-        }
+        if (!b->name)
+                return mfree(b);
 
         if (hashmap_put(m->buttons, b->name, b) < 0) {
                 free(b->name);
-                free(b);
-                return NULL;
+                return mfree(b);
         }
 
         b->manager = m;
@@ -67,11 +74,14 @@ void button_free(Button *b) {
 
         hashmap_remove(b->manager->buttons, b->name);
 
-        if (b->fd >= 0) {
-                hashmap_remove(b->manager->button_fds, INT_TO_PTR(b->fd + 1));
-                assert_se(epoll_ctl(b->manager->epoll_fd, EPOLL_CTL_DEL, b->fd, NULL) == 0);
-                close_nointr_nofail(b->fd);
-        }
+        sd_event_source_unref(b->io_event_source);
+        sd_event_source_unref(b->check_event_source);
+
+        if (b->fd >= 0)
+                /* If the device has been unplugged close() returns
+                 * ENODEV, let's ignore this, hence we don't use
+                 * safe_close() */
+                (void) close(b->fd);
 
         free(b->name);
         free(b->seat);
@@ -94,235 +104,293 @@ int button_set_seat(Button *b, const char *sn) {
         return 0;
 }
 
-int button_open(Button *b) {
-        char name[256], *p;
-        struct epoll_event ev;
-        int r;
+static void button_lid_switch_handle_action(Manager *manager, bool is_edge) {
+        HandleAction handle_action;
 
-        assert(b);
+        assert(manager);
 
-        if (b->fd >= 0) {
-                close_nointr_nofail(b->fd);
-                b->fd = -1;
-        }
+        /* If we are docked, handle the lid switch differently */
+        if (manager_is_docked_or_external_displays(manager))
+                handle_action = manager->handle_lid_switch_docked;
+        else
+                handle_action = manager->handle_lid_switch;
 
-        p = strappend("/dev/input/", b->name);
-        if (!p)
-                return log_oom();
+        manager_handle_action(manager, INHIBIT_HANDLE_LID_SWITCH, handle_action, manager->lid_switch_ignore_inhibited, is_edge);
+}
 
-        b->fd = open(p, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
-        free(p);
-        if (b->fd < 0) {
-                log_warning("Failed to open %s: %m", b->name);
-                return -errno;
-        }
+static int button_recheck(sd_event_source *e, void *userdata) {
+        Button *b = userdata;
 
-        if (ioctl(b->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
-                log_error("Failed to get input name: %m");
-                r = -errno;
-                goto fail;
-        }
+        assert(b);
+        assert(b->lid_closed);
 
-        zero(ev);
-        ev.events = EPOLLIN;
-        ev.data.u32 = FD_OTHER_BASE + b->fd;
+        button_lid_switch_handle_action(b->manager, false);
+        return 1;
+}
 
-        if (epoll_ctl(b->manager->epoll_fd, EPOLL_CTL_ADD, b->fd, &ev) < 0) {
-                log_error("Failed to add to epoll: %m");
-                r = -errno;
-                goto fail;
-        }
+static int button_install_check_event_source(Button *b) {
+        int r;
+        assert(b);
 
-        r = hashmap_put(b->manager->button_fds, INT_TO_PTR(b->fd + 1), b);
-        if (r < 0) {
-                log_error("Failed to add to hash map: %s", strerror(-r));
-                assert_se(epoll_ctl(b->manager->epoll_fd, EPOLL_CTL_DEL, b->fd, NULL) == 0);
-                goto fail;
-        }
+        /* Install a post handler, so that we keep rechecking as long as the lid is closed. */
 
-        log_info("Watching system buttons on /dev/input/%s (%s)", b->name, name);
+        if (b->check_event_source)
+                return 0;
 
-        return 0;
+        r = sd_event_add_post(b->manager->event, &b->check_event_source, button_recheck, b);
+        if (r < 0)
+                return r;
 
-fail:
-        close_nointr_nofail(b->fd);
-        b->fd = -1;
-        return r;
+        return sd_event_source_set_priority(b->check_event_source, SD_EVENT_PRIORITY_IDLE+1);
 }
 
-static Session *button_get_session(Button *b) {
-        Seat *seat;
+static int button_dispatch(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+        Button *b = userdata;
+        struct input_event ev;
+        ssize_t l;
+
+        assert(s);
+        assert(fd == b->fd);
         assert(b);
 
-        if (!b->seat)
-                return NULL;
+        l = read(b->fd, &ev, sizeof(ev));
+        if (l < 0)
+                return errno != EAGAIN ? -errno : 0;
+        if ((size_t) l < sizeof(ev))
+                return -EIO;
 
-        seat = hashmap_get(b->manager->seats, b->seat);
-        if (!seat)
-                return NULL;
+        if (ev.type == EV_KEY && ev.value > 0) {
 
