330 lines
8.3 KiB
C
330 lines
8.3 KiB
C
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "properties"
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <cutils/sockets.h>
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#include <errno.h>
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#include <assert.h>
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#include <cutils/properties.h>
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#include "loghack.h"
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#ifdef HAVE_LIBC_SYSTEM_PROPERTIES
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#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
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#include <sys/_system_properties.h>
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int property_set(const char *key, const char *value)
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{
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return __system_property_set(key, value);
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}
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int property_get(const char *key, char *value, const char *default_value)
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{
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int len;
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len = __system_property_get(key, value);
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if(len > 0) {
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return len;
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}
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if(default_value) {
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len = strlen(default_value);
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memcpy(value, default_value, len + 1);
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}
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return len;
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}
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int property_list(void (*propfn)(const char *key, const char *value, void *cookie),
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void *cookie)
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{
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char name[PROP_NAME_MAX];
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char value[PROP_VALUE_MAX];
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const prop_info *pi;
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unsigned n;
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for(n = 0; (pi = __system_property_find_nth(n)); n++) {
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__system_property_read(pi, name, value);
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propfn(name, value, cookie);
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}
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return 0;
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}
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#elif defined(HAVE_SYSTEM_PROPERTY_SERVER)
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/*
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* The Linux simulator provides a "system property server" that uses IPC
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* to set/get/list properties. The file descriptor is shared by all
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* threads in the process, so we use a mutex to ensure that requests
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* from multiple threads don't get interleaved.
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <pthread.h>
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static pthread_once_t gInitOnce = PTHREAD_ONCE_INIT;
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static pthread_mutex_t gPropertyFdLock = PTHREAD_MUTEX_INITIALIZER;
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static int gPropFd = -1;
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/*
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* Connect to the properties server.
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*
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* Returns the socket descriptor on success.
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*/
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static int connectToServer(const char* fileName)
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{
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int sock = -1;
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int cc;
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struct sockaddr_un addr;
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sock = socket(AF_UNIX, SOCK_STREAM, 0);
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if (sock < 0) {
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ALOGW("UNIX domain socket create failed (errno=%d)\n", errno);
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return -1;
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}
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/* connect to socket; fails if file doesn't exist */
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strcpy(addr.sun_path, fileName); // max 108 bytes
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addr.sun_family = AF_UNIX;
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cc = connect(sock, (struct sockaddr*) &addr, SUN_LEN(&addr));
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if (cc < 0) {
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// ENOENT means socket file doesn't exist
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// ECONNREFUSED means socket exists but nobody is listening
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//ALOGW("AF_UNIX connect failed for '%s': %s\n",
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// fileName, strerror(errno));
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close(sock);
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return -1;
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}
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return sock;
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}
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/*
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* Perform one-time initialization.
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*/
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static void init(void)
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{
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assert(gPropFd == -1);
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gPropFd = connectToServer(SYSTEM_PROPERTY_PIPE_NAME);
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if (gPropFd < 0) {
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//ALOGW("not connected to system property server\n");
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} else {
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//ALOGV("Connected to system property server\n");
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}
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}
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int property_get(const char *key, char *value, const char *default_value)
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{
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char sendBuf[1+PROPERTY_KEY_MAX];
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char recvBuf[1+PROPERTY_VALUE_MAX];
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int len = -1;
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//ALOGV("PROPERTY GET [%s]\n", key);
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pthread_once(&gInitOnce, init);
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if (gPropFd < 0) {
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/* this mimics the behavior of the device implementation */
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if (default_value != NULL) {
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strcpy(value, default_value);
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len = strlen(value);
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}
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return len;
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}
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if (strlen(key) >= PROPERTY_KEY_MAX) return -1;
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memset(sendBuf, 0xdd, sizeof(sendBuf)); // placate valgrind
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sendBuf[0] = (char) kSystemPropertyGet;
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strcpy(sendBuf+1, key);
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pthread_mutex_lock(&gPropertyFdLock);
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if (write(gPropFd, sendBuf, sizeof(sendBuf)) != sizeof(sendBuf)) {
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pthread_mutex_unlock(&gPropertyFdLock);
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return -1;
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}
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if (read(gPropFd, recvBuf, sizeof(recvBuf)) != sizeof(recvBuf)) {
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pthread_mutex_unlock(&gPropertyFdLock);
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return -1;
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}
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pthread_mutex_unlock(&gPropertyFdLock);
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/* first byte is 0 if value not defined, 1 if found */
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if (recvBuf[0] == 0) {
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if (default_value != NULL) {
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strcpy(value, default_value);
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len = strlen(value);
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} else {
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/*
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* If the value isn't defined, hand back an empty string and
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* a zero length, rather than a failure. This seems wrong,
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* since you can't tell the difference between "undefined" and
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* "defined but empty", but it's what the device does.
