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/*
* Copyright (C) 2009 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.
*/
/* this program is used to read a set of system properties and their values
* from the emulator program and set them in the currently-running emulated
* system. It does so by connecting to the 'boot-properties' qemud service.
*
* This program should be run as root and called from
* /system/etc/init.goldfish.rc exclusively.
*/
#define LOG_TAG "qemu-props"
#define DEBUG 1
#if DEBUG
# include <cutils/log.h>
# define DD(...) ALOGI(__VA_ARGS__)
#else
# define DD(...) ((void)0)
#endif
#include <cutils/properties.h>
#include <unistd.h>
#include <hardware/qemud.h>
/* Name of the qemud service we want to connect to.
*/
#define QEMUD_SERVICE "boot-properties"
#define MAX_TRIES 5
int main(void)
{
int qemud_fd, count = 0;
/* try to connect to the qemud service */
{
int tries = MAX_TRIES;
while (1) {
qemud_fd = qemud_channel_open( "boot-properties" );
if (qemud_fd >= 0)
break;
if (--tries <= 0) {
DD("Could not connect after too many tries. Aborting");
return 1;
}
DD("waiting 1s to wait for qemud.");
sleep(1);
}
}
DD("connected to '%s' qemud service.", QEMUD_SERVICE);
/* send the 'list' command to the service */
if (qemud_channel_send(qemud_fd, "list", -1) < 0) {
DD("could not send command to '%s' service", QEMUD_SERVICE);
return 1;
}
/* read each system property as a single line from the service,
* until exhaustion.
*/
for (;;)
{
#define BUFF_SIZE (PROPERTY_KEY_MAX + PROPERTY_VALUE_MAX + 2)
DD("receiving..");
char* q;
char temp[BUFF_SIZE];
int len = qemud_channel_recv(qemud_fd, temp, sizeof temp - 1);
/* lone NUL-byte signals end of properties */
if (len < 0 || len > BUFF_SIZE-1 || temp[0] == '\0')
break;
temp[len] = '\0'; /* zero-terminate string */
DD("received: %.*s", len, temp);
/* separate propery name from value */
q = strchr(temp, '=');
if (q == NULL) {
DD("invalid format, ignored.");
continue;
}
*q++ = '\0';
if (property_set(temp, q) < 0) {
DD("could not set property '%s' to '%s'", temp, q);
} else {
count += 1;
}
}
/* finally, close the channel and exit */
close(qemud_fd);
DD("exiting (%d properties set).", count);
return 0;
}
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