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 <android-base/properties.h>
27
28 #include "init.h"
29 #include "log.h"
30 #include "service.h"
31
32 static struct input_keychord *keychords = 0;
33 static int keychords_count = 0;
34 static int keychords_length = 0;
35 static int keychord_fd = -1;
36
add_service_keycodes(Service * svc)37 void add_service_keycodes(Service* svc)
38 {
39 struct input_keychord *keychord;
40 size_t i, size;
41
42 if (!svc->keycodes().empty()) {
43 /* add a new keychord to the list */
44 size = sizeof(*keychord) + svc->keycodes().size() * sizeof(keychord->keycodes[0]);
45 keychords = (input_keychord*) realloc(keychords, keychords_length + size);
46 if (!keychords) {
47 PLOG(ERROR) << "could not allocate keychords";
48 keychords_length = 0;
49 keychords_count = 0;
50 return;
51 }
52
53 keychord = (struct input_keychord *)((char *)keychords + keychords_length);
54 keychord->version = KEYCHORD_VERSION;
55 keychord->id = keychords_count + 1;
56 keychord->count = svc->keycodes().size();
57 svc->set_keychord_id(keychord->id);
58
59 for (i = 0; i < svc->keycodes().size(); i++) {
60 keychord->keycodes[i] = svc->keycodes()[i];
61 }
62 keychords_count++;
63 keychords_length += size;
64 }
65 }
66
handle_keychord()67 static void handle_keychord() {
68 int ret;
69 __u16 id;
70
71 ret = read(keychord_fd, &id, sizeof(id));
72 if (ret != sizeof(id)) {
73 PLOG(ERROR) << "could not read keychord id";
74 return;
75 }
76
77 // Only handle keychords if adb is enabled.
78 std::string adb_enabled = android::base::GetProperty("init.svc.adbd", "");
79 if (adb_enabled == "running") {
80 Service* svc = ServiceManager::GetInstance().FindServiceByKeychord(id);
81 if (svc) {
82 LOG(INFO) << "Starting service " << svc->name() << " from keychord " << id;
83 svc->Start();
84 } else {
85 LOG(ERROR) << "Service for keychord " << id << " not found";
86 }
87 } else {
88 LOG(WARNING) << "Not starting service for keychord " << id << " because ADB is disabled";
89 }
90 }
91
keychord_init()92 void keychord_init() {
93 ServiceManager::GetInstance().ForEachService(add_service_keycodes);
94
95 // Nothing to do if no services require keychords.
96 if (!keychords) {
97 return;
98 }
99
100 keychord_fd = TEMP_FAILURE_RETRY(open("/dev/keychord", O_RDWR | O_CLOEXEC));
101 if (keychord_fd == -1) {
102 PLOG(ERROR) << "could not open /dev/keychord";
103 return;
104 }
105
106 int ret = write(keychord_fd, keychords, keychords_length);
107 if (ret != keychords_length) {
108 PLOG(ERROR) << "could not configure /dev/keychord " << ret;
109 close(keychord_fd);
110 }
111
112 free(keychords);
113 keychords = nullptr;
114
115 register_epoll_handler(keychord_fd, handle_keychord);
116 }
117