init.c revision 3e7b7739e3d4d7aaaa363645501036dafcc30ed3 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <stdio.h>
18#include <stdlib.h>
19#include <string.h>
20#include <unistd.h>
21#include <fcntl.h>
22#include <ctype.h>
23#include <signal.h>
24#include <sys/wait.h>
25#include <sys/mount.h>
26#include <sys/stat.h>
27#include <sys/poll.h>
28#include <errno.h>
29#include <stdarg.h>
30#include <mtd/mtd-user.h>
31#include <sys/types.h>
32#include <sys/socket.h>
33#include <sys/un.h>
34#include <libgen.h>
35
36#include <cutils/list.h>
37#include <cutils/sockets.h>
38#include <cutils/iosched_policy.h>
39#include <private/android_filesystem_config.h>
40#include <termios.h>
41
42#include <sys/system_properties.h>
43
44#include "devices.h"
45#include "init.h"
46#include "log.h"
47#include "property_service.h"
48#include "bootchart.h"
49#include "signal_handler.h"
50#include "keychords.h"
51#include "init_parser.h"
52#include "util.h"
53#include "ueventd.h"
54
55static int property_triggers_enabled = 0;
56
57#if BOOTCHART
58static int   bootchart_count;
59#endif
60
61static char console[32];
62static char serialno[32];
63static char bootmode[32];
64static char baseband[32];
65static char carrier[32];
66static char bootloader[32];
67static char hardware[32];
68static unsigned revision = 0;
69static char qemu[32];
70
71static struct action *cur_action = NULL;
72static struct command *cur_command = NULL;
73static struct listnode *command_queue = NULL;
74
75void notify_service_state(const char *name, const char *state)
76{
77    char pname[PROP_NAME_MAX];
78    int len = strlen(name);
79    if ((len + 10) > PROP_NAME_MAX)
80        return;
81    snprintf(pname, sizeof(pname), "init.svc.%s", name);
82    property_set(pname, state);
83}
84
85static int have_console;
86static char *console_name = "/dev/console";
87static time_t process_needs_restart;
88
89static const char *ENV[32];
90
91/* add_environment - add "key=value" to the current environment */
92int add_environment(const char *key, const char *val)
93{
94    int n;
95
96    for (n = 0; n < 31; n++) {
97        if (!ENV[n]) {
98            size_t len = strlen(key) + strlen(val) + 2;
99            char *entry = malloc(len);
100            snprintf(entry, len, "%s=%s", key, val);
101            ENV[n] = entry;
102            return 0;
103        }
104    }
105
106    return 1;
107}
108
109static void zap_stdio(void)
110{
111    int fd;
112    fd = open("/dev/null", O_RDWR);
113    dup2(fd, 0);
114    dup2(fd, 1);
115    dup2(fd, 2);
116    close(fd);
117}
118
119static void open_console()
120{
121    int fd;
122    if ((fd = open(console_name, O_RDWR)) < 0) {
123        fd = open("/dev/null", O_RDWR);
124    }
125    dup2(fd, 0);
126    dup2(fd, 1);
127    dup2(fd, 2);
128    close(fd);
129}
130
131static void publish_socket(const char *name, int fd)
132{
133    char key[64] = ANDROID_SOCKET_ENV_PREFIX;
134    char val[64];
135
136    strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1,
137            name,
138            sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX));
139    snprintf(val, sizeof(val), "%d", fd);
140    add_environment(key, val);
141
142    /* make sure we don't close-on-exec */
143    fcntl(fd, F_SETFD, 0);
144}
145
146void service_start(struct service *svc, const char *dynamic_args)
147{
148    struct stat s;
149    pid_t pid;
150    int needs_console;
151    int n;
152
153        /* starting a service removes it from the disabled or reset
154         * state and immediately takes it out of the restarting
155         * state if it was in there
156         */
157    svc->flags &= (~(SVC_DISABLED|SVC_RESTARTING|SVC_RESET));
158    svc->time_started = 0;
159
160        /* running processes require no additional work -- if
161         * they're in the process of exiting, we've ensured
162         * that they will immediately restart on exit, unless
163         * they are ONESHOT
164         */
165    if (svc->flags & SVC_RUNNING) {
166        return;
167    }
168
