diff --git a/src/devtools/adb_tcp/logd_write.c b/src/devtools/adb_tcp/logd_write.c
new file mode 100644
index 0000000..b2668ce
--- /dev/null
+++ b/src/devtools/adb_tcp/logd_write.c
@@ -0,0 +1,499 @@
+/*
+ * Copyright (C) 2007-2014 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 <errno.h>
+#include <fcntl.h>
+#ifdef HAVE_PTHREADS
+#include <pthread.h>
+#endif
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#if (FAKE_LOG_DEVICE == 0)
+#include <sys/socket.h>
+#include <sys/un.h>
+#endif
+#include <time.h>
+#include <unistd.h>
+
+#ifdef __BIONIC__
+#include <android/set_abort_message.h>
+#endif
+
+#include <log/logd.h>
+#include <log/logger.h>
+#include <log/log_read.h>
+#include <private/android_filesystem_config.h>
+
+#define LOG_BUF_SIZE 1024
+
+#if FAKE_LOG_DEVICE
+/* This will be defined when building for the host. */
+#include "fake_log_device.h"
+#endif
+
+static int __write_to_log_init(log_id_t, struct iovec *vec, size_t nr);
+static int (*write_to_log)(log_id_t, struct iovec *vec, size_t nr) = __write_to_log_init;
+#ifdef HAVE_PTHREADS
+static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
+#endif
+
+#ifndef __unused
+#define __unused  __attribute__((__unused__))
+#endif
+
+#if FAKE_LOG_DEVICE
+static int log_fds[(int)LOG_ID_MAX] = { -1, -1, -1, -1, -1 };
+#else
+static int logd_fd = -1;
+#endif
+
+/*
+ * This is used by the C++ code to decide if it should write logs through
+ * the C code.  Basically, if /dev/socket/logd is available, we're running in
+ * the simulator rather than a desktop tool and want to use the device.
+ */
+static enum {
+    kLogUninitialized, kLogNotAvailable, kLogAvailable
+} g_log_status = kLogUninitialized;
+int __android_log_dev_available(void)
+{
+    if (g_log_status == kLogUninitialized) {
+        if (access("/dev/socket/logdw", W_OK) == 0)
+            g_log_status = kLogAvailable;
+        else
+            g_log_status = kLogNotAvailable;
+    }
+
+    return (g_log_status == kLogAvailable);
+}
+
+#if !FAKE_LOG_DEVICE
+/* give up, resources too limited */
+static int __write_to_log_null(log_id_t log_fd __unused, struct iovec *vec __unused,
+                               size_t nr __unused)
+{
+    return -1;
+}
+#endif
+
+/* log_init_lock assumed */
+static int __write_to_log_initialize()
+{
+    int i, ret = 0;
+
+#if FAKE_LOG_DEVICE
+    for (i = 0; i < LOG_ID_MAX; i++) {
+        char buf[sizeof("/dev/log_system")];
+        snprintf(buf, sizeof(buf), "/dev/log_%s", android_log_id_to_name(i));
+        log_fds[i] = fakeLogOpen(buf, O_WRONLY);
+    }
+#else
+    if (logd_fd >= 0) {
+        i = logd_fd;
+        logd_fd = -1;
+        close(i);
+    }
+
+    i = socket(PF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
+    if (i < 0) {
+        ret = -errno;
+        write_to_log = __write_to_log_null;
+    } else if (fcntl(i, F_SETFL, O_NONBLOCK) < 0) {
+        ret = -errno;
+        close(i);
+        i = -1;
+        write_to_log = __write_to_log_null;
+    } else {
+        struct sockaddr_un un;
+        memset(&un, 0, sizeof(struct sockaddr_un));
+        un.sun_family = AF_UNIX;
+        strcpy(un.sun_path, "/dev/socket/logdw");
+
+        if (connect(i, (struct sockaddr *)&un, sizeof(struct sockaddr_un)) < 0) {
+            ret = -errno;
+            close(i);
+            i = -1;
+        }
+    }
+    logd_fd = i;
+#endif
+
+    return ret;
+}
+
+static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec, size_t nr)
+{
+    ssize_t ret;
+#if FAKE_LOG_DEVICE
+    int log_fd;
+
+    if (/*(int)log_id >= 0 &&*/ (int)log_id < (int)LOG_ID_MAX) {
+        log_fd = log_fds[(int)log_id];
+    } else {
+        return -EBADF;
+    }
+    do {
+        ret = fakeLogWritev(log_fd, vec, nr);
+        if (ret < 0) {
+            ret = -errno;
+        }
+    } while (ret == -EINTR);
+#else
+    static const unsigned header_length = 3;
+    struct iovec newVec[nr + header_length];
+    typeof_log_id_t log_id_buf;
+    uint16_t tid;
+    struct timespec ts;
+    log_time realtime_ts;
+    size_t i, payload_size;
+    static uid_t last_uid = AID_ROOT; /* logd *always* starts up as AID_ROOT */
+
+    if (last_uid == AID_ROOT) { /* have we called to get the UID yet? */
+        last_uid = getuid();
+    }
+    if (last_uid == AID_LOGD) { /* logd, after initialization and priv drop */
+        /*
+         * ignore log messages we send to ourself (logd).
