1 files changed, 101 insertions, 0 deletions
diff --git a/fluent-bit/src/flb_dlfcn_win32.c b/fluent-bit/src/flb_dlfcn_win32.c
new file mode 100644
index 000000000..1ca398f51
--- /dev/null
+++ b/fluent-bit/src/flb_dlfcn_win32.c
@@ -0,0 +1,101 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2022 The Fluent Bit Authors
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#include <fluent-bit/flb_compat.h>
+
+static CHAR dlerrorbuf[512];
+static BOOL has_error_message = FALSE;
+
+static void store_error(void)
+{
+    DWORD err = GetLastError();
+    if (err == NO_ERROR) {
+        return;
+    }
+
+    if (!FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM |
+                        FORMAT_MESSAGE_IGNORE_INSERTS,
+                        NULL,
+                        err,
+                        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+                        dlerrorbuf,
+                        _countof(dlerrorbuf), NULL))
+        dlerrorbuf[0] = '\0';
+
+    has_error_message = TRUE;
+}
+
+__declspec(noinline)
+void *dlopen(const char *filename, int _flag)
+{
+    HMODULE handle;
+
+    handle = LoadLibrary(filename);
+    if (handle == NULL) {
+        store_error();
+        return NULL;
+    }
+    return (void *)handle;
+}
+
+char *dlerror(void)
+{
+    char *errorptr = dlerrorbuf;
+
+    /* POSIX requests that the second consective dlerror() calling should
+     * be return NULL.*/
+    if (!has_error_message)
+    {
+        return NULL;
+    }
+
+    has_error_message = FALSE;
+
+    return errorptr;
+}
+
+__declspec(noinline)
+void *dlsym(void *handle, const char *name)
+{
+    FARPROC *symbol;
+    symbol = NULL;
+
+    symbol = GetProcAddress((HMODULE) handle, name);
+    if (symbol == NULL) {
+        store_error();
+        return NULL;
+    }
+
+    return (void *)symbol;
+}
+
+int dlclose(void *handle)
+{
+    BOOL result;
+
+    result = FreeLibrary((HMODULE) handle);
+    if (!result)
+        store_error();
+
+    /* dlcose(3) returns 0 on success, and nonzero on error. */
+    /* FreeLibrary returns nonzero on success, and 0 on error. */
+    /* ref:
+     * https://docs.microsoft.com/en-us/windows/desktop/api/libloaderapi/nf-libloaderapi-freelibrary */
+    return !result;
+}