1 /*
2 * Copyright (C) 2010 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 <errno.h>
18 #include <fcntl.h>
19 #include <stdlib.h>
20 #include <string.h>
21 #include <sys/stat.h>
22 #include <sys/types.h>
23 #include <linux/keychord.h>
24 #include <unistd.h>
25
26 #include "init.h"
27 #include "log.h"
28 #include "property_service.h"
29 #include "service.h"
30
31 static struct input_keychord *keychords = 0;
32 static int keychords_count = 0;
33 static int keychords_length = 0;
34 static int keychord_fd = -1;
35
add_service_keycodes(Service * svc)36 void add_service_keycodes(Service* svc)
37 {
38 struct input_keychord *keychord;
39 size_t i, size;
40
41 if (!svc->keycodes().empty()) {
42 /* add a new keychord to the list */
43 size = sizeof(*keychord) + svc->keycodes().size() * sizeof(keychord->keycodes[0]);
44 keychords = (input_keychord*) realloc(keychords, keychords_length + size);
45 if (!keychords) {
46 ERROR("could not allocate keychords\n");
47 keychords_length = 0;
48 keychords_count = 0;
49 return;
50 }
51
52 keychord = (struct input_keychord *)((char *)keychords + keychords_length);
53 keychord->version = KEYCHORD_VERSION;
54 keychord->id = keychords_count + 1;
55 keychord->count = svc->keycodes().size();
56 svc->set_keychord_id(keychord->id);
57
58 for (i = 0; i < svc->keycodes().size(); i++) {
59 keychord->keycodes[i] = svc->keycodes()[i];
60 }
61 keychords_count++;
62 keychords_length += size;
63 }
64 }
65
handle_keychord()66 static void handle_keychord() {
67 int ret;
68 __u16 id;
69
70 ret = read(keychord_fd, &id, sizeof(id));
71 if (ret != sizeof(id)) {
72 ERROR("could not read keychord id\n");
73 return;
74 }
75
76 // Only handle keychords if adb is enabled.
77 std::string adb_enabled = property_get("init.svc.adbd");
78 if (adb_enabled == "running") {
79 Service* svc = ServiceManager::GetInstance().FindServiceByKeychord(id);
80 if (svc) {
81 NOTICE("Starting service '%s' from keychord %d\n", svc->name().c_str(), id);
82 svc->Start();
83 } else {
84 ERROR("Service for keychord %d not found\n", id);
85 }
86 } else {
87 WARNING("Not starting service for keychord %d because ADB is disabled\n", id);
88 }
89 }
90
keychord_init()91 void keychord_init() {
92 ServiceManager::GetInstance().ForEachService(add_service_keycodes);
93
94 // Nothing to do if no services require keychords.
95 if (!keychords) {
96 return;
97 }
98
99 keychord_fd = TEMP_FAILURE_RETRY(open("/dev/keychord", O_RDWR | O_CLOEXEC));
100 if (keychord_fd == -1) {
101 ERROR("could not open /dev/keychord: %s\n", strerror(errno));
102 return;
103 }
104
105 int ret = write(keychord_fd, keychords, keychords_length);
106 if (ret != keychords_length) {
107 ERROR("could not configure /dev/keychord %d: %s\n", ret, strerror(errno));
108 close(keychord_fd);
109 }
110
111 free(keychords);
112 keychords = nullptr;
113
114 register_epoll_handler(keychord_fd, handle_keychord);
115 }
116