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tty.c revision 1.2 
      1 /*	$NetBSD: tty.c,v 1.2 1997/01/12 19:12:24 tls Exp $	*/
      2 
      3 #include "sh.h"
      4 #include "ksh_stat.h"
      5 #define EXTERN
      6 #include "tty.h"
      7 #undef EXTERN
      8 
      9 int
     10 get_tty(fd, ts)
     11 	int fd;
     12 	TTY_state *ts;
     13 {
     14 	int ret;
     15 
     16 # ifdef HAVE_TERMIOS_H
     17 	ret = tcgetattr(fd, ts);
     18 # else /* HAVE_TERIOS_H */
     19 #  ifdef HAVE_TERMIO_H
     20 	ret = ioctl(fd, TCGETA, ts);
     21 #  else /* HAVE_TERMIO_H */
     22 	ret = ioctl(fd, TIOCGETP, &ts->sgttyb);
     23 #   ifdef TIOCGATC
     24 	if (ioctl(fd, TIOCGATC, &ts->lchars) < 0)
     25 		ret = -1;
     26 #   else
     27 	if (ioctl(fd, TIOCGETC, &ts->tchars) < 0)
     28 		ret = -1;
     29 #    ifdef TIOCGLTC
     30 	if (ioctl(fd, TIOCGLTC, &ts->ltchars) < 0)
     31 		ret = -1;
     32 #    endif /* TIOCGLTC */
     33 #   endif /* TIOCGATC */
     34 #  endif /* HAVE_TERMIO_H */
     35 # endif /* HAVE_TERIOS_H */
     36 	return ret;
     37 }
     38 
     39 int
     40 set_tty(fd, ts, flags)
     41 	int fd;
     42 	TTY_state *ts;
     43 	int flags;
     44 {
     45 	int ret = 0;
     46 
     47 # ifdef HAVE_TERMIOS_H
     48 	ret = tcsetattr(fd, TCSADRAIN, ts);
     49 # else /* HAVE_TERIOS_H */
     50 #  ifdef HAVE_TERMIO_H
     51 #   ifndef TCSETAW				/* e.g. Cray-2 */
     52 		/* first wait for output to drain */
     53 #    ifdef TCSBRK
     54 		if (ioctl(tty_fd, TCSBRK, 1) < 0)
     55 			ret = -1;
     56 #    else /* the following kludge is minimally intrusive, but sometimes fails */
     57 		if (flags & TF_WAIT)
     58 			sleep((unsigned)1);	/* fake it */
     59 #    endif
     60 #   endif /* !TCSETAW */
     61 #   if defined(_BSD_SYSV) || !defined(TCSETAW)
     62 /* _BSD_SYSV must force TIOCSETN instead of TIOCSETP (preserve type-ahead) */
     63 		if (ioctl(tty_fd, TCSETA, ts) < 0)
     64 			ret = -1;
     65 #   else
     66 		if (ioctl(tty_fd, TCSETAW, ts) < 0)
     67 			ret = -1;
     68 #   endif
     69 #  else /* HAVE_TERMIO_H */
     70 #   if defined(__mips) && (defined(_SYSTYPE_BSD43) || defined(__SYSTYPE_BSD43))
     71 	/* Under RISC/os 5.00, bsd43 environment, after a tty driver
     72 	 * generated interrupt (eg, INTR, TSTP), all output to tty is
     73 	 * lost until a SETP is done (there must be a better way of
     74 	 * doing this...).
     75 	 */
     76 	if (flags & TF_MIPSKLUDGE)
     77 		ret = ioctl(fd, TIOCSETP, &ts->sgttyb);
     78 	else
     79 #   endif /* _SYSTYPE_BSD43 */
     80 	    ret = ioctl(fd, TIOCSETN, &ts->sgttyb);
     81 #   ifdef TIOCGATC
     82 	if (ioctl(fd, TIOCSATC, &ts->lchars) < 0)
     83 		ret = -1;
     84 #   else
     85 	if (ioctl(fd, TIOCSETC, &ts->tchars) < 0)
     86 		ret = -1;
     87 #    ifdef TIOCGLTC
     88 	if (ioctl(fd, TIOCSLTC, &ts->ltchars) < 0)
     89 		ret = -1;
     90 #    endif /* TIOCGLTC */
     91 #   endif /* TIOCGATC */
     92 #  endif /* HAVE_TERMIO_H */
     93 # endif /* HAVE_TERIOS_H */
     94 	return ret;
     95 }
     96 
     97 
     98 /* Initialize tty_fd.  Used for saving/reseting tty modes upon
     99  * foreground job completion and for setting up tty process group.
    100  */
    101 void
    102 tty_init(init_ttystate)
    103 	int init_ttystate;
    104 {
    105 	int	do_close = 1;
    106 	int	tfd;
    107 
    108 	if (tty_fd >= 0) {
    109 		close(tty_fd);
    110 		tty_fd = -1;
    111 	}
    112 	tty_devtty = 1;
    113 
    114 	/* SCO can't job control on /dev/tty, so don't try... */
    115 #if !defined(__SCO__)
    116 	if ((tfd = open("/dev/tty", O_RDWR, 0)) < 0) {
    117 #ifdef __NeXT
    118 		/* rlogin on NeXT boxes does not set up the controlling tty,
    119 		 * so force it to be done here...
    120 		 */
    121 		{
    122 			extern char *ttyname ARGS((int));
    123 			char *s = ttyname(isatty(2) ? 2 : 0);
    124 			int fd;
    125 
    126 			if (s && (fd = open(s, O_RDWR, 0)) >= 0) {
    127 				close(fd);
    128 				tfd = open("/dev/tty", O_RDWR, 0);
    129 			}
    130 		}
    131 #endif /* __NeXT */
    132 
    133 /* X11R5 xterm on mips doesn't set controlling tty properly - temporary hack */
    134 # if !defined(__mips) || !(defined(_SYSTYPE_BSD43) || defined(__SYSTYPE_BSD43))
    135 		if (tfd < 0) {
    136 			tty_devtty = 0;
    137 			warningf(FALSE,
    138 				"No controlling tty (open /dev/tty: %s)",
    139 				strerror(errno));
    140 		}
    141 # endif /* __mips  */
    142 	}
    143 #else /* !__SCO__ */
    144 	tfd = -1;
    145 #endif /* __SCO__ */
    146 
    147 	if (tfd < 0) {
    148 		do_close = 0;
    149 		if (isatty(0))
    150 			tfd = 0;
    151 		else if (isatty(2))
    152 			tfd = 2;
    153 		else {
    154 			warningf(FALSE, "Can't find tty file descriptor");
    155 			return;
    156 		}
    157 	}
    158 	if ((tty_fd = ksh_dupbase(tfd, FDBASE)) < 0) {
    159 		warningf(FALSE, "j_ttyinit: dup of tty fd failed: %s",
    160 			strerror(errno));
    161 	} else if (fd_clexec(tty_fd) < 0) {
    162 		warningf(FALSE, "j_ttyinit: can't set close-on-exec flag: %s",
    163 			strerror(errno));
    164 		close(tty_fd);
    165 		tty_fd = -1;
    166 	} else if (init_ttystate)
    167 		get_tty(tty_fd, &tty_state);
    168 	if (do_close)
    169 		close(tfd);
    170 }
    171 
    172 void
    173 tty_close()
    174 {
    175 	if (tty_fd >= 0) {
    176 		close(tty_fd);
    177 		tty_fd = -1;
    178 	}
    179 }
    180