Initial Contribution

1 files changed, 85 insertions, 0 deletions

diff --git a/libcutils/ashmem-dev.c b/libcutils/ashmem-dev.c
new file mode 100644
index 000000000..5e158af71
--- /dev/null
+++ b/libcutils/ashmem-dev.c
@@ -0,0 +1,85 @@
+/*
+ * 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 devices, which have our
+ * ashmem-enabled kernel. See ashmem-sim.c for the "fake" tmp-based version,
+ * used by the simulator.
+ */
+
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
+#include <linux/ashmem.h>
+#include <cutils/ashmem.h>
+
+#define ASHMEM_DEVICE	"/dev/ashmem"
+
+/*
+ * ashmem_create_region - creates a new ashmem region and returns the file
+ * descriptor, or <0 on error
+ *
+ * `name' is an optional label to give the region (visible in /proc/pid/maps)
+ * `size' is the size of the region, in page-aligned bytes
+ */
+int ashmem_create_region(const char *name, size_t size)
+{
+	int fd, ret;
+
+	fd = open(ASHMEM_DEVICE, O_RDWR);
+	if (fd < 0)
+		return fd;
+
+	if (name) {
+		char buf[ASHMEM_NAME_LEN];
+
+		strlcpy(buf, name, sizeof(buf));
+		ret = ioctl(fd, ASHMEM_SET_NAME, buf);
+		if (ret < 0)
+			goto error;
+	}
+
+	ret = ioctl(fd, ASHMEM_SET_SIZE, size);
+	if (ret < 0)
+		goto error;
+
+	return fd;
+
+error:
+	close(fd);
+	return ret;
+}
+
+int ashmem_set_prot_region(int fd, int prot)
+{
+	return ioctl(fd, ASHMEM_SET_PROT_MASK, prot);
+}
+
+int ashmem_pin_region(int fd, size_t offset, size_t len)
+{
+	struct ashmem_pin pin = { offset, len };
+	return ioctl(fd, ASHMEM_PIN, &pin);
+}
+
+int ashmem_unpin_region(int fd, size_t offset, size_t len)
+{
+	struct ashmem_pin pin = { offset, len };
+	return ioctl(fd, ASHMEM_UNPIN, &pin);
+}