1 files changed, 114 insertions, 0 deletions
diff --git a/init/keychords.cpp b/init/keychords.cpp
new file mode 100644
index 0000000..10d9573
--- /dev/null
+++ b/init/keychords.cpp
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <linux/keychord.h>
+#include <unistd.h>
+
+#include "init.h"
+#include "log.h"
+#include "property_service.h"
+
+static struct input_keychord *keychords = 0;
+static int keychords_count = 0;
+static int keychords_length = 0;
+static int keychord_fd = -1;
+
+void add_service_keycodes(struct service *svc)
+{
+    struct input_keychord *keychord;
+    int i, size;
+
+    if (svc->keycodes) {
+        /* add a new keychord to the list */
+        size = sizeof(*keychord) + svc->nkeycodes * sizeof(keychord->keycodes[0]);
+        keychords = (input_keychord*) realloc(keychords, keychords_length + size);
+        if (!keychords) {
+            ERROR("could not allocate keychords\n");
+            keychords_length = 0;
+            keychords_count = 0;
+            return;
+        }
+
+        keychord = (struct input_keychord *)((char *)keychords + keychords_length);
+        keychord->version = KEYCHORD_VERSION;
+        keychord->id = keychords_count + 1;
+        keychord->count = svc->nkeycodes;
+        svc->keychord_id = keychord->id;
+
+        for (i = 0; i < svc->nkeycodes; i++) {
+            keychord->keycodes[i] = svc->keycodes[i];
+        }
+        keychords_count++;
+        keychords_length += size;
+    }
+}
+
+static void handle_keychord() {
+    struct service *svc;
+    char adb_enabled[PROP_VALUE_MAX];
+    int ret;
+    __u16 id;
+
+    // Only handle keychords if adb is enabled.
+    property_get("init.svc.adbd", adb_enabled);
+    ret = read(keychord_fd, &id, sizeof(id));
+    if (ret != sizeof(id)) {
+        ERROR("could not read keychord id\n");
+        return;
+    }
+
+    if (!strcmp(adb_enabled, "running")) {
+        svc = service_find_by_keychord(id);
+        if (svc) {
+            INFO("Starting service %s from keychord\n", svc->name);
+            service_start(svc, NULL);
+        } else {
+            ERROR("service for keychord %d not found\n", id);
+        }
+    }
+}
+
+void keychord_init() {
+    service_for_each(add_service_keycodes);
+
+    // Nothing to do if no services require keychords.
+    if (!keychords) {
+        return;
+    }
+
+    keychord_fd = TEMP_FAILURE_RETRY(open("/dev/keychord", O_RDWR | O_CLOEXEC));
+    if (keychord_fd == -1) {
+        ERROR("could not open /dev/keychord: %s\n", strerror(errno));
+        return;
+    }
+
+    int ret = write(keychord_fd, keychords, keychords_length);
+    if (ret != keychords_length) {
+        ERROR("could not configure /dev/keychord %d: %s\n", ret, strerror(errno));
+        close(keychord_fd);
+    }
+
+    free(keychords);
+    keychords = nullptr;
+
+    register_epoll_handler(keychord_fd, handle_keychord);
+}