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tty_60.c revision 1.4.8.1 
      1 /*	$NetBSD: tty_60.c,v 1.4.8.1 2017/04/27 05:36:34 pgoyette Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2012 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Alan Barrett
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: tty_60.c,v 1.4.8.1 2017/04/27 05:36:34 pgoyette Exp $");
     34 
     35 #if defined(_KERNEL_OPT)
     36 #include "opt_compat_netbsd.h"
     37 #endif
     38 
     39 #include <sys/types.h>
     40 
     41 #include <sys/conf.h>
     42 #include <sys/errno.h>
     43 #include <sys/systm.h>
     44 
     45 #include <sys/tty.h>
     46 #include <compat/sys/ttycom.h>
     47 
     48 #ifdef COMPAT_60
     49 
     50 /* convert struct ptmget to struct compat_60_ptmget */
     51 static int
     52 ptmget_to_ptmget60(struct ptmget *pg, struct compat_60_ptmget *pg60)
     53 {
     54 	memset(pg60, 0, sizeof(*pg60));
     55 	pg60->cfd = pg->cfd;
     56 	pg60->sfd = pg->sfd;
     57 	strlcpy(pg60->cn, pg->cn, sizeof(pg60->cn));
     58 	strlcpy(pg60->sn, pg->sn, sizeof(pg60->sn));
     59 	if (strlen(pg->cn) >= sizeof(pg60->cn)
     60 	    || strlen(pg->sn) >= sizeof(pg60->sn))
     61 		return E2BIG;
     62 	return 0;
     63 }
     64 
     65 /* Helper for compat ioctls that use struct compat_60_ptmget. */
     66 static int
     67 compat_60_ptmget_ioctl(dev_t dev, u_long cmd, void *data, int flag,
     68 	struct lwp *l)
     69 {
     70 	int ret = 0;
     71 	u_long newcmd;
     72 	struct ptmget pg;
     73 	const struct cdevsw *cd = cdevsw_lookup_acquire(dev);
     74 
     75 	if (cd == NULL)
     76 		return ENXIO;
     77 	if (cd->d_ioctl == NULL) {
     78 		cdevsw_release(cd);
     79 		return ENXIO;
     80 	}
     81 
     82 	switch (cmd) {
     83 	case COMPAT_60_TIOCPTMGET:  newcmd = TIOCPTMGET; break;
     84 	case COMPAT_60_TIOCPTSNAME: newcmd = TIOCPTSNAME; break;
     85 	default: ret = ENOTTY;
     86 	}
     87 	if (ret == 0)
     88 		ret = (cd->d_ioctl)(dev, newcmd, &pg, flag, l);
     89 	if (ret == 0)
     90 		ret = ptmget_to_ptmget60(&pg, data);
     91 	cdevsw_release(cd);
     92 	return ret;
     93 }
     94 
     95 /*
     96  * COMPAT_60 versions of ttioctl and ptmioctl.
     97  */
     98 int
     99 compat_60_ttioctl(struct tty *tp, u_long cmd, void *data, int flag,
    100 	struct lwp *l)
    101 {
    102 
    103 	switch (cmd) {
    104 	case COMPAT_60_TIOCPTMGET:
    105 	case COMPAT_60_TIOCPTSNAME:
    106 		return compat_60_ptmget_ioctl(tp->t_dev, cmd, data, flag, l);
    107 	default:
    108 		return EPASSTHROUGH;
    109 	}
    110 }
    111 
    112 int
    113 compat_60_ptmioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
    114 {
    115 
    116 	switch (cmd) {
    117 	case COMPAT_60_TIOCPTMGET:
    118 		return compat_60_ptmget_ioctl(dev, cmd, data, flag, l);
    119 	default:
    120 		return EPASSTHROUGH;
    121 	}
    122 }
    123 
    124 #endif /* COMPAT_60 */
    125