bin/ksh/tty.c

   1 /*      $NetBSD: tty.c,v 1.4 2003/06/23 11:39:06 agc Exp $      */
   2
   3 #include <sys/cdefs.h>
   4
   5 #ifndef lint
   6 __RCSID("$NetBSD: tty.c,v 1.4 2003/06/23 11:39:06 agc Exp $");
   7 #endif
   8
   9
  10 #include "sh.h"
  11 #include "ksh_stat.h"
  12 #define EXTERN
  13 #include "tty.h"
  14 #undef EXTERN
  15
  16 int
  17 get_tty(fd, ts)
  18         int fd;
  19         TTY_state *ts;
  20 {
  21         int ret;
  22
  23 # ifdef HAVE_TERMIOS_H
  24         ret = tcgetattr(fd, ts);
  25 # else /* HAVE_TERIOS_H */
  26 #  ifdef HAVE_TERMIO_H
  27         ret = ioctl(fd, TCGETA, ts);
  28 #  else /* HAVE_TERMIO_H */
  29         ret = ioctl(fd, TIOCGETP, &ts->sgttyb);
  30 #   ifdef TIOCGATC
  31         if (ioctl(fd, TIOCGATC, &ts->lchars) < 0)
  32                 ret = -1;
  33 #   else
  34         if (ioctl(fd, TIOCGETC, &ts->tchars) < 0)
  35                 ret = -1;
  36 #    ifdef TIOCGLTC
  37         if (ioctl(fd, TIOCGLTC, &ts->ltchars) < 0)
  38                 ret = -1;
  39 #    endif /* TIOCGLTC */
  40 #   endif /* TIOCGATC */
  41 #  endif /* HAVE_TERMIO_H */
  42 # endif /* HAVE_TERIOS_H */
  43         return ret;
  44 }
  45
  46 int
  47 set_tty(fd, ts, flags)
  48         int fd;
  49         TTY_state *ts;
  50         int flags;
  51 {
  52         int ret = 0;
  53
  54 # ifdef HAVE_TERMIOS_H
  55         ret = tcsetattr(fd, TCSADRAIN, ts);
  56 # else /* HAVE_TERIOS_H */
  57 #  ifdef HAVE_TERMIO_H
  58 #   ifndef TCSETAW                              /* e.g. Cray-2 */
  59                 /* first wait for output to drain */
  60 #    ifdef TCSBRK
  61                 if (ioctl(tty_fd, TCSBRK, 1) < 0)
  62                         ret = -1;
  63 #    else /* the following kludge is minimally intrusive, but sometimes fails */
  64                 if (flags & TF_WAIT)
  65                         sleep((unsigned)1);     /* fake it */
  66 #    endif
  67 #   endif /* !TCSETAW */
  68 #   if defined(_BSD_SYSV) || !defined(TCSETAW)
  69 /* _BSD_SYSV must force TIOCSETN instead of TIOCSETP (preserve type-ahead) */
  70                 if (ioctl(tty_fd, TCSETA, ts) < 0)
  71                         ret = -1;
  72 #   else
  73                 if (ioctl(tty_fd, TCSETAW, ts) < 0)
  74                         ret = -1;
  75 #   endif
  76 #  else /* HAVE_TERMIO_H */
  77 #   if defined(__mips) && (defined(_SYSTYPE_BSD43) || defined(__SYSTYPE_BSD43))
  78         /* Under RISC/os 5.00, bsd43 environment, after a tty driver
  79          * generated interrupt (eg, INTR, TSTP), all output to tty is
  80          * lost until a SETP is done (there must be a better way of
  81          * doing this...).
  82          */
  83         if (flags & TF_MIPSKLUDGE)
  84                 ret = ioctl(fd, TIOCSETP, &ts->sgttyb);
  85         else
  86 #   endif /* _SYSTYPE_BSD43 */
  87             ret = ioctl(fd, TIOCSETN, &ts->sgttyb);
  88 #   ifdef TIOCGATC
  89         if (ioctl(fd, TIOCSATC, &ts->lchars) < 0)
  90                 ret = -1;
  91 #   else
  92         if (ioctl(fd, TIOCSETC, &ts->tchars) < 0)
  93                 ret = -1;
  94 #    ifdef TIOCGLTC
  95         if (ioctl(fd, TIOCSLTC, &ts->ltchars) < 0)
  96                 ret = -1;
  97 #    endif /* TIOCGLTC */
  98 #   endif /* TIOCGATC */
  99 #  endif /* HAVE_TERMIO_H */
 100 # endif /* HAVE_TERIOS_H */
 101         return ret;
 102 }
 103
 104
 105 /* Initialize tty_fd.  Used for saving/reseting tty modes upon
 106  * foreground job completion and for setting up tty process group.
 107  */
 108 void
 109 tty_init(init_ttystate)
 110         int init_ttystate;
 111 {
 112         int     do_close = 1;
 113         int     tfd;
 114         const char      *devtty = _PATH_TTY;
 115
 116         if (tty_fd >= 0) {
 117                 close(tty_fd);
 118                 tty_fd = -1;
 119         }
 120         tty_devtty = 1;
 121
 122         /* SCO can't job control on /dev/tty, so don't try... */
 123 #if !defined(__SCO__)
 124         if ((tfd = open(devtty, O_RDWR, 0)) < 0) {
 125 #ifdef __NeXT
 126                 /* rlogin on NeXT boxes does not set up the controlling tty,
 127                  * so force it to be done here...
 128                  */
 129                 {
 130                         extern char *ttyname ARGS((int));
 131                         char *s = ttyname(isatty(2) ? 2 : 0);
 132                         int fd;
 133
 134                         if (s && (fd = open(s, O_RDWR, 0)) >= 0) {
 135                                 close(fd);
 136                                 tfd = open(devtty, O_RDWR, 0);
 137                         }
 138                 }
 139 #endif /* __NeXT */
 140
 141 /* X11R5 xterm on mips doesn't set controlling tty properly - temporary hack */
 142 # if !defined(__mips) || !(defined(_SYSTYPE_BSD43) || defined(__SYSTYPE_BSD43))
 143                 if (tfd < 0) {
 144                         tty_devtty = 0;
 145                         warningf(FALSE,
 146                                 "No controlling tty (open %s: %s)",
 147                                 devtty, strerror(errno));
 148                 }
 149 # endif /* __mips  */
 150         }
 151 #else /* !__SCO__ */
 152         tfd = -1;
 153 #endif /* __SCO__ */
 154
 155         if (tfd < 0) {
 156                 do_close = 0;
 157                 if (isatty(0))
 158                         tfd = 0;
 159                 else if (isatty(2))
 160                         tfd = 2;
 161                 else {
 162                         warningf(FALSE, "Can't find tty file descriptor");
 163                         return;
 164                 }
 165         }
 166         if ((tty_fd = ksh_dupbase(tfd, FDBASE)) < 0) {
 167                 warningf(FALSE, "j_ttyinit: dup of tty fd failed: %s",
 168                         strerror(errno));
 169         } else if (fd_clexec(tty_fd) < 0) {
 170                 warningf(FALSE, "j_ttyinit: can't set close-on-exec flag: %s",
 171                         strerror(errno));
 172                 close(tty_fd);
 173                 tty_fd = -1;
 174         } else if (init_ttystate)
 175                 get_tty(tty_fd, &tty_state);
 176         if (do_close)
 177                 close(tfd);
 178 }
 179
 180 void
 181 tty_close()
 182 {
 183         if (tty_fd >= 0) {
 184                 close(tty_fd);
 185                 tty_fd = -1;
 186         }
 187 }