Use TEMP_FAILURE_RETRY() for recvmsg() to prevent failing
unnecessarily from EINTR. Use PLOG(ERROR) in ueventd to display the
actual error if reading from the uevent socket does fail.
Test: build
Change-Id: I64a22698ce6ffc7573f75b57803551c7b6940e30
Increase size of the NETLINK_KOBJECT_UEVENT socket receive buffer to
16M. Also, use SO_RCVBUFFORCE to override any limits set by
/proc/sys/net/core/rmem_max.
We had a couple of instances, where we lost critical uevent messages due
to receive buffer overflows.
Bug: 119933843
Change-Id: I6aab183aa0194e173f9175b47c6beb0835cf6675
This change adds user namespace-awareness to uevent_kernel_* in
libcutils. Instead of assuming that root is always uid 0, it detects
whether the uid 0 is mapped in the current user namespace and returns
the appropriately mapped uid (or the kernel's "overflowuid" in case it
is not mapped).
In older kernels, or those where user namespaces are not enabled, this
still uses uid 0 for root.
Bug: 62378620
Test: bullhead networking still works
Test: Android in Chrome OS can now receive netlink-related messages
Change-Id: I7ea3454e8f38b9c70c65294d6b2a99e5a88f9d70
