/*      $OpenBSD: tty.c,v 1.5 2023/03/08 04:43:10 guenther Exp $        */

/*
 * Copyright (c) 2013, Otto Moerbeek <otto@drijf.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <errno.h>
#include <signal.h>
#include <histedit.h>
#include <termios.h>
#include "extern.h"

struct termios ttysaved, ttyedit;

static int
settty(struct termios *t)
{
        int ret;

        while ((ret = tcsetattr(0, TCSADRAIN,  t)) == -1 && errno == EINTR)
                continue;
        return ret;
}

int
gettty(struct termios *t)
{
        int ret;

        while ((ret = tcgetattr(0, t)) == -1 && errno == EINTR)
                continue;
        return ret;
}

void
tstpcont(int sig)
{
        int save_errno = errno;

        if (sig == SIGTSTP) {
                signal(SIGCONT, tstpcont);
                gettty(&ttyedit);
                settty(&ttysaved);      
        } else {
                signal(SIGTSTP, tstpcont);
                settty(&ttyedit);
        }
        signal(sig, SIG_DFL);
        kill(0, sig);
        errno = save_errno;
}