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Major signal overhaul.  We no longer longjmp all over the place.
Instead, routines responsible to gathering user input (or in some
cases outputting data) catch the signals and set flags as needed.
Because of this some handlers are install without the SA_RESTART
flag so syscalls are not restarted and we can check the flag.  All
signal handlers are now safe.

This should make the flow of control a bit more grokable but the
code is still ugly.

/*	$OpenBSD: extern.h,v 1.18 2001/11/20 20:50:00 millert Exp $	*/
/*	$NetBSD: extern.h,v 1.7 1997/07/09 05:22:00 mikel Exp $	*/

/*-
 * Copyright (c) 1992, 1993
 *	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 University of
 *	California, Berkeley and its contributors.
 * 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	8.2 (Berkeley) 4/20/95
 *	$OpenBSD: extern.h,v 1.18 2001/11/20 20:50:00 millert Exp $
 */

struct name;
struct name *cat __P((struct name *, struct name *));
struct name *delname __P((struct name *, char []));
struct name *elide __P((struct name *));
struct name *extract __P((char [], int));
struct grouphead;
struct name *gexpand __P((struct name *, struct grouphead *, int, int));
struct name *nalloc __P((char [], int));
struct header;
struct name *outof __P((struct name *, FILE *, struct header *));
struct name *put __P((struct name *, struct name *));
struct name *tailof __P((struct name *));
struct name *usermap __P((struct name *));
FILE	*Fdopen __P((int, char *));
FILE	*Fopen __P((char *, char *));
FILE	*Popen __P((char *, char *));
FILE	*collect __P((struct header *, int));
char	*copy __P((char *, char *));
char	*copyin __P((char *, char **));
char	*detract __P((struct name *, int));
char	*expand __P((char *));
char	*getdeadletter __P((void));
char	*getname __P((int));
struct message;
char	*hfield __P((char [], struct message *));
FILE	*infix __P((struct header *, FILE *));
char	*ishfield __P((char [], char[], char *));
char	*name1 __P((struct message *, int));
char	*nameof __P((struct message *, int));
char	*nextword __P((char *, char *));
char	*readtty __P((char [], char []));
char 	*reedit __P((char *));
FILE	*run_editor __P((FILE *, off_t, int, int));
char	*salloc __P((int));
char	*savestr __P((char *));
FILE	*setinput __P((struct message *));
char	*skin __P((char *));
char	*skip_comment __P((char *));
char	*snarf __P((char [], int *));
char	*username __P((void));
char	*value __P((char []));
char	*vcopy __P((char []));
char	*yankword __P((char *, char []));
int	 Fclose __P((FILE *));
int	 More __P((void *));
int	 Pclose __P((FILE *));
int	 Respond __P((void *));
int	 Type __P((void *));
int	 _Respond __P((int []));
int	 _respond __P((int *));
void	 alter __P((char *));
int	 alternates __P((void *));
void	 announce __P((void));
int	 anyof __P((char *, char *));
int	 append __P((struct message *, FILE *));
int	 argcount __P((char **));
void	 assign __P((char [], char []));
int	 bangexp __P((char *, size_t));
int	 blankline __P((char []));
int	 charcount __P((char *, int));
int	 check __P((int, int));
void	 clearnew __P((void));
void	 clob1 __P((int));
int	 clobber __P((void *));
void	 close_all_files __P((void));
int	 cmatch __P((char *, char *));
int	 collabort __P((void));
void	 commands __P((void));
int	 copycmd __P((void *));
int	 core __P((void *));
int	 count __P((struct name *));
int	 delete __P((void *));
int	 delm __P((int []));
int	 deltype __P((void *));
void	 demail __P((void));
void	 dointr __P((void));
int	 dosh __P((void *));
int	 dot_lock __P((const char *, int, FILE *, const char *));
void	 dot_unlock __P((const char *));
int	 echo __P((void *));
int	 edit1 __P((int *, int));
int	 editor __P((void *));
int	 edstop __P((void));
int	 elsecmd __P((void *));
int	 endifcmd __P((void *));
int	 evalcol __P((int));
int	 execute __P((char [], int));
int	 exwrite __P((char [], FILE *, int));
void	 fail __P((char [], char []));
int	 file __P((void *));
struct grouphead *
	 findgroup __P((char []));
void	 findmail __P((char *, char *, int));
void	 fioint __P((int));
int	 first __P((int, int));
void	 fixhead __P((struct header *, struct name *));
void	 fmt __P((char *, struct name *, FILE *, int));
int	 folders __P((void *));
int	 forward __P((char [], FILE *, char *, int));
void	 free_child __P((int));
int	 from __P((void *));
off_t	 fsize __P((FILE *));
int	 getfold __P((char *, int));
