/*      $NetBSD: linux_termios.c,v 1.39 2021/11/23 17:54:08 pho Exp $   */

/*-
 * Copyright (c) 1995, 1998, 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Frank van der Linden and Eric Haszlakiewicz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_termios.c,v 1.39 2021/11/23 17:54:08 pho Exp $");

#if defined(_KERNEL_OPT)
#include "opt_ptm.h"
#endif

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/termios.h>
#include <sys/kernel.h>

#include <sys/syscallargs.h>

#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_ioctl.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_util.h>
#include <compat/linux/common/linux_termios.h>
#include <compat/linux/common/linux_ipc.h>
#include <compat/linux/common/linux_sem.h>

#include <compat/linux/linux_syscallargs.h>

#ifdef DEBUG_LINUX
#define DPRINTF(a)      uprintf a
#else
#define DPRINTF(a)
#endif

int
linux_ioctl_termios(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(u_long) com;
                syscallarg(void *) data;
        } */
        file_t *fp;
        u_long com;
        struct linux_termio tmplt;
        struct linux_termios tmplts;
        struct termios tmpbts;
        int idat;
        struct sys_ioctl_args ia;
        int error;
        char tioclinux;
        int (*bsdioctl)(file_t *, u_long, void *);

        if ((fp = fd_getfile(SCARG(uap, fd))) == NULL)
                return (EBADF);

        if ((fp->f_flag & (FREAD | FWRITE)) == 0) {
                error = EBADF;
                goto out;
        }

        bsdioctl = fp->f_ops->fo_ioctl;
        com = SCARG(uap, com);
        retval[0] = 0;

