diff options
Diffstat (limited to 'src/login/logind-inhibit.c')
| -rw-r--r-- | src/login/logind-inhibit.c | 468 |
1 files changed, 468 insertions, 0 deletions
diff --git a/src/login/logind-inhibit.c b/src/login/logind-inhibit.c new file mode 100644 index 0000000000..f1b9cca834 --- /dev/null +++ b/src/login/logind-inhibit.c @@ -0,0 +1,468 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2012 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <errno.h> +#include <fcntl.h> +#include <sys/epoll.h> +#include <string.h> +#include <errno.h> +#include <unistd.h> + +#include "util.h" +#include "mkdir.h" +#include "path-util.h" +#include "logind-inhibit.h" + +Inhibitor* inhibitor_new(Manager *m, const char* id) { + Inhibitor *i; + + assert(m); + + i = new0(Inhibitor, 1); + if (!i) + return NULL; + + i->state_file = strappend("/run/systemd/inhibit/", id); + if (!i->state_file) { + free(i); + return NULL; + } + + i->id = path_get_file_name(i->state_file); + + if (hashmap_put(m->inhibitors, i->id, i) < 0) { + free(i->state_file); + free(i); + return NULL; + } + + i->manager = m; + i->fifo_fd = -1; + + return i; +} + +void inhibitor_free(Inhibitor *i) { + assert(i); + + free(i->who); + free(i->why); + + hashmap_remove(i->manager->inhibitors, i->id); + inhibitor_remove_fifo(i); + + if (i->state_file) { + unlink(i->state_file); + free(i->state_file); + } + + free(i); +} + +int inhibitor_save(Inhibitor *i) { + char *temp_path, *cc; + int r; + FILE *f; + + assert(i); + + r = mkdir_safe_label("/run/systemd/inhibit", 0755, 0, 0); + if (r < 0) + goto finish; + + r = fopen_temporary(i->state_file, &f, &temp_path); + if (r < 0) + goto finish; + + fchmod(fileno(f), 0644); + + fprintf(f, + "# This is private data. Do not parse.\n" + "WHAT=%s\n" + "MODE=%s\n" + "UID=%lu\n" + "PID=%lu\n", + inhibit_what_to_string(i->what), + inhibit_mode_to_string(i->mode), + (unsigned long) i->uid, + (unsigned long) i->pid); + + if (i->who) { + cc = cescape(i->who); + if (!cc) + r = -ENOMEM; + else { + fprintf(f, "WHO=%s\n", cc); + free(cc); + } + } + + if (i->why) { + cc = cescape(i->why); + if (!cc) + r = -ENOMEM; + else { + fprintf(f, "WHY=%s\n", cc); + free(cc); + } + } + + if (i->fifo_path) + fprintf(f, "FIFO=%s\n", i->fifo_path); + + fflush(f); + + if (ferror(f) || rename(temp_path, i->state_file) < 0) { + r = -errno; + unlink(i->state_file); + unlink(temp_path); + } + + fclose(f); + free(temp_path); + +finish: + if (r < 0) + log_error("Failed to save inhibit data for %s: %s", i->id, strerror(-r)); + + return r; +} + +int inhibitor_start(Inhibitor *i) { + assert(i); + + if (i->started) + return 0; + + dual_timestamp_get(&i->since); + + log_debug("Inhibitor %s (%s) pid=%lu uid=%lu mode=%s started.", + strna(i->who), strna(i->why), + (unsigned long) i->pid, (unsigned long) i->uid, + inhibit_mode_to_string(i->mode)); + + inhibitor_save(i); + + i->started = true; + + manager_send_changed(i->manager, i->mode == INHIBIT_BLOCK ? "BlockInhibited\0" : "DelayInhibited\0"); + + return 