/************************************************************************
 * This program is Copyright (C) 1986-1996 by Jonathan Payne.  JOVE is  *
 * provided to you without charge, and with no warranty.  You may give  *
 * away copies of JOVE, including sources, provided that this notice is *
 * included in all the files.                                           *
 ************************************************************************/

#include "jove.h"

#ifdef IPROCS	/* the body is the rest of this file */

#include <signal.h>

#include "re.h"
#include "jctype.h"
#include "disp.h"
#include "fp.h"
#include "sysprocs.h"
#include "iproc.h"
#include "ask.h"
#include "extend.h"
#include "fmt.h"
#include "insert.h"
#include "marks.h"
#include "move.h"
#include "proc.h"
#include "wind.h"

#ifdef USE_KILLPG
# ifndef FULL_UNISTD
extern int	UNMACRO(killpg) proto((int /*pgrp*/, int /*sig*/));
# endif
#else /* !USE_KILLPG */
#define killpg(pid, sig)	kill(-(pid), (sig))
#endif /* USE_KILLPG */

#include <errno.h>

struct process {
	Process	p_next;
#ifdef PIPEPROCS
	int	p_toproc;	/* write end of pipe to process */
	pid_t	p_portpid,	/* pid of direct child (the portsrv) */
		p_pid;		/* pid of real child i.e. not portsrv */
	bool	p_portlive;	/* is portsrv still live? */
#else
	int	p_fd;		/* file descriptor of pty? opened r/w */
# define	p_portpid	p_pid	/* pid of direct child (the shell) */
	pid_t	p_pid;		/* pid of child (the shell) */
#endif
	Buffer	*p_buffer;	/* add output to end of this buffer */
	char	*p_name;	/* ... */
	int	p_io_state;	/* state of communication with child and descendents */
#		define IO_NEW	0	/* brand new, process has not yet sent output */
#		define IO_RUNNING	1	/* just running */
#		define IO_EOFED	2	/* we have sent EOF, or have received it */
	int	p_child_state;	/* state of child process, as disclosed by SIGCHLD/wait */
#		define C_LIVE	0	/* no news is good news */
#		define C_STOPPED	1
#		define C_EXITED	2
#		define C_KILLED	3
	int	p_reason;	/* If killed, p_reason is the signal;
				   if exited, it is the the exit code */
	Mark	*p_mark;	/* where output left us */
	bool	p_dbx_mode;	/* whether to parse output for file/lineno
				   pairs */
};

private void
	jputenv proto((char *)),
	proc_rec proto((Process, char *, size_t)),
	proc_close proto ((Process)),
	SendData proto((bool)),
	obituary proto((register Process child, wait_status_t w));

private bool
	proc_kill proto((Process, int));

#define child_dead(p)	((p)->p_child_state >= C_EXITED)
#define io_eofed(p)	((p)->p_io_state == IO_EOFED)

private bool
dead(p)
Process	p;
{
	return p == NULL || (io_eofed(p) && child_dead(p));
}


#define proc_cmd(p)	((p)->p_name)

private Process	procs = NULL;

private Process
proc_pid(pid)
pid_t	pid;
{
	register Process	p;

	for (p = procs; ; p = p->p_next)
		if (p == NULL || p->p_portpid == pid)
			return p;
}

private char *
proc_bufname(p)
Process	p;
{
	Buffer	*b = p->p_buffer;

	return (b != NULL) ? b->b_name : "<Deleted>";
}

void
ProcKill()
{
	(void) proc_kill(
		buf_exists(ask_buf(curbuf, ALLOW_OLD | ALLOW_INDEX))->b_process,
		SIGKILL);
}

private void
make_argv(argv, ap)
register char	*argv[];
va_list	ap;
{
	register int	i = 0;

	argv[i++] = va_arg(ap, char *);
	argv[i++] = basename(argv[0]);
	do ; while ((argv[i++] = va_arg(ap, char *)) != NULL);
}

/* There are two very different implementation techniques: pipes and ptys.
 * The following two chunks of code implement the same operations using
 * the two techniques: the first uses pipes and the second uses ptys.
 */

#ifdef PIPEPROCS

#include <sgtty.h>

char	Portsrv[FILESIZE];	/* path to portsrv program (in LibDir) */

int	NumProcs = 0;

File	*ProcInput;
private int	ProcOutput = -1;

pid_t	kbd_pid = -1;

void
read_pipe_proc(pid, nbytes)
pid_t	pid;
register int	nbytes;
{
	register Process	p = proc_pid(pid);

	if (p == NULL) {
		writef("\riproc: unknown pid (%d)", (int)pid);
	} else if (p->p_io_state == IO_NEW) {
		/* first message: pid of real child, not of portsrv */
		pid_t	rpid;

		(void) f_readn(ProcInput, (char *) &rpid, sizeof(pid_t));
		p->p_pid = rpid;
		p->p_io_state = IO_RUNNING;
		UpdModLine = YES;
	} else if (nbytes == -1) {
		/* okay to clean up this process */
		wait_status_t	status;

		(void) f_readn(ProcInput, (char *) &status, sizeof(status));
		/* Reap portsrv process, if it still remains.
		 * Note that any status for this process is uninteresting:
		 * the interesting status came (just now) by pipe.
		 */
		while (p->p_portlive) {
			wait_status_t	w;
			pid_t	rpid = wait(&w);

			if (rpid == -1) {
				if (errno == ECHILD) {
					/* oops: no children, not even portsrv */
					p->p_portlive = NO;
				}
			} else {
				kill_off(rpid, w);
			}
		}
		proc_close(p);
		obituary(p, status);
	} else {
		/* regular data */
		while (nbytes > 0) {
			char	ibuf[512+1];	/* NOTE: room for added NUL */
			size_t n = f_readn(ProcInput, ibuf,
				(size_t)min((int)(sizeof ibuf) - 1, nbytes));

			nbytes -= n;
			proc_rec(p, ibuf, n);
		}
	}
}

void
ProcInt()
{
	(void) proc_kill(curbuf->b_process, SIGINT);
}

void
ProcQuit()
{
	(void) proc_kill(curbuf->b_process, SIGQUIT);
}

private void
proc_close(p)
Process	p;
{
	if (p->p_toproc >= 0) {
		(void) close(p->p_toproc);
		p->p_toproc = -1;	/* writes will fail */
		NumProcs -= 1;
		p->p_io_state = IO_EOFED;	/* process output EOF is tied to reaping */
		UpdModLine = YES;
	}
}

private void
proc_write(p, buf, nbytes)
Process	p;
char	*buf;
size_t	nbytes;
{
	if (p->p_toproc >= 0) {
		while (nbytes != 0) {
			SSIZE_T	wr = write(p->p_toproc, (UnivConstPtr)buf, nbytes);

			if (wr >= 0) {
				nbytes -= wr;
				buf += wr;
			} else if (errno != EINTR) {
				complain("[error writing to iproc: %d %s]", errno, strerror(errno));
			}
		}
	}
}


