tty.c

#include <sys/stat.h>
#include "sh.h"
#define EXTERN
#include "tty.h"
#undef EXTERN

#ifdef AMIGA
#define TIOCGETP 1
#define TIOCGETC 2
#define TIOCSETN 3
#define TIOCSETC 4
#endif

/* Initialize tty_fd.  Used for saving/reseting tty modes upon
 * foreground job completion and for setting up tty process group.
 */
void
tty_init(int init_ttystate)
{
        int        do_close = 1;
        int        tfd;

        if (tty_fd >= 0) {
                close(tty_fd);
                tty_fd = -1;
        }
        tty_devtty = 1;

#ifdef AMIGA
        if ((tfd = open("CONSOLE:", O_RDWR, 0)) < 0) {
#else
        if ((tfd = open("/dev/tty", O_RDWR, 0)) < 0) {
#endif
                tty_devtty = 0;
                warningf(false, "No controlling tty (open /dev/tty: %s)",
                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 = fcntl(tfd, F_DUPFD, FDBASE)) < 0) {
                warningf(false, "j_ttyinit: dup of tty fd failed: %s",
                    strerror(errno));
#ifndef __amigaos4__
        } else if (fcntl(tty_fd, F_SETFD, FD_CLOEXEC) < 0) {
                warningf(false, "j_ttyinit: can't set close-on-exec flag: %s",
                    strerror(errno));
                close(tty_fd);
                tty_fd = -1;
#endif
        } else if (init_ttystate)
                tcgetattr(tty_fd, &tty_state);
        if (do_close)
                close(tfd);
}

void
tty_close(void)
{
        if (tty_fd >= 0) {
                close(tty_fd);
                tty_fd = -1;
        }
}