1 files changed, 186 insertions, 0 deletions
diff --git a/logd/LogReader.cpp b/logd/LogReader.cpp
new file mode 100644
index 0000000..8458c19
--- /dev/null
+++ b/logd/LogReader.cpp
@@ -0,0 +1,186 @@
+/*
+ * Copyright (C) 2012-2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <ctype.h>
+#include <poll.h>
+#include <sys/prctl.h>
+#include <sys/socket.h>
+
+#include <cutils/sockets.h>
+
+#include "LogReader.h"
+#include "FlushCommand.h"
+
+LogReader::LogReader(LogBuffer *logbuf)
+        : SocketListener(getLogSocket(), true)
+        , mLogbuf(*logbuf)
+{ }
+
+// When we are notified a new log entry is available, inform
+// all of our listening sockets.
+void LogReader::notifyNewLog() {
+    FlushCommand command(*this);
+    runOnEachSocket(&command);
+}
+
+bool LogReader::onDataAvailable(SocketClient *cli) {
+    prctl(PR_SET_NAME, "logd.reader");
+
+    char buffer[255];
+
+    int len = read(cli->getSocket(), buffer, sizeof(buffer) - 1);
+    if (len <= 0) {
+        doSocketDelete(cli);
+        return false;
+    }
+    buffer[len] = '\0';
+
+    unsigned long tail = 0;
+    static const char _tail[] = " tail=";
+    char *cp = strstr(buffer, _tail);
+    if (cp) {
+        tail = atol(cp + sizeof(_tail) - 1);
+    }
+
+    log_time start(log_time::EPOCH);
+    static const char _start[] = " start=";
+    cp = strstr(buffer, _start);
+    if (cp) {
+        // Parse errors will result in current time
+        start.strptime(cp + sizeof(_start) - 1, "%s.%q");
+    }
+
+    unsigned int logMask = -1;
+    static const char _logIds[] = " lids=";
+    cp = strstr(buffer, _logIds);
+    if (cp) {
+        logMask = 0;
+        cp += sizeof(_logIds) - 1;
+        while (*cp && *cp != '\0') {
+            int val = 0;
+            while (isdigit(*cp)) {
+                val = val * 10 + *cp - '0';
+                ++cp;
+            }
+            logMask |= 1 << val;
+            if (*cp != ',') {
+                break;
+            }
+            ++cp;
+        }
+    }
+
+    pid_t pid = 0;
+    static const char _pid[] = " pid=";
+    cp = strstr(buffer, _pid);
+    if (cp) {
+        pid = atol(cp + sizeof(_pid) - 1);
+    }
+
+    bool nonBlock = false;
+    if (strncmp(buffer, "dumpAndClose", 12) == 0) {
+        nonBlock = true;
+    }
+
+    // Convert realtime to monotonic time
+    if (start == log_time::EPOCH) {
+        start = LogTimeEntry::EPOCH;
+    } else {
+        class LogFindStart {
+            const pid_t mPid;
+            const unsigned mLogMask;
+            bool startTimeSet;
+            log_time &start;
+            log_time last;
+
+        public:
+            LogFindStart(unsigned logMask, pid_t pid, log_time &start)
+                    : mPid(pid)
+                    , mLogMask(logMask)
+                    , startTimeSet(false)
+                    , start(start)
+                    , last(LogTimeEntry::EPOCH)
+            { }
+
+            static bool callback(const LogBufferElement *element, void *obj) {
+                LogFindStart *me = reinterpret_cast<LogFindStart *>(obj);
+                if (!me->startTimeSet
+                        && (!me->mPid || (me->mPid == element->getPid()))
+                        && (me->mLogMask & (1 << element->getLogId()))) {
+                    if (me->start == element->getRealTime()) {
+                        me->start = element->getMonotonicTime();
+                        me->startTimeSet = true;
+                    } else {
+                        if (me->start < element->getRealTime()) {
+                            me->start = me->last;
+                            me->startTimeSet = true;
+                        }
+                        me->last = element->getMonotonicTime();
+                    }
+                }
+                return false;
+            }
+
+            bool found() { return startTimeSet; }
+        } logFindStart(logMask, pid, start);
+
+        logbuf().flushTo(cli, LogTimeEntry::EPOCH,
+                         FlushCommand::hasReadLogs(cli),
+                         logFindStart.callback, &logFindStart);
+
+        if (!logFindStart.found()) {
+            if (nonBlock) {
+                doSocketDelete(cli);
+                return false;
+            }
+            log_time now(CLOCK_MONOTONIC);
+            start = now;
+        }
+    }
+
+    FlushCommand command(*this, nonBlock, tail, logMask, pid, start);
+    command.runSocketCommand(cli);
+    return true;
+}
+
+void LogReader::doSocketDelete(SocketClient *cli) {
+    LastLogTimes &times = mLogbuf.mTimes;
+    LogTimeEntry::lock();
+    LastLogTimes::iterator it = times.begin();
+    while(it != times.end()) {
+        LogTimeEntry *entry = (*it);
+        if (entry->mClient == cli) {
+            times.erase(it);
+            entry->release_Locked();
+            break;
+        }
+        it++;
+    }
+    LogTimeEntry::unlock();
+}
+
+int LogReader::getLogSocket() {
+    static const char socketName[] = "logdr";
+    int sock = android_get_control_socket(socketName);
+
+    if (sock < 0) {
+        sock = socket_local_server(socketName,
+                                   ANDROID_SOCKET_NAMESPACE_RESERVED,
+                                   SOCK_SEQPACKET);
+    }
+
+    return sock;
+}