main_mediaserver.cpp revision 6f1c1918d0dfece10f728711b055441e4d135c73 
1/*
2**
3** Copyright 2008, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18#define LOG_TAG "mediaserver"
19//#define LOG_NDEBUG 0
20
21#include <fcntl.h>
22#include <sys/prctl.h>
23#include <sys/wait.h>
24#include <binder/IPCThreadState.h>
25#include <binder/ProcessState.h>
26#include <binder/IServiceManager.h>
27#include <cutils/properties.h>
28#include <utils/Log.h>
29
30// from LOCAL_C_INCLUDES
31#include "AudioFlinger.h"
32#include "CameraService.h"
33#include "MediaLogService.h"
34#include "MediaPlayerService.h"
35#include "AudioPolicyService.h"
36
37using namespace android;
38
39int main(int argc, char** argv)
40{
41    signal(SIGPIPE, SIG_IGN);
42    char value[PROPERTY_VALUE_MAX];
43    bool doLog = (property_get("ro.test_harness", value, "0") > 0) && (atoi(value) == 1);
44    pid_t childPid;
45    // FIXME The advantage of making the process containing media.log service the parent process of
46    // the process that contains all the other real services, is that it allows us to collect more
47    // detailed information such as signal numbers, stop and continue, resource usage, etc.
48    // But it is also more complex.  Consider replacing this by independent processes, and using
49    // binder on death notification instead.
50    if (doLog && (childPid = fork()) != 0) {
51        // media.log service
52        //prctl(PR_SET_NAME, (unsigned long) "media.log", 0, 0, 0);
53        // unfortunately ps ignores PR_SET_NAME for the main thread, so use this ugly hack
54        strcpy(argv[0], "media.log");
55        sp<ProcessState> proc(ProcessState::self());
56        MediaLogService::instantiate();
57        ProcessState::self()->startThreadPool();
58        for (;;) {
59            siginfo_t info;
60            int ret = waitid(P_PID, childPid, &info, WEXITED | WSTOPPED | WCONTINUED);
61            if (ret == EINTR) {
62                continue;
63            }
64            if (ret < 0) {
65                break;
66            }
67            char buffer[32];
68            const char *code;
69            switch (info.si_code) {
70            case CLD_EXITED:
71                code = "CLD_EXITED";
72                break;
73            case CLD_KILLED:
74                code = "CLD_KILLED";
75                break;
76            case CLD_DUMPED:
77                code = "CLD_DUMPED";
78                break;
79            case CLD_STOPPED:
80                code = "CLD_STOPPED";
81                break;
82            case CLD_TRAPPED:
83                code = "CLD_TRAPPED";
84                break;
85            case CLD_CONTINUED:
86                code = "CLD_CONTINUED";
87                break;
88            default:
89                snprintf(buffer, sizeof(buffer), "unknown (%d)", info.si_code);
90                code = buffer;
91                break;
92            }
93            struct rusage usage;
94            getrusage(RUSAGE_CHILDREN, &usage);
95            ALOG(LOG_ERROR, "media.log", "pid %d status %d code %s user %ld.%03lds sys %ld.%03lds",
96                    info.si_pid, info.si_status, code,
97                    usage.ru_utime.tv_sec, usage.ru_utime.tv_usec / 1000,
98                    usage.ru_stime.tv_sec, usage.ru_stime.tv_usec / 1000);
99            sp<IServiceManager> sm = defaultServiceManager();
100            sp<IBinder> binder = sm->getService(String16("media.log"));
101            if (binder != 0) {
102                Vector<String16> args;
103                binder->dump(-1, args);
104            }
105            switch (info.si_code) {
106            case CLD_EXITED:
107            case CLD_KILLED:
108            case CLD_DUMPED: {
109                ALOG(LOG_INFO, "media.log", "exiting");
110                _exit(0);
111                // not reached
112                }
113            default:
114                break;
115            }
116        }
117    } else {
118        // all other services
119        if (doLog) {
120            prctl(PR_SET_PDEATHSIG, SIGKILL);   // if parent media.log dies before me, kill me also
121            setpgid(0, 0);                      // but if I die first, don't kill my parent
122        }
123        sp<ProcessState> proc(ProcessState::self());
124        sp<IServiceManager> sm = defaultServiceManager();
125        ALOGI("ServiceManager: %p", sm.get());
126        AudioFlinger::instantiate();
127        MediaPlayerService::instantiate();
128        CameraService::instantiate();
129        AudioPolicyService::instantiate();
130        ProcessState::self()->startThreadPool();
131        IPCThreadState::self()->joinThreadPool();
132    }
133}
134