libroot: make API version available.

Change-Id: I370d5c8e9b4f076e7f115ca6c87bc7f943d36c17
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1850
Reviewed-by: Rene Gollent <[email protected]>

headers/private/libroot/libroot_private.h

@@ -19,6 +19,7 @@ extern "C" {
 #endif
 
 extern int __gABIVersion;
+extern int __gAPIVersion;
 
 extern char _single_threaded;
 	/* This determines if a process runs single threaded or not */

headers/private/runtime_loader/runtime_loader.h

@@ -57,6 +57,7 @@ struct rld_export {
 	const struct user_space_program_args *program_args;
 	const void* commpage_address;
 	int abi_version;
+	int api_version;
 };
 
 extern struct rld_export *__gRuntimeLoader;

src/system/libroot/libroot_init.c

@@ -30,6 +30,7 @@ int __libc_argc;
 char **__libc_argv;
 
 int __gABIVersion;
+int __gAPIVersion;
 int32 __gCPUCount;
 
 char _single_threaded = true;
@@ -51,6 +52,7 @@ initialize_before(image_id imageID)
 	char *programPath = __gRuntimeLoader->program_args->args[0];
 	__gCommPageAddress = __gRuntimeLoader->commpage_address;
 	__gABIVersion = __gRuntimeLoader->abi_version;
+	__gAPIVersion = __gRuntimeLoader->api_version;
 
 	if (programPath) {
 		if ((__progname = strrchr(programPath, '/')) == NULL)

src/system/runtime_loader/elf_load_image.cpp

@@ -641,7 +641,7 @@ load_image(char const* name, image_type type, const char* rpath,
 		#endif
 	}
 
-	set_abi_version(image->abi);
+	set_abi_api_version(image->abi, image->api_version);
 
 	// init gcc version dependent image flags
 	// symbol resolution strategy

src/system/runtime_loader/export.cpp

@@ -93,13 +93,18 @@ rldexport_init(void)
 
 
 /*!	Is called for all images, and sets the minimum ABI version found to the
-	gRuntimeLoader.abi_version field.
+	gRuntimeLoader.abi_version field and the minimum API version found to the
+	gRuntimeLoader.api_version field.
 */
 void
-set_abi_version(int abi_version)
+set_abi_api_version(int abi_version, int api_version)
 {
 	if (gRuntimeLoader.abi_version == 0
 		|| gRuntimeLoader.abi_version > abi_version) {
 		gRuntimeLoader.abi_version = abi_version;
 	}
+	if (gRuntimeLoader.api_version == 0
+		|| gRuntimeLoader.api_version > api_version) {
+		gRuntimeLoader.api_version = api_version;
+	}
 }

src/system/runtime_loader/runtime_loader_private.h

@@ -99,7 +99,7 @@ status_t elf64_verify_header(void *header, size_t length);
 #endif	// _COMPAT_MODE
 void rldelf_init(void);
 void rldexport_init(void);
-void set_abi_version(int abi_version);
+void set_abi_api_version(int abi_version, int api_version);
 status_t elf_reinit_after_fork();
 
 status_t heap_init();