1 files changed, 73 insertions, 0 deletions
diff --git a/mozglue/android/Ashmem.cpp b/mozglue/android/Ashmem.cpp
new file mode 100644
index 0000000000..9c93fe2b10
--- /dev/null
+++ b/mozglue/android/Ashmem.cpp
@@ -0,0 +1,73 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <cstring>
+#include <dlfcn.h>
+#include <fcntl.h>
+#include <linux/ashmem.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include "Ashmem.h"
+
+namespace mozilla {
+namespace android {
+
+static void* libhandle() {
+  static void* handle = dlopen("libandroid.so", RTLD_LAZY | RTLD_LOCAL);
+  return handle;
+}
+
+int ashmem_create(const char* name, size_t size) {
+  static auto fCreate =
+      (int (*)(const char*, size_t))dlsym(libhandle(), "ASharedMemory_create");
+
+  if (fCreate) {
+    return fCreate(name, size);
+  }
+
+  int fd = open("/" ASHMEM_NAME_DEF, O_RDWR, 0600);
+  if (fd < 0) {
+    return fd;
+  }
+
+  if (name) {
+    char str[ASHMEM_NAME_LEN];
+    strlcpy(str, name, sizeof(str));
+    ioctl(fd, ASHMEM_SET_NAME, str);
+  }
+
+  if (ioctl(fd, ASHMEM_SET_SIZE, size) != 0) {
+    close(fd);
+    return -1;
+  }
+
+  return fd;
+}
+
+size_t ashmem_getSize(int fd) {
+  static auto fGetSize =
+      (size_t(*)(int))dlsym(libhandle(), "ASharedMemory_getSize");
+  if (fGetSize) {
+    return fGetSize(fd);
+  }
+
+  return (size_t)ioctl(fd, ASHMEM_GET_SIZE, nullptr);
+}
+
+int ashmem_setProt(int fd, int prot) {
+  static auto fSetProt =
+      (int (*)(int, int))dlsym(libhandle(), "ASharedMemory_setProt");
+  if (fSetProt) {
+    return fSetProt(fd, prot);
+  }
+
+  return ioctl(fd, ASHMEM_SET_PROT_MASK, prot);
+}
+
+}  // namespace android
+}  // namespace mozilla