        switch (com) {
        case LINUX_TCGETS:
                error = (*bsdioctl)(fp, TIOCGETA, &tmpbts);
                if (error)
                        goto out;
                bsd_termios_to_linux_termios(&tmpbts, &tmplts);
                error = copyout(&tmplts, SCARG(uap, data), sizeof tmplts);
                goto out;
        case LINUX_TCSETS:
        case LINUX_TCSETSW:
        case LINUX_TCSETSF:
                /*
                 * First fill in all fields, so that we keep the current
                 * values for fields that Linux doesn't know about.
                 */
                error = (*bsdioctl)(fp, TIOCGETA, &tmpbts);
                if (error)
                        goto out;
                error = copyin(SCARG(uap, data), &tmplts, sizeof tmplts);
                if (error)
                        goto out;
                linux_termios_to_bsd_termios(&tmplts, &tmpbts);
                switch (com) {
                case LINUX_TCSETS:
                        com = TIOCSETA;
                        break;
                case LINUX_TCSETSW:
                        com = TIOCSETAW;
                        break;
                case LINUX_TCSETSF:
                        com = TIOCSETAF;
                        break;
                }
                error = (*bsdioctl)(fp, com, &tmpbts);
                goto out;
        case LINUX_TCGETA:
                error = (*bsdioctl)(fp, TIOCGETA, &tmpbts);
                if (error)
                        goto out;
                bsd_termios_to_linux_termio(&tmpbts, &tmplt);
                error = copyout(&tmplt, SCARG(uap, data), sizeof tmplt);
                goto out;
        case LINUX_TCSETA:
        case LINUX_TCSETAW:
        case LINUX_TCSETAF:
                /*
                 * First fill in all fields, so that we keep the current
                 * values for fields that Linux doesn't know about.
                 */
                error = (*bsdioctl)(fp, TIOCGETA, &tmpbts);
                if (error)
                        goto out;
                error = copyin(SCARG(uap, data), &tmplt, sizeof tmplt);
                if (error)
                        goto out;
                linux_termio_to_bsd_termios(&tmplt, &tmpbts);
                switch (com) {
                case LINUX_TCSETA:
                        com = TIOCSETA;
                        break;
                case LINUX_TCSETAW:
                        com = TIOCSETAW;
                        break;
                case LINUX_TCSETAF:
                        com = TIOCSETAF;
                        break;
                }
                error = (*bsdioctl)(fp, com, &tmpbts);
                goto out;
        case LINUX_TCFLSH:
                switch((u_long)SCARG(uap, data)) {
                case 0:
                        idat = FREAD;
                        break;
                case 1:
                        idat = FWRITE;
                        break;
                case 2:
                        idat = 0;
                        break;
                default:
                        error = EINVAL;
                        goto out;
                }
                error = (*bsdioctl)(fp, TIOCFLUSH, &idat);
                goto out;
        case LINUX_TIOCGETD:
                error = (*bsdioctl)(fp, TIOCGETD, &idat);
                if (error)
                        goto out;
                switch (idat) {
                case TTYDISC:
                        idat = LINUX_N_TTY;
                        break;
                case SLIPDISC:
                        idat = LINUX_N_SLIP;
                        break;
                case PPPDISC:
                        idat = LINUX_N_PPP;
                        break;
                case STRIPDISC:
                        idat = LINUX_N_STRIP;
                        break;
                /*
                 * Linux does not have the tablet line discipline.
                 */
                case TABLDISC:
                default:
                        idat = -1;      /* XXX What should this be? */
                        break;
                }
                error = copyout(&idat, SCARG(uap, data), sizeof idat);
                goto out;
        case LINUX_TIOCSETD:
                error = copyin(SCARG(uap, data), &idat, sizeof idat);
                if (error)
                        goto out;
                switch (idat) {
                case LINUX_N_TTY:
                        idat = TTYDISC;
                        break;
                case LINUX_N_SLIP:
                        idat = SLIPDISC;
                        break;
                case LINUX_N_PPP:
                        idat = PPPDISC;
                        break;
                case LINUX_N_STRIP:
                        idat = STRIPDISC;
                        break;
                /*
                 * We can't handle the mouse line discipline Linux has.
                 */
                case LINUX_N_MOUSE:
                case LINUX_N_AX25:
                case LINUX_N_X25:
                case LINUX_N_6PACK:
                default:
                        error = EINVAL;
                        goto out;
                }
                error = (*bsdioctl)(fp, TIOCSETD, &idat);
                goto out;
        case LINUX_TIOCLINUX:
                error = copyin(SCARG(uap, data), &tioclinux, sizeof tioclinux);
                if (error != 0)
                        goto out;
                switch (tioclinux) {
                case LINUX_TIOCLINUX_KERNMSG:
                        /*
                         * XXX needed to not fail for some things. Could
                         * try to use TIOCCONS, but the char argument
                         * specifies the VT #, not an fd.
                         */
                        error = 0;
                        goto out;
                case LINUX_TIOCLINUX_COPY:
                case LINUX_TIOCLINUX_PASTE:
                case LINUX_TIOCLINUX_UNBLANK:
                case LINUX_TIOCLINUX_LOADLUT:
                case LINUX_TIOCLINUX_READSHIFT:
                case LINUX_TIOCLINUX_READMOUSE:
                case LINUX_TIOCLINUX_VESABLANK:
                case LINUX_TIOCLINUX_CURCONS:   /* could use VT_GETACTIVE */
                default:
                        error = EINVAL;
                        goto out;
                }
                break;
        case LINUX_TIOCGWINSZ:
                SCARG(&ia, com) = TIOCGWINSZ;
                break;
        case LINUX_TIOCSWINSZ:
                SCARG(&ia, com) = TIOCSWINSZ;
                break;
        case LINUX_TIOCGPGRP:
                SCARG(&ia, com) = TIOCGPGRP;
                break;
        case LINUX_TIOCSPGRP:
                SCARG(&ia, com) = TIOCSPGRP;
                break;
        case LINUX_FIOCLEX:
                SCARG(&ia, com) = FIOCLEX;
                break;
        case LINUX_FIONCLEX:
                SCARG(&ia, com) = FIONCLEX;
                break;
        case LINUX_FIONREAD:
                SCARG(&ia, com) = FIONREAD;
                break;
        case LINUX_FIONBIO:
                SCARG(&ia, com) = FIONBIO;
                break;
        case LINUX_FIOASYNC:
                SCARG(&ia, com) = FIOASYNC;
                break;
        case LINUX_TIOCEXCL:
                SCARG(&ia, com) = TIOCEXCL;
                break;
        case LINUX_TIOCNXCL:
                SCARG(&ia, com) = TIOCNXCL;
                break;
        case LINUX_TIOCCONS:
                SCARG(&ia, com) = TIOCCONS;
                break;
        case LINUX_TIOCNOTTY:
                SCARG(&ia, com) = TIOCNOTTY;
                break;
        case LINUX_TCSBRK:
                idat = (u_long)SCARG(uap, data);
                if (idat != 0)
                        SCARG(&ia, com) = TIOCDRAIN;
                else {
                        if ((error = (*bsdioctl)(fp, TIOCSBRK, NULL)) != 0)
                                goto out;
                        error = tsleep(&idat, PZERO | PCATCH, "linux_tcsbrk", hz / 4);
                        if (error == EINTR || error == ERESTART) {
                                (void)(*bsdioctl)(fp, TIOCCBRK, NULL);
                                error = EINTR;
                        } else
                                error = (*bsdioctl)(fp, TIOCCBRK, NULL);
                        goto out;
                }
                break;
        case LINUX_TIOCMGET:
                SCARG(&ia, com) = TIOCMGET;
                break;
        case LINUX_TIOCMSET:
                SCARG(&ia, com) = TIOCMSET;
                break;
        case LINUX_TIOCMBIC:
                SCARG(&ia, com) = TIOCMBIC;
                break;
        case LINUX_TIOCMBIS:
                SCARG(&ia, com) = TIOCMBIS;
                break;
#ifdef LINUX_TIOCGPTN
        case LINUX_TIOCGPTN:
#ifndef NO_DEV_PTM
                {
                        struct ptmget ptm;

                        error = (*bsdioctl)(fp, TIOCPTSNAME, &ptm);
                        if (error != 0)
                                goto out;
                        error = copyout(&ptm.sfd, SCARG(uap, data),
                            sizeof(ptm.sfd));
                        goto out;
                }
#endif /* NO_DEV_PTM */
#endif /* LINUX_TIOCGPTN */
#ifdef LINUX_TIOCSPTLCK
        case LINUX_TIOCSPTLCK:
                        fd_putfile(SCARG(uap, fd));
                        error = copyin(SCARG(uap, data), &idat, sizeof(idat));
                        if (error)
                                return error;
                        DPRINTF(("TIOCSPTLCK %d\n", idat));
                        return 0;
#endif
        case LINUX_TCXONC:
                idat = (u_long)SCARG(uap, data);
                switch (idat) {
                case LINUX_TCOOFF:
                        SCARG(&ia, com) = TIOCSTOP;
                        break;
                case LINUX_TCOON:
                        SCARG(&ia, com) = TIOCSTART;
                        break;
                case LINUX_TCIOFF:
                case LINUX_TCION:
                default:
                        error = EINVAL;
                        goto out;
                }
                break;
        default:
                error = EINVAL;
                goto out;
        }

        SCARG(&ia, fd) = SCARG(uap, fd);
        SCARG(&ia, data) = SCARG(uap, data);
        error = sys_ioctl(curlwp, &ia, retval);
out:
        fd_putfile(SCARG(uap, fd));
        return error;
}