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/* -*- 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;
}
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