make libsql_enable_tracing safe to call multiple times

Author: sivukhin

bindings/c/include/libsql.h

@@ -61,7 +61,7 @@ typedef struct {
 extern "C" {
 #endif // __cplusplus
 
-void libsql_enable_tracing(void);
+int libsql_enable_tracing(void);
 
 int libsql_sync(libsql_database_t db, const char **out_err_msg);
 

bindings/c/src/lib.rs

@@ -32,8 +32,12 @@ unsafe fn set_err_msg(msg: String, output: *mut *const std::ffi::c_char) {
 }
 
 #[no_mangle]
-pub unsafe extern "C" fn libsql_enable_tracing() {
-    tracing_subscriber::fmt::init();
+pub unsafe extern "C" fn libsql_enable_tracing() -> std::ffi::c_int {
+    if tracing_subscriber::fmt::try_init().is_ok() {
+        1
+    } else {
+        0
+    }
 }
 
 #[no_mangle]