tree 2c4e7b3f0657b43e1b61c9b3e3569f405e4a101a
parent 9759c00041f21d4a4c5696f0be1f1b21da4faffe
author Tri Vo <trong@google.com> 1548869059 -0800
committer Tri Vo <trong@google.com> 1549300682 -0800

ashmemd: daemon that provides /dev/ashmem fds

Motivation: we want to replace /dev/ashmem with memfd. To do so we need
all usage of /dev/ashmem to go through libcutils. Once that happens, we
migrate libcutils to use memfd.

ashmemd is our way to enforce that apps are using the existing
ASharedMemory_create API and not bypassing it to go directly to
/dev/ashmem.

ashmemd serves opened file descriptors. The following way should be the
only way for apps to open an fd to /dev/ashmem:
app -> ASharedMemory_create -> libcutils -> ashmemd -> /dev/ashmem

Bug: 113362644
Test: ashmemd_test
Change-Id: I9068cefa950f91dba0f1b75daca23f02d933b1c8