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Commit a117f25b authored Jan 09, 2019 by Vic Yang

libvndksupport: Add android_is_in_vendor_process()

In preparation for cleaning up conditionally compiled VNDK libraries,
we need a function that determines if the current process is running in
the system process or the vendor process.

Bug: 119423884
Test: Add a dummy VNDK library that prints different string in system
      vs vendor process.  Use the library in different processs and
      check the output.

Change-Id: Ic00927d8eadd2a21fcba9cb64cc93eaadd5bdd2d

parent c7b5c4fa

libvndksupport/include/vndksupport/linker.h

+10 −0

Original line number	Diff line number	Diff line
		@@ -20,6 +20,16 @@
		extern "C" {
		#endif

		/*
		* Returns whether the current process is a vendor process.
		*
		* Note that this is only checking what process is running and has nothing to
		* do with what namespace the caller is loaded at. For example, a VNDK-SP
		* library loaded by SP-HAL calling this function may still get a 'false',
		* because it is running in a system process.
		*/
		int android_is_in_vendor_process();

		void* android_load_sphal_library(const char* name, int flag);

		int android_unload_sphal_library(void* handle);

libvndksupport/libvndksupport.map.txt

+1 −0

Original line number	Diff line number	Diff line
		LIBVNDKSUPPORT {
		global:
		android_is_in_vendor_process; # vndk apex
		android_load_sphal_library; # vndk apex
		android_unload_sphal_library; # vndk apex
		local:

libvndksupport/linker.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -45,6 +45,17 @@ static struct android_namespace_t* get_vendor_namespace() {
		return vendor_namespace;
		}

		int android_is_in_vendor_process() {
		if (android_get_exported_namespace == NULL) {
		ALOGD("android_get_exported_namespace() not available. Assuming system process.");
		return 0;
		}

		// In vendor process, 'vndk' namespace is not visible, whereas in system
		// process, it is.
		return android_get_exported_namespace("vndk") == NULL;
		}

		void* android_load_sphal_library(const char* name, int flag) {
		struct android_namespace_t* vendor_namespace = get_vendor_namespace();
		if (vendor_namespace != NULL) {