# ifdef STDARGS
private void
proc_strt(char *bufname, bool clobber, char *procname, ...)
# else
private /*VARARGS3*/ void
proc_strt(bufname, clobber, procname, va_alist)
	char	*bufname;
	bool	clobber;
	char	*procname;
	va_dcl
# endif
{
	Window	*owind = curwind;
	int	toproc[2];
	pid_t	pid;
	Process	newp;
	Buffer	*newbuf;
	char	*argv[32];
	va_list	ap;

	untieDeadProcess(buf_exists(bufname));
	isprocbuf(bufname);	/* make sure BUFNAME is either nonexistant
				   or is of type B_PROCESS */
	if (access(Portsrv, X_OK) < 0) {
		complain("[Couldn't access %s: %s]", Portsrv, strerror(errno));
		/* NOTREACHED */
	}

	dopipe(toproc);

	if (NumProcs++ == 0)
		kbd_strt();	/* may create kbd process: must be done before fork */
	switch (pid = fork()) {
	case -1:
		pipeclose(toproc);
		if (--NumProcs == 0)
			kbd_stop();
		complain("[Fork failed: %s]", strerror(errno));
		/* NOTREACHED */

	case 0:
		argv[0] = "portsrv";
		va_init(ap, procname);
		make_argv(&argv[1], ap);
		va_end(ap);
		(void) dup2(toproc[0], 0);
		(void) dup2(ProcOutput, 1);
		(void) dup2(ProcOutput, 2);
		pipeclose(toproc);
		jcloseall();
		jputenv("EMACS=t");
		jputenv("TERM=emacs");
		/* ??? the following line is not useful for terminfo systems */
		jputenv(sprint("TERMCAP=emacs:co#%d:tc=unknown:", CO-1));
		execv(Portsrv, argv);
		raw_complain("execl failed: %s", strerror(errno));
		_exit(1);
	}

	newp = (Process) emalloc(sizeof *newp);
	newp->p_next = procs;
	newp->p_io_state = IO_NEW;
	newp->p_child_state = C_LIVE;
	newp->p_name = copystr(procname);
	procs = newp;
	newp->p_portpid = pid;
	newp->p_pid = -1;
	newp->p_portlive = YES;

	newbuf = do_select((Window *)NULL, bufname);
	newbuf->b_type = B_PROCESS;
	newp->p_buffer = newbuf;
	newbuf->b_process = newp;	/* sorta circular, eh? */
	pop_wind(bufname, clobber, B_PROCESS);
	ToLast();
	if (!bolp())
		LineInsert(1);
	/* Pop_wind() after everything is set up; important!
	   Bindings won't work right unless newbuf->b_process is already
	   set up BEFORE NEWBUF is first SetBuf()'d. */
	newp->p_mark = MakeMark(curline, curchar);
	newp->p_dbx_mode = NO;

	newp->p_toproc = toproc[1];
	(void) close(toproc[0]);
	SetWind(owind);
}

void
closeiprocs()
{
	Process	p;

	if (ProcOutput != -1)
		close(ProcOutput);
	for (p=procs; p!=NULL; p=p->p_next)
		if (p->p_toproc >= 0)
			close(p->p_toproc);
}

private void
kbd_init()
{
	/* Initiate the keyboard process.
	 * We only get here after a portsrv process has been started
	 * so we know that the portsrv program must exist -- no need to test.
	 */
	int	p[2];

	(void) pipe(p);
	ProcInput = fd_open("process-input", F_READ|F_LOCKED, p[0],
			    (char *)NULL, 512);
	ProcOutput = p[1];
	switch (kbd_pid = fork()) {
	case -1:
		complain("Cannot fork kbd process! %s\n", strerror(errno));
		/* NOTREACHED */

	case 0:
		(void) setsighandler(SIGINT, SIG_IGN);
		(void) setsighandler(SIGALRM, SIG_IGN);
		close(1);
		dup(ProcOutput);
		jcloseall();
		execl(Portsrv, "kbd", (char *)NULL);
		raw_complain("kbd exec failed: %s", strerror(errno));
		exit(-1);
	}
}

/* kbd_stop() returns true if it changes the state of (i.e. stops)
   the keyboard process.  This is so kbd stopping and starting in
   pairs works - see finish() in jove.c. */

private bool	kbd_state = NO;

void
kbd_strt()
{
	if (!kbd_state) {
		if (kbd_pid == -1)
			kbd_init();
		else
			kill(kbd_pid, KBDSIG);
		kbd_state = YES;
	}
}

bool
kbd_stop()
{
	if (kbd_state) {
		kbd_state = NO;
		kill(kbd_pid, KBDSIG);
		return YES;
	}
	return NO;
}

void
kbd_kill()
{
	if (kbd_pid != -1) {
		kill(kbd_pid, SIGKILL);
		kbd_pid = -1;
	}
}

#else /* !PIPEPROCS */

#include <sys/time.h>
#include <fcntl.h>
#include "select.h"

#include "ttystate.h"

# ifdef SVR4_PTYS
#  include <stdlib.h>	/* for grantpt and unlockpt, at least in Solaris 2.3 */
#  include <sys/stropts.h>
  extern char	*ptsname proto((int /*filedes*/));	/* get name of slave */
# endif

# ifdef IRIX_PTYS
#  include <sys/types.h>
#  include <sys/stat.h>
# endif

void
read_pty_proc(fd)
register int	fd;
{
	register Process	p;
	int	n;
	char	ibuf[1024+1];	/* NOTE: room for added NUL */

	for (p = procs; ; p = p->p_next) {
		if (p == NULL) {
			writef("\riproc: unknown fd %d", fd);
			return;
		}
		if (p->p_fd == fd)
			break;
	}

	n = read(fd, (UnivPtr) ibuf, sizeof(ibuf) - 1);
	if (n <= 0) {
		if (n < 0) {
			switch (errno) {
			case EIO:
			case EWOULDBLOCK:
#if EWOULDBLOCK != EAGAIN
			case EAGAIN:
#endif
				/* ??? On some systems, pty reads fail initially, for
				 * reasons that are not clear to me (DHR).  This code
				 * forgives these specific kinds of failure until the
				 * process leaves the NEW state.  We hope that this
				 * does not cause a long busy wait.
				 */
				if (p->p_io_state == IO_NEW)
					return;

