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+/*
+ * Copyright (c) 1994, 1995, 1996
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the Computer Systems
+ * Engineering Group at Lawrence Berkeley Laboratory.
+ * 4. Neither the name of the University nor of the Laboratory may be used
+ * to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef ftmacros_h
+#define ftmacros_h
+
+/*
+ * Define some feature test macros to make sure that everything we want
+ * to be declared gets declared.
+ *
+ * On some UN*Xes we need to force strtok_r() to be declared.
+ * We do *NOT* want to define _POSIX_C_SOURCE, as that tends
+ * to make non-POSIX APIs that we use unavailable.
+ * XXX - is there no portable way to say "please pollute the
+ * namespace to the maximum extent possible"?
+ */
+#if defined(sun) || defined(__sun)
+ /*
+ * On Solaris Clang defines __EXTENSIONS__ automatically.
+ */
+ #ifndef __EXTENSIONS__
+ #define __EXTENSIONS__
+ #endif
+
+ /*
+ * We also need to define _XPG4_2 in order to get
+ * the Single UNIX Specification version of
+ * recvmsg().
+ */
+ #define _XPG4_2
+#elif defined(_hpux) || defined(hpux) || defined(__hpux)
+ #define _REENTRANT
+
+ /*
+ * We need this to get the versions of socket functions that
+ * use socklen_t. Define it only if it's not already defined,
+ * so we don't get redefiniton warnings.
+ */
+ #ifndef _XOPEN_SOURCE_EXTENDED
+ #define _XOPEN_SOURCE_EXTENDED
+ #endif
+
+ /*
+ * XXX - the list of PA-RISC options for GCC makes it sound as if
+ * building code that uses a particular vintage of UNIX API/ABI
+ * is complicated:
+ *
+ * https://gcc.gnu.org/onlinedocs/gcc/HPPA-Options.html
+ *
+ * See the description of the -munix flag.
+ *
+ * We probably want libpcap to work with programs built for any
+ * UN*X standard. I'm not sure whether that's possible and, if
+ * it is, what sort of stuff it'd have to do.
+ *
+ * It might also be a requirement that we build with a special
+ * flag to allow the library to be used with threaded code, at
+ * least with HP's C compiler; hopefully doing so won't make it
+ * *not* work with *un*-threaded code.
+ */
+#else
+ /*
+ * Turn on _GNU_SOURCE to get everything GNU libc has to offer,
+ * including asprintf(), if we're using GNU libc.
+ *
+ * Unfortunately, one thing it has to offer is a strerror_r()
+ * that's not POSIX-compliant, but we deal with that in
+ * pcap_fmt_errmsg_for_errno().
+ *
+ * We don't limit this to, for example, Linux and Cygwin, because
+ * this might, for example, be GNU/HURD or one of Debian's kFreeBSD
+ * OSes ("GNU/FreeBSD").
+ */
+ #define _GNU_SOURCE
+
+ /*
+ * We turn on both _DEFAULT_SOURCE and _BSD_SOURCE to try to get
+ * the BSD u_XXX types, such as u_int and u_short, defined. We
+ * define _DEFAULT_SOURCE first, so that newer versions of GNU libc
+ * don't whine about _BSD_SOURCE being deprecated; we still have
+ * to define _BSD_SOURCE to handle older versions of GNU libc that
+ * don't support _DEFAULT_SOURCE.
+ *
+ * But, if it's already defined, don't define it, so that we don't
+ * get a warning of it being redefined if it's defined as, for
+ * example, 1.
+ */
+ #ifndef _DEFAULT_SOURCE
+ #define _DEFAULT_SOURCE
+ #endif
+ /* Avoid redefining _BSD_SOURCE if it's already defined as for ex. 1 */
+ #ifndef _BSD_SOURCE
+ #define _BSD_SOURCE
+ #endif
+#endif
+
+#endif