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The C and C++ Include Header Files

cat -n /usr/include/openssl/e_ostime.h

     1	/*
     2	 * Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.
     3	 *
     4	 * Licensed under the Apache License 2.0 (the "License").  You may not use
     5	 * this file except in compliance with the License.  You can obtain a copy
     6	 * in the file LICENSE in the source distribution or at
     7	 * https://www.openssl.org/source/license.html
     8	 */
     9	
    10	#ifndef OPENSSL_E_OSTIME_H
    11	#define OPENSSL_E_OSTIME_H
    12	#pragma once
    13	
    14	#include <openssl/macros.h>
    15	#include <openssl/opensslconf.h>
    16	#include <openssl/e_os2.h>
    17	
    18	/*
    19	 * This header guarantees that 'struct timeval' will be available. It includes
    20	 * the minimum headers needed to facilitate this. This may still be a
    21	 * substantial set of headers on some platforms (e.g. <winsock2.h> on Win32).
    22	 */
    23	
    24	#if defined(OPENSSL_SYS_WINDOWS)
    25	#if !defined(_WINSOCKAPI_)
    26	/*
    27	 * winsock2.h defines _WINSOCK2API_ and both winsock2.h and winsock.h define
    28	 * _WINSOCKAPI_. Both of these provide struct timeval. Don't include
    29	 * winsock2.h if either header has been included to avoid breakage with
    30	 * applications that prefer to use <winsock.h> over <winsock2.h>.
    31	 */
    32	#include <winsock2.h>
    33	#endif
    34	#else
    35	#include <sys/time.h>
    36	#endif
    37	
    38	#endif