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binder: Add BINDER_GET_NODE_INFO_FOR_REF ioctl.

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This allows the context manager to retrieve information about nodes
that it holds a reference to, such as the current number of
references to those nodes.

Such information can for example be used to determine whether the
servicemanager is the only process holding a reference to a node.
This information can then be passed on to the process holding the
node, which can in turn decide whether it wants to shut down to
reduce resource usage.

Signed-off-by: Martijn Coenen <maco@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Martijn Coenen 2018-09-07 15:38:37 +02:00 • committed by Greg Kroah-Hartman
parent 6b6642dadd
commit b7e6a8961b
2 changed files with 65 additions and 0 deletions
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10
include/uapi/linux/android/binder.h
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@ -200,6 +200,15 @@ struct binder_node_debug_info {
__u32 has_weak_ref;
};
struct binder_node_info_for_ref {
__u32 handle;
__u32 strong_count;
__u32 weak_count;
__u32 reserved1;
__u32 reserved2;
__u32 reserved3;
};
#define BINDER_WRITE_READ _IOWR('b', 1, struct binder_write_read)
#define BINDER_SET_IDLE_TIMEOUT _IOW('b', 3, __s64)
#define BINDER_SET_MAX_THREADS _IOW('b', 5, __u32)
@ -208,6 +217,7 @@ struct binder_node_debug_info {
#define BINDER_THREAD_EXIT _IOW('b', 8, __s32)
#define BINDER_VERSION _IOWR('b', 9, struct binder_version)
#define BINDER_GET_NODE_DEBUG_INFO _IOWR('b', 11, struct binder_node_debug_info)
#define BINDER_GET_NODE_INFO_FOR_REF _IOWR('b', 12, struct binder_node_info_for_ref)
/*
* NOTE: Two special error codes you should check for when calling