/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include "sh.h"#include "ksh_stat.h"#define EXTERN#include "tty.h"#undef EXTERN intget_tty(fd, ts)	int fd;	TTY_state *ts;{	int ret; # ifdef HAVE_TERMIOS_H	ret = tcgetattr(fd, ts);# else /* HAVE_TERIOS_H */#  ifdef HAVE_TERMIO_H	ret = ioctl(fd, TCGETA, ts);#  else /* HAVE_TERMIO_H */	ret = ioctl(fd, TIOCGETP, &ts->sgttyb);#   ifdef TIOCGATC	if (ioctl(fd, TIOCGATC, &ts->lchars) < 0)		ret = -1;#   else	if (ioctl(fd, TIOCGETC, &ts->tchars) < 0)		ret = -1;#    ifdef TIOCGLTC	if (ioctl(fd, TIOCGLTC, &ts->ltchars) < 0)		ret = -1;#    endif /* TIOCGLTC */#   endif /* TIOCGATC */#  endif /* HAVE_TERMIO_H */# endif /* HAVE_TERIOS_H */	return ret;} intset_tty(fd, ts, flags)	int fd;	TTY_state *ts;	int flags;{	int ret = 0; # ifdef HAVE_TERMIOS_H	ret = tcsetattr(fd, TCSADRAIN, ts);# else /* HAVE_TERIOS_H */#  ifdef HAVE_TERMIO_H#   ifndef TCSETAW				/* e.g. Cray-2 */		/* first wait for output to drain */#    ifdef TCSBRK		if (ioctl(tty_fd, TCSBRK, 1) < 0)			ret = -1;#    else /* the following kludge is minimally intrusive, but sometimes fails */		if (flags & TF_WAIT)			sleep((unsigned)1);	/* fake it */#    endif#   endif /* !TCSETAW */#   if defined(_BSD_SYSV) || !defined(TCSETAW)/* _BSD_SYSV must force TIOCSETN instead of TIOCSETP (preserve type-ahead) */		if (ioctl(tty_fd, TCSETA, ts) < 0)			ret = -1;#   else		if (ioctl(tty_fd, TCSETAW, ts) < 0)			ret = -1;#   endif#  else /* HAVE_TERMIO_H */#   if defined(__mips) && (defined(_SYSTYPE_BSD43) || defined(__SYSTYPE_BSD43))	/* Under RISC/os 5.00, bsd43 environment, after a tty driver	 * generated interrupt (eg, INTR, TSTP), all output to tty is	 * lost until a SETP is done (there must be a better way of	 * doing this...).	 */	if (flags & TF_MIPSKLUDGE)		ret = ioctl(fd, TIOCSETP, &ts->sgttyb);	else#   endif /* _SYSTYPE_BSD43 */	    ret = ioctl(fd, TIOCSETN, &ts->sgttyb);#   ifdef TIOCGATC	if (ioctl(fd, TIOCSATC, &ts->lchars) < 0)		ret = -1;#   else	if (ioctl(fd, TIOCSETC, &ts->tchars) < 0)		ret = -1;#    ifdef TIOCGLTC	if (ioctl(fd, TIOCSLTC, &ts->ltchars) < 0)		ret = -1;#    endif /* TIOCGLTC */#   endif /* TIOCGATC */#  endif /* HAVE_TERMIO_H */# endif /* HAVE_TERIOS_H */	return ret;}  /* Initialize tty_fd.  Used for saving/reseting tty modes upon * foreground job completion and for setting up tty process group. */voidtty_init(init_ttystate)	int init_ttystate;{	int	do_close = 1;	int	tfd; 	if (tty_fd >= 0) {		close(tty_fd);		tty_fd = -1;	}	tty_devtty = 1; 	/* SCO can't job control on /dev/tty, so don't try... */#if !defined(__SCO__) && !defined(PLAN9)	if ((tfd = open("/dev/tty", O_RDWR, 0)) < 0) {#ifdef __NeXT		/* rlogin on NeXT boxes does not set up the controlling tty,		 * so force it to be done here...		 */		{			extern char *ttyname ARGS((int));			char *s = ttyname(isatty(2) ? 2 : 0);			int fd; 			if (s && (fd = open(s, O_RDWR, 0)) >= 0) {				close(fd);				tfd = open("/dev/tty", O_RDWR, 0);			}		}#endif /* __NeXT */ /* X11R5 xterm on mips doesn't set controlling tty properly - temporary hack */# if !defined(__mips) || !(defined(_SYSTYPE_BSD43) || defined(__SYSTYPE_BSD43))		if (tfd < 0) {			tty_devtty = 0;			warningf(FALSE,				"No controlling tty (open /dev/tty: %s)",				strerror(errno));		}# endif /* __mips  */	}#else /* !__SCO__ */	tfd = -1;#endif /* __SCO__ */ 	if (tfd < 0) {		do_close = 0;		if (isatty(0))			tfd = 0;		else if (isatty(2))			tfd = 2;		else {			warningf(FALSE, "Can't find tty file descriptor");			return;		}	}	if ((tty_fd = ksh_dupbase(tfd, FDBASE)) < 0) {		warningf(FALSE, "j_ttyinit: dup of tty fd failed: %s",			strerror(errno));	} else if (fd_clexec(tty_fd) < 0) {		warningf(FALSE, "j_ttyinit: can't set close-on-exec flag: %s",			strerror(errno));		close(tty_fd);		tty_fd = -1;	} else if (init_ttystate)		get_tty(tty_fd, &tty_state);	if (do_close)		close(tfd);} voidtty_close(){	if (tty_fd >= 0) {		close(tty_fd);		tty_fd = -1;	}}