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- /*
- * Copyright (C) 2006 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.
- */
- #define LOG_TAG "properties"
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <cutils/sockets.h>
- #include <errno.h>
- #include <assert.h>
- #include <cutils/properties.h>
- #include "loghack.h"
- #ifdef HAVE_LIBC_SYSTEM_PROPERTIES
- #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
- //#include <sys/_system_properties.h>
- int property_set(const char *key, const char *value)
- {
- /*
- return __system_property_set(key, value);
- */
- return 0;
- }
- int property_get(const char *key, char *value, const char *default_value)
- {
- return 0;
- /*
- int len;
- len = __system_property_get(key, value);
- if(len > 0) {
- return len;
- }
- if(default_value) {
- len = strlen(default_value);
- memcpy(value, default_value, len + 1);
- }
- return len;
- */
- }
- int property_list(void (*propfn)(const char *key, const char *value, void *cookie),
- void *cookie)
- {
- return 0;
- /*
- char name[PROP_NAME_MAX];
- char value[PROP_VALUE_MAX];
- const prop_info *pi;
- unsigned n;
- for(n = 0; (pi = __system_property_find_nth(n)); n++) {
- __system_property_read(pi, name, value);
- propfn(name, value, cookie);
- }
- return 0;
- */
- }
- #elif defined(HAVE_SYSTEM_PROPERTY_SERVER)
- /*
- * The Linux simulator provides a "system property server" that uses IPC
- * to set/get/list properties. The file descriptor is shared by all
- * threads in the process, so we use a mutex to ensure that requests
- * from multiple threads don't get interleaved.
- */
- #include <stdio.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <sys/un.h>
- #include <pthread.h>
- static pthread_once_t gInitOnce = PTHREAD_ONCE_INIT;
- static pthread_mutex_t gPropertyFdLock = PTHREAD_MUTEX_INITIALIZER;
- static int gPropFd = -1;
- /*
- * Connect to the properties server.
- *
- * Returns the socket descriptor on success.
- */
- static int connectToServer(const char* fileName)
- {
- int sock = -1;
- int cc;
- struct sockaddr_un addr;
- sock = socket(AF_UNIX, SOCK_STREAM, 0);
- if (sock < 0) {
- ALOGW("UNIX domain socket create failed (errno=%d)\n", errno);
- return -1;
- }
- /* connect to socket; fails if file doesn't exist */
- strcpy(addr.sun_path, fileName); // max 108 bytes
- addr.sun_family = AF_UNIX;
- cc = connect(sock, (struct sockaddr*) &addr, SUN_LEN(&addr));
- if (cc < 0) {
- // ENOENT means socket file doesn't exist
- // ECONNREFUSED means socket exists but nobody is listening
- //ALOGW("AF_UNIX connect failed for '%s': %s\n",
- // fileName, strerror(errno));
- close(sock);
- return -1;
- }
- return sock;
- }
- /*
- * Perform one-time initialization.
- */
- static void init(void)
- {
- assert(gPropFd == -1);
- gPropFd = connectToServer(SYSTEM_PROPERTY_PIPE_NAME);
- if (gPropFd < 0) {
- //ALOGW("not connected to system property server\n");
- } else {
- //ALOGV("Connected to system property server\n");
- }
- }
- int property_get(const char *key, char *value, const char *default_value)
- {
- char sendBuf[1+PROPERTY_KEY_MAX];
- char recvBuf[1+PROPERTY_VALUE_MAX];
- int len = -1;
- //ALOGV("PROPERTY GET [%s]\n", key);
- pthread_once(&gInitOnce, init);
- if (gPropFd < 0) {
- /* this mimics the behavior of the device implementation */
- if (default_value != NULL) {
- strcpy(value, default_value);
- len = strlen(value);
- }
- return len;
- }
- if (strlen(key) >= PROPERTY_KEY_MAX) return -1;
- memset(sendBuf, 0xdd, sizeof(sendBuf)); // placate valgrind
- sendBuf[0] = (char) kSystemPropertyGet;
- strcpy(sendBuf+1, key);
- pthread_mutex_lock(&gPropertyFdLock);
- if (write(gPropFd, sendBuf, sizeof(sendBuf)) != sizeof(sendBuf)) {
- pthread_mutex_unlock(&gPropertyFdLock);
- return -1;
- }
- if (read(gPropFd, recvBuf, sizeof(recvBuf)) != sizeof(recvBuf)) {
- pthread_mutex_unlock(&gPropertyFdLock);
- return -1;
- }
- pthread_mutex_unlock(&gPropertyFdLock);
- /* first byte is 0 if value not defined, 1 if found */
- if (recvBuf[0] == 0) {
- if (default_value != NULL) {
- strcpy(value, default_value);
- len = strlen(value);
- } else {
- /*
- * If the value isn't defined, hand back an empty string and
- * a zero length, rather than a failure. This seems wrong,
- * since you can't tell the difference between "undefined" and
- * "defined but empty", but it's what the device does.
