am 3f627205: Merge change 2875 into donut
Merge commit '3f6272056275a00c30c07394d63bbe81cc9c5eba'
* commit '3f6272056275a00c30c07394d63bbe81cc9c5eba':
Added ashmem_get_size_region() function.
diff --git a/include/cutils/ashmem.h b/include/cutils/ashmem.h
index fd71352..0683bf2 100644
--- a/include/cutils/ashmem.h
+++ b/include/cutils/ashmem.h
@@ -18,6 +18,7 @@
int ashmem_set_prot_region(int fd, int prot);
int ashmem_pin_region(int fd, size_t offset, size_t len);
int ashmem_unpin_region(int fd, size_t offset, size_t len);
+int ashmem_get_size_region(int fd);
#ifdef __cplusplus
}
diff --git a/libcutils/ashmem-dev.c b/libcutils/ashmem-dev.c
index 5e158af..8b71f87 100644
--- a/libcutils/ashmem-dev.c
+++ b/libcutils/ashmem-dev.c
@@ -83,3 +83,8 @@
struct ashmem_pin pin = { offset, len };
return ioctl(fd, ASHMEM_UNPIN, &pin);
}
+
+int ashmem_get_size_region(int fd)
+{
+ return ioctl(fd, ASHMEM_GET_SIZE, NULL);
+}
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)?
+}