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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 #include <unistd.h>
     17 #include <errno.h>
     18 #include <sys/types.h>
     19 #include <sys/wait.h>
     20 
     21 #define LOG_TAG "ClatdController"
     22 #include <cutils/log.h>
     23 
     24 #include "ClatdController.h"
     25 
     26 ClatdController::ClatdController() {
     27     mClatdPid = 0;
     28 }
     29 
     30 ClatdController::~ClatdController() {
     31 }
     32 
     33 int ClatdController::startClatd(char *interface) {
     34     pid_t pid;
     35 
     36     if(mClatdPid != 0) {
     37         ALOGE("clatd already running");
     38         errno = EBUSY;
     39         return -1;
     40     }
     41 
     42     ALOGD("starting clatd");
     43 
     44     if ((pid = fork()) < 0) {
     45         ALOGE("fork failed (%s)", strerror(errno));
     46         return -1;
     47     }
     48 
     49     if (!pid) {
     50         char **args = (char **)malloc(sizeof(char *) * 4);
     51         args[0] = (char *)"/system/bin/clatd";
     52         args[1] = (char *)"-i";
     53         args[2] = interface;
     54         args[3] = NULL;
     55 
     56         if (execv(args[0], args)) {
     57             ALOGE("execv failed (%s)", strerror(errno));
     58         }
     59         ALOGE("Should never get here!");
     60         free(args);
     61         _exit(0);
     62     } else {
     63         mClatdPid = pid;
     64         ALOGD("clatd started");
     65     }
     66 
     67     return 0;
     68 }
     69 
     70 int ClatdController::stopClatd() {
     71     if (mClatdPid == 0) {
     72         ALOGE("clatd already stopped");
     73         return -1;
     74     }
     75 
     76     ALOGD("Stopping clatd");
     77 
     78     kill(mClatdPid, SIGTERM);
     79     waitpid(mClatdPid, NULL, 0);
     80     mClatdPid = 0;
     81 
     82     ALOGD("clatd stopped");
     83 
     84     return 0;
     85 }
     86 
     87 bool ClatdController::isClatdStarted() {
     88     pid_t waitpid_status;
     89     if(mClatdPid == 0) {
     90         return false;
     91     }
     92     waitpid_status = waitpid(mClatdPid, NULL, WNOHANG);
     93     if(waitpid_status != 0) {
     94         mClatdPid = 0; // child exited, don't call waitpid on it again
     95     }
     96     return waitpid_status == 0; // 0 while child is running
     97 }
     98