+         * Such log messages are often generated by libraries we depend on
+         * which use standard Android logging.
+         */
+        return 0;
+    }
+
+    if (logd_fd < 0) {
+        return -EBADF;
+    }
+
+    /*
+     *  struct {
+     *      // what we provide
+     *      typeof_log_id_t  log_id;
+     *      u16              tid;
+     *      log_time         realtime;
+     *      // caller provides
+     *      union {
+     *          struct {
+     *              char     prio;
+     *              char     payload[];
+     *          } string;
+     *          struct {
+     *              uint32_t tag
+     *              char     payload[];
+     *          } binary;
+     *      };
+     *  };
+     */
+
+    clock_gettime(CLOCK_REALTIME, &ts);
+    realtime_ts.tv_sec = ts.tv_sec;
+    realtime_ts.tv_nsec = ts.tv_nsec;
+
+    log_id_buf = log_id;
+    tid = gettid();
+
+    newVec[0].iov_base   = (unsigned char *) &log_id_buf;
+    newVec[0].iov_len    = sizeof_log_id_t;
+    newVec[1].iov_base   = (unsigned char *) &tid;
+    newVec[1].iov_len    = sizeof(tid);
+    newVec[2].iov_base   = (unsigned char *) &realtime_ts;
+    newVec[2].iov_len    = sizeof(log_time);
+
+    for (payload_size = 0, i = header_length; i < nr + header_length; i++) {
+        newVec[i].iov_base = vec[i - header_length].iov_base;
+        payload_size += newVec[i].iov_len = vec[i - header_length].iov_len;
+
+        if (payload_size > LOGGER_ENTRY_MAX_PAYLOAD) {
+            newVec[i].iov_len -= payload_size - LOGGER_ENTRY_MAX_PAYLOAD;
+            if (newVec[i].iov_len) {
+                ++i;
+            }
+            break;
+        }
+    }
+
+    /*
+     * The write below could be lost, but will never block.
+     *
+     * ENOTCONN occurs if logd dies.
+     * EAGAIN occurs if logd is overloaded.