				/* We get here if the i-proc closes stdout
				 * before exiting (eg. Bourne Shell),
				 * so we treat it as a simple EOF.
				 */
				break;
			default:
				/* true I/O error */
				swritef(ibuf, sizeof(ibuf),
					"\n[pty read error: %s]\n", strerror(errno));
				proc_rec(p, ibuf, strlen(ibuf));
				/* now treat as EOF... */
			}
		} /* else, EOF received */
		proc_close(p);
	} else {
		if (p->p_io_state == IO_NEW) {
			p->p_io_state = IO_RUNNING;
			UpdModLine = YES;
		}
		proc_rec(p, ibuf, (size_t)n);
	}
}

void
ProcCont()
{
	Process	p = curbuf->b_process;

	if (proc_kill(p, SIGCONT) && p->p_child_state == C_STOPPED) {
		p->p_child_state = C_LIVE;
		UpdModLine = YES;
	}
}

/* Sending non-character info through "keyboard"
 *
 * There are two kinds of "out of band" signals we wish to send
 * through the pty: signals (such as SIGINT) and EOF.  On top
 * of that, there is a kind of out of band signal we wish not to
 * send: ERASE and KILL.  Unfortunately, there are a number of ways
 * in which our environment may vary.  Two ioctls are useful:
 * TIOCREMOTE and TIOCSIGNAL/TIOCSIG.
 *
 *
 * TIOCREMOTE:
 *
 * Some systems support the TIOCREMOTE ioctl.  With this ioctl,
 * the "input editing" is suppressed on the characters sent
 * to the slave.  Input editing involves interpreting ERASE,
 * KILL, INTERRUPT, QUIT, EOF, etc. characters.  It is best
 * to run this way since JOVE already does input editing.
 *
 * The scant documentation on TIOCREMOTE in Solaris2.3 suggests
 * that the third argument to the TIOCREMOTE ioctl ought to be
 * an integer (but a pointer to the integer works).  The SunOS4
 * ldterm(4m) manpage says that the third argument is to be a
 * pointer to an integer.  At the moment, we only use the pointer
 * form.
 *
 * Although IRIX defines TIOCREMOTE, it does not seem to work.
 * This may well be true of other systems, so as a safety,
 * we support "NO_TIOCREMOTE" as a feature deselect macro
 * for systems that define TIOCREMOTE but are broken.
 *
 * Under BSDI's BSD/386 v1.[01], the TIOCREMOTE ioctls appear to fail
 * for send_xc (without an error indication), but work otherwise.  This
 * only affects dstop-process, so it is probably best not to define
 * NO_TIOCREMOTE.  Even if we do define NO_TIOCREMOTE, the dstop-process
 * may require the user to do a process-newline (apparently, if the tty
 * input is being canonicalized).  How odd.
 *
 *
 * TIOCSIGNAL/TIOCSIG:
 *
 * Some systems support the TIOCSIGNAL ioctl.  With this ioctl,
 * a signal can be sent through the pty.  Recent (4.3 or later?)
 * BSD systems seem to provide a TIOCSIG ioctl which is similar.
 *
 * The TIOCSIGNAL ioctl is not well documented and seems to be
 * broken on at least IRIX 5.3.  Again, we provide "NO_TIOCSIGNAL"
 * to prevent using it on systems that define it but are broken.
 *
 * Another mystery: systems vary on how the signal number should be
 * passed in the TIOCSIGNAL ioctl.  SunOS4 requires that the third
 * argument be a pointer to an integer, the signal number.  Vanilla
 * SVR4 requires that the third argument be a an integer, the signal
 * number.  Solaris2.3 accepts either.  The SunOS 5.3 STREAMS
 * Programmer's Guide says that the third argument is an int.  We have
 * not figured out, for an arbitrary system with TIOCSIGNAL, how to
 * tell which form the third argument should take.  For now, it is
 * conditionalized on SVR4_PTYS.
 *
 * If TIOCSIGNAL/TIOCSIG isn't supplied (perhaps from termios.h), we
 * cannot send signals to the child when TIOCREMOTE is on, so we just
 * turn it off for a moment.  This is pretty dubious because the user
 * might have done an stty to change or disable the characters.
 *
 * We don't know how to implement dstop using TIOCSIGNAL/TIOCSIG, so
 * we use the dubious trick.
 */

# if !defined(NO_TIOCREMOTE) && !defined(TIOCREMOTE)
#  define NO_TIOCREMOTE	1
# endif

# if !defined(NO_TIOCSIGNAL) && !defined(TIOCSIGNAL) && !defined(TIOCSIG)
#  define NO_TIOCSIGNAL	1
# endif

# ifdef NO_TIOCSIGNAL

#  define kbd_sig(sig, tch, sch)	send_oxc(tch, sch)

# else /* !NO_TIOCSIGNAL */

#  define kbd_sig(sig, tch, sch)	send_sig(sig)

private void
send_sig(sig)
int	sig;
{
	Process	p;

	if ((p = curbuf->b_process) == NULL || p->p_fd < 0)
		complain("[No process]");
	ToLast();
#  ifdef TIOCSIG
	if (ioctl(p->p_fd, TIOCSIG, sig) < 0)
		complain("TIOCSIG failed: %d %s", errno, strerror(errno));
#  else /* !TIOCSIG */
#   ifdef SVR4_PTYS
	if (ioctl(p->p_fd, TIOCSIGNAL, sig) < 0)
		complain("TIOCSIGNAL failed: %d %s", errno, strerror(errno));
#   else /* !SVR4_PTYS */
	if (ioctl(p->p_fd, TIOCSIGNAL, (void *) &sig) < 0)
		complain("TIOCSIGNAL failed: %d %s", errno, strerror(errno));
#   endif /* !SVR4_PTYS */
#  endif /* !TIOCSIG */
}

# endif /* !NO_TIOCSIGNAL */

# if defined(NO_TIOCREMOTE) || defined(NO_TIOCSIGNAL) || (!defined(TERMIO) && !defined(TERMIOS)) || defined(VDSUSP)

#  if defined(TERMIO) || defined(TERMIOS)
#   define send_oxc(tch, sch)	send_xc(sg[NO].c_cc[tch])
#  else
#   define send_oxc(tch, sfld)	send_xc(tc[NO].sfld)
#  endif

private void
send_xc(c)
char	c;
{
	Process	p;

	if ((p = curbuf->b_process) == NULL || p->p_fd < 0)
		complain("[No process]");
	ToLast();
	{
		char	buf[1+1];	/* NOTE: room for added NUL */

		buf[0] = c;
		proc_rec(p, buf, (size_t)1);

		{
#  ifndef NO_TIOCREMOTE
			int
				off = 0,
				on = 1;

			while (ioctl(p->p_fd, TIOCREMOTE, (UnivPtr) &off) < 0)
				if (errno != EINTR)
					complain("TIOCREMOTE OFF failed: %d %s", errno, strerror(errno));
#  endif /* !NO_TIOCREMOTE */
			for (;;) {
				switch (write(p->p_fd, (UnivPtr) &c, sizeof(c))) {
				case -1: /* error: consider ERRNO */
					if (errno == EINTR)
						continue;	/* interrupted: try again */
					complain("pty write of control failed: %d %s", errno, strerror(errno));
					/* NOTREACHED */
				case 0: /* nothing happened: try again */
					continue;
				case 1: /* done */
					break;
				}
				break;
			}
#  ifndef NO_TIOCREMOTE
			while (ioctl(p->p_fd, TIOCREMOTE, (UnivPtr) &on) < 0)
				if (errno != EINTR)
					complain("TIOCREMOTE ON failed: %d %s", errno, strerror(errno));
#  endif /* !NO_TIOCREMOTE */
		}
	}
}

