checkpoint: split libutils into libutils + libbinder

1 files changed, 183 insertions, 0 deletions

diff --git a/libs/binder/MemoryHeapBase.cpp b/libs/binder/MemoryHeapBase.cpp
new file mode 100644
index 0000000..8251728
--- /dev/null
+++ b/libs/binder/MemoryHeapBase.cpp
@@ -0,0 +1,183 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "MemoryHeapBase"
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+
+#include <cutils/log.h>
+#include <cutils/ashmem.h>
+#include <cutils/atomic.h>
+
+#include <utils/MemoryHeapBase.h>
+
+#if HAVE_ANDROID_OS
+#include <linux/android_pmem.h>
+#endif
+
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+MemoryHeapBase::MemoryHeapBase() 
+    : mFD(-1), mSize(0), mBase(MAP_FAILED),
+      mDevice(NULL), mNeedUnmap(false) 
+{
+}
+
+MemoryHeapBase::MemoryHeapBase(size_t size, uint32_t flags, char const * name)
+    : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
+      mDevice(0), mNeedUnmap(false)
+{
+    const size_t pagesize = getpagesize();
+    size = ((size + pagesize-1) & ~(pagesize-1));
+    int fd = ashmem_create_region(name == NULL ? "MemoryHeapBase" : name, size);
+    LOGE_IF(fd<0, "error creating ashmem region: %s", strerror(errno));
+    if (fd >= 0) {
+        if (mapfd(fd, size) == NO_ERROR) {
+            if (flags & READ_ONLY) {
+                ashmem_set_prot_region(fd, PROT_READ);
+            }
+        }
+    }
+}
+
+MemoryHeapBase::MemoryHeapBase(const char* device, size_t size, uint32_t flags)
+    : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
+      mDevice(0), mNeedUnmap(false)
+{
+    int fd = open(device, O_RDWR);
+    LOGE_IF(fd<0, "error opening %s: %s", device, strerror(errno));
+    if (fd >= 0) {
+        const size_t pagesize = getpagesize();
+        size = ((size + pagesize-1) & ~(pagesize-1));
+        if (mapfd(fd, size) == NO_ERROR) {
+            mDevice = device;
+        }
+    }
+}
+
+MemoryHeapBase::MemoryHeapBase(int fd, size_t size, uint32_t flags)
+    : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
+      mDevice(0), mNeedUnmap(false)
+{
+    const size_t pagesize = getpagesize();
+    size = ((size + pagesize-1) & ~(pagesize-1));
+    mapfd(dup(fd), size);
+}
+
+status_t MemoryHeapBase::init(int fd, void *base, int size, int flags, const char* device)
+{
+    if (mFD != -1) {
+        return INVALID_OPERATION;
+    }
+    mFD = fd;
+    mBase = base;
+    mSize = size;
+    mFlags = flags;
+    mDevice = device;
+    return NO_ERROR;
+}
+
+status_t MemoryHeapBase::mapfd(int fd, size_t size)
+{
+    if (size == 0) {
+        // try to figure out the size automatically
+#if HAVE_ANDROID_OS
+        // first try the PMEM ioctl
+        pmem_region reg;
+        int err = ioctl(fd, PMEM_GET_TOTAL_SIZE, &reg);
+        if (err == 0)
+            size = reg.len;
+#endif
+        if (size == 0) { // try fstat
+            struct stat sb;
+            if (fstat(fd, &sb) == 0)
+                size = sb.st_size;
+        }
+        // if it didn't work, let mmap() fail.
+    }
+
+    if ((mFlags & DONT_MAP_LOCALLY) == 0) {
+        void* base = (uint8_t*)mmap(0, size,
+                PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+        if (base == MAP_FAILED) {
+            LOGE("mmap(fd=%d, size=%u) failed (%s)",
+                    fd, uint32_t(size), strerror(errno));
+            close(fd);
+            return -errno;
+        }
+        //LOGD("mmap(fd=%d, base=%p, size=%lu)", fd, base, size);
+        mBase = base;
+        mNeedUnmap = true;
+    } else  {
+        mBase = 0; // not MAP_FAILED
+        mNeedUnmap = false;
+    }
+    mFD = fd;
+    mSize = size;
+    return NO_ERROR;
+}
+
+MemoryHeapBase::~MemoryHeapBase()
+{
+    dispose();
+}
+
+void MemoryHeapBase::dispose()
+{
+    int fd = android_atomic_or(-1, &mFD);
+    if (fd >= 0) {
+        if (mNeedUnmap) {
+            //LOGD("munmap(fd=%d, base=%p, size=%lu)", fd, mBase, mSize);
+            munmap(mBase, mSize);
+        }
+        mBase = 0;
+        mSize = 0;
+        close(fd);
+    }
+}
+
+int MemoryHeapBase::getHeapID() const {
+    return mFD;
+}
+
+void* MemoryHeapBase::getBase() const {
+    return mBase;
+}
+
+size_t MemoryHeapBase::getSize() const {
+    return mSize;
+}
+
+uint32_t MemoryHeapBase::getFlags() const {
+    return mFlags;
+}
+
+const char* MemoryHeapBase::getDevice() const {
+    return mDevice;
+}
+
+// ---------------------------------------------------------------------------
+}; // namespace android