int	 gethfield __P((FILE *, char [], int, char **));
int	 gethfromtty __P((struct header *, int));
int	 getmsglist __P((char *, int *, int));
int	 getrawlist __P((char [], char **, int));
int	 getuserid __P((char []));
int	 grabh __P((struct header *, int));
int	 group __P((void *));
int	 hash __P((char *));
void	 hdrint __P((int));
int	 headers __P((void *));
int	 help __P((void *));
void	 holdsigs __P((void));
int	 ifcmd __P((void *));
int	 igfield __P((void *));
struct ignoretab;
int	 ignore1 __P((char *[], struct ignoretab *, char *));
int	 ignoresig __P((int, struct sigaction *, sigset_t *));
int	 igshow __P((struct ignoretab *, char *));
void	 intr __P((int));
int	 inc __P((void *));
int	 incfile __P((void));
int	 isdate __P((char []));
int	 isdir __P((char []));
int	 isfileaddr __P((char *));
int	 ishead __P((char []));
int	 isign __P((char *, struct ignoretab []));
int	 isprefix __P((char *, char *));
void	 istrncpy __P((char *, char *, size_t));
const struct cmd *
	 lex __P((char []));
void	 load __P((char *));
struct var *
	 lookup __P((char []));
int	 mail __P((struct name *,
	    struct name *, struct name *, struct name *, char *));
void	 mail1 __P((struct header *, int));
void	 makemessage __P((FILE *, int));
void	 mark __P((int));
int	 markall __P((char [], int));
int	 marknew __P((void *));
int	 matchsender __P((char *, int));
int	 matchsubj __P((char *, int));
int	 mboxit __P((void *));
int	 member __P((char *, struct ignoretab *));
void	 mesedit __P((FILE *, int));
void	 mespipe __P((FILE *, char []));
int	 messize __P((void *));
int	 metamess __P((int, int));
int	 more __P((void *));
int	 newfileinfo __P((int));
int	 next __P((void *));
int	 null __P((void *));
struct headline;
void	 parse __P((char [], struct headline *, char []));
int	 pcmdlist __P((void *));
int	 pdot __P((void *));
int	 pipeit __P((void *, void *));
void	 prepare_child __P((sigset_t *, int, int));
int	 preserve __P((void *));
void	 prettyprint __P((struct name *));
void	 printgroup __P((char []));
void	 printhead __P((int));
int	 puthead __P((struct header *, FILE *, int));
int	 putline __P((FILE *, char *, int));
int	 pversion __P((void *));
int	 quit __P((void));
int	 quitcmd __P((void *));
int	 raise __P((int));
int	 readline __P((FILE *, char *, int, int *));
void	 register_file __P((FILE *, int, int));
void	 regret __P((int));
void	 relsesigs __P((void));
int	 respond __P((void *));
int	 retfield __P((void *));
int	 rexit __P((void *));
int	 rm __P((char *));
int	 run_command __P((char *cmd, sigset_t *nset, int infd, int outfd, ...));
int	 save __P((void *));
int	 save1 __P((char [], int, char *, struct ignoretab *));
void	 savedeadletter __P((FILE *));
int	 saveigfield __P((void *));
int	 savemail __P((char [], FILE *));
int	 saveretfield __P((void *));
int	 scan __P((char **));
void	 scaninit __P((void));
int	 schdir __P((void *));
int	 screensize __P((void));
int	 scroll __P((void *));
int	 sendmessage __P((struct message *, FILE *, struct ignoretab *, char *));
int	 sendmail __P((void *));
int	 set __P((void *));
int	 setfile __P((char *));
void	 setmsize __P((int));
void	 setptr __P((FILE *, off_t));
void	 setscreensize __P((void));
int	 shell __P((void *));
void	 sigchild __P((int));
void	 sort __P((char **));
int	 source __P((void *));
int	 spool_lock __P((void));
int	 spool_unlock __P((void));
void	 spreserve __P((void));
void	 sreset __P((void));
int	 start_command __P((char *cmd, sigset_t *nset, int infd, int outfd, ...));
int	 start_commandv __P((char *, sigset_t *, int, int, _BSD_VA_LIST_));
void	 statusput __P((struct message *, FILE *, char *));
void	 stop __P((int));
int	 stouch __P((void *));
int	 swrite __P((void *));
void	 tinit __P((void));
int	 top __P((void *));
void	 touch __P((struct message *));
void	 ttyint __P((int));
void	 ttystop __P((int));
int	 type __P((void *));
int	 type1 __P((int *, char *, int, int));
int	 undeletecmd __P((void *));
void	 unmark __P((int));
char	**unpack __P((struct name *, struct name *));
int	 unread __P((void *));
void	 unregister_file __P((FILE *));
int	 unset __P((void *));
int	 unstack __P((void));
void	 vfree __P((char *));
int	 visual __P((void *));
int	 wait_child __P((int));
int	 wait_command __P((int));
int	 writeback __P((FILE *));

extern char *__progname;
extern char *tmpdir;
extern const struct cmd *com; /* command we are running */