-        return seat->active;
-}
+                switch (ev.code) {
 
-static int button_power_off(Button *b, HandleButton handle) {
-        DBusError error;
-        int r;
+                case KEY_POWER:
+                case KEY_POWER2:
+                        log_struct(LOG_INFO,
+                                   LOG_MESSAGE("Power key pressed."),
+                                   "MESSAGE_ID=" SD_MESSAGE_POWER_KEY_STR,
+                                   NULL);
 
-        assert(b);
+                        manager_handle_action(b->manager, INHIBIT_HANDLE_POWER_KEY, b->manager->handle_power_key, b->manager->power_key_ignore_inhibited, true);
+                        break;
 
-        if (handle == HANDLE_OFF)
-                return 0;
+                /* The kernel is a bit confused here:
 
-        if (handle == HANDLE_NO_SESSION) {
-                if (hashmap_size(b->manager->sessions) > 0) {
-                        log_error("Refusing power-off, user is logged in.");
-                        warn_melody();
-                        return -EPERM;
-                }
+                   KEY_SLEEP   = suspend-to-ram, which everybody else calls "suspend"
+                   KEY_SUSPEND = suspend-to-disk, which everybody else calls "hibernate"
+                */
 
-        } else if (handle == HANDLE_TTY_SESSION ||
-                   handle == HANDLE_ANY_SESSION) {
-                unsigned n;
-                Session *s;
+                case KEY_SLEEP:
+                        log_struct(LOG_INFO,
+                                   LOG_MESSAGE("Suspend key pressed."),
+                                   "MESSAGE_ID=" SD_MESSAGE_SUSPEND_KEY_STR,
+                                   NULL);
 
-                n = hashmap_size(b->manager->sessions);
-                s = button_get_session(b);
+                        manager_handle_action(b->manager, INHIBIT_HANDLE_SUSPEND_KEY, b->manager->handle_suspend_key, b->manager->suspend_key_ignore_inhibited, true);
+                        break;
 
-                /* Silently ignore events of graphical sessions */
-                if (handle == HANDLE_TTY_SESSION &&
-                    s && s->type == SESSION_X11)
-                        return 0;
+                case KEY_SUSPEND:
+                        log_struct(LOG_INFO,
+                                   LOG_MESSAGE("Hibernate key pressed."),
+                                   "MESSAGE_ID=" SD_MESSAGE_HIBERNATE_KEY_STR,
+                                   NULL);
 
-                if (n > 1 || (n == 1 && !s)) {
-                        log_error("Refusing power-off, other user is logged in.");
-                        warn_melody();
-                        return -EPERM;
+                        manager_handle_action(b->manager, INHIBIT_HANDLE_HIBERNATE_KEY, b->manager->handle_hibernate_key, b->manager->hibernate_key_ignore_inhibited, true);
+                        break;
                 }
 
-        }
+        } else if (ev.type == EV_SW && ev.value > 0) {
+
+                if (ev.code == SW_LID) {
+                        log_struct(LOG_INFO,
+                                   LOG_MESSAGE("Lid closed."),
+                                   "MESSAGE_ID=" SD_MESSAGE_LID_CLOSED_STR,
+                                   NULL);
 
-        if (handle != HANDLE_ALWAYS) {
-                if (manager_is_inhibited(b->manager, INHIBIT_SHUTDOWN, INHIBIT_BLOCK, NULL)) {
-                        log_error("Refusing power-off, shutdown is inhibited.");
-                        warn_melody();
-                        return -EPERM;
+                        b->lid_closed = true;
+                        button_lid_switch_handle_action(b->manager, true);
+                        button_install_check_event_source(b);
+
+                } else if (ev.code == SW_DOCK) {
+                        log_struct(LOG_INFO,
+                                   LOG_MESSAGE("System docked."),
+                                   "MESSAGE_ID=" SD_MESSAGE_SYSTEM_DOCKED_STR,
+                                   NULL);
+
+                        b->docked = true;
                 }
-        }
 
-        log_info("Powering off...");
+        } else if (ev.type == EV_SW && ev.value == 0) {
 
-        dbus_error_init(&error);
-        r = bus_manager_shutdown_or_sleep_now_or_later(b->manager, SPECIAL_POWEROFF_TARGET, INHIBIT_SHUTDOWN, &error);
-        if (r < 0) {
-                log_error("Failed to power off: %s", bus_error_message(&error));
-                dbus_error_free(&error);
+                if (ev.code == SW_LID) {
+                        log_struct(LOG_INFO,
+                                   LOG_MESSAGE("Lid opened."),
+                                   "MESSAGE_ID=" SD_MESSAGE_LID_OPENED_STR,
+                                   NULL);
+
+                        b->lid_closed = false;
+                        b->check_event_source = sd_event_source_unref(b->check_event_source);
+
+                } else if (ev.code == SW_DOCK) {
+                        log_struct(LOG_INFO,
+                                   LOG_MESSAGE("System undocked."),
+                                   "MESSAGE_ID=" SD_MESSAGE_SYSTEM_UNDOCKED_STR,
+                                   NULL);
+
+                        b->docked = false;
+                }
         }
 
