auto import from //depot/cupcake/@135843
diff --git a/libcutils/ashmem-host.c b/libcutils/ashmem-host.c
new file mode 100644
index 0000000..dbb52bc
--- /dev/null
+++ b/libcutils/ashmem-host.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2008 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.
+ */
+
+/*
+ * Implementation of the user-space ashmem API for the simulator, which lacks
+ * an ashmem-enabled kernel. See ashmem-dev.c for the real ashmem-based version.
+ */
+
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <time.h>
+#include <limits.h>
+
+#include <cutils/ashmem.h>
+
+int ashmem_create_region(const char *ignored, size_t size)
+{
+ static const char txt[] = "abcdefghijklmnopqrstuvwxyz"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+ char name[64];
+ unsigned int retries = 0;
+ pid_t pid = getpid();
+ int fd;
+
+ srand(time(NULL) + pid);
+
+retry:
+ /* not beautiful, its just wolf-like loop unrolling */
+ snprintf(name, sizeof(name), "/tmp/android-ashmem-%d-%c%c%c%c%c%c%c%c",
+ pid,
+ txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))],
+ txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))],
+ txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))],
+ txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))],
+ txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))],
+ txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))],
+ txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))],
+ txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))]);
+
+ /* open O_EXCL & O_CREAT: we are either the sole owner or we fail */
+ fd = open(name, O_RDWR | O_CREAT | O_EXCL, 0600);
+ if (fd == -1) {
+ /* unlikely, but if we failed because `name' exists, retry */
+ if (errno == EEXIST && ++retries < 6)
+ goto retry;
+ return -1;
+ }
+
+ /* truncate the file to `len' bytes */
+ if (ftruncate(fd, size) == -1)
+ goto error;
+
+ if (unlink(name) == -1)
+ goto error;
+
+ return fd;
+error:
+ close(fd);
+ return -1;
+}
+
+int ashmem_set_prot_region(int fd, int prot)
+{
+ return 0;
+}
+
+int ashmem_pin_region(int fd, size_t offset, size_t len)
+{
+ return ASHMEM_NOT_PURGED;
+}
+
+int ashmem_unpin_region(int fd, size_t offset, size_t len)
+{
+ return ASHMEM_IS_UNPINNED;
+}