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      1 /*
      2  * Copyright (C) 2008 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 #include <stdio.h>
     18 #include <stdlib.h>
     19 #include <signal.h>
     20 #include <errno.h>
     21 #include <string.h>
     22 #include <sys/stat.h>
     23 #include <sys/types.h>
     24 #include <sys/wait.h>
     25 
     26 #include <fcntl.h>
     27 #include <dirent.h>
     28 
     29 #define LOG_TAG "Netd"
     30 
     31 #include "cutils/log.h"
     32 
     33 #include "CommandListener.h"
     34 #include "NetlinkManager.h"
     35 
     36 static void coldboot(const char *path);
     37 static void sigchld_handler(int sig);
     38 
     39 int main() {
     40 
     41     CommandListener *cl;
     42     NetlinkManager *nm;
     43 
     44     LOGI("Netd 1.0 starting");
     45 
     46 //    signal(SIGCHLD, sigchld_handler);
     47 
     48     if (!(nm = NetlinkManager::Instance())) {
     49         LOGE("Unable to create NetlinkManager");
     50         exit(1);
     51     };
     52 
     53 
     54     cl = new CommandListener();
     55     nm->setBroadcaster((SocketListener *) cl);
     56 
     57     if (nm->start()) {
     58         LOGE("Unable to start NetlinkManager (%s)", strerror(errno));
     59         exit(1);
     60     }
     61 
     62     /*
     63      * Now that we're up, we can respond to commands
     64      */
     65     if (cl->startListener()) {
     66         LOGE("Unable to start CommandListener (%s)", strerror(errno));
     67         exit(1);
     68     }
     69 
     70     // Eventually we'll become the monitoring thread
     71     while(1) {
     72         sleep(1000);
     73     }
     74 
     75     LOGI("Netd exiting");
     76     exit(0);
     77 }
     78 
     79 static void do_coldboot(DIR *d, int lvl)
     80 {
     81     struct dirent *de;
     82     int dfd, fd;
     83 
     84     dfd = dirfd(d);
     85 
     86     fd = openat(dfd, "uevent", O_WRONLY);
     87     if(fd >= 0) {
     88         write(fd, "add\n", 4);
     89         close(fd);
     90     }
     91 
     92     while((de = readdir(d))) {
     93         DIR *d2;
     94 
     95         if (de->d_name[0] == '.')
     96             continue;
     97 
     98         if (de->d_type != DT_DIR && lvl > 0)
     99             continue;
    100 
    101         fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY);
    102         if(fd < 0)
    103             continue;
    104 
    105         d2 = fdopendir(fd);
    106         if(d2 == 0)
    107             close(fd);
    108         else {
    109             do_coldboot(d2, lvl + 1);
    110             closedir(d2);
    111         }
    112     }
    113 }
    114 
    115 static void coldboot(const char *path)
    116 {
    117     DIR *d = opendir(path);
    118     if(d) {
    119         do_coldboot(d, 0);
    120         closedir(d);
    121     }
    122 }
    123 
    124 static void sigchld_handler(int sig) {
    125     pid_t pid = wait(NULL);
    126     LOGD("Child process %d exited", pid);
    127 }
    128