-        return r;
+        return 0;
 }
 
-static int button_suspend(Button *b, HandleButton handle) {
-        DBusError error;
-        int r;
+static int button_suitable(Button *b) {
+        unsigned long types[CONST_MAX(EV_KEY, EV_SW)/ULONG_BITS+1];
 
         assert(b);
+        assert(b->fd);
 
-        if (handle == HANDLE_OFF)
-                return 0;
-
-        if (handle == HANDLE_NO_SESSION) {
-                if (hashmap_size(b->manager->sessions) > 0) {
-                        log_error("Refusing suspend, user is logged in.");
-                        warn_melody();
-                        return -EPERM;
-                }
-
-        } else if (handle == HANDLE_TTY_SESSION ||
-                   handle == HANDLE_ANY_SESSION) {
-                unsigned n;
-                Session *s;
+        if (ioctl(b->fd, EVIOCGBIT(EV_SYN, sizeof(types)), types) < 0)
+                return -errno;
 
-                n = hashmap_size(b->manager->sessions);
-                s = button_get_session(b);
+        if (bitset_get(types, EV_KEY)) {
+                unsigned long keys[CONST_MAX4(KEY_POWER, KEY_POWER2, KEY_SLEEP, KEY_SUSPEND)/ULONG_BITS+1];
 
-                /* Silently ignore events of graphical sessions */
-                if (handle == HANDLE_TTY_SESSION &&
-                    s && s->type == SESSION_X11)
-                        return 0;
+                if (ioctl(b->fd, EVIOCGBIT(EV_KEY, sizeof(keys)), keys) < 0)
+                        return -errno;
 
-                if (n > 1 || (n == 1 && !s)) {
-                        log_error("Refusing suspend, other user is logged in.");
-                        warn_melody();
-                        return -EPERM;
-                }
+                if (bitset_get(keys, KEY_POWER) ||
+                    bitset_get(keys, KEY_POWER2) ||
+                    bitset_get(keys, KEY_SLEEP) ||
+                    bitset_get(keys, KEY_SUSPEND))
+                        return true;
         }
 
-        if (handle != HANDLE_ALWAYS) {
-                if (manager_is_inhibited(b->manager, INHIBIT_SLEEP, INHIBIT_BLOCK, NULL)) {
-                        log_error("Refusing suspend, sleeping is inhibited.");
-                        warn_melody();
-                        return -EPERM;
-                }
-        }
+        if (bitset_get(types, EV_SW)) {
+                unsigned long switches[CONST_MAX(SW_LID, SW_DOCK)/ULONG_BITS+1];
 
-        log_info("Suspending...");
+                if (ioctl(b->fd, EVIOCGBIT(EV_SW, sizeof(switches)), switches) < 0)
+                        return -errno;
 
-        dbus_error_init(&error);
-        r = bus_manager_shutdown_or_sleep_now_or_later(b->manager, SPECIAL_SUSPEND_TARGET, INHIBIT_SLEEP, &error);
-        if (r < 0) {
-                log_error("Failed to suspend: %s", bus_error_message(&error));
-                dbus_error_free(&error);
+                if (bitset_get(switches, SW_LID) ||
+                    bitset_get(switches, SW_DOCK))
+                        return true;
         }
 
-        return r;
+        return false;
 }
 
-int button_process(Button *b) {
-        struct input_event ev;
-        ssize_t l;
+static int button_set_mask(Button *b) {
+        unsigned long
+                types[CONST_MAX(EV_KEY, EV_SW)/ULONG_BITS+1] = {},
+                keys[CONST_MAX4(KEY_POWER, KEY_POWER2, KEY_SLEEP, KEY_SUSPEND)/ULONG_BITS+1] = {},
+                switches[CONST_MAX(SW_LID, SW_DOCK)/ULONG_BITS+1] = {};
+        struct input_mask mask;
 
         assert(b);
+        assert(b->fd >= 0);
 
-        l = read(b->fd, &ev, sizeof(ev));
-        if (l < 0)
-                return errno != EAGAIN ? -errno : 0;
-        if ((size_t) l < sizeof(ev))
-                return -EIO;
+        bitset_put(types, EV_KEY);
+        bitset_put(types, EV_SW);
 
-        if (ev.type == EV_KEY && ev.value > 0) {
+        mask = (struct input_mask) {
+                .type = EV_SYN,
+                .codes_size = sizeof(types),
+                .codes_ptr = PTR_TO_UINT64(types),
+        };
 