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*/
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value[0] = '\0';
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len = 0;
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}
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} else if (recvBuf[0] == 1) {
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strcpy(value, recvBuf+1);
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len = strlen(value);
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} else {
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ALOGE("Got strange response to property_get request (%d)\n",
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recvBuf[0]);
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assert(0);
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return -1;
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}
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//ALOGV("PROP [found=%d def='%s'] (%d) [%s]: [%s]\n",
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// recvBuf[0], default_value, len, key, value);
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return len;
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}
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int property_set(const char *key, const char *value)
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{
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char sendBuf[1+PROPERTY_KEY_MAX+PROPERTY_VALUE_MAX];
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char recvBuf[1];
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int result = -1;
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//ALOGV("PROPERTY SET [%s]: [%s]\n", key, value);
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pthread_once(&gInitOnce, init);
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if (gPropFd < 0)
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return -1;
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if (strlen(key) >= PROPERTY_KEY_MAX) return -1;
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if (strlen(value) >= PROPERTY_VALUE_MAX) return -1;
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memset(sendBuf, 0xdd, sizeof(sendBuf)); // placate valgrind
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sendBuf[0] = (char) kSystemPropertySet;
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strcpy(sendBuf+1, key);
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strcpy(sendBuf+1+PROPERTY_KEY_MAX, value);
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pthread_mutex_lock(&gPropertyFdLock);
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if (write(gPropFd, sendBuf, sizeof(sendBuf)) != sizeof(sendBuf)) {
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pthread_mutex_unlock(&gPropertyFdLock);
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return -1;
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}
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if (read(gPropFd, recvBuf, sizeof(recvBuf)) != sizeof(recvBuf)) {
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pthread_mutex_unlock(&gPropertyFdLock);
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return -1;
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}
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pthread_mutex_unlock(&gPropertyFdLock);
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if (recvBuf[0] != 1)
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return -1;
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return 0;
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}
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int property_list(void (*propfn)(const char *key, const char *value, void *cookie),
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void *cookie)
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{
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//ALOGV("PROPERTY LIST\n");
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pthread_once(&gInitOnce, init);
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if (gPropFd < 0)
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return -1;
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return 0;
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}
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#else
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/* SUPER-cheesy place-holder implementation for Win32 */
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#include <cutils/threads.h>
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static mutex_t env_lock = MUTEX_INITIALIZER;
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int property_get(const char *key, char *value, const char *default_value)
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{
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char ename[PROPERTY_KEY_MAX + 6];
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char *p;
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int len;
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len = strlen(key);
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if(len >= PROPERTY_KEY_MAX) return -1;
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memcpy(ename, "PROP_", 5);
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memcpy(ename + 5, key, len + 1);
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mutex_lock(&env_lock);
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p = getenv(ename);
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if(p == 0) p = "";
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len = strlen(p);
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if(len >= PROPERTY_VALUE_MAX) {
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len = PROPERTY_VALUE_MAX - 1;
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}
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if((len == 0) && default_value) {
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len = strlen(default_value);
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memcpy(value, default_value, len + 1);
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} else {
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memcpy(value, p, len);
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value[len] = 0;
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}
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mutex_unlock(&env_lock);
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return len;
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}
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int property_set(const char *key, const char *value)
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{
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char ename[PROPERTY_KEY_MAX + 6];
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char *p;
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int len;
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int r;
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if(strlen(value) >= PROPERTY_VALUE_MAX) return -1;
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len = strlen(key);
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if(len >= PROPERTY_KEY_MAX) return -1;
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memcpy(ename, "PROP_", 5);
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memcpy(ename + 5, key, len + 1);
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mutex_lock(&env_lock);
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#ifdef HAVE_MS_C_RUNTIME
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{
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char temp[256];
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snprintf( temp, sizeof(temp), "%s=%s", ename, value);
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putenv(temp);
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r = 0;
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}
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#else
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r = setenv(ename, value, 1);
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#endif
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mutex_unlock(&env_lock);
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return r;
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}
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int property_list(void (*propfn)(const char *key, const char *value, void *cookie),
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void *cookie)
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{
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return 0;
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}
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#endif
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