Added ashmem_get_size_region() function.
This is needed by the MemoryFile changes in
https://android-git.corp.google.com/g/2714
where it is used to find out whether a file descriptor
refers to an ashmem region.
diff --git a/libcutils/ashmem-host.c b/libcutils/ashmem-host.c
index dbb52bc..f03e130 100644
--- a/libcutils/ashmem-host.c
+++ b/libcutils/ashmem-host.c
@@ -92,3 +92,23 @@
{
return ASHMEM_IS_UNPINNED;
}
+
+int ashmem_get_size_region(int fd)
+{
+ struct stat buf;
+ int result;
+
+ result = fstat(fd, &buf);
+ if (result == -1) {
+ return -1;
+ }
+
+ // Check if this is an "ashmem" region.
+ // TODO: This is very hacky, and can easily break. We need some reliable indicator.
+ if (!(buf.st_nlink == 0 && S_ISREG(buf.st_mode))) {
+ errno = ENOTTY;
+ return -1;
+ }
+
+ return (int)buf.st_size; // TODO: care about overflow (> 2GB file)?
+}