diff --git a/libc/bionic/fdsan.cpp b/libc/bionic/fdsan.cpp
index dd3a96e..4ebc796 100644
--- a/libc/bionic/fdsan.cpp
+++ b/libc/bionic/fdsan.cpp
@@ -106,30 +106,8 @@
 }
 
 void __libc_init_fdsan() {
-  constexpr auto default_level = ANDROID_FDSAN_ERROR_LEVEL_WARN_ONCE;
-  const prop_info* pi = __system_property_find(kFdsanPropertyName);
-  if (!pi) {
-    android_fdsan_set_error_level(default_level);
-    return;
-  }
-  __system_property_read_callback(
-      pi,
-      [](void*, const char*, const char* value, uint32_t) {
-        if (strcasecmp(value, "1") == 0 || strcasecmp(value, "fatal") == 0) {
-          android_fdsan_set_error_level(ANDROID_FDSAN_ERROR_LEVEL_FATAL);
-        } else if (strcasecmp(value, "warn") == 0) {
-          android_fdsan_set_error_level(ANDROID_FDSAN_ERROR_LEVEL_WARN_ALWAYS);
-        } else if (strcasecmp(value, "warn_once") == 0) {
-          android_fdsan_set_error_level(ANDROID_FDSAN_ERROR_LEVEL_WARN_ONCE);
-        } else {
-          if (strlen(value) != 0 && strcasecmp(value, "0") != 0) {
-            async_safe_format_log(ANDROID_LOG_ERROR, "libc",
-                                  "debug.fdsan set to unknown value '%s', disabling", value);
-          }
-          android_fdsan_set_error_level(default_level);
-        }
-      },
-      nullptr);
+  constexpr auto default_level = ANDROID_FDSAN_ERROR_LEVEL_FATAL;
+  android_fdsan_set_error_level_from_property(default_level);
 }
 
 static FdTable& GetFdTable() {
@@ -355,6 +333,45 @@
   return atomic_exchange(&GetFdTable().error_level, new_level);
 }
 
+android_fdsan_error_level android_fdsan_set_error_level_from_property(
+    android_fdsan_error_level default_level) {
+  const prop_info* pi = __system_property_find(kFdsanPropertyName);
+  if (!pi) {
+    return android_fdsan_set_error_level(default_level);
+  }
+
+  struct callback_data {
+    android_fdsan_error_level default_value;
+    android_fdsan_error_level result;
+  };
+
+  callback_data data;
+  data.default_value = default_level;
+
+  __system_property_read_callback(
+      pi,
+      [](void* arg, const char*, const char* value, uint32_t) {
+        callback_data* data = static_cast<callback_data*>(arg);
+
+        if (strcasecmp(value, "1") == 0 || strcasecmp(value, "fatal") == 0) {
+          data->result = android_fdsan_set_error_level(ANDROID_FDSAN_ERROR_LEVEL_FATAL);
+        } else if (strcasecmp(value, "warn") == 0) {
+          data->result = android_fdsan_set_error_level(ANDROID_FDSAN_ERROR_LEVEL_WARN_ALWAYS);
+        } else if (strcasecmp(value, "warn_once") == 0) {
+          data->result = android_fdsan_set_error_level(ANDROID_FDSAN_ERROR_LEVEL_WARN_ONCE);
+        } else {
+          if (strlen(value) != 0 && strcasecmp(value, "0") != 0) {
+            async_safe_format_log(ANDROID_LOG_ERROR, "libc",
+                                  "debug.fdsan set to unknown value '%s', disabling", value);
+          }
+          data->result = android_fdsan_set_error_level(data->default_value);
+        }
+      },
+      &data);
+
+  return data.result;
+}
+
 int close(int fd) {
   int rc = android_fdsan_close_with_tag(fd, 0);
   if (rc == -1 && errno == EINTR) {