evdev.c - platform/external/strace.git - Git at Google

 /*
  * Copyright (c) 2015 Etienne Gemsa <etienne.gemsa@lse.epita.fr>
  * Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
  * Copyright (c) 2015-2018 The strace developers.
  * All rights reserved.
  *
  * 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.
  * 3. The name of the author may not be used to endorse or promote products
  *    derived from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "defs.h"

 #include "xlat/evdev_abs.h"
 #include "xlat/evdev_ev.h"

 #ifdef HAVE_LINUX_INPUT_H

 # include <linux/ioctl.h>
 # include <linux/input.h>

 # include "xlat/evdev_autorepeat.h"
 # include "xlat/evdev_ff_status.h"
 # include "xlat/evdev_ff_types.h"
 # include "xlat/evdev_keycode.h"
 # include "xlat/evdev_leds.h"
 # include "xlat/evdev_misc.h"
 # include "xlat/evdev_mtslots.h"
 # include "xlat/evdev_prop.h"
 # include "xlat/evdev_relative_axes.h"
 # include "xlat/evdev_snd.h"
 # include "xlat/evdev_switch.h"

 # ifndef SYN_MAX
 #  define SYN_MAX 0xf
 # endif

 const size_t evdev_abs_size = ARRAY_SIZE(evdev_abs) - 1;

 static int
 abs_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
 {
 	tprints(", ");

 	struct input_absinfo absinfo;

 	if (!umove_or_printaddr(tcp, arg, &absinfo)) {
 		tprintf("{value=%u"
 			", minimum=%u, ",
 			absinfo.value,
 			absinfo.minimum);

 		if (!abbrev(tcp)) {
 			tprintf("maximum=%u"
 				", fuzz=%u"
 				", flat=%u",
 				absinfo.maximum,
 				absinfo.fuzz,
 				absinfo.flat);
 # ifdef HAVE_STRUCT_INPUT_ABSINFO_RESOLUTION
 			tprintf(", resolution=%u",
 				absinfo.resolution);
 # endif
 		} else {
 			tprints("...");
 		}

 		tprints("}");
 	}

 	return RVAL_IOCTL_DECODED;
 }

 static int
 keycode_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
 {
 	tprints(", ");

 	unsigned int keycode[2];

 	if (!umove_or_printaddr(tcp, arg, &keycode)) {
 		tprintf("[%u, ", keycode[0]);
 		printxval_index(evdev_keycode, keycode[1], "KEY_???");
 		tprints("]");
 	}

 	return RVAL_IOCTL_DECODED;
 }

 # ifdef EVIOCGKEYCODE_V2
 static int
 keycode_V2_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
 {
 	tprints(", ");

 	struct input_keymap_entry ike;

 	if (umove_or_printaddr(tcp, arg, &ike))
 		return RVAL_IOCTL_DECODED;

 	tprintf("{flags=%" PRIu8
 		", len=%" PRIu8 ", ",
 		ike.flags,
 		ike.len);

 	if (!abbrev(tcp)) {
 		unsigned int i;

 		tprintf("index=%" PRIu16 ", keycode=", ike.index);
 		printxval_index(evdev_keycode, ike.keycode, "KEY_???");
 		tprints(", scancode=[");
 		for (i = 0; i < ARRAY_SIZE(ike.scancode); i++) {
 			if (i > 0)
 				tprints(", ");
 			tprintf("%" PRIx8, ike.scancode[i]);
 		}
 		tprints("]");
 	} else {
 		tprints("...");
 	}

 	tprints("}");

 	return RVAL_IOCTL_DECODED;
 }
 # endif /* EVIOCGKEYCODE_V2 */

 static int
 getid_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
 {
 	tprints(", ");

 	struct input_id id;

 	if (!umove_or_printaddr(tcp, arg, &id))
 		tprintf("{ID_BUS=%" PRIu16
 			", ID_VENDOR=%" PRIu16
 			", ID_PRODUCT=%" PRIu16
 			", ID_VERSION=%" PRIu16 "}",
 			id.bustype,
 			id.vendor,
 			id.product,
 			id.version);