+     */
+    ret = writev(logd_fd, newVec, i);
+    if (ret < 0) {
+        ret = -errno;
+        if (ret == -ENOTCONN) {
+#ifdef HAVE_PTHREADS
+            pthread_mutex_lock(&log_init_lock);
+#endif
+            ret = __write_to_log_initialize();
+#ifdef HAVE_PTHREADS
+            pthread_mutex_unlock(&log_init_lock);
+#endif
+
+            if (ret < 0) {
+                return ret;
+            }
+
+            ret = writev(logd_fd, newVec, nr + header_length);
+            if (ret < 0) {
+                ret = -errno;
+            }
+        }
+    }
+
+    if (ret > (ssize_t)(sizeof_log_id_t + sizeof(tid) + sizeof(log_time))) {
+        ret -= sizeof_log_id_t + sizeof(tid) + sizeof(log_time);
+    }
+#endif
+
+    return ret;
+}
+
+#if FAKE_LOG_DEVICE
+static const char *LOG_NAME[LOG_ID_MAX] = {
+    [LOG_ID_MAIN] = "main",
+    [LOG_ID_RADIO] = "radio",
+    [LOG_ID_EVENTS] = "events",
+    [LOG_ID_SYSTEM] = "system",
+    [LOG_ID_CRASH] = "crash"
+};
+
+const char *android_log_id_to_name(log_id_t log_id)
+{
+    if (log_id >= LOG_ID_MAX) {
+        log_id = LOG_ID_MAIN;
+    }
+    return LOG_NAME[log_id];
+}
+#endif
+
+static int __write_to_log_init(log_id_t log_id, struct iovec *vec, size_t nr)
+{
+#ifdef HAVE_PTHREADS
+    pthread_mutex_lock(&log_init_lock);
+#endif
+
+    if (write_to_log == __write_to_log_init) {
+        int ret;
+
+        ret = __write_to_log_initialize();
+        if (ret < 0) {
+#ifdef HAVE_PTHREADS
+            pthread_mutex_unlock(&log_init_lock);
+#endif
+            return ret;
+        }
+
+        write_to_log = __write_to_log_kernel;
+    }
+
+#ifdef HAVE_PTHREADS
+    pthread_mutex_unlock(&log_init_lock);
+#endif
+
+    return write_to_log(log_id, vec, nr);
+}
+
+int __android_log_write(int prio, const char *tag, const char *msg)
+{
+    struct iovec vec[3];
+    log_id_t log_id = LOG_ID_MAIN;
+    char tmp_tag[32];
+
+    if (!tag)
+        tag = "";
+
+    /* XXX: This needs to go! */
+    if (!strcmp(tag, "HTC_RIL") ||
+        !strncmp(tag, "RIL", 3) || /* Any log tag with "RIL" as the prefix */
+        !strncmp(tag, "IMS", 3) || /* Any log tag with "IMS" as the prefix */
+        !strcmp(tag, "AT") ||
+        !strcmp(tag, "GSM") ||
+        !strcmp(tag, "STK") ||
+        !strcmp(tag, "CDMA") ||
+        !strcmp(tag, "PHONE") ||
+        !strcmp(tag, "SMS")) {
+            log_id = LOG_ID_RADIO;
+            /* Inform third party apps/ril/radio.. to use Rlog or RLOG */
+            snprintf(tmp_tag, sizeof(tmp_tag), "use-Rlog/RLOG-%s", tag);
+            tag = tmp_tag;
+    }
+
+#if __BIONIC__
+    if (prio == ANDROID_LOG_FATAL) {
+        android_set_abort_message(msg);
+    }
+#endif
+
+    vec[0].iov_base   = (unsigned char *) &prio;
+    vec[0].iov_len    = 1;
+    vec[1].iov_base   = (void *) tag;
+    vec[1].iov_len    = strlen(tag) + 1;
+    vec[2].iov_base   = (void *) msg;
+    vec[2].iov_len    = strlen(msg) + 1;
+
+    return write_to_log(log_id, vec, 3);
+}
+
+int __android_log_buf_write(int bufID, int prio, const char *tag, const char *msg)
+{
+    struct iovec vec[3];
+    char tmp_tag[32];
+
+    if (!tag)
+        tag = "";
+
+    /* XXX: This needs to go! */
+    if ((bufID != LOG_ID_RADIO) &&
+         (!strcmp(tag, "HTC_RIL") ||
+        !strncmp(tag, "RIL", 3) || /* Any log tag with "RIL" as the prefix */
+        !strncmp(tag, "IMS", 3) || /* Any log tag with "IMS" as the prefix */
+        !strcmp(tag, "AT") ||
+        !strcmp(tag, "GSM") ||
+        !strcmp(tag, "STK") ||
+        !strcmp(tag, "CDMA") ||
+        !strcmp(tag, "PHONE") ||
+        !strcmp(tag, "SMS"))) {
+            bufID = LOG_ID_RADIO;
+            /* Inform third party apps/ril/radio.. to use Rlog or RLOG */
+            snprintf(tmp_tag, sizeof(tmp_tag), "use-Rlog/RLOG-%s", tag);
+            tag = tmp_tag;
+    }
+
+    vec[0].iov_base   = (unsigned char *) &prio;
+    vec[0].iov_len    = 1;
+    vec[1].iov_base   = (void *) tag;
+    vec[1].iov_len    = strlen(tag) + 1;
+    vec[2].iov_base   = (void *) msg;
+    vec[2].iov_len    = strlen(msg) + 1;
+
+    return write_to_log(bufID, vec, 3);
+}
+
+int __android_log_vprint(int prio, const char *tag, const char *fmt, va_list ap)
+{
+    char buf[LOG_BUF_SIZE];
+
+    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
+
+    return __android_log_write(prio, tag, buf);
+}
+
+int __android_log_print(int prio, const char *tag, const char *fmt, ...)
