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      1 /*
      2  * Copyright (C) 2005 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 #define LOG_TAG "misc"
     18 
     19 //
     20 // Miscellaneous utility functions.
     21 //
     22 #include <utils/misc.h>
     23 #include <utils/Log.h>
     24 
     25 #include <sys/stat.h>
     26 #include <string.h>
     27 #include <errno.h>
     28 #include <assert.h>
     29 #include <stdio.h>
     30 
     31 #if defined(HAVE_PTHREADS)
     32 # include <pthread.h>
     33 #endif
     34 
     35 #include <utils/Vector.h>
     36 
     37 using namespace android;
     38 
     39 namespace android {
     40 
     41 /*
     42  * Get a file's type.
     43  */
     44 FileType getFileType(const char* fileName)
     45 {
     46     struct stat sb;
     47 
     48     if (stat(fileName, &sb) < 0) {
     49         if (errno == ENOENT || errno == ENOTDIR)
     50             return kFileTypeNonexistent;
     51         else {
     52             fprintf(stderr, "getFileType got errno=%d on '%s'\n",
     53                 errno, fileName);
     54             return kFileTypeUnknown;
     55         }
     56     } else {
     57         if (S_ISREG(sb.st_mode))
     58             return kFileTypeRegular;
     59         else if (S_ISDIR(sb.st_mode))
     60             return kFileTypeDirectory;
     61         else if (S_ISCHR(sb.st_mode))
     62             return kFileTypeCharDev;
     63         else if (S_ISBLK(sb.st_mode))
     64             return kFileTypeBlockDev;
     65         else if (S_ISFIFO(sb.st_mode))
     66             return kFileTypeFifo;
     67 #ifdef HAVE_SYMLINKS
     68         else if (S_ISLNK(sb.st_mode))
     69             return kFileTypeSymlink;
     70         else if (S_ISSOCK(sb.st_mode))
     71             return kFileTypeSocket;
     72 #endif
     73         else
     74             return kFileTypeUnknown;
     75     }
     76 }
     77 
     78 /*
     79  * Get a file's modification date.
     80  */
     81 time_t getFileModDate(const char* fileName)
     82 {
     83     struct stat sb;
     84 
     85     if (stat(fileName, &sb) < 0)
     86         return (time_t) -1;
     87 
     88     return sb.st_mtime;
     89 }
     90 
     91 struct sysprop_change_callback_info {
     92     sysprop_change_callback callback;
     93     int priority;
     94 };
     95 
     96 #if defined(HAVE_PTHREADS)
     97 static pthread_mutex_t gSyspropMutex = PTHREAD_MUTEX_INITIALIZER;
     98 static Vector<sysprop_change_callback_info>* gSyspropList = NULL;
     99 #endif
    100 
    101 void add_sysprop_change_callback(sysprop_change_callback cb, int priority) {
    102 #if defined(HAVE_PTHREADS)
    103     pthread_mutex_lock(&gSyspropMutex);
    104     if (gSyspropList == NULL) {
    105         gSyspropList = new Vector<sysprop_change_callback_info>();
    106     }
    107     sysprop_change_callback_info info;
    108     info.callback = cb;
    109     info.priority = priority;
    110     bool added = false;
    111     for (size_t i=0; i<gSyspropList->size(); i++) {
    112         if (priority >= gSyspropList->itemAt(i).priority) {
    113             gSyspropList->insertAt(info, i);
    114             added = true;
    115             break;
    116         }
    117     }
    118     if (!added) {
    119         gSyspropList->add(info);
    120     }
    121     pthread_mutex_unlock(&gSyspropMutex);
    122 #endif
    123 }
    124 
    125 void report_sysprop_change() {
    126 #if defined(HAVE_PTHREADS)
    127     pthread_mutex_lock(&gSyspropMutex);
    128     Vector<sysprop_change_callback_info> listeners;
    129     if (gSyspropList != NULL) {
    130         listeners = *gSyspropList;
    131     }
    132     pthread_mutex_unlock(&gSyspropMutex);
    133 
    134     //ALOGI("Reporting sysprop change to %d listeners", listeners.size());
    135     for (size_t i=0; i<listeners.size(); i++) {
    136         listeners[i].callback();
    137     }
    138 #endif
    139 }
    140 
    141 }; // namespace android
    142