ObjFW  Check-in [76861c3f78]

		;;
	esac

	AC_CHECK_HEADER(sys/socket.h, [
		AC_DEFINE(OF_HAVE_SYS_SOCKET_H, 1,
			[Whether we have sys/socket.h])
	])
	AC_CHECK_TYPE([struct sockaddr_storage], [
		AC_DEFINE(OF_HAVE_SOCKADDR_STORAGE, 1,
			[Whether we have struct sockaddr_storage])
	], [], [
		#ifdef OF_HAVE_SYS_TYPES_H
		# include <sys/types.h>
		#endif
		#ifdef OF_HAVE_SYS_SOCKET_H

			egrep_cpp_yes
			#endif
		], [
			AC_DEFINE(OF_HAVE_APPLETALK, 1,
			    [Whether we have AppleTalk])
			AC_SUBST(USE_SRCS_APPLETALK, '${SRCS_APPLETALK}')

			AC_CHECK_TYPE([struct ifreq], [
				AC_DEFINE(OF_HAVE_APPLETALK_IFCONFIG, 1,
				    m4_normalize([
					Whether AppleTalk interfaces
					can be configured
				]))
				AC_SUBST(OFATALKCFG, ofatalkcfg)
			], [], [

				[Whether we have select() or similar])
			AC_SUBST(OF_SELECT_KERNEL_EVENT_OBSERVER_M,
				"OFSelectKernelEventObserver.m")
		])
		;;
	esac

	AC_CHECK_HEADERS(ifaddrs.h netpacket/packet.h)
	AC_CHECK_FUNC(getifaddrs, [
		AC_DEFINE(OF_HAVE_GETIFADDRS, 1, [Whether we have getifaddrs()])
	])
	AC_CHECK_TYPES([struct sockaddr_ll], [], [], [
		#ifdef HAVE_NETPACKET_PACKET_H
		# include <netpacket/packet.h>
		#endif
	])

	AC_ARG_WITH(tls,
		AS_HELP_STRING([--with-tls], [
			enable TLS support using the specified library
			(yes, openssl, gnutls, securetransport or no)]))
	AS_IF([test x"$with_tls" = x""], [with_tls="yes"])

/**
 * @brief A key in the per-interface dictionary returned by
 *	  @ref networkInterfaces.
 *
 * Possible keys are:
 *
 *   * @ref OFNetworkInterfaceAddresses
 *   * @ref OFNetworkInterfaceEthernetAddress
 */
typedef OFConstantString *OFNetworkInterfaceInfoKey;

/**
 * @brief The addresses of a network interface.
 *
 * This maps to an @ref OFData of @ref OFSocketAddress.
 */
extern OFConstantString *const OFNetworkInterfaceAddresses;

/**
 * @brief The Ethernet address of a network interface.
 *
 * This maps to an @ref OFData.
 */
extern OFConstantString *const OFNetworkInterfaceEthernetAddress;
#endif

/**
 * @class OFSystemInfo OFSystemInfo.h ObjFW/OFSystemInfo.h
 *
 * @brief A class for querying information about the system.
 */

#if !defined(PATH_MAX) && defined(MAX_PATH)
# define PATH_MAX MAX_PATH
#endif

#ifdef HAVE_IFADDRS_H
# include <ifaddrs.h>
#endif
#ifdef HAVE_NETPACKET_PACKET_H
# include <netpacket/packet.h>
#endif

#if defined(OF_MACOS) || defined(OF_IOS)
/*
 * These have been dropped from newer iOS SDKs, however, their replacements are
 * not available on iOS < 10. This means it's impossible to search for the
 * paths when using a new SDK while targeting iOS 9 or earlier. To work around
 * this, we define those manually, only to be used when the replacements are

	uint32_t eax, ebx, ecx, edx;
};
#endif

#if defined(OF_HAVE_SOCKETS) && defined(OF_HAVE_GETIFADDRS)
OFConstantString *const OFNetworkInterfaceAddresses =
    @"OFNetworkInterfaceAddresses";
OFConstantString *const OFNetworkInterfaceEthernetAddress =
    @"OFNetworkInterfaceEthernetAddress";
#endif

static size_t pageSize = 4096;
static size_t numberOfCPUs = 1;
static OFString *operatingSystemName = nil;
static OFString *operatingSystemVersion = nil;

				interface = [OFMutableDictionary dictionary];
				[interfaces setObject: interface
					       forKey: interfaceName];
			}

			if (iter->ifa_addr == NULL)
				continue;

# if defined(HAVE_STRUCT_SOCKADDR_LL) && defined(AF_PACKET)
			if (iter->ifa_addr->sa_family == AF_PACKET) {
				const OFNetworkInterfaceInfoKey key =
				    OFNetworkInterfaceEthernetAddress;
				struct sockaddr_ll *sll = (struct sockaddr_ll *)
				    (void *)iter->ifa_addr;
				OFData *addr;

				/* ARP hardware address type 1 is Ethernet. */
				if (sll->sll_hatype != 1)
					continue;

				addr = [OFData dataWithItems: sll->sll_addr
						       count: sll->sll_halen];
				[interface setObject: addr forKey: key];
				continue;
			}
# endif

			addresses = [interface
			    objectForKey: OFNetworkInterfaceAddresses];
			if (addresses == nil) {
				addresses = [OFMutableData
				    dataWithItemSize: sizeof(OFSocketAddress)];
				[interface