+{
+    va_list ap;
+    char buf[LOG_BUF_SIZE];
+
+    va_start(ap, fmt);
+    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
+    va_end(ap);
+
+    return __android_log_write(prio, tag, buf);
+}
+
+int __android_log_buf_print(int bufID, int prio, const char *tag, const char *fmt, ...)
+{
+    va_list ap;
+    char buf[LOG_BUF_SIZE];
+
+    va_start(ap, fmt);
+    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
+    va_end(ap);
+
+    return __android_log_buf_write(bufID, prio, tag, buf);
+}
+
+void __android_log_assert(const char *cond, const char *tag,
+                          const char *fmt, ...)
+{
+    char buf[LOG_BUF_SIZE];
+
+    if (fmt) {
+        va_list ap;
+        va_start(ap, fmt);
+        vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
+        va_end(ap);
+    } else {
+        /* Msg not provided, log condition.  N.B. Do not use cond directly as
+         * format string as it could contain spurious '%' syntax (e.g.
+         * "%d" in "blocks%devs == 0").
+         */
+        if (cond)
+            snprintf(buf, LOG_BUF_SIZE, "Assertion failed: %s", cond);
+        else
+            strcpy(buf, "Unspecified assertion failed");
+    }
+
+    __android_log_write(ANDROID_LOG_FATAL, tag, buf);
+    __builtin_trap(); /* trap so we have a chance to debug the situation */
+    /* NOTREACHED */
+}
+
+int __android_log_bwrite(int32_t tag, const void *payload, size_t len)
+{
+    struct iovec vec[2];
+
+    vec[0].iov_base = &tag;
+    vec[0].iov_len = sizeof(tag);
+    vec[1].iov_base = (void*)payload;
+    vec[1].iov_len = len;
+
+    return write_to_log(LOG_ID_EVENTS, vec, 2);
+}
+
+/*
+ * Like __android_log_bwrite, but takes the type as well.  Doesn't work
+ * for the general case where we're generating lists of stuff, but very
+ * handy if we just want to dump an integer into the log.
+ */
+int __android_log_btwrite(int32_t tag, char type, const void *payload,
+                          size_t len)
+{
+    struct iovec vec[3];
+
+    vec[0].iov_base = &tag;
+    vec[0].iov_len = sizeof(tag);
+    vec[1].iov_base = &type;
+    vec[1].iov_len = sizeof(type);
+    vec[2].iov_base = (void*)payload;
+    vec[2].iov_len = len;
+
+    return write_to_log(LOG_ID_EVENTS, vec, 3);
+}
+
+/*
+ * Like __android_log_bwrite, but used for writing strings to the
+ * event log.
+ */
+int __android_log_bswrite(int32_t tag, const char *payload)
+{
+    struct iovec vec[4];
+    char type = EVENT_TYPE_STRING;
+    uint32_t len = strlen(payload);
+
+    vec[0].iov_base = &tag;
+    vec[0].iov_len = sizeof(tag);
+    vec[1].iov_base = &type;
+    vec[1].iov_len = sizeof(type);
+    vec[2].iov_base = &len;
+    vec[2].iov_len = sizeof(len);
+    vec[3].iov_base = (void*)payload;
+    vec[3].iov_len = len;
+
+    return write_to_log(LOG_ID_EVENTS, vec, 4);
+}