- */
- value[0] = '\0';
- len = 0;
- }
- } else if (recvBuf[0] == 1) {
- strcpy(value, recvBuf+1);
- len = strlen(value);
- } else {
- ALOGE("Got strange response to property_get request (%d)\n",
- recvBuf[0]);
- assert(0);
- return -1;
- }
- //ALOGV("PROP [found=%d def='%s'] (%d) [%s]: [%s]\n",
- // recvBuf[0], default_value, len, key, value);
- return len;
- }
- int property_set(const char *key, const char *value)
- {
- char sendBuf[1+PROPERTY_KEY_MAX+PROPERTY_VALUE_MAX];
- char recvBuf[1];
- int result = -1;
- //ALOGV("PROPERTY SET [%s]: [%s]\n", key, value);
- pthread_once(&gInitOnce, init);
- if (gPropFd < 0)
- return -1;
- if (strlen(key) >= PROPERTY_KEY_MAX) return -1;
- if (strlen(value) >= PROPERTY_VALUE_MAX) return -1;
- memset(sendBuf, 0xdd, sizeof(sendBuf)); // placate valgrind
- sendBuf[0] = (char) kSystemPropertySet;
- strcpy(sendBuf+1, key);
- strcpy(sendBuf+1+PROPERTY_KEY_MAX, value);
- pthread_mutex_lock(&gPropertyFdLock);
- if (write(gPropFd, sendBuf, sizeof(sendBuf)) != sizeof(sendBuf)) {
- pthread_mutex_unlock(&gPropertyFdLock);
- return -1;
- }
- if (read(gPropFd, recvBuf, sizeof(recvBuf)) != sizeof(recvBuf)) {
- pthread_mutex_unlock(&gPropertyFdLock);
- return -1;
- }
- pthread_mutex_unlock(&gPropertyFdLock);
- if (recvBuf[0] != 1)
- return -1;
- return 0;
- }
- int property_list(void (*propfn)(const char *key, const char *value, void *cookie),
- void *cookie)
- {
- //ALOGV("PROPERTY LIST\n");
- pthread_once(&gInitOnce, init);
- if (gPropFd < 0)
- return -1;
- return 0;
- }
- #else
- /* SUPER-cheesy place-holder implementation for Win32 */
- #include <cutils/threads.h>
- static mutex_t env_lock = MUTEX_INITIALIZER;
- int property_get(const char *key, char *value, const char *default_value)
- {
- char ename[PROPERTY_KEY_MAX + 6];
- char *p;
- int len;
- len = strlen(key);
- if(len >= PROPERTY_KEY_MAX) return -1;
- memcpy(ename, "PROP_", 5);
- memcpy(ename + 5, key, len + 1);
- mutex_lock(&env_lock);
- p = getenv(ename);
- if(p == 0) p = "";
- len = strlen(p);
- if(len >= PROPERTY_VALUE_MAX) {
- len = PROPERTY_VALUE_MAX - 1;
- }
- if((len == 0) && default_value) {
- len = strlen(default_value);
- memcpy(value, default_value, len + 1);
- } else {
- memcpy(value, p, len);
- value[len] = 0;
- }
- mutex_unlock(&env_lock);
- return len;
- }
- int property_set(const char *key, const char *value)
- {
- char ename[PROPERTY_KEY_MAX + 6];
- char *p;
- int len;
- int r;
- if(strlen(value) >= PROPERTY_VALUE_MAX) return -1;
- len = strlen(key);
- if(len >= PROPERTY_KEY_MAX) return -1;
- memcpy(ename, "PROP_", 5);
- memcpy(ename + 5, key, len + 1);
- mutex_lock(&env_lock);
- #ifdef HAVE_MS_C_RUNTIME
- {
- char temp[256];
- snprintf( temp, sizeof(temp), "%s=%s", ename, value);
- putenv(temp);
- r = 0;
- }
- #else
- r = setenv(ename, value, 1);
- #endif
- mutex_unlock(&env_lock);
- return r;
- }
- int property_list(void (*propfn)(const char *key, const char *value, void *cookie),
- void *cookie)
- {
- return 0;
- }
- #endif
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