 	return RVAL_IOCTL_DECODED;
 }

 static int
 decode_bitset_(struct tcb *const tcp, const kernel_ulong_t arg,
 	       const struct xlat decode_nr[], const unsigned int max_nr,
 	       const char *const dflt, size_t decode_nr_size, enum xlat_type xt)
 {
 	tprints(", ");

 	unsigned int size;
 	if ((kernel_ulong_t) tcp->u_rval > max_nr / 8)
 		size = max_nr;
 	else
 		size = tcp->u_rval * 8;
 	char decoded_arg[size];

 	if (umove_or_printaddr(tcp, arg, &decoded_arg))
 		return RVAL_IOCTL_DECODED;

 	tprints("[");

 	int bit_displayed = 0;
 	int i = next_set_bit(decoded_arg, 0, size);
 	if (i < 0) {
 		tprints(" 0 ");
 	} else {
 		printxval_dispatch(decode_nr, decode_nr_size, i, dflt, xt);

 		while ((i = next_set_bit(decoded_arg, i + 1, size)) > 0) {
 			if (abbrev(tcp) && bit_displayed >= 3) {
 				tprints(", ...");
 				break;
 			}
 			tprints(", ");
 			printxval_dispatch(decode_nr, decode_nr_size, i, dflt,
 					   xt);
 			bit_displayed++;
 		}
 	}

 	tprints("]");

 	return RVAL_IOCTL_DECODED;
 }

 #define decode_bitset(tcp_, arg_, decode_nr_, max_nr_, dflt_, xt_) \
 	decode_bitset_((tcp_), (arg_), (decode_nr_), (max_nr_), \
 		       (dflt_), ARRAY_SIZE(decode_nr_), (xt_))

 # ifdef EVIOCGMTSLOTS
 static int
 mtslots_ioctl(struct tcb *const tcp, const unsigned int code,
 	      const kernel_ulong_t arg)
 {
 	tprints(", ");

 	const size_t size = _IOC_SIZE(code) / sizeof(int);
 	if (!size) {
 		printaddr(arg);
 		return RVAL_IOCTL_DECODED;
 	}

 	int buffer[size];

 	if (umove_or_printaddr(tcp, arg, &buffer))
 		return RVAL_IOCTL_DECODED;

 	tprints("{code=");
 	printxval(evdev_mtslots, buffer[0], "ABS_MT_???");

 	tprints(", values=[");

 	unsigned int i;
 	for (i = 1; i < ARRAY_SIZE(buffer); i++)
 		tprintf("%s%d", i > 1 ? ", " : "", buffer[i]);

 	tprints("]}");

 	return RVAL_IOCTL_DECODED;
 }
 # endif /* EVIOCGMTSLOTS */

 # if defined EVIOCGREP || defined EVIOCSREP
 static int
 repeat_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
 {
 	tprints(", ");
 	printpair_int(tcp, arg, "%u");
 	return RVAL_IOCTL_DECODED;
 }
 # endif /* EVIOCGREP || EVIOCSREP */

 static int
 bit_ioctl(struct tcb *const tcp, const unsigned int ev_nr,
 	  const kernel_ulong_t arg)
 {
 	switch (ev_nr) {
 		case 0:
 			return decode_bitset(tcp, arg, evdev_ev,
 					     EV_MAX, "EV_???", XT_SORTED);
 		case EV_KEY:
 			return decode_bitset(tcp, arg, evdev_keycode,
 					     KEY_MAX, "KEY_???", XT_INDEXED);
 		case EV_REL:
 			return decode_bitset(tcp, arg, evdev_relative_axes,
 					     REL_MAX, "REL_???", XT_INDEXED);
 		case EV_ABS:
 			return decode_bitset(tcp, arg, evdev_abs,
 					     ABS_MAX, "ABS_???", XT_INDEXED);
 		case EV_MSC:
 			return decode_bitset(tcp, arg, evdev_misc,
 					     MSC_MAX, "MSC_???", XT_INDEXED);
 		case EV_SW:
 			return decode_bitset(tcp, arg, evdev_switch,
 					     SW_MAX, "SW_???", XT_INDEXED);
 		case EV_LED:
 			return decode_bitset(tcp, arg, evdev_leds,
 					     LED_MAX, "LED_???", XT_INDEXED);
 		case EV_SND:
 			return decode_bitset(tcp, arg, evdev_snd,
 					     SND_MAX, "SND_???", XT_INDEXED);
 		case EV_REP:
 			return decode_bitset(tcp, arg, evdev_autorepeat,
 					     REP_MAX, "REP_???", XT_INDEXED);
 		case EV_FF:
 			return decode_bitset(tcp, arg, evdev_ff_types,
 					     FF_MAX, "FF_???", XT_SORTED);
 		case EV_PWR:
 			tprints(", ");
 			printnum_int(tcp, arg, "%d");
 			return RVAL_IOCTL_DECODED;
 		case EV_FF_STATUS:
 			return decode_bitset(tcp, arg, evdev_ff_status,
 					     FF_STATUS_MAX, "FF_STATUS_???",
 					     XT_INDEXED);
 		default:
 			tprints(", ");
 			printaddr(arg);
 			return RVAL_IOCTL_DECODED;
 	}
 }