# endif /* defined(NO_TIOCREMOTE) || defined(NO_TIOCSIGNAL) */

void
ProcEof()
{
# ifdef NO_TIOCREMOTE
	/* we have to write a char */
	send_oxc(VEOF, t_eofc);
# else /* !NO_TIOCREMOTE */
	/* write a zero-length record to signify EOF */
	static char mess[] = "<EOF> ";	/* NOTE: NUL will be overwritten */
	Process	p;

	if ((p = curbuf->b_process) == NULL || p->p_fd < 0)
		complain("[No process]");
	ToLast();
	proc_rec(p, mess, sizeof(mess)-1);
	while (write(p->p_fd, (UnivPtr) mess, (size_t)0) < 0)
		if (errno != EINTR)
			complain("[error writing EOF to iproc: %d %s]", errno, strerror(errno));
# endif /* !NO_TIOCREMOTE */
}

void
ProcInt()
{
	kbd_sig(SIGINT, VINTR, t_intrc);
}

void
ProcQuit()
{
	kbd_sig(SIGQUIT, VQUIT, t_quitc);
}

void
ProcStop()
{
# if (!defined(TERMIO) && !defined(TERMIOS)) || defined(VSUSP)
	kbd_sig(SIGTSTP, VSUSP, t_suspc);
# else
	complain("[stop-process not supported]");
# endif
}

void
ProcDStop()
{
	/* we don't know how to send a dstop via TIOCSIGNAL/TIOCSIG */
# if (!defined(TERMIO) && !defined(TERMIOS)) || defined(VDSUSP)
	send_oxc(VDSUSP, t_dsuspc);
# else
	complain("[dstop-process not supported]");
# endif
}

private void
proc_close(p)
Process p;
{
	if (p->p_fd >= 0) {
		(void) close(p->p_fd);
		FD_CLR(p->p_fd, &global_fd);
		p->p_fd = -1;
		p->p_io_state = IO_EOFED;	/* I/O is finished */
		UpdModLine = YES;
	}
}

private void
proc_write(p, buf, nbytes)
Process p;
char	*buf;
size_t	nbytes;
{
	if (p->p_fd >= 0) {
		fd_set	mask;

		FD_ZERO(&mask);
		FD_SET(p->p_fd, &mask);
		while (write(p->p_fd, (UnivPtr) buf, nbytes) <  0)
			(void) select(p->p_fd + 1, (fd_set *)NULL, &mask, (fd_set *)NULL,
				(struct timeval *)NULL);
	}
}

# ifdef STDARGS
private void
proc_strt(char *bufname, bool clobber, char *procname, ...)
# else
private /*VARARGS2*/ void
proc_strt(bufname, clobber, procname, va_alist)
	char	*bufname;
	bool	clobber;
	char	*procname;
	va_dcl
# endif
{
	va_list	ap;
	char	*argv[32];
	Window *owind = curwind;
	pid_t	pid;
	Process	newp;
	Buffer	*newbuf;
	int	i,
		ptyfd = -1;

# if !defined(TERMIO) && !defined(TERMIOS)
#  ifdef TIOCSETD
	int	ldisc;	/* tty line discipline */
#  endif
#  ifdef TIOCLSET
	int	lmode;	/* tty local flags */
#  endif
# endif
	register char	*s,
			*t;
	char	ttybuf[32];
# ifdef TERMIO
	struct termio sgt;
# endif
# ifdef TERMIOS
	struct termios sgt;
# endif
# ifdef SGTTY
	struct sgttyb sgt;
# endif

# ifdef TIOCGWINSZ
	struct winsize win;
# else
#  ifdef BTL_BLIT
#  include <sys/jioctl.h>
	struct jwinsize jwin;
#  endif
# endif

	untieDeadProcess(buf_exists(bufname));
	isprocbuf(bufname);	/* make sure BUFNAME is either nonexistant
				   or is of type B_PROCESS */
	va_init(ap, procname);
	make_argv(argv, ap);
	va_end(ap);
	if (access(argv[0], X_OK) != 0) {
		complain("[Couldn't access %s: %s]", argv[0], strerror(errno));
		/* NOTREACHED */
	}

# ifdef IRIX_PTYS
	/*
	 * _getpty may fork off a child to execute mkpts to make a slave pty
	 * in /dev (if we need more) and set the correct ownership and
	 * modes on the slave pty.  Since _getpty uses waitpid this works
	 * fine with regard to our other children, but we do have to be
	 * prepared to catch a SIGCHLD for an unknown child and ignore it ...
	 */
	s = _getpty(&ptyfd, O_RDWR|O_NDELAY, 0600, 0);
	if (s == NULL) {
		message("[No ptys!]");
		goto fail;
	}
	(void)strcpy(ttybuf, s);
# endif /* IRIX_PTYS */
# ifdef SVR4_PTYS
	if ((ptyfd = open("/dev/ptmx", O_RDWR)) < 0) {
		message("[No ptys!]");
		goto fail;
	}
#  ifndef GRANTPT_BUG
	/* grantpt() seems to be implemented using a fork/exec.
	 * This is done to allow grantpt do do priviledged things
	 * via a setuid program.  One consequence is that JOVE's
	 * SIGCLD/SIGCHLD handler must not do a wait that would
	 * reap the grantpt process.  So much for library routines
	 * being black boxes.  Worse, this restriction is not documented.
	 */
	if (grantpt(ptyfd) < 0) {
		message("[grantpt failed]");
		goto fail;
	}
	if (unlockpt(ptyfd) < 0) {
		message("[unlockpt failed]");
		goto fail;
	}
#  endif /* !GRANTPT_BUG */
	if ((s = ptsname(ptyfd)) == NULL) {
		message("[ptsname failed]");
		goto fail;
	}
	strcpy(ttybuf, s);
	(void) ioctl(ptyfd, TIOCFLUSH, (UnivPtr) NULL);	/* ??? why? */
# endif /* SVR4_PTYS */
# ifdef BSD_PTYS
	for (s = "pqrs"; ptyfd<0; s++) {
		if (*s == '\0') {
			message("[Out of ptys!]");
			goto fail;
		}
		for (t = "0123456789abcdef"; *t; t++) {
			swritef(ttybuf, sizeof(ttybuf), "/dev/pty%c%c", *s, *t);
			if ((ptyfd = open(ttybuf, 2)) >= 0) {
				ttybuf[5] = 't';	/* pty => tty */
#  ifdef NEVER
				/* Make sure both ends are available.
				 * ??? This code seems to confuse BSDI's BSD/386 v1.[01]
				 * so we have eliminated it.  We leave this scar
				 * in case the checking was in fact useful on other
				 * systems.  Part of this checking will still be
				 * done by the "access" below, but with no recovery.
				 */
				if ((i = open(ttybuf, 2)) < 0) {
					(void) close(ptyfd);
					ptyfd = -1;
				} else {
					(void) close(i);
					break;
				}
#  else
				break;
#  endif
			}
		}
	}
# endif /* BSD_PTYS */
	/* Check that we can write to the pty, else things will fail in the
	 * child, where they're harder to detect.  This will not work with
	 * GRANTPT_BUG because the grantpt and unlockpt have not been done yet.
	 */
# ifndef GRANTPT_BUG
	if (access(ttybuf, W_OK) != 0) {
		int	ugh = errno;