169    needs_console = (svc->flags & SVC_CONSOLE) ? 1 : 0;
170    if (needs_console && (!have_console)) {
171        ERROR("service '%s' requires console\n", svc->name);
172        svc->flags |= SVC_DISABLED;
173        return;
174    }
175
176    if (stat(svc->args[0], &s) != 0) {
177        ERROR("cannot find '%s', disabling '%s'\n", svc->args[0], svc->name);
178        svc->flags |= SVC_DISABLED;
179        return;
180    }
181
182    if ((!(svc->flags & SVC_ONESHOT)) && dynamic_args) {
183        ERROR("service '%s' must be one-shot to use dynamic args, disabling\n",
184               svc->args[0]);
185        svc->flags |= SVC_DISABLED;
186        return;
187    }
188
189    NOTICE("starting '%s'\n", svc->name);
190
191    pid = fork();
192
193    if (pid == 0) {
194        struct socketinfo *si;
195        struct svcenvinfo *ei;
196        char tmp[32];
197        int fd, sz;
198
199        if (properties_inited()) {
200            get_property_workspace(&fd, &sz);
201            sprintf(tmp, "%d,%d", dup(fd), sz);
202            add_environment("ANDROID_PROPERTY_WORKSPACE", tmp);
203        }
204
205        for (ei = svc->envvars; ei; ei = ei->next)
206            add_environment(ei->name, ei->value);
207
208        for (si = svc->sockets; si; si = si->next) {
209            int socket_type = (
210                    !strcmp(si->type, "stream") ? SOCK_STREAM :
211                        (!strcmp(si->type, "dgram") ? SOCK_DGRAM : SOCK_SEQPACKET));
212            int s = create_socket(si->name, socket_type,
213                                  si->perm, si->uid, si->gid);
214            if (s >= 0) {
215                publish_socket(si->name, s);
216            }
217        }
218
219        if (svc->ioprio_class != IoSchedClass_NONE) {
220            if (android_set_ioprio(getpid(), svc->ioprio_class, svc->ioprio_pri)) {
221                ERROR("Failed to set pid %d ioprio = %d,%d: %s\n",
222                      getpid(), svc->ioprio_class, svc->ioprio_pri, strerror(errno));
223            }
224        }
225
226        if (needs_console) {
227            setsid();
228            open_console();
229        } else {
230            zap_stdio();
231        }
232
233#if 0
234        for (n = 0; svc->args[n]; n++) {
235            INFO("args[%d] = '%s'\n", n, svc->args[n]);
236        }
237        for (n = 0; ENV[n]; n++) {
238            INFO("env[%d] = '%s'\n", n, ENV[n]);
239        }
240#endif
241
242        setpgid(0, getpid());
243
244    /* as requested, set our gid, supplemental gids, and uid */
245        if (svc->gid) {
246            if (setgid(svc->gid) != 0) {
247                ERROR("setgid failed: %s\n", strerror(errno));
248                _exit(127);
249            }
250        }
251        if (svc->nr_supp_gids) {
252            if (setgroups(svc->nr_supp_gids, svc->supp_gids) != 0) {
253                ERROR("setgroups failed: %s\n", strerror(errno));
254                _exit(127);
255            }
256        }
257        if (svc->uid) {
258            if (setuid(svc->uid) != 0) {
259                ERROR("setuid failed: %s\n", strerror(errno));
260                _exit(127);
261            }
262        }
263
264        if (!dynamic_args) {
265            if (execve(svc->args[0], (char**) svc->args, (char**) ENV) < 0) {
266                ERROR("cannot execve('%s'): %s\n", svc->args[0], strerror(errno));
267            }
268        } else {
269            char *arg_ptrs[INIT_PARSER_MAXARGS+1];
270            int arg_idx = svc->nargs;
271            char *tmp = strdup(dynamic_args);
272            char *next = tmp;
273            char *bword;
274
275            /* Copy the static arguments */
276            memcpy(arg_ptrs, svc->args, (svc->nargs * sizeof(char *)));
277
278            while((bword = strsep(&next, " "))) {
279                arg_ptrs[arg_idx++] = bword;
280                if (arg_idx == INIT_PARSER_MAXARGS)
281                    break;
282            }
283            arg_ptrs[arg_idx] = '\0';
