Update visibility

runtime/src/bpftime_shm_internal.cpp

@@ -389,10 +389,6 @@ bool bpftime_shm::is_exist_fake_fd(int fd) const
 	return manager->is_allocated(fd);
 }
 
-// Declare it as weak symbol, which could be overrided by other symbols
-const __attribute__((weak)) shm_open_type global_shm_open_type =
-	shm_open_type::SHM_NO_CREATE;
-
 bpftime_shm::bpftime_shm()
 {
 	spdlog::info("Global shm constructed. global_shm_open_type {} for {}",
@@ -511,4 +507,9 @@ bpftime_shm::get_software_perf_event_raw_buffer(int fd, size_t buffer_sz) const
 	const auto &handler = std::get<bpf_perf_event_handler>(get_handler(fd));
 	return handler.try_get_software_perf_data_raw_buffer(buffer_sz);
 }
+
+// Declare it as weak symbol, which could be overrided by other symbols
+extern const __attribute__((weak)) bpftime::shm_open_type global_shm_open_type =
+	bpftime::shm_open_type::SHM_NO_CREATE;
+
 } // namespace bpftime

runtime/test/bpf/replace.bpf.c

@@ -0,0 +1,19 @@
+#include "vmlinux.h"
+#include "bpf/bpf_tracing.h"
+#include "bpf/bpf_helpers.h"
+#include "ffi.bpf.h"
+
+static inline int add_func(int a, int b)
+{
+	return FFI_CALL_NAME_2("add_func", a, b);
+}
+
+static inline uint64_t print_func(char *str)
+{
+	return FFI_CALL_NAME_1("print_func", str);
+}
+
+int BPF_UPROBE(my_function, int parm1, char* str, char c) {
+	uint64_t n = print_func(str);
+    return n + add_func(parm1, c);
+}