add another C-wrapper: osv_run_app()

In preparation to support building and running ZFS images on the kernel built with most symbols hidden, this patch adds new C function - osv_run_app() - that wraps code to run an arbitrary app. This will allow an application like mkfs.so to be changed to not have to depend on C++ symbols like osv::run() from OSv kernel. Refs #1186 Signed-off-by: Waldemar Kozaczuk <[email protected]>
cloudius-systems · Jul 7, 2022 · fa3b38e · fa3b38e
1 parent d1d0dd1
commit fa3b38e
Show file tree

Hide file tree

Showing 3 changed files with 15 additions and 0 deletions.
diff --git a/core/osv_c_wrappers.cc b/core/osv_c_wrappers.cc
@@ -143,6 +143,15 @@ void osv_current_app_on_termination_request(void (*handler)()) {
     osv::this_application::on_termination_request(handler);
 }
 
+extern "C" OSV_MODULE_API
+int osv_run_app(const char *app_path, const char *args[], int args_len) {
+    int ret;
+    std::vector<std::string> _args(args, args + args_len);
+    auto ok = run(app_path, _args, &ret);
+    assert(ok);
+    return ret;
+}
+
 extern bool verbose;
 extern "C" OSV_MODULE_API
 bool osv_debug_enabled() {

diff --git a/exported_symbols/osv_module_api.symbols b/exported_symbols/osv_module_api.symbols
@@ -7,4 +7,5 @@ osv_get_all_app_threads
 osv_get_all_threads
 osv_hypervisor_name
 osv_processor_features
+osv_run_app
 osv_version
diff --git a/include/osv/osv_c_wrappers.h b/include/osv/osv_c_wrappers.h
@@ -127,6 +127,11 @@ bool osv_debug_enabled();
  */
 void osv_current_app_on_termination_request(void (*handler)());
 
+/*
+ * Start an app and wait until it terminates
+ */
+int osv_run_app(const char *app_path, const char *args[], int args_len);
+
 #ifdef __cplusplus
 }
 #endif