Win32: additional error code NGX_EEXIST_FILE (ticket #910). On Windows there are two possible error codes which correspond to the EEXIST error code: ERROR_FILE_EXISTS used by CreateFile(CREATE_NEW), and ERROR_ALREADY_EXISTS used by CreateDirectory(). MoveFile() seems to use both: ERROR_ALREADY_EXISTS when moving within one filesystem, and ERROR_FILE_EXISTS when copying a file to a different drive.

/*
 * Copyright (C) Maxim Dounin
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>


#if (NGX_HAVE_DLOPEN)

char *
ngx_dlerror(void)
{
    char  *err;

    err = (char *) dlerror();

    if (err == NULL) {
        return "";
    }

    return err;
}

#endif