diff options
Diffstat (limited to 'tty.c')
| -rw-r--r-- | tty.c | 153 |
1 files changed, 153 insertions, 0 deletions
@@ -0,0 +1,153 @@ +/* $NetBSD: tty.c,v 1.9 2017/06/30 04:41:19 kamil Exp $ */ + +#include <sys/cdefs.h> + +#ifndef lint +__RCSID("$NetBSD: tty.c,v 1.9 2017/06/30 04:41:19 kamil Exp $"); +#endif + +#include <sys/stat.h> + +#include "sh.h" +#define EXTERN +#include "tty.h" +#undef EXTERN + +int +get_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; +} + +int +set_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 */ + 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. + */ +void +tty_init(init_ttystate) + int init_ttystate; +{ + int do_close = 1; + int tfd; + const char *devtty = _PATH_TTY; + + if (tty_fd >= 0) { + close(tty_fd); + tty_fd = -1; + } + tty_devtty = 1; + + if ((tfd = open(devtty, O_RDWR, 0)) < 0) { + if (tfd < 0) { + tty_devtty = 0; + warningf(false, + "No controlling tty (open %s: %s)", + devtty, strerror(errno)); + } + } + + 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); +} + +void +tty_close() +{ + if (tty_fd >= 0) { + close(tty_fd); + tty_fd = -1; + } +} |