auto import from //depot/cupcake/@135843
diff --git a/liblog/logd_write.c b/liblog/logd_write.c
new file mode 100644
index 0000000..80867d1
--- /dev/null
+++ b/liblog/logd_write.c
@@ -0,0 +1,230 @@
+/*
+ * Copyright (C) 2007 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 <time.h>
+#include <stdio.h>
+#ifdef HAVE_PTHREADS
+#include <pthread.h>
+#endif
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+#include <cutils/logger.h>
+#include <cutils/logd.h>
+
+#define LOG_BUF_SIZE 1024
+
+#if FAKE_LOG_DEVICE
+// This will be defined when building for the host.
+#define log_open(pathname, flags) fakeLogOpen(pathname, flags)
+#define log_writev(filedes, vector, count) fakeLogWritev(filedes, vector, count)
+#define log_close(filedes) fakeLogClose(filedes)
+#else
+#define log_open(pathname, flags) open(pathname, flags)
+#define log_writev(filedes, vector, count) writev(filedes, vector, count)
+#define log_close(filedes) close(filedes)
+#endif
+
+typedef enum {
+ LOG_ID_MAIN = 0,
+ LOG_ID_RADIO,
+ LOG_ID_EVENTS,
+ LOG_ID_MAX
+} log_id_t;
+
+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
+
+static int log_fds[(int)LOG_ID_MAX] = { -1, -1, -1 };
+
+/*
+ * This is used by the C++ code to decide if it should write logs through
+ * the C code. Basically, if /dev/log/... 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/"LOGGER_LOG_MAIN, W_OK) == 0)
+ g_log_status = kLogAvailable;
+ else
+ g_log_status = kLogNotAvailable;
+ }
+
+ return (g_log_status == kLogAvailable);
+}
+
+static int __write_to_log_null(log_id_t log_fd, struct iovec *vec, size_t nr)
+{
+ return -1;
+}
+
+static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec, size_t nr)
+{
+ ssize_t ret;
+ 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 = log_writev(log_fd, vec, nr);
+ } while (ret < 0 && errno == EINTR);
+
+ return ret;
+}
+
+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) {
+ log_fds[LOG_ID_MAIN] = log_open("/dev/"LOGGER_LOG_MAIN, O_WRONLY);
+ log_fds[LOG_ID_RADIO] = log_open("/dev/"LOGGER_LOG_RADIO, O_WRONLY);
+ log_fds[LOG_ID_EVENTS] = log_open("/dev/"LOGGER_LOG_EVENTS, O_WRONLY);
+
+ write_to_log = __write_to_log_kernel;
+
+ if (log_fds[LOG_ID_MAIN] < 0 || log_fds[LOG_ID_RADIO] < 0 ||
+ log_fds[LOG_ID_EVENTS] < 0) {
+ log_close(log_fds[LOG_ID_MAIN]);
+ log_close(log_fds[LOG_ID_RADIO]);
+ log_close(log_fds[LOG_ID_EVENTS]);
+ log_fds[LOG_ID_MAIN] = -1;
+ log_fds[LOG_ID_RADIO] = -1;
+ log_fds[LOG_ID_EVENTS] = -1;
+ write_to_log = __write_to_log_null;
+ }
+ }
+
+#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;
+
+ if (!tag)
+ tag = "";
+
+ /* XXX: This needs to go! */
+ if (!strcmp(tag, "HTC_RIL") ||
+ !strcmp(tag, "RILJ") ||
+ !strcmp(tag, "RILC") ||
+ !strcmp(tag, "RILD") ||
+ !strcmp(tag, "RIL") ||
+ !strcmp(tag, "AT") ||
+ !strcmp(tag, "GSM") ||
+ !strcmp(tag, "STK"))
+ log_id = LOG_ID_RADIO;
+
+ 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_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);
+}
+
+void __android_log_assert(const char *cond, 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);
+
+ __android_log_write(ANDROID_LOG_FATAL, tag, buf);
+
+ __builtin_trap(); /* trap so we have a chance to debug the situation */
+}
+
+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);
+}