LogReader.cpp revision 3e76e0a49760c4970b7cda6153e51026af98e4f3 
1/*
2 * Copyright (C) 2012-2013 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 <poll.h>
18#include <sys/socket.h>
19#include <cutils/sockets.h>
20
21#include "LogReader.h"
22#include "FlushCommand.h"
23
24LogReader::LogReader(LogBuffer *logbuf)
25        : SocketListener("logdr", true)
26        , mLogbuf(*logbuf)
27{ }
28
29// When we are notified a new log entry is available, inform
30// all of our listening sockets.
31void LogReader::notifyNewLog() {
32    FlushCommand command(*this);
33    runOnEachSocket(&command);
34}
35
36bool LogReader::onDataAvailable(SocketClient *cli) {
37    char buffer[255];
38
39    int len = read(cli->getSocket(), buffer, sizeof(buffer) - 1);
40    if (len <= 0) {
41        doSocketDelete(cli);
42        return false;
43    }
44    buffer[len] = '\0';
45
46    unsigned long tail = 0;
47    static const char _tail[] = " tail=";
48    char *cp = strstr(buffer, _tail);
49    if (cp) {
50        tail = atol(cp + sizeof(_tail) - 1);
51    }
52
53    unsigned int logMask = -1;
54    static const char _logIds[] = " lids=";
55    cp = strstr(buffer, _logIds);
56    if (cp) {
57        logMask = 0;
58        cp += sizeof(_logIds) - 1;
59        while (*cp && *cp != '\0') {
60            int val = 0;
61            while (('0' <= *cp) && (*cp <= '9')) {
62                val *= 10;
63                val += *cp - '0';
64                ++cp;
65            }
66            logMask |= 1 << val;
67            if (*cp != ',') {
68                break;
69            }
70            ++cp;
71        }
72    }
73
74    pid_t pid = 0;
75    static const char _pid[] = " pid=";
76    cp = strstr(buffer, _pid);
77    if (cp) {
78        pid = atol(cp + sizeof(_pid) - 1);
79    }
80
81    bool nonBlock = false;
82    if (strncmp(buffer, "dumpAndClose", 12) == 0) {
83        nonBlock = true;
84    }
85
86    FlushCommand command(*this, nonBlock, tail, logMask, pid);
87    command.runSocketCommand(cli);
88    return true;
89}
90
91void LogReader::doSocketDelete(SocketClient *cli) {
92    LastLogTimes &times = mLogbuf.mTimes;
93    LogTimeEntry::lock();
94    LastLogTimes::iterator it = times.begin();
95    while(it != times.end()) {
96        LogTimeEntry *entry = (*it);
97        if (entry->mClient == cli) {
98            times.erase(it);
99            entry->release_Locked();
100            break;
101        }
102        it++;
103    }
104    LogTimeEntry::unlock();
105}
106