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
26ClatdController::ClatdController() {
27    mClatdPid = 0;
28}
29
30ClatdController::~ClatdController() {
31}
32
33int 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
70int 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
87bool 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