-                switch (ev.code) {
+        if (ioctl(b->fd, EVIOCSMASK, &mask) < 0)
+                /* Log only at debug level if the kernel doesn't do EVIOCSMASK yet */
+                return log_full_errno(IN_SET(errno, ENOTTY, EOPNOTSUPP, EINVAL) ? LOG_DEBUG : LOG_WARNING,
+                                      errno, "Failed to set EV_SYN event mask on /dev/input/%s: %m", b->name);
 
-                case KEY_POWER:
-                case KEY_POWER2:
-                        log_info("Power key pressed.");
-                        return button_power_off(b, b->manager->handle_power_key);
+        bitset_put(keys, KEY_POWER);
+        bitset_put(keys, KEY_POWER2);
+        bitset_put(keys, KEY_SLEEP);
+        bitset_put(keys, KEY_SUSPEND);
 
-                case KEY_SLEEP:
-                case KEY_SUSPEND:
-                        log_info("Sleep key pressed.");
-                        return button_suspend(b, b->manager->handle_sleep_key);
+        mask = (struct input_mask) {
+                .type = EV_KEY,
+                .codes_size = sizeof(keys),
+                .codes_ptr = PTR_TO_UINT64(keys),
+        };
 
-                }
-        } else if (ev.type == EV_SW && ev.value > 0) {
+        if (ioctl(b->fd, EVIOCSMASK, &mask) < 0)
+                return log_warning_errno(errno, "Failed to set EV_KEY event mask on /dev/input/%s: %m", b->name);
 
-                switch (ev.code) {
+        bitset_put(switches, SW_LID);
+        bitset_put(switches, SW_DOCK);
 
-                case SW_LID:
-                        log_info("Lid closed.");
-                        return button_suspend(b, b->manager->handle_lid_switch);
-                }
+        mask = (struct input_mask) {
+                .type = EV_SW,
+                .codes_size = sizeof(switches),
+                .codes_ptr = PTR_TO_UINT64(switches),
+        };
+
+        if (ioctl(b->fd, EVIOCSMASK, &mask) < 0)
+                return log_warning_errno(errno, "Failed to set EV_SW event mask on /dev/input/%s: %m", b->name);
+
+        return 0;
+}
+
+int button_open(Button *b) {
+        char *p, name[256];
+        int r;
+
+        assert(b);
+
+        b->fd = safe_close(b->fd);
+
+        p = strjoina("/dev/input/", b->name);
+
+        b->fd = open(p, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
+        if (b->fd < 0)
+                return log_warning_errno(errno, "Failed to open %s: %m", p);
+
+        r = button_suitable(b);
+        if (r < 0)
+                return log_warning_errno(r, "Failed to determine whether input device is relevant to us: %m");
+        if (r == 0) {
+                log_debug("Device %s does not expose keys or switches relevant to us, ignoring.", p);
+                return -EADDRNOTAVAIL;
         }
 
+        if (ioctl(b->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
+                r = log_error_errno(errno, "Failed to get input name: %m");
+                goto fail;
+        }
+
+        (void) button_set_mask(b);
+
+        r = sd_event_add_io(b->manager->event, &b->io_event_source, b->fd, EPOLLIN, button_dispatch, b);
+        if (r < 0) {
+                log_error_errno(r, "Failed to add button event: %m");
+                goto fail;
+        }
+
+        log_info("Watching system buttons on /dev/input/%s (%s)", b->name, name);
+
         return 0;
+
+fail:
+        b->fd = safe_close(b->fd);
+        return r;
 }
 
-static const char* const handle_button_table[_HANDLE_BUTTON_MAX] = {
-        [HANDLE_OFF] = "off",
-        [HANDLE_NO_SESSION] = "no-session",
-        [HANDLE_TTY_SESSION] = "tty-session",
-        [HANDLE_ANY_SESSION] = "any-session",
-        [HANDLE_ALWAYS] = "always"
-};
-DEFINE_STRING_TABLE_LOOKUP(handle_button, HandleButton);
-DEFINE_CONFIG_PARSE_ENUM(config_parse_handle_button, handle_button, HandleButton, "Failed to parse handle button setting");
+int button_check_switches(Button *b) {
+        unsigned long switches[CONST_MAX(SW_LID, SW_DOCK)/ULONG_BITS+1] = {};
+        assert(b);
+
+        if (b->fd < 0)
+                return -EINVAL;
+
+        if (ioctl(b->fd, EVIOCGSW(sizeof(switches)), switches) < 0)
+                return -errno;
+
+        b->lid_closed = bitset_get(switches, SW_LID);
+        b->docked = bitset_get(switches, SW_DOCK);
+
+        if (b->lid_closed)
+                button_install_check_event_source(b);
+
+        return 0;
+}