 static int
 evdev_read_ioctl(struct tcb *const tcp, const unsigned int code,
 		 const kernel_ulong_t arg)
 {
 	/* fixed-number fixed-length commands */
 	switch (code) {
 		case EVIOCGVERSION:
 			tprints(", ");
 			printnum_int(tcp, arg, "%#x");
 			return RVAL_IOCTL_DECODED;
 		case EVIOCGEFFECTS:
 			tprints(", ");
 			printnum_int(tcp, arg, "%u");
 			return RVAL_IOCTL_DECODED;
 		case EVIOCGID:
 			return getid_ioctl(tcp, arg);
 # ifdef EVIOCGREP
 		case EVIOCGREP:
 			return repeat_ioctl(tcp, arg);
 # endif
 		case EVIOCGKEYCODE:
 			return keycode_ioctl(tcp, arg);
 # ifdef EVIOCGKEYCODE_V2
 		case EVIOCGKEYCODE_V2:
 			return keycode_V2_ioctl(tcp, arg);
 # endif
 	}

 	/* fixed-number variable-length commands */
 	switch (_IOC_NR(code)) {
 # ifdef EVIOCGMTSLOTS
 		case _IOC_NR(EVIOCGMTSLOTS(0)):
 			return mtslots_ioctl(tcp, code, arg);
 # endif
 		case _IOC_NR(EVIOCGNAME(0)):
 		case _IOC_NR(EVIOCGPHYS(0)):
 		case _IOC_NR(EVIOCGUNIQ(0)):
 			tprints(", ");
 			if (syserror(tcp))
 				printaddr(arg);
 			else
 				printstrn(tcp, arg, tcp->u_rval);
 			return RVAL_IOCTL_DECODED;
 # ifdef EVIOCGPROP
 		case _IOC_NR(EVIOCGPROP(0)):
 			return decode_bitset(tcp, arg, evdev_prop,
 					     INPUT_PROP_MAX, "PROP_???",
 					     XT_INDEXED);
 # endif
 		case _IOC_NR(EVIOCGSND(0)):
 			return decode_bitset(tcp, arg, evdev_snd,
 					     SND_MAX, "SND_???", XT_INDEXED);
 # ifdef EVIOCGSW
 		case _IOC_NR(EVIOCGSW(0)):
 			return decode_bitset(tcp, arg, evdev_switch,
 					     SW_MAX, "SW_???", XT_INDEXED);
 # endif
 		case _IOC_NR(EVIOCGKEY(0)):
 			return decode_bitset(tcp, arg, evdev_keycode,
 					     KEY_MAX, "KEY_???", XT_INDEXED);
 		case _IOC_NR(EVIOCGLED(0)):
 			return decode_bitset(tcp, arg, evdev_leds,
 					     LED_MAX, "LED_???", XT_INDEXED);
 	}

 	/* multi-number fixed-length commands */
 	if ((_IOC_NR(code) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0)))
 		return abs_ioctl(tcp, arg);