284            execve(svc->args[0], (char**) arg_ptrs, (char**) ENV);
285        }
286        _exit(127);
287    }
288
289    if (pid < 0) {
290        ERROR("failed to start '%s'\n", svc->name);
291        svc->pid = 0;
292        return;
293    }
294
295    svc->time_started = gettime();
296    svc->pid = pid;
297    svc->flags |= SVC_RUNNING;
298
299    if (properties_inited())
300        notify_service_state(svc->name, "running");
301}
302
303/* The how field should be either SVC_DISABLED or SVC_RESET */
304static void service_stop_or_reset(struct service *svc, int how)
305{
306        /* we are no longer running, nor should we
307         * attempt to restart
308         */
309    svc->flags &= (~(SVC_RUNNING|SVC_RESTARTING));
310
311    if ((how != SVC_DISABLED) && (how != SVC_RESET)) {
312        /* Hrm, an illegal flag.  Default to SVC_DISABLED */
313        how = SVC_DISABLED;
314    }
315        /* if the service has not yet started, prevent
316         * it from auto-starting with its class
317         */
318    if (how == SVC_RESET) {
319        svc->flags |= (svc->flags & SVC_RC_DISABLED) ? SVC_DISABLED : SVC_RESET;
320    } else {
321        svc->flags |= how;
322    }
323
324    if (svc->pid) {
325        NOTICE("service '%s' is being killed\n", svc->name);
326        kill(-svc->pid, SIGKILL);
327        notify_service_state(svc->name, "stopping");
328    } else {
329        notify_service_state(svc->name, "stopped");
330    }
331}
332
333void service_reset(struct service *svc)
334{
335    service_stop_or_reset(svc, SVC_RESET);
336}
337
338void service_stop(struct service *svc)
339{
340    service_stop_or_reset(svc, SVC_DISABLED);
341}
342
343void property_changed(const char *name, const char *value)
344{
345    if (property_triggers_enabled)
346        queue_property_triggers(name, value);
347}
348
349static void restart_service_if_needed(struct service *svc)
350{
351    time_t next_start_time = svc->time_started + 5;
352
353    if (next_start_time <= gettime()) {
354        svc->flags &= (~SVC_RESTARTING);
355        service_start(svc, NULL);
356        return;
357    }
358
359    if ((next_start_time < process_needs_restart) ||
360        (process_needs_restart == 0)) {
361        process_needs_restart = next_start_time;
362    }
363}
364
365static void restart_processes()
366{
367    process_needs_restart = 0;
368    service_for_each_flags(SVC_RESTARTING,
369                           restart_service_if_needed);
370}
371
372static void msg_start(const char *name)
373{
374    struct service *svc;
375    char *tmp = NULL;
376    char *args = NULL;
377
378    if (!strchr(name, ':'))
379        svc = service_find_by_name(name);
380    else {
381        tmp = strdup(name);
382        args = strchr(tmp, ':');
383        *args = '\0';
384        args++;
385
386        svc = service_find_by_name(tmp);
387    }
388
389    if (svc) {
390        service_start(svc, args);
391    } else {
392        ERROR("no such service '%s'\n", name);
393    }
394    if (tmp)
395        free(tmp);
396}
397
398static void msg_stop(const char *name)
399{
400    struct service *svc = service_find_by_name(name);
401
402    if (svc) {
403        service_stop(svc);
404    } else {
405        ERROR("no such service '%s'\n", name);
406    }
407}
408
409void handle_control_message(const char *msg, const char *arg)
410{
411    if (!strcmp(msg,"start")) {
412        msg_start(arg);
413    } else if (!strcmp(msg,"stop")) {
414        msg_stop(arg);
415    } else if (!strcmp(msg,"restart")) {
416        msg_stop(arg);
417        msg_start(arg);
418    } else {
419        ERROR("unknown control msg '%s'\n", msg);
420    }
421}
422
423static void import_kernel_nv(char *name, int in_qemu)
424{
425    char *value = strchr(name, '=');
426
427    if (value == 0) return;
428    *value++ = 0;
429    if (*name == 0) return;
430
431    if (!in_qemu)
432    {
433        /* on a real device, white-list the kernel options */
434        if (!strcmp(name,"qemu")) {
