+/*-*- 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 "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 = file_name_from_path(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 = safe_mkdir("/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"
+ "UID=%lu\n"
+ "PID=%lu\n",
+ inhibit_what_to_string(i->what),
+ (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;
+
+ log_debug("Inhibitor %s (%s) pid=%lu uid=%lu started.",
+ strna(i->who), strna(i->why),
+ (unsigned long) i->pid, (unsigned long) i->uid);
+
+ inhibitor_save(i);
+
+ i->started = true;
+
+ manager_send_changed(i->manager, "Inhibited\0");
+
+ return 0;
+}
+
+int inhibitor_stop(Inhibitor *i) {
+ assert(i);
+
+ if (i->started)
+ log_debug("Inhibitor %s (%s) pid=%lu uid=%lu stopped.",
+ strna(i->who), strna(i->why),
+ (unsigned long) i->pid, (unsigned long) i->uid);
+
+ if (i->state_file)
+ unlink(i->state_file);
+
+ i->started = false;
+
+ manager_send_changed(i->manager, "Inhibited\0");
+
+ return 0;
+}
+
+int inhibitor_load(Inhibitor *i) {
+ InhibitWhat w;
+ int r;
+ char *cc,
+ *what = NULL,
+ *uid = NULL,
+ *pid = NULL,
+ *who = NULL,
+ *why = NULL;
+
+ r = parse_env_file(i->state_file, NEWLINE,
+ "WHAT", &what,
+ "UID", &uid,
+ "PID", &pid,
+ "WHO", &who,
+ "WHY", &why,
+ "FIFO", &i->fifo_path,
+ NULL);
+ if (r < 0)
+ goto finish;
+
+ w = inhibit_what_from_string(what);
+ if (w >= 0)
+ i->what = w;
+
+ parse_uid(uid, &i->uid);
+ parse_pid(pid, &i->pid);
+
+ 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 = safe_mkdir("/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_FIFO_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) {
+ Inhibitor *i;
+ Iterator j;
+ InhibitWhat what = 0;
+
+ assert(m);
+
+ HASHMAP_FOREACH(i, m->inhibitor_fds, j)
+ what |= i->what;
+
+ return what;
+}
+
+const char *inhibit_what_to_string(InhibitWhat w) {
+
+ static const char* const table[_INHIBIT_WHAT_MAX] = {
+ [0] = "",
+ [INHIBIT_SHUTDOWN] = "shutdown",
+ [INHIBIT_SUSPEND] = "suspend",
+ [INHIBIT_IDLE] = "idle",
+ [INHIBIT_SHUTDOWN|INHIBIT_SUSPEND] = "shutdown:suspend",
+ [INHIBIT_SHUTDOWN|INHIBIT_IDLE] = "shutdown:idle",
+ [INHIBIT_SHUTDOWN|INHIBIT_SUSPEND|INHIBIT_IDLE] = "shutdown:suspend:idle",
+ [INHIBIT_SUSPEND|INHIBIT_IDLE] = "suspend:idle"
+ };
+
+ if (w < 0 || w >= _INHIBIT_WHAT_MAX)
+ return NULL;
+
+ return table[w];
+}
+
+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 == 7 && strncmp(w, "suspend", l) == 0)
+ what |= INHIBIT_SUSPEND;
+ else if (l == 4 && strncmp(w, "idle", l) == 0)
+ what |= INHIBIT_IDLE;
+ else
+ return _INHIBIT_WHAT_INVALID;
+ }
+
+ return what;
+
+}
~ianmdlvl / elogind.git / commitdiff