0; +} + +int inhibitor_stop(Inhibitor *i) { + assert(i); + + if (i->started) + log_debug("Inhibitor %s (%s) pid=%lu uid=%lu mode=%s stopped.", + strna(i->who), strna(i->why), + (unsigned long) i->pid, (unsigned long) i->uid, + inhibit_mode_to_string(i->mode)); + + if (i->state_file) + unlink(i->state_file); + + i->started = false; + + manager_send_changed(i->manager, i->mode == INHIBIT_BLOCK ? "BlockInhibited\0" : "DelayInhibited\0"); + + return 0; +} + +int inhibitor_load(Inhibitor *i) { + InhibitWhat w; + InhibitMode mm; + int r; + char *cc, + *what = NULL, + *uid = NULL, + *pid = NULL, + *who = NULL, + *why = NULL, + *mode = NULL; + + r = parse_env_file(i->state_file, NEWLINE, + "WHAT", &what, + "UID", &uid, + "PID", &pid, + "WHO", &who, + "WHY", &why, + "MODE", &mode, + "FIFO", &i->fifo_path, + NULL); + if (r < 0) + goto finish; + + w = what ? inhibit_what_from_string(what) : 0; + if (w >= 0) + i->what = w; + + mm = mode ? inhibit_mode_from_string(mode) : INHIBIT_BLOCK; + if (mm >= 0) + i->mode = mm; + + if (uid) { + r = parse_uid(uid, &i->uid); + if (r < 0) + goto finish; + } + + if (pid) { + r = parse_pid(pid, &i->pid); + if (r < 0) + goto finish; + } + + if (who) { + cc = cunescape(who); + if (!cc) { + r = -ENOMEM; + goto finish; + } + + free(i->who); + i->who = cc; + } + + if (why) { + cc = cunescape(why); + if (!cc) { + r = -ENOMEM; + goto finish; + } + + free(i->why); + i->why = cc; + } + + if (i->fifo_path) { + int fd; + + fd = inhibitor_create_fifo(i); + if (fd >= 0) + close_nointr_nofail(fd); + } + +finish: + free(what); + free(uid); + free(pid); + free(who); + free(why); + + return r; +} + +int inhibitor_create_fifo(Inhibitor *i) { + int r; + + assert(i); + + /* Create FIFO */ + if (!i->fifo_path) { + r = mkdir_safe_label("/run/systemd/inhibit", 0755, 0, 0); + if (r < 0) + return r; + + if (asprintf(&i->fifo_path, "/run/systemd/inhibit/%s.ref", i->id) < 0) + return -ENOMEM; + + if (mkfifo(i->fifo_path, 0600) < 0 && errno != EEXIST) + return -errno; + } + + /* Open reading side */ + if (i->fifo_fd < 0) { + struct epoll_event ev; + + i->fifo_fd = open(i->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY); + if (i->fifo_fd < 0) + return -errno; + + r = hashmap_put(i->manager->inhibitor_fds, INT_TO_PTR(i->fifo_fd + 1), i); + if (r < 0) + return r; + + zero(ev); + ev.events = 0; + ev.data.u32 = FD_OTHER_BASE + i->fifo_fd; + + if (epoll_ctl(i->manager->epoll_fd, EPOLL_CTL_ADD, i->fifo_fd, &ev) < 0) + return -errno; + } + + /* Open writing side */ + r = open(i->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY); + if (r < 0) + return -errno; + + return r; +} + +void inhibitor_remove_fifo(Inhibitor *i) { + assert(i); + + if (i->fifo_fd >= 0) { + assert_se(hashmap_remove(i->manager->inhibitor_fds, INT_TO_PTR(i->fifo_fd + 1)) == i); + assert_se(epoll_ctl(i->manager->epoll_fd, EPOLL_CTL_DEL, i->fifo_fd, NULL) == 0); + close_nointr_nofail(i->fifo_fd); + i->fifo_fd = -1; + } + + if (i->fifo_path) { + unlink(i->fifo_path); + free(i->fifo_path); + i->fifo_path = NULL; + } +} + +InhibitWhat manager_inhibit_what(Manager *m, InhibitMode mm) { + Inhibitor *i; + Iterator j; + InhibitWhat what = 0; + + assert(m); + + HASHMAP_FOREACH(i, m->inhibitor_fds, j) + if (i->mode == mm) + what |= i->what; + + return what; +} + +static int pid_is_active(Manager *m, pid_t pid) { + Session *s; + int r; + + r = manager_get_session_by_pid(m, pid, &s); + if (r <= 0) + return r; + + return session_is_active(s); +} + +bool manager_is_inhibited( + Manager *m, + InhibitWhat w, + InhibitMode mm, + dual_timestamp *since, + bool ignore_inactive, + bool ignore_uid, + uid_t uid) { + + Inhibitor *i; + Iterator j; + struct dual_timestamp ts = { 0, 0 }; + bool inhibited = false; + + assert(m); + assert(w > 0 && w < _INHIBIT_WHAT_MAX); + + HASHMAP_FOREACH(i, m->inhibitor_fds, j) { + if (!(i->what & w)) + continue; + + if (i->mode != mm) + continue; + + if (ignore_inactive && pid_is_active(m, i->pid) <= 0) + continue; + + if (ignore_uid && i->uid == uid) + continue; + + if (!inhibited || + i->since.monotonic < ts.monotonic) + ts = i->since; + + inhibited = true; + } + + if (since) + *since = ts; + + return inhibited; +} + +const char *inhibit_what_to_string(InhibitWhat w) { + static __thread char buffer[97]; + char *p; + + if (w < 0 || w >= _INHIBIT_WHAT_MAX) + return NULL; + + p = buffer; + if (w & INHIBIT_SHUTDOWN) + p = stpcpy(p, "shutdown:"); + if (w & INHIBIT_SLEEP) + p = stpcpy(p, "sleep:"); + if (w & INHIBIT_IDLE) + p = stpcpy(p, "idle:"); + if (w & INHIBIT_HANDLE_POWER_KEY) + p = stpcpy(p, "handle-power-key:"); + if (w & INHIBIT_HANDLE_SUSPEND_KEY) + p = stpcpy(p, "handle-suspend-key:"); + if (w & INHIBIT_HANDLE_HIBERNATE_KEY) + p = stpcpy(p, "handle-hibernate-key:"); + if (w & INHIBIT_HANDLE_LID_SWITCH) + p = stpcpy(p, "handle-lid-switch:"); + + if (p > buffer) + *(p-1) = 0; + else + *p = 0; + + return buffer; +} + +InhibitWhat inhibit_what_from_string(const char *s) { + InhibitWhat what = 0; + char *w, *state; + size_t l; + + FOREACH_WORD_SEPARATOR(w, l, s, ":", state) { + if (l == 8 && strncmp(w, "shutdown", l) == 0) + what |= INHIBIT_SHUTDOWN; + else if (l == 5 && strncmp(w, "sleep", l) == 0) + what |= INHIBIT_SLEEP; + else if (l == 4 && strncmp(w, "idle", l) == 0) + what |= INHIBIT_IDLE; + else if (l == 16 && strncmp(w, "handle-power-key", l) == 0) + what |= INHIBIT_HANDLE_POWER_KEY; + else if (l == 18 && strncmp(w, "handle-suspend-key", l) == 0) + what |= INHIBIT_HANDLE_SUSPEND_KEY; + else if (l == 20 && strncmp(w, "handle-hibernate-key", l) == 0) + what |= INHIBIT_HANDLE_HIBERNATE_KEY; + else if (l == 17 && strncmp(w, "handle-lid-switch", l) == 0) + what |= INHIBIT_HANDLE_LID_SWITCH; + else + return _INHIBIT_WHAT_INVALID; + } + + return what; +} + +static const char* const inhibit_mode_table[_INHIBIT_MODE_MAX] = { + [INHIBIT_BLOCK] = "block", + [INHIBIT_DELAY] = "delay" +}; + +DEFINE_STRING_TABLE_LOOKUP(inhibit_mode, InhibitMode); |