SSL: SSL_sendfile() support with kernel TLS. Requires OpenSSL 3.0 compiled with "enable-ktls" option. Further, KTLS needs to be enabled in kernel, and in OpenSSL, either via OpenSSL configuration file or with "ssl_conf_command Options KTLS;" in nginx configuration. On FreeBSD, kernel TLS is available starting with FreeBSD 13.0, and can be enabled with "sysctl kern.ipc.tls.enable=1" and "kldload ktls_ocf" to load a software backend, see man ktls(4) for details. On Linux, kernel TLS is available starting with kernel 4.13 (at least 5.2 is recommended), and needs kernel compiled with CONFIG_TLS=y (with CONFIG_TLS=m, which is used at least on Ubuntu 21.04 by default, the tls module needs to be loaded with "modprobe tls").

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


#ifndef _NGX_DLOPEN_H_INCLUDED_
#define _NGX_DLOPEN_H_INCLUDED_


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


#define NGX_HAVE_DLOPEN  1


#define ngx_dlopen(path)           LoadLibrary((char *) path)
#define ngx_dlopen_n               "LoadLibrary()"

#define ngx_dlsym(handle, symbol)  (void *) GetProcAddress(handle, symbol)
#define ngx_dlsym_n                "GetProcAddress()"

#define ngx_dlclose(handle)        (FreeLibrary(handle) ? 0 : -1)
#define ngx_dlclose_n              "FreeLibrary()"


char *ngx_dlerror(void);


#endif /* _NGX_DLOPEN_H_INCLUDED_ */