1/* 2 * Copyright (C) 2009 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/* this program is used to read a set of system properties and their values 18 * from the emulator program and set them in the currently-running emulated 19 * system. It does so by connecting to the 'boot-properties' qemud service. 20 * 21 * This program should be run as root and called from 22 * /system/etc/init.goldfish.rc exclusively. 23 */ 24 25#define LOG_TAG "qemu-props" 26 27#define DEBUG 1 28 29#if DEBUG 30# include <cutils/log.h> 31# define DD(...) ALOGI(__VA_ARGS__) 32#else 33# define DD(...) ((void)0) 34#endif 35 36#include <cutils/properties.h> 37#include <unistd.h> 38#include "qemud.h" 39 40/* Name of the qemud service we want to connect to. 41 */ 42#define QEMUD_SERVICE "boot-properties" 43 44#define MAX_TRIES 5 45 46int main(void) 47{ 48 int qemud_fd, count = 0; 49 50 /* try to connect to the qemud service */ 51 { 52 int tries = MAX_TRIES; 53 54 while (1) { 55 qemud_fd = qemud_channel_open( "boot-properties" ); 56 if (qemud_fd >= 0) 57 break; 58 59 if (--tries <= 0) { 60 DD("Could not connect after too many tries. Aborting"); 61 return 1; 62 } 63 64 DD("waiting 1s to wait for qemud."); 65 sleep(1); 66 } 67 } 68 69 DD("connected to '%s' qemud service.", QEMUD_SERVICE); 70 71 /* send the 'list' command to the service */ 72 if (qemud_channel_send(qemud_fd, "list", -1) < 0) { 73 DD("could not send command to '%s' service", QEMUD_SERVICE); 74 return 1; 75 } 76 77 /* read each system property as a single line from the service, 78 * until exhaustion. 79 */ 80 for (;;) 81 { 82#define BUFF_SIZE (PROPERTY_KEY_MAX + PROPERTY_VALUE_MAX + 2) 83 DD("receiving.."); 84 char* q; 85 char temp[BUFF_SIZE]; 86 int len = qemud_channel_recv(qemud_fd, temp, sizeof temp - 1); 87 88 /* lone NUL-byte signals end of properties */ 89 if (len < 0 || len > BUFF_SIZE-1 || temp[0] == '\0') 90 break; 91 92 temp[len] = '\0'; /* zero-terminate string */ 93 94 DD("received: %.*s", len, temp); 95 96 /* separate propery name from value */ 97 q = strchr(temp, '='); 98 if (q == NULL) { 99 DD("invalid format, ignored."); 100 continue; 101 } 102 *q++ = '\0'; 103 104 if (property_set(temp, q) < 0) { 105 DD("could not set property '%s' to '%s'", temp, q); 106 } else { 107 count += 1; 108 } 109 } 110 111 112 /* HACK start adbd periodically every minute, if adbd is already running, this is a no-op */ 113 for(;;) { 114 usleep(60000000); 115 char temp[BUFF_SIZE]; 116 property_get("sys.boot_completed", temp, ""); 117 int is_boot_completed = (strncmp(temp, "1", 1) == 0) ? 1 : 0; 118 if (is_boot_completed) { 119 DD("start adbd ..."); 120 property_set("qemu.adbd", "start"); 121 } else { 122 DD("skip starting adbd ..."); 123 } 124 } 125 126 /* finally, close the channel and exit */ 127 close(qemud_fd); 128 DD("exiting (%d properties set).", count); 129 return 0; 130} 131