Merge "logd: syscall optimization"

logd/CommandListener.cpp

@@ -69,7 +69,11 @@ CommandListener::ClearCmd::ClearCmd(LogBuffer *buf)
 { }
 
 static void setname() {
-    prctl(PR_SET_NAME, "logd.control");
+    static bool name_set;
+    if (!name_set) {
+        prctl(PR_SET_NAME, "logd.control");
+        name_set = true;
+    }
 }
 
 int CommandListener::ClearCmd::runCommand(SocketClient *cli,

logd/LogAudit.cpp

@@ -24,6 +24,7 @@
 #include <sys/uio.h>
 #include <syslog.h>
 
+#include <private/android_filesystem_config.h>
 #include <private/android_logger.h>
 
 #include "libaudit.h"
@@ -110,7 +111,7 @@ int LogAudit::logPrint(const char *fmt, ...) {
 
     pid_t pid = getpid();
     pid_t tid = gettid();
-    uid_t uid = getuid();
+    uid_t uid = AID_LOGD;
     log_time now;
 
     static const char audit_str[] = " audit(";

logd/LogListener.cpp

@@ -23,6 +23,7 @@
 
 #include <cutils/sockets.h>
 #include <log/logger.h>
+#include <private/android_filesystem_config.h>
 #include <private/android_logger.h>
 
 #include "LogListener.h"
@@ -34,7 +35,11 @@ LogListener::LogListener(LogBuffer *buf, LogReader *reader)
 {  }
 
 bool LogListener::onDataAvailable(SocketClient *cli) {
-    prctl(PR_SET_NAME, "logd.writer");
+    static bool name_set;
+    if (!name_set) {
+        prctl(PR_SET_NAME, "logd.writer");
+        name_set = true;
+    }
 
     char buffer[sizeof_log_id_t + sizeof(uint16_t) + sizeof(log_time)
         + LOGGER_ENTRY_MAX_PAYLOAD];
@@ -75,7 +80,7 @@ bool LogListener::onDataAvailable(SocketClient *cli) {
         return false;
     }
 
-    if (cred->uid == getuid()) {
+    if (cred->uid == AID_LOGD) {
         // ignore log messages we send to ourself.
         // Such log messages are often generated by libraries we depend on
         // which use standard Android logging.

logd/LogReader.cpp

@@ -37,7 +37,11 @@ void LogReader::notifyNewLog() {
 }
 
 bool LogReader::onDataAvailable(SocketClient *cli) {
-    prctl(PR_SET_NAME, "logd.reader");
+    static bool name_set;
+    if (!name_set) {
+        prctl(PR_SET_NAME, "logd.reader");
+        name_set = true;
+    }
 
     char buffer[255];
 

logd/LogStatistics.cpp

@@ -437,7 +437,7 @@ uid_t pidToUid(pid_t pid) {
         }
         fclose(fp);
     }
-    return getuid(); // associate this with the logger
+    return AID_LOGD; // associate this with the logger
 }
 
 }

logd/main.cpp

@@ -35,8 +35,8 @@
 #include <cutils/properties.h>
 #include <cutils/sched_policy.h>
 #include <cutils/sockets.h>
+#include <private/android_filesystem_config.h>
 
-#include "private/android_filesystem_config.h"
 #include "CommandListener.h"
 #include "LogBuffer.h"
 #include "LogListener.h"