 	/* multi-number variable-length commands */
 	if ((_IOC_NR(code) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
 		return bit_ioctl(tcp, _IOC_NR(code) & EV_MAX, arg);

 	return 0;
 }

 static int
 evdev_write_ioctl(struct tcb *const tcp, const unsigned int code,
 		  const kernel_ulong_t arg)
 {
 	/* fixed-number fixed-length commands */
 	switch (code) {
 # ifdef EVIOCSREP
 		case EVIOCSREP:
 			return repeat_ioctl(tcp, arg);
 # endif
 		case EVIOCSKEYCODE:
 			return keycode_ioctl(tcp, arg);
 # ifdef EVIOCSKEYCODE_V2
 		case EVIOCSKEYCODE_V2:
 			return keycode_V2_ioctl(tcp, arg);
 # endif
 		case EVIOCRMFF:
 			tprintf(", %d", (int) arg);
 			return RVAL_IOCTL_DECODED;
 		case EVIOCGRAB:
 # ifdef EVIOCREVOKE
 		case EVIOCREVOKE:
 # endif
 			tprintf(", %" PRI_klu, arg);
 			return RVAL_IOCTL_DECODED;
 # ifdef EVIOCSCLOCKID
 		case EVIOCSCLOCKID:
 			tprints(", ");
 			printnum_int(tcp, arg, "%u");
 			return RVAL_IOCTL_DECODED;
 # endif
 		default: {
 			int rc = evdev_write_ioctl_mpers(tcp, code, arg);

 			if (rc != RVAL_DECODED)
 				return rc;
 		}
 	}

 	/* multi-number fixed-length commands */
 	if ((_IOC_NR(code) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0)))
 		return abs_ioctl(tcp, arg);

 	return 0;
 }

 void
 print_evdev_ff_type(const kernel_ulong_t val)
 {
 	printxval(evdev_ff_types, val, "FF_???");
 }

 int
 evdev_ioctl(struct tcb *const tcp,
 	    const unsigned int code, const kernel_ulong_t arg)
 {
 	switch (_IOC_DIR(code)) {
 		case _IOC_READ:
 			if (entering(tcp))
 				return 0;
 			return evdev_read_ioctl(tcp, code, arg);
 		case _IOC_WRITE:
 			return evdev_write_ioctl(tcp, code, arg) | RVAL_DECODED;
 		default:
 			return RVAL_DECODED;
 	}
 }

 #endif /* HAVE_LINUX_INPUT_H */
	/*
	* Copyright (c) 2015 Etienne Gemsa <etienne.gemsa@lse.epita.fr>
	* Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
	* Copyright (c) 2015-2018 The strace developers.
	* All rights reserved.
	*
	* 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.
	* 3. The name of the author may not be used to endorse or promote products
	* derived from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "defs.h"

	#include "xlat/evdev_abs.h"
	#include "xlat/evdev_ev.h"

	#ifdef HAVE_LINUX_INPUT_H

	# include <linux/ioctl.h>
	# include <linux/input.h>

	# include "xlat/evdev_autorepeat.h"
	# include "xlat/evdev_ff_status.h"
	# include "xlat/evdev_ff_types.h"
	# include "xlat/evdev_keycode.h"
	# include "xlat/evdev_leds.h"
	# include "xlat/evdev_misc.h"
	# include "xlat/evdev_mtslots.h"
	# include "xlat/evdev_prop.h"
	# include "xlat/evdev_relative_axes.h"
	# include "xlat/evdev_snd.h"
	# include "xlat/evdev_switch.h"

	# ifndef SYN_MAX
	# define SYN_MAX 0xf
	# endif

	const size_t evdev_abs_size = ARRAY_SIZE(evdev_abs) - 1;

	static int
	abs_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
	{
	tprints(", ");

	struct input_absinfo absinfo;

	if (!umove_or_printaddr(tcp, arg, &absinfo)) {
	tprintf("{value=%u"
	", minimum=%u, ",
	absinfo.value,
	absinfo.minimum);

	if (!abbrev(tcp)) {
	tprintf("maximum=%u"
	", fuzz=%u"
	", flat=%u",
	absinfo.maximum,
	absinfo.fuzz,
	absinfo.flat);
	# ifdef HAVE_STRUCT_INPUT_ABSINFO_RESOLUTION
	tprintf(", resolution=%u",
	absinfo.resolution);
	# endif
	} else {
	tprints("...");
	}

	tprints("}");
	}

	return RVAL_IOCTL_DECODED;
	}

	static int
	keycode_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
	{