Use WriteFully in debuggerd to talk to ActivityManager.

#include <sys/wait.h>

#include <backtrace/Backtrace.h>

#include <base/file.h>

#include <log/log.h>

const int SLEEP_TIME_USEC = 50000;         // 0.05 seconds

const int MAX_TOTAL_SLEEP_USEC = 10000000; // 10 seconds

static int write_to_am(int fd, const char* buf, int len) {

  int to_write = len;

  while (to_write > 0) {

    int written = TEMP_FAILURE_RETRY(write(fd, buf + len - to_write, to_write));

    if (written < 0) {

      // hard failure

      ALOGE("AM write failure (%d / %s)\n", errno, strerror(errno));

      return -1;

    }

    to_write -= written;

  }

  return len;

}

// Whitelist output desired in the logcat output.

bool is_allowed_in_logcat(enum logtype ltype) {

  if ((ltype == ERROR)

  if (write_to_logcat) {

    __android_log_buf_write(LOG_ID_CRASH, ANDROID_LOG_INFO, LOG_TAG, buf);

    if (write_to_activitymanager) {

      int written = write_to_am(log->amfd, buf, len);

      if (written <= 0) {

      if (!android::base::WriteFully(log->amfd, buf, len)) {

        // timeout or other failure on write; stop informing the activity manager

        ALOGE("AM write failed: %s", strerror(errno));

        log->amfd = -1;

      }

    }