435            strlcpy(qemu, value, sizeof(qemu));
436        } else if (!strcmp(name,"androidboot.console")) {
437            strlcpy(console, value, sizeof(console));
438        } else if (!strcmp(name,"androidboot.mode")) {
439            strlcpy(bootmode, value, sizeof(bootmode));
440        } else if (!strcmp(name,"androidboot.serialno")) {
441            strlcpy(serialno, value, sizeof(serialno));
442        } else if (!strcmp(name,"androidboot.baseband")) {
443            strlcpy(baseband, value, sizeof(baseband));
444        } else if (!strcmp(name,"androidboot.carrier")) {
445            strlcpy(carrier, value, sizeof(carrier));
446        } else if (!strcmp(name,"androidboot.bootloader")) {
447            strlcpy(bootloader, value, sizeof(bootloader));
448        } else if (!strcmp(name,"androidboot.hardware")) {
449            strlcpy(hardware, value, sizeof(hardware));
450        }
451    } else {
452        /* in the emulator, export any kernel option with the
453         * ro.kernel. prefix */
454        char  buff[32];
455        int   len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name );
456        if (len < (int)sizeof(buff)) {
457            property_set( buff, value );
458        }
459    }
460}
461
462static struct command *get_first_command(struct action *act)
463{
464    struct listnode *node;
465    node = list_head(&act->commands);
466    if (!node || list_empty(&act->commands))
467        return NULL;
468
469    return node_to_item(node, struct command, clist);
470}
471
472static struct command *get_next_command(struct action *act, struct command *cmd)
473{
474    struct listnode *node;
475    node = cmd->clist.next;
476    if (!node)
477        return NULL;
478    if (node == &act->commands)
479        return NULL;
480
481    return node_to_item(node, struct command, clist);
482}
483
484static int is_last_command(struct action *act, struct command *cmd)
485{
486    return (list_tail(&act->commands) == &cmd->clist);
487}
488
489void execute_one_command(void)
490{
491    int ret;
492
493    if (!cur_action || !cur_command || is_last_command(cur_action, cur_command)) {
494        cur_action = action_remove_queue_head();
495        cur_command = NULL;
496        if (!cur_action)
497            return;
498        INFO("processing action %p (%s)\n", cur_action, cur_action->name);
499        cur_command = get_first_command(cur_action);
500    } else {
501        cur_command = get_next_command(cur_action, cur_command);
502    }
503
504    if (!cur_command)
505        return;
506
507    ret = cur_command->func(cur_command->nargs, cur_command->args);
508    INFO("command '%s' r=%d\n", cur_command->args[0], ret);
509}
510
511static int wait_for_coldboot_done_action(int nargs, char **args)
512{
513    int ret;
514    INFO("wait for %s\n", coldboot_done);
515    ret = wait_for_file(coldboot_done, COMMAND_RETRY_TIMEOUT);
516    if (ret)
517        ERROR("Timed out waiting for %s\n", coldboot_done);
518    return ret;
519}
520
521static int keychord_init_action(int nargs, char **args)
522{
523    keychord_init();
524    return 0;
525}
526
527static int console_init_action(int nargs, char **args)
528{
529    int fd;
530    char tmp[PROP_VALUE_MAX];
531
532    if (console[0]) {
533        snprintf(tmp, sizeof(tmp), "/dev/%s", console);
534        console_name = strdup(tmp);
535    }
536
537    fd = open(console_name, O_RDWR);
538    if (fd >= 0)
539        have_console = 1;
540    close(fd);
541
542    if( load_565rle_image(INIT_IMAGE_FILE) ) {
543        fd = open("/dev/tty0", O_WRONLY);
544        if (fd >= 0) {
545            const char *msg;
546                msg = "\n"
547            "\n"
548            "\n"
549            "\n"
550            "\n"
551            "\n"
552            "\n"  // console is 40 cols x 30 lines
553            "\n"
554            "\n"
555            "\n"
556            "\n"
557            "\n"
558            "\n"
559            "\n"
560            "             A N D R O I D ";
561            write(fd, msg, strlen(msg));
