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Commit cfe90f29 authored by Tom Cherry's avatar Tom Cherry Committed by Automerger Merge Worker
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Merge "Revert "liblog: use a blocking socket for sending messages to logd"" am: cadeec10 

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1397308

Change-Id: Ibb9b17338b6a00967b7981ea365a34939e3a40e7
parents f614dd95 cadeec10

liblog/logd_writer.cpp

+55 −3
Original line number Diff line number Diff line
@@ -59,7 +59,8 @@ static void GetSocket() { 
    return;

  }



  int new_socket = TEMP_FAILURE_RETRY(socket(PF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0));

  int new_socket =

      TEMP_FAILURE_RETRY(socket(PF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0));

  if (new_socket <= 0) {

    return;

  }
@@ -90,6 +91,8 @@ int LogdWrite(log_id_t logId, struct timespec* ts, struct iovec* vec, size_t nr) 
  struct iovec newVec[nr + headerLength];

  android_log_header_t header;

  size_t i, payloadSize;

  static atomic_int dropped;

  static atomic_int droppedSecurity;



  GetSocket();
@@ -107,7 +110,6 @@ int LogdWrite(log_id_t logId, struct timespec* ts, struct iovec* vec, size_t nr) 
    return 0;

  }



  header.id = logId;

  header.tid = gettid();

  header.realtime.tv_sec = ts->tv_sec;

  header.realtime.tv_nsec = ts->tv_nsec;
@@ -115,6 +117,44 @@ int LogdWrite(log_id_t logId, struct timespec* ts, struct iovec* vec, size_t nr) 
  newVec[0].iov_base = (unsigned char*)&header;

  newVec[0].iov_len = sizeof(header);



  int32_t snapshot = atomic_exchange_explicit(&droppedSecurity, 0, memory_order_relaxed);

  if (snapshot) {

    android_log_event_int_t buffer;



    header.id = LOG_ID_SECURITY;

    buffer.header.tag = LIBLOG_LOG_TAG;

    buffer.payload.type = EVENT_TYPE_INT;

    buffer.payload.data = snapshot;



    newVec[headerLength].iov_base = &buffer;

    newVec[headerLength].iov_len = sizeof(buffer);



    ret = TEMP_FAILURE_RETRY(writev(logd_socket, newVec, 2));

    if (ret != (ssize_t)(sizeof(header) + sizeof(buffer))) {

      atomic_fetch_add_explicit(&droppedSecurity, snapshot, memory_order_relaxed);

    }

  }

  snapshot = atomic_exchange_explicit(&dropped, 0, memory_order_relaxed);

  if (snapshot && __android_log_is_loggable_len(ANDROID_LOG_INFO, "liblog", strlen("liblog"),

                                                ANDROID_LOG_VERBOSE)) {

    android_log_event_int_t buffer;



    header.id = LOG_ID_EVENTS;

    buffer.header.tag = LIBLOG_LOG_TAG;

    buffer.payload.type = EVENT_TYPE_INT;

    buffer.payload.data = snapshot;



    newVec[headerLength].iov_base = &buffer;

    newVec[headerLength].iov_len = sizeof(buffer);



    ret = TEMP_FAILURE_RETRY(writev(logd_socket, newVec, 2));

    if (ret != (ssize_t)(sizeof(header) + sizeof(buffer))) {

      atomic_fetch_add_explicit(&dropped, snapshot, memory_order_relaxed);

    }

  }



  header.id = logId;



  for (payloadSize = 0, i = headerLength; i < nr + headerLength; i++) {

    newVec[i].iov_base = vec[i - headerLength].iov_base;

    payloadSize += newVec[i].iov_len = vec[i - headerLength].iov_len;
@@ -128,8 +168,11 @@ int LogdWrite(log_id_t logId, struct timespec* ts, struct iovec* vec, size_t nr) 
    }

  }



  // The write below could be lost, but will never block.

  // EAGAIN occurs if logd is overloaded, other errors indicate that something went wrong with

  // the connection, so we reset it and try again.

  ret = TEMP_FAILURE_RETRY(writev(logd_socket, newVec, i));

  if (ret < 0) {

  if (ret < 0 && errno != EAGAIN) {

    LogdConnect();



    ret = TEMP_FAILURE_RETRY(writev(logd_socket, newVec, i));
@@ -139,5 +182,14 @@ int LogdWrite(log_id_t logId, struct timespec* ts, struct iovec* vec, size_t nr) 
    ret = -errno;

  }



  if (ret > (ssize_t)sizeof(header)) {

    ret -= sizeof(header);

  } else if (ret < 0) {

    atomic_fetch_add_explicit(&dropped, 1, memory_order_relaxed);

    if (logId == LOG_ID_SECURITY) {

      atomic_fetch_add_explicit(&droppedSecurity, 1, memory_order_relaxed);

    }

  }



  return ret;

}