		message("[Couldn't access ");
		message(ttybuf);
		message(": ");
		message(strerror(ugh));
		message("]");
		goto fail;
	}
# endif /* !GRANTPT_BUG */

# if !defined(TERMIO) && !defined(TERMIOS)
#  ifdef TIOCGETD
	(void) ioctl(0, TIOCGETD, (UnivPtr) &ldisc);
#  endif
#  ifdef TIOCLGET
	(void) ioctl(0, TIOCLGET, (UnivPtr) &lmode);
#  endif
# endif /* !defined(TERMIO) && !defined(TERMIOS) */

# ifdef TIOCGWINSZ
	(void) ioctl(0, TIOCGWINSZ, (UnivPtr) &win);
# else
#  ifdef BTL_BLIT
	(void) ioctl(0, JWINSIZE, (UnivPtr) &jwin);
#  endif /* BTL_BLIT */
# endif

	switch (pid = fork()) {
	case -1:
		/* fork failed */

		{
		int	ugh = errno;	/* hold across library calls */

		message("[Fork failed! ");
		message(strerror(ugh));
		message("]");
		goto fail;
		}

	case 0:
		/* child process */

# ifdef GRANTPT_BUG
		/* grantpt() seems to be implemented using a fork/exec.
		 * This is done to allow grantpt do do priviledged things
		 * via a setuid program.  One consequence is that JOVE's
		 * SIGCLD/SIGCHLD handler must not do a wait that would
		 * reap the grantpt process.  So much for library routines
		 * being black boxes.  Worse, this restriction is not documented.
		 *
		 * Worse still, at least Solaris 2.0 and SVR4.0 appear to have
		 * a bug: the wait is not restarted once interrupted.  If the wait
		 * is interrupted, (1) the grantpt will return a failure status
		 * and (2) the process will not be reaped -- it will remain a
		 * zombie until JOVE exits or happens to reap it accidentally.
		 * Any interrupt could cause the premature end of the wait,
		 * but SIGCHLD (actually, SIGCLD) is the most probable.
		 *
		 * To dodge these bullets, we moved the grantpt into the child
		 * where we can turn off signal handling.  Too bad this prevents
		 * us giving good diagnostics for grantpt and unlockpt.
		 * I hope I've found all the signals caught everywhere else.
		 */
		(void) setsighandler(SIGCHLD, SIG_DFL);
		(void) setsighandler(SIGWINCH, SIG_DFL);
		(void) setsighandler(SIGALRM, SIG_DFL);
		(void) setsighandler(SIGINT, SIG_DFL);
		/* (void) setsighandler(SIGQUIT, SIG_DFL); */	/* dead anyway */
		/* (void) setsighandler(SIGHUP, SIG_DFL); */	/* dead anyway */
		/* (void) setsighandler(SIGTERM, SIG_DFL); */	/* no longer used */
		/* (void) setsighandler(SIGBUS, SIG_DFL); */	/* dead anyway */
		/* (void) setsighandler(SIGSEGV, SIG_DFL); */	/* dead anyway */
		/* (void) setsighandler(SIGPIPE, SIG_DFL); */	/* dead anyway */

		if (grantpt(ptyfd) < 0) {
			_exit(errno + 1);
		}

		if (unlockpt(ptyfd) < 0) {
			_exit(errno + 1);
		}
# endif /* GRANTPT_BUG */
		jcloseall();
		(void) close(0);
		(void) close(1);
		(void) close(2);

# ifdef TERMIOS
		setsid();
# else /* !TERMIOS */
#  ifdef TIOCNOTTY
		/* get rid of controlling tty */
		if ((i = open("/dev/tty", 2)) >= 0) {
			(void) ioctl(i, TIOCNOTTY, (UnivPtr)NULL);
			(void) close(i);
		}
#  endif /* TIOCNOTTY */
# endif /* !TERMIOS */
		if (open(ttybuf, 2) != 0)
			_exit(errno+1);
		(void) dup2(0, 1);
		(void) dup2(0, 2);

# ifdef SVR4_PTYS
		(void) ioctl(0, I_PUSH, (UnivPtr) "ptem");
		(void) ioctl(0, I_PUSH, (UnivPtr) "ldterm");
		(void) ioctl(0, I_PUSH, (UnivPtr) "ttcompat");
# endif

# ifdef TIOCSCTTY
		/* This is needed by OSF.  It may be needed by BSDPOSIX systems.
		 * It should not hurt any system that define TIOCSCTTY.
		 */
		(void) ioctl(0, TIOCSCTTY); /* make this controling tty */
# endif

# ifndef NO_TIOCREMOTE
		/* The TIOCREMOTE ioctl prevents the pty code from doing
		 * input editing on characters from the master.  In particular
		 * we don't want ERASE, KILL, INTERRUPT,  QUIT, etc. characters
		 * interpreted.
		 * On SVR4, this must be done *after* the slave side is set up.
		 * The easiest way to ensure this is to put it here, in the child
		 * after the slave is opened and has the STREAMS modules pushed,
		 * and before the master is closed.
		 */
		{
			int	on = 1;

			if (ioctl(ptyfd, TIOCREMOTE, (UnivPtr) &on) < 0)
				_exit(errno+1);	/* no good way to signal user */
		}
# endif
		close(ptyfd);

# if !defined(TERMIO) && !defined(TERMIOS)
#  ifdef TIOCSETD
		(void) ioctl(0, TIOCSETD, (UnivPtr) &ldisc);
#  endif
#  ifdef TIOCLSET
		(void) ioctl(0, TIOCLSET, (UnivPtr) &lmode);
#  endif
#  ifdef TIOCSETC
		(void) ioctl(0, TIOCSETC, (UnivPtr) &tc[NO]);
#  endif
#  ifdef USE_TIOCSLTC
		(void) ioctl(0, TIOCSLTC, (UnivPtr) &ls[NO]);
#  endif
# endif /* !defined(TERMIO) && !defined(TERMIOS) */

