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diff --git a/ncat/sys_wrap.h b/ncat/sys_wrap.h
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+/***************************************************************************
+ * sys_wrap.h                                                              *
+ ***********************IMPORTANT NMAP LICENSE TERMS************************
+ *
+ * The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap
+ * Project"). Nmap is also a registered trademark of the Nmap Project.
+ *
+ * This program is distributed under the terms of the Nmap Public Source
+ * License (NPSL). The exact license text applying to a particular Nmap
+ * release or source code control revision is contained in the LICENSE
+ * file distributed with that version of Nmap or source code control
+ * revision. More Nmap copyright/legal information is available from
+ * https://nmap.org/book/man-legal.html, and further information on the
+ * NPSL license itself can be found at https://nmap.org/npsl/ . This
+ * header summarizes some key points from the Nmap license, but is no
+ * substitute for the actual license text.
+ *
+ * Nmap is generally free for end users to download and use themselves,
+ * including commercial use. It is available from https://nmap.org.
+ *
+ * The Nmap license generally prohibits companies from using and
+ * redistributing Nmap in commercial products, but we sell a special Nmap
+ * OEM Edition with a more permissive license and special features for
+ * this purpose. See https://nmap.org/oem/
+ *
+ * If you have received a written Nmap license agreement or contract
+ * stating terms other than these (such as an Nmap OEM license), you may
+ * choose to use and redistribute Nmap under those terms instead.
+ *
+ * The official Nmap Windows builds include the Npcap software
+ * (https://npcap.com) for packet capture and transmission. It is under
+ * separate license terms which forbid redistribution without special
+ * permission. So the official Nmap Windows builds may not be redistributed
+ * without special permission (such as an Nmap OEM license).
+ *
+ * Source is provided to this software because we believe users have a
+ * right to know exactly what a program is going to do before they run it.
+ * This also allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to submit your changes as a Github PR
+ * or by email to the dev@nmap.org mailing list for possible incorporation into
+ * the main distribution. Unless you specify otherwise, it is understood that
+ * you are offering us very broad rights to use your submissions as described in
+ * the Nmap Public Source License Contributor Agreement. This is important
+ * because we fund the project by selling licenses with various terms, and also
+ * because the inability to relicense code has caused devastating problems for
+ * other Free Software projects (such as KDE and NASM).
+ *
+ * The free version of Nmap is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Warranties,
+ * indemnification and commercial support are all available through the
+ * Npcap OEM program--see https://nmap.org/oem/
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifndef SYS_WRAP_H
+#define SYS_WRAP_H
+
+#include "nbase.h"
+
+#include "util.h"
+
+#ifndef WIN32
+#include <unistd.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <sys/select.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+#else
+#define pid_t int
+#define mode_t int
+#define uid_t int
+#define socklen_t int
+#define uint16_t int
+#define ssize_t int
+#include <WinDef.h>
+#endif
+
+#include <sys/stat.h>
+#include <stdarg.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <signal.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+
+/* need an autoconf to check for this */
+typedef void (*sighandler_t)(int);
+
+void *Calloc(size_t nmemb, size_t size);
+int Close(int fd);
+int Connect(int sockfd, const struct sockaddr *serv_addr, socklen_t addrlen);
+int Dup2(int oldfd, int newfd);
+int Listen(int s, int backlog);
+int Open(const char *pathname, int flags, mode_t mode);
+ssize_t Read(int fd, void *buf, size_t count);
+int Setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen);
+sighandler_t Signal(int signum, sighandler_t handler);
+int Socket(int domain, int type, int protocol);
+char *Strdup(const char *s);
+ssize_t Write(int fd, const void *buf, size_t count);
+
+#endif