562            close(fd);
563        }
564    }
565    return 0;
566}
567
568static int set_init_properties(void)
569{
570    char tmp[PROP_VALUE_MAX];
571
572    if (qemu[0])
573        import_kernel_cmdline(1, import_kernel_nv);
574
575    if (!strcmp(bootmode,"factory"))
576        property_set("ro.factorytest", "1");
577    else if (!strcmp(bootmode,"factory2"))
578        property_set("ro.factorytest", "2");
579    else
580        property_set("ro.factorytest", "0");
581
582    property_set("ro.serialno", serialno[0] ? serialno : "");
583    property_set("ro.bootmode", bootmode[0] ? bootmode : "unknown");
584    property_set("ro.baseband", baseband[0] ? baseband : "unknown");
585    property_set("ro.carrier", carrier[0] ? carrier : "unknown");
586    property_set("ro.bootloader", bootloader[0] ? bootloader : "unknown");
587
588    property_set("ro.hardware", hardware);
589    snprintf(tmp, PROP_VALUE_MAX, "%d", revision);
590    property_set("ro.revision", tmp);
591    return 0;
592}
593
594static int property_service_init_action(int nargs, char **args)
595{
596    /* read any property files on system or data and
597     * fire up the property service.  This must happen
598     * after the ro.foo properties are set above so
599     * that /data/local.prop cannot interfere with them.
600     */
601    start_property_service();
602    return 0;
603}
604
605static int signal_init_action(int nargs, char **args)
606{
607    signal_init();
608    return 0;
609}
610
611static int check_startup_action(int nargs, char **args)
612{
613    /* make sure we actually have all the pieces we need */
614    if ((get_property_set_fd() < 0) ||
615        (get_signal_fd() < 0)) {
616        ERROR("init startup failure\n");
617        exit(1);
618    }
619
620        /* signal that we hit this point */
621    unlink("/dev/.booting");
622
623    return 0;
624}
625
626static int queue_property_triggers_action(int nargs, char **args)
627{
628    queue_all_property_triggers();
629    /* enable property triggers */
630    property_triggers_enabled = 1;
631    return 0;
632}
633
634#if BOOTCHART
635static int bootchart_init_action(int nargs, char **args)
636{
637    bootchart_count = bootchart_init();
638    if (bootchart_count < 0) {
639        ERROR("bootcharting init failure\n");
640    } else if (bootchart_count > 0) {
641        NOTICE("bootcharting started (period=%d ms)\n", bootchart_count*BOOTCHART_POLLING_MS);
642    } else {
643        NOTICE("bootcharting ignored\n");
644    }
645
646    return 0;
647}
648#endif
649
650int main(int argc, char **argv)
651{
652    int fd_count = 0;
653    struct pollfd ufds[4];
654    char *tmpdev;
655    char* debuggable;
656    char tmp[32];
657    int property_set_fd_init = 0;
658    int signal_fd_init = 0;
659    int keychord_fd_init = 0;
660    bool is_charger = false;
661
662    if (!strcmp(basename(argv[0]), "ueventd"))
663        return ueventd_main(argc, argv);
664
665    /* clear the umask */
666    umask(0);
667
668        /* Get the basic filesystem setup we need put
669         * together in the initramdisk on / and then we'll
670         * let the rc file figure out the rest.
671         */
672    mkdir("/dev", 0755);
673    mkdir("/proc", 0755);
674    mkdir("/sys", 0755);
675
676    mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755");
677    mkdir("/dev/pts", 0755);
678    mkdir("/dev/socket", 0755);
679    mount("devpts", "/dev/pts", "devpts", 0, NULL);
680    mount("proc", "/proc", "proc", 0, NULL);
681    mount("sysfs", "/sys", "sysfs", 0, NULL);
682
683        /* indicate that booting is in progress to background fw loaders, etc */
684    close(open("/dev/.booting", O_WRONLY | O_CREAT, 0000));
685
686        /* We must have some place other than / to create the
687         * device nodes for kmsg and null, otherwise we won't
688         * be able to remount / read-only later on.
689         * Now that tmpfs is mounted on /dev, we can actually
690         * talk to the outside world.
