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/* $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;
}
}
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