# ifdef TIOCGWINSZ
		win.ws_row = curwind->w_height;
		(void) ioctl(0, TIOCSWINSZ, (UnivPtr) &win);
# else /* !TIOCGWINSZ */
#  ifdef BTL_BLIT
		jwin.bytesy = curwind->w_height;
		(void) ioctl(0, JSWINSIZE, (UnivPtr) &jwin);
#  endif
# endif /* !TIOCGWINSZ */

# if defined(TERMIO) || defined(TERMIOS)
		sgt = sg[NO];
		sgt.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | ICRNL
#  ifdef IXANY	/* not in QNX */
			| IXANY
#  endif
			| IXON | IXOFF);
		sgt.c_lflag &= ~(ECHO);
		sgt.c_oflag &= ~(ONLCR | TABDLY);
#  ifdef TERMIO
		do ; while (ioctl(0, TCSETAW, (UnivPtr) &sgt) < 0 && errno == EINTR);
#  endif
#  ifdef TERMIOS
		do ; while (tcsetattr(0, TCSADRAIN, &sgt) < 0 && errno == EINTR);
#  endif
# else /* !(defined(TERMIO) || defined(TERMIOS)) */
		sgt = sg[NO];
		sgt.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE | CBREAK | TANDEM);
		(void) stty(0, &sgt);
# endif /* !(defined(TERMIO) || defined(TERMIOS)) */

		NEWPG();
# ifdef POSIX_PROCS
		tcsetpgrp(0, getpid());
# else /* !POSIX_PROCS */
		i = getpid();
		(void) ioctl(0, TIOCSPGRP, (UnivPtr) &i);
# endif /* POSIX_PROCS */

		jputenv("EMACS=t");
		jputenv("TERM=emacs");
		/* ??? the following line is not useful for terminfo systems */
		jputenv(sprint("TERMCAP=emacs:co#%d:tc=unknown:", CO-1));
		execvp(argv[0], &argv[1]);
		raw_complain("execvp failed! %s", strerror(errno));
		_exit(errno + 1);
	}

	newp = (Process) emalloc(sizeof *newp);

# ifdef O_NDELAY
	fcntl(ptyfd, F_SETFL, O_NDELAY);
# endif
# ifdef O_NONBLOCK
	fcntl(ptyfd, F_SETFL, O_NONBLOCK);
# endif
	newp->p_fd = ptyfd;
	newp->p_pid = pid;

	newbuf = do_select((Window *)NULL, bufname);
	newbuf->b_type = B_PROCESS;
	newp->p_buffer = newbuf;
	newbuf->b_process = newp;	/* sorta circular, eh? */
	pop_wind(bufname, clobber, B_PROCESS);
	/* Pop_wind() after everything is set up; important!
	   Bindings won't work right unless newbuf->b_process is already
	   set up BEFORE NEWBUF is first SetBuf()'d. */
	ToLast();
	if (!bolp())
		LineInsert(1);

	newp->p_name = copystr(procname);
	newp->p_io_state = IO_NEW;
	newp->p_child_state = C_LIVE;
	newp->p_mark = MakeMark(curline, curchar);
	newp->p_dbx_mode = NO;

	newp->p_next = procs;
	procs = newp;
	FD_SET(newp->p_fd, &global_fd);
	if (global_maxfd <= newp->p_fd)
		global_maxfd = newp->p_fd + 1;
	SetWind(owind);
	return;

fail:
	if (ptyfd >= 0)
		close(ptyfd);
}

/* NOTE 1: SIGCHLD is an asynchronous signal.  To safely handle it,
 * the sigchld_handler simply sets a flag requesting later processing.
 * reap_procs is called synchronously to do the actual work.
 *
 * NOTE 2: SIGCHLD is "level triggered" on some systems (HPUX, IRIX, ...).
 * If the signal signal handler is re-established before the child is reaped,
 * another signal will be generated immediately.  For this reason, we
 * defer the re-establishment until reap_procs is done.
 */

volatile bool	procs_to_reap = NO;

/*ARGSUSED*/
SIGRESTYPE
sigchld_handler(junk)
int	junk;	/* needed for signal handler; not used */
{
	procs_to_reap = YES;
	return SIGRESVALUE;
}

void
reap_procs()
{
	wait_status_t	w;
	register pid_t	pid;

	for (;;) {
		pid = wait_opt(&w, (WNOHANG | WUNTRACED));
		if (pid <= 0) {
			if (procs_to_reap) {
				resetsighandler(SIGCHLD, sigchld_handler);
				procs_to_reap = NO;
				/* go around once more to avoid window of vulnerability */
			} else {
				break;
			}
		} else {
			kill_off(pid, w);
		}
	}
}

void
closeiprocs()
{
	Process	p;

	for (p=procs; p!=NULL; p=p->p_next)
		if (p->p_fd >= 0)
			close(p->p_fd);
}

#endif /* !PIPEPROCS */

extern char **environ;

private void
jputenv(def)
char *def;	/* Note: caller must ensure string persists */
{
	char	**p, *eq;
	static int	headroom = -1;	/* trick: -1 is flag for first time */

	if ((eq = strchr(def, '=')) == NULL)
		return;

	for (p = environ; ; p++) {
		if (*p == NULL) {
			if (headroom <= 0) {
#				define JENV_INCR	5
				size_t	sz = ((p-environ) + 1) * sizeof(char *);
				char	**ne = (char **)malloc(sz + JENV_INCR*sizeof(char *));

				if (ne == NULL)
					break;
				byte_copy(environ, ne, sz);
				p = ne + (p-environ);
				if (headroom == 0)
					free((UnivPtr)environ);
				headroom = JENV_INCR;
				environ = ne;
#				undef JENV_INCR
			}
			headroom -= 1;
			*p++ = def;
			*p = NULL;
			break;
		}
		if (strncmp(*p, def, (size_t) (eq - def + 1)) == 0) {
			*p = def;
			break;
		}
	}
}

char	proc_prompt[128] = "% ";	/* VAR: process prompt */

const char *
dbxness(p)
Process p;
{
	return (p == NULL || !p->p_dbx_mode)? NullStr : "DBX ";
}

const char *
pstate(p)
Process	p;
{
	static const char	*const ios_name[] = { "New", "Running", "EOFed" };

	if (p == NULL)
		return "No process";