691         */
692    open_devnull_stdio();
693    klog_init();
694
695    /* don't expose the raw commandline to nonpriv processes */
696    chmod("/proc/cmdline", 0440);
697    /* pull the kernel commandline and ramdisk properties file in */
698    import_kernel_cmdline(0, import_kernel_nv);
699    get_hardware_name(hardware, &revision);
700
701    is_charger = !strcmp(bootmode, "charger");
702
703    INFO("property init\n");
704    property_init(!is_charger);
705    set_init_properties();
706
707    INFO("reading config file\n");
708    init_parse_config_file("/init.rc");
709
710    action_for_each_trigger("early-init", action_add_queue_tail);
711
712    queue_builtin_action(wait_for_coldboot_done_action, "wait_for_coldboot_done");
713    queue_builtin_action(keychord_init_action, "keychord_init");
714    queue_builtin_action(console_init_action, "console_init");
715
716    /* execute all the boot actions to get us started */
717    action_for_each_trigger("init", action_add_queue_tail);
718
719    /* skip mounting filesystems in charger mode */
720    if (!is_charger) {
721        action_for_each_trigger("early-fs", action_add_queue_tail);
722        action_for_each_trigger("fs", action_add_queue_tail);
723        action_for_each_trigger("post-fs", action_add_queue_tail);
724        action_for_each_trigger("post-fs-data", action_add_queue_tail);
725    }
726
727    queue_builtin_action(property_service_init_action, "property_service_init");
728    queue_builtin_action(signal_init_action, "signal_init");
729    queue_builtin_action(check_startup_action, "check_startup");
730
731    if (is_charger) {
732        action_for_each_trigger("charger", action_add_queue_tail);
733    } else {
734        action_for_each_trigger("early-boot", action_add_queue_tail);
735        action_for_each_trigger("boot", action_add_queue_tail);
736    }
737
738        /* run all property triggers based on current state of the properties */
739    queue_builtin_action(queue_property_triggers_action, "queue_propety_triggers");
740
741
742#if BOOTCHART
743    queue_builtin_action(bootchart_init_action, "bootchart_init");
744#endif
745
746    for(;;) {
747        int nr, i, timeout = -1;
748
749        execute_one_command();
750        restart_processes();
751
752        if (!property_set_fd_init && get_property_set_fd() > 0) {
753            ufds[fd_count].fd = get_property_set_fd();
754            ufds[fd_count].events = POLLIN;
755            ufds[fd_count].revents = 0;
756            fd_count++;
757            property_set_fd_init = 1;
758        }
759        if (!signal_fd_init && get_signal_fd() > 0) {
760            ufds[fd_count].fd = get_signal_fd();
761            ufds[fd_count].events = POLLIN;
762            ufds[fd_count].revents = 0;
763            fd_count++;
764            signal_fd_init = 1;
765        }
766        if (!keychord_fd_init && get_keychord_fd() > 0) {
767            ufds[fd_count].fd = get_keychord_fd();
768            ufds[fd_count].events = POLLIN;
769            ufds[fd_count].revents = 0;
770            fd_count++;
771            keychord_fd_init = 1;
772        }
773
774        if (process_needs_restart) {
775            timeout = (process_needs_restart - gettime()) * 1000;
776            if (timeout < 0)
777                timeout = 0;
778        }
779
780        if (!action_queue_empty() || cur_action)
781            timeout = 0;
782
783#if BOOTCHART
784        if (bootchart_count > 0) {
785            if (timeout < 0 || timeout > BOOTCHART_POLLING_MS)
786                timeout = BOOTCHART_POLLING_MS;
787            if (bootchart_step() < 0 || --bootchart_count == 0) {
788                bootchart_finish();
789                bootchart_count = 0;
790            }
791        }
792#endif
793
794        nr = poll(ufds, fd_count, timeout);
795        if (nr <= 0)
796            continue;
797
798        for (i = 0; i < fd_count; i++) {
799            if (ufds[i].revents == POLLIN) {
800                if (ufds[i].fd == get_property_set_fd())
801                    handle_property_set_fd();
802                else if (ufds[i].fd == get_keychord_fd())
803                    handle_keychord();
804                else if (ufds[i].fd == get_signal_fd())
805                    handle_signal();
806            }
807        }
808    }
809
810    return 0;
811}
812