logd: add thread setname

- permits easier determination of logd thread at
  fault in a stack trace from debuggerd.

Bug: 14275676
Change-Id: Iac2c523147e2bcce34ab7ddcecd02582c5fa7cc0

logd/CommandListener.cpp

@@ -21,6 +21,7 @@
 #include <netinet/in.h>
 #include <string.h>
 #include <stdlib.h>
+#include <sys/prctl.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 
@@ -66,8 +67,13 @@ CommandListener::ClearCmd::ClearCmd(LogBuffer *buf)
         , mBuf(*buf)
 { }
 
+static void setname() {
+    prctl(PR_SET_NAME, "logd.control");
+}
+
 int CommandListener::ClearCmd::runCommand(SocketClient *cli,
                                          int argc, char **argv) {
+    setname();
     if (!clientHasLogCredentials(cli)) {
         cli->sendMsg("Permission Denied");
         return 0;
@@ -96,6 +102,7 @@ CommandListener::GetBufSizeCmd::GetBufSizeCmd(LogBuffer *buf)
 
 int CommandListener::GetBufSizeCmd::runCommand(SocketClient *cli,
                                          int argc, char **argv) {
+    setname();
     if (argc < 2) {
         cli->sendMsg("Missing Argument");
         return 0;
@@ -121,6 +128,7 @@ CommandListener::SetBufSizeCmd::SetBufSizeCmd(LogBuffer *buf)
 
 int CommandListener::SetBufSizeCmd::runCommand(SocketClient *cli,
                                          int argc, char **argv) {
+    setname();
     if (!clientHasLogCredentials(cli)) {
         cli->sendMsg("Permission Denied");
         return 0;
@@ -154,6 +162,7 @@ CommandListener::GetBufSizeUsedCmd::GetBufSizeUsedCmd(LogBuffer *buf)
 
 int CommandListener::GetBufSizeUsedCmd::runCommand(SocketClient *cli,
                                          int argc, char **argv) {
+    setname();
     if (argc < 2) {
         cli->sendMsg("Missing Argument");
         return 0;
@@ -197,6 +206,7 @@ static void package_string(char **strp) {
 
 int CommandListener::GetStatisticsCmd::runCommand(SocketClient *cli,
                                          int argc, char **argv) {
+    setname();
     uid_t uid = cli->getUid();
     gid_t gid = cli->getGid();
     if (clientHasLogCredentials(cli)) {
@@ -236,6 +246,7 @@ CommandListener::GetPruneListCmd::GetPruneListCmd(LogBuffer *buf)
 
 int CommandListener::GetPruneListCmd::runCommand(SocketClient *cli,
                                          int /*argc*/, char ** /*argv*/) {
+    setname();
     char *buf = NULL;
     mBuf.formatPrune(&buf);
     if (!buf) {
@@ -255,6 +266,7 @@ CommandListener::SetPruneListCmd::SetPruneListCmd(LogBuffer *buf)
 
 int CommandListener::SetPruneListCmd::runCommand(SocketClient *cli,
                                          int argc, char **argv) {
+    setname();
     if (!clientHasLogCredentials(cli)) {
         cli->sendMsg("Permission Denied");
         return 0;

logd/LogAudit.cpp

@@ -19,6 +19,7 @@
 #include <stdarg.h>
 #include <stdlib.h>
 #include <sys/klog.h>
+#include <sys/prctl.h>
 #include <sys/uio.h>
 
 #include "libaudit.h"
@@ -34,6 +35,8 @@ LogAudit::LogAudit(LogBuffer *buf, LogReader *reader, int fdDmsg)
 }
 
 bool LogAudit::onDataAvailable(SocketClient *cli) {
+    prctl(PR_SET_NAME, "logd.auditd");
+
     struct audit_message rep;
 
     if (audit_get_reply(cli->getSocket(), &rep, GET_REPLY_BLOCKING, 0) < 0) {

logd/LogListener.cpp

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <sys/prctl.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 #include <sys/un.h>
@@ -31,6 +32,8 @@ LogListener::LogListener(LogBuffer *buf, LogReader *reader)
 {  }
 
 bool LogListener::onDataAvailable(SocketClient *cli) {
+    prctl(PR_SET_NAME, "logd.writer");
+
     char buffer[sizeof_log_id_t + sizeof(uint16_t) + sizeof(log_time)
         + LOGGER_ENTRY_MAX_PAYLOAD];
     struct iovec iov = { buffer, sizeof(buffer) };

logd/LogReader.cpp

@@ -16,6 +16,7 @@
 
 #include <ctype.h>
 #include <poll.h>
+#include <sys/prctl.h>
 #include <sys/socket.h>
 
 #include <cutils/sockets.h>
@@ -36,6 +37,8 @@ void LogReader::notifyNewLog() {
 }
 
 bool LogReader::onDataAvailable(SocketClient *cli) {
+    prctl(PR_SET_NAME, "logd.reader");
+
     char buffer[255];
 
     int len = read(cli->getSocket(), buffer, sizeof(buffer) - 1);

logd/LogTimes.cpp

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#include <sys/prctl.h>
+
 #include "FlushCommand.h"
 #include "LogBuffer.h"
 #include "LogTimes.h"
@@ -107,6 +109,8 @@ void LogTimeEntry::threadStop(void *obj) {
 }
 
 void *LogTimeEntry::threadStart(void *obj) {
+    prctl(PR_SET_NAME, "logd.reader.per");
+
     LogTimeEntry *me = reinterpret_cast<LogTimeEntry *>(obj);
 
     pthread_cleanup_push(threadStop, obj);