extern.h

tftp的示例代码,写得不错,值得一看

/*-
 * Copyright (c) 1994, 2000 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.
 * 4. Neither the name of the University nor the names of its contributors
 *    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.
 *
 *	@(#)extern.h	8.3 (Berkeley) 10/9/94
 */

struct timeval;
struct fd_set;

void    abort_remote (FILE *);
void    abortpt ();
void    abortrecv ();
void    abortsend ();
void	account (int, char **);
int	another (int *, char ***, char *);
void	blkfree (char **);
void	cd (int, char **);
void	cdup (int, char **);
void	changetype (int, int);
void	cmdabort ();
void	cmdscanner (int);
int	command (const char *fmt, ...);
int	confirm (char *, char *);
FILE   *dataconn (char *);
void	delete (int, char **);
void	disconnect (int, char **);
void	do_chmod (int, char **);
void	do_umask (int, char **);
void	domacro (int, char **);
char   *domap (char *);
void	doproxy (int, char **);
char   *dotrans (char *);
void	fatal (char *);
void	get (int, char **);
struct cmd *getcmd (char *);
int	getit (int, char **, int, char *);
int	getreply (int);
char   *globulize (char *);
char   *gunique (char *);
void	help (int, char **);
char   *hookup (char *, int);
void	site_idle (int, char **);
int     initconn (void);
void	intr ();
void	lcd (int, char **);
int	login (char *);
void	lostpeer ();
void	ls (int, char **);
void	mabort (int);
void	macdef (int, char **);
void	makeargv (void);
void	makedir (int, char **);
void	mdelete (int, char **);
void	mget (int, char **);
void	mls (int, char **);
void	modtime (int, char **);
void	mput (int, char **);
char   *onoff (int);
void	newer (int, char **);
void	proxabort ();
void    proxtrans (char *, char *, char *);
void    psabort ();
void    pswitch (int);
void    ptransfer (char *, long, struct timeval *, struct timeval *);
void	put (int, char **);
void	pwd (int, char **);
void	quit (int, char **);
void	quote (int, char **);
void	quote1 (char *, int, char **);
void    recvrequest (char *, char *, char *, char *, int);
void	reget (int, char **);
char   *remglob (char **, int);
void	removedir (int, char **);
void	renamefile (int, char **);
void    reset (int, char **);
void	restart (int, char **);
void	rmthelp (int, char **);
void	rmtstatus (int, char **);
int	ruserpass (char *, char **, char **, char **);
void    sendrequest (char *, char *, char *, int);
void	setascii (int, char **);
void	setbell (int, char **);
void	setbinary (int, char **);
void	setcase (int, char **);
void	setcr (int, char **);
void	setdebug (int, char **);
void	setform (int, char **);
void	setftmode (int, char **);
void	setglob (int, char **);
void	sethash (int, char **);
void	setnmap (int, char **);
void	setntrans (int, char **);
void	setpassive (int, char **);
void	setpeer (int, char **);
void	setport (int, char **);
void	setprompt (int, char **);
void	setrunique (int, char **);
void	setstruct (int, char **);
void	setsunique (int, char **);
void	settenex (int, char **);
void	settrace (int, char **);
void	settype (int, char **);
void	setverbose (int, char **);
void	shell (int, char **);
void	site (int, char **);
void	sizecmd (int, char **);
char   *slurpstring (void);
void	status (int, char **);
void	syst (int, char **);
void    tvsub (struct timeval *, struct timeval *, struct timeval *);
void	user (int, char **);

extern jmp_buf	abortprox;
extern int	abrtflag;
extern FILE	*cout;
extern int	data;
extern char    *home;
extern jmp_buf	jabort;
extern int	proxy;
extern char	reply_string[];
extern off_t	restart_point;
extern int	NCMDS;