	/* Try *not* to report the whole cross-product of child and IO states. */
	switch (p->p_child_state) {
	case C_LIVE:
		return ios_name[p->p_io_state];
	case C_STOPPED:
		return io_eofed(p)? "Stopped; EOFed" : "Stopped";
	case C_EXITED:
		if (io_eofed(p) && p->p_reason == 0)
			return "Done";
		/* FALLTHROUGH */
	default:
		return sprint("%s %d%s",
			(p->p_child_state == C_EXITED? "Exited" : "Killed"),
			p->p_reason,
			(io_eofed(p)? "" : "; not EOFed"));
	}
}

bool
KillProcs()
{
	register Process	p;
	bool	asked = NO;

	for (p = procs; p != NULL; p = p->p_next) {
		if (!dead(p)) {
			if (!asked) {
				if (!yes_or_no_p("Some interactive processes are still running; leave anyway? "))
					return NO;	/* processes not killed */
				asked = YES;
			}
			if (!child_dead(p))
				(void) proc_kill(p, SIGKILL);
			proc_close(p);
		}
	}
	return YES;	/* processes killed */
}

/* VAR: dbx-mode parse string */
char	dbx_parse_fmt[128] = "line \\([0-9]*\\) in \\{file\\|\\} *\"\\([^\"]*\\)\"";

void
DBXpoutput()
{
	if (curbuf->b_process == NULL)
		complain("[Must be in a process buffer to enable dbx mode]");
	curbuf->b_process->p_dbx_mode = !curbuf->b_process->p_dbx_mode;
	UpdModLine = YES;
}

private void
watch_input(m)
Mark	*m;
{
	Bufpos	save;
	char	fname[FILESIZE],
		lineno[FILESIZE];
	int	lnum;
	Window	*savew = curwind;
	Buffer	*buf;

	DOTsave(&save);
	ToMark(m);
	if (dosearch(dbx_parse_fmt, FORWARD, YES) != NULL) {
		get_FL_info(fname, lineno);
		buf = do_find((Window *)NULL, fname, YES, YES);
		pop_wind(buf->b_name, NO, -1);
		lnum = atoi(lineno);
		SetLine(next_line(buf->b_first, lnum - 1));
		SetWind(savew);
	}
	SetDot(&save);
}

/* Process receive: receives the characters in buf, and appends them to
   the buffer associated with p. */

private void
proc_rec(p, buf, len)
register Process	p;
char	*buf;
size_t	len;
{
	Buffer	*saveb = curbuf;
	register Window	*w;
	register Mark	*savepoint;
	bool	sameplace,
		do_disp;

	if (curwind->w_bufp == p->p_buffer)
		w = curwind;
	else
		w = windbp(p->p_buffer);	/* Is this window visible? */
	do_disp = w != NULL && in_window(w, p->p_mark->m_line) != -1;
	SetBuf(p->p_buffer);
	savepoint = MakeMark(curline, curchar);
	ToMark(p->p_mark);		/* where output last stopped */
	sameplace = savepoint->m_line == curline && savepoint->m_char == curchar;

	/* insert contents of buffer, carefully translating NUL to ^@ */
	buf[len] = '\0';	/* NUL-terminate buffer */
	while (len != 0) {
		if (*buf == '\0') {
			ins_str_wrap("^@", YES, WrapProcessLines ? CO-1 : LBSIZE-1);
			buf++;
			len--;
		} else {
			size_t	sublen = strlen(buf);

			ins_str_wrap(buf, YES, WrapProcessLines ? CO-1 : LBSIZE-1);
			buf += sublen;
			len -= sublen;
		}
	}

	if (do_disp && p->p_dbx_mode)
		watch_input(p->p_mark);
	MarkSet(p->p_mark, curline, curchar);
	if (!sameplace)
		ToMark(savepoint);	/* back to where we were */
	DelMark(savepoint);
	/* redisplay now, instead of right after the ins_str, so that
	   we don't get a bouncing effect if point is not the same as
	   the process output position */
	if (do_disp) {
		w->w_line = curline;
		w->w_char = curchar;
		redisplay();
	}
	SetBuf(saveb);
}

private bool
proc_kill(p, sig)
register Process	p;
int	sig;
{
	if (p == NULL)
		complain("[no process]");
	if (!child_dead(p)) {
		if (killpg(p->p_pid, sig) != -1)
			return YES;
		s_mess("Cannot kill %s!", proc_bufname(p));
	}
	return NO;
}

/* Free process CHILD.  Do all the necessary cleaning up (closing fd's,
   etc.). */

private void
free_proc(child)
Process	child;
{
	register Process
		p,
		prev = NULL;

	if (!dead(child))
		return;
	untieDeadProcess(child->p_buffer);

	for (p = procs; p != child; prev = p, p = p->p_next)
		;

	if (prev == NULL)
		procs = child->p_next;
	else
		prev->p_next = child->p_next;
	proc_close(child);		/* if not already closed */

	free((UnivPtr) child->p_name);
	free((UnivPtr) child);
}

void
untieDeadProcess(b)
register Buffer	*b;
{
	if (b != NULL) {
		register Process	p = b->b_process;

		if (p != NULL) {
			Buffer	*old = curbuf;

			if (!dead(p))
				complain("Process %s, attached to %b, is %s.",
					 proc_cmd(p), b, pstate(p));
			SetBuf(p->p_buffer);
			DelMark(p->p_mark);
			SetBuf(old);
			p->p_buffer = NULL;
			b->b_process = NULL;
		}
	}
}

void
ProcList()
{
	register Process
		p,
		next;
	char	*fmt = "%-15s  %-15s  %-8s %s",
		pidstr[16];

	if (procs == NULL) {
		message("[No subprocesses]");
		return;
	}
	TOstart("Process list");

	Typeout(fmt, "Buffer", "Status", "Pid ", "Command");
	Typeout(fmt, "------", "------", "--- ", "-------");
	for (p = procs; p != NULL; p = next) {
		next = p->p_next;
		swritef(pidstr, sizeof(pidstr), "%d", (int) p->p_pid);
		Typeout(fmt, proc_bufname(p), pstate(p), pidstr, p->p_name);
		if (dead(p)) {
			free_proc(p);
			UpdModLine = YES;
		}
	}
	TOstop();
}

private void
do_rtp(mp)
register Mark	*mp;
{
	register Process	p = curbuf->b_process;
	LinePtr	line1 = curline,
		line2 = mp->m_line;
	int	char1 = curchar,
		char2 = mp->m_char;
	char	*gp;
	size_t	nbytes;

	if (dead(p) || p->p_buffer != curbuf)
		return;

	(void) fixorder(&line1, &char1, &line2, &char2);
	while (line1 != line2->l_next) {
		gp = ltobuf(line1, genbuf) + char1;
		if (line1 == line2) {
			nbytes = char2 - char1;
		} else {
			genbuf[Jr_Len] = EOL;	/* replace NUL with EOL */
			nbytes = Jr_Len - char1 + 1;	/* and include it */
		}
		if (nbytes != 0)
			proc_write(p, gp, nbytes);
		line1 = line1->l_next;
		char1 = 0;
	}
}

void
ProcNewline()
{
#ifdef ABBREV
	MaybeAbbrevExpand();
#endif
	SendData(YES);
}

void
ProcSendData()
{
#ifdef ABBREV
	MaybeAbbrevExpand();
#endif
	SendData(NO);
}

private void
SendData(newlinep)
bool	newlinep;
{
	register Process	p = curbuf->b_process;
	register char	*lp,
			*gp;	/* JF fix for better prompt handling */

	if (dead(p))
		return;
	/* If the process mark was involved in a big deletion, because
	   the user hit ^W or something, then let's do some magic with
	   the process mark.  Problem is that if the user yanks back the
	   text he deleted, the mark stays at the beginning of the region,
	   and so the next time SendData() is called the entire region
	   will be sent.  That's not good.  So, to deal with that we reset
	   the mark to the last line, after skipping over the prompt, etc. */
	if (p->p_mark->m_big_delete) {
		Bufpos	bp;

		p->p_mark->m_big_delete = NO;

		DOTsave(&bp);
		ToLast();
		Bol();
		/* While we're looking at a prompt, and while we're
		   moving forward.  This is for people who accidently
		   set their process-prompt to ">*" which will always
		   match! */
		while (LookingAt(proc_prompt, linebuf, curchar)
		&& (REeom > curchar))
			curchar = REeom;
		MarkSet(p->p_mark, curline, curchar);
		SetDot(&bp);
	}

	if (lastp(curline)) {
		Eol();
		if (newlinep)
			LineInsert(1);
		do_rtp(p->p_mark);
		MarkSet(p->p_mark, curline, curchar);
	} else {
		/* Either we're looking at a prompt, or we're not, in
		   which case we want to strip off the beginning of the
		   line anything that looks like what the prompt at the
		   end of the file is.  In other words, if "(dbx) stop in
		   ProcessNewline" is the line we're on, and the last
		   line in the buffer is "(dbx) ", then we strip off the
		   leading "(dbx) " from this line, because we know it's
		   part of the prompt.  But this only happens if "(dbx) "
		   isn't one of the process prompts ... follow what I'm
		   saying? */
		Bol();
		if (LookingAt(proc_prompt, linebuf, curchar)) {
			do {
				curchar = REeom;
			} while (LookingAt(proc_prompt, linebuf, curchar)
			&& (REeom > curchar));
			strcpy(genbuf, linebuf + curchar);
			Eof();
			ins_str(genbuf);
		} else {
			strcpy(genbuf, linebuf + curchar);
			Eof();
			gp = genbuf;
			lp = linebuf;
			while (*lp == *gp && *lp != '\0') {
				lp += 1;
				gp += 1;
			}
			ins_str(gp);
		}
	}
}

void
ShellProc()
{
	char	shbuf[20];
	register Buffer	*b;

	swritef(shbuf, sizeof(shbuf), "*shell-%d*", arg_value());
	b = buf_exists(shbuf);
	if (b == NULL || dead(b->b_process))
		proc_strt(shbuf, NO, "i-shell", Shell, "-is", pr_name(curbuf->b_fname, NO),
			(char *)NULL);
	pop_wind(shbuf, NO, -1);
}

void
Iprocess()
{
	char	scratch[64],
		*bnm;
	int	cnt = 1;
	Buffer	*bp;
	char	*fn = pr_name(curbuf->b_fname, NO);

	null_ncpy(ShcomBuf, ask(ShcomBuf, ProcFmt), (sizeof ShcomBuf) - 1);
	bnm = MakeName(ShcomBuf);
	null_ncpy(scratch, bnm, (sizeof scratch) - 1);
	while ((bp = buf_exists(scratch)) != NULL && !dead(bp->b_process))
		swritef(scratch, sizeof(scratch), "%s.%d", bnm, cnt++);
	proc_strt(scratch, YES, ShcomBuf, Shell, ShFlags, ShcomBuf, fn, fn, (char *)NULL);
}

pid_t	DeadPid;	/* info about ChildPid, if reaped by kill_off */
wait_status_t	DeadStatus;

#ifdef USE_PROTOTYPES
void
kill_off(pid_t pid, wait_status_t w)
#else
void
kill_off(pid, w)
register pid_t	pid;
wait_status_t	w;
#endif
{
	register Process	child;

	if (pid == ChildPid) {
		/* we are reaping the non-iproc process: record info */
		DeadPid = pid;
		DeadStatus = w;
		return;
	}

	if ((child = proc_pid(pid)) == NULL)
		return;

	UpdModLine = YES;		/* we're changing state ... */
	if (WIFSTOPPED(w))
		child->p_child_state = C_STOPPED;
	else {
#ifdef PIPEPROCS
		/* the true process status comes by pipe, not from wait().
		 * However, we must note the death of portsrv processes.
		 */
		child->p_portlive = NO;
#else /* !PIPEPROCS */
		/* record the details of the death of the process.
		 * Kludge: see if we can get any queued EOF from pty first.
		 * We wish to do this to make our message less confusing.
		 */
		while (!io_eofed(child)) {
			int	nfds;
			fd_set	reads;
			struct timeval	notime;

			FD_ZERO(&reads);
			FD_SET(child->p_fd, &reads);
			notime.tv_sec = 0;
			notime.tv_usec = 0;
			nfds = select(global_maxfd, &reads,
				(fd_set *)NULL, (fd_set *)NULL, &notime);
			if (nfds == 1)
				read_pty_proc(child->p_fd);
			else if (nfds >= 0 || errno != EINTR) {
# ifdef NO_EOF_FROM_PTY
				/* Certain systems never indicate EOF from a slave.
				 * On those systems, we force a close when the direct
				 * child terminates.
				 */
				proc_close(child);
# endif
				break;
			}
		}
		obituary(child, w);
#endif /* !PIPEPROCS */
	}
}

#ifdef USE_PROTOTYPES
private void
obituary(register Process child, wait_status_t w)
#else
private void
obituary(child, w)
register Process	child;
wait_status_t	w;
#endif
{
	UpdModLine = YES;		/* we're changing state ... */
	if (WIFEXITED(w)) {
		child->p_child_state = C_EXITED;
		child->p_reason = WEXITSTATUS(w);
	} else if (WIFSIGNALED(w)) {
		child->p_child_state = C_KILLED;
		child->p_reason = WTERMSIG(w);
	} else {
		/* presume it died peacefully! */
		child->p_child_state = C_EXITED;
		child->p_reason = 0;
	}

	{
		Buffer	*save = curbuf;
		Bufpos	bp;
		char	mesg[128];

		/* insert status message now */
		swritef(mesg, sizeof(mesg), "[Process %s: %s]\n",
			proc_cmd(child), pstate(child));
		SetBuf(child->p_buffer);
		DOTsave(&bp);
		ToLast();
		ins_str(mesg);
		SetDot(&bp);
		SetBuf(save);
		redisplay();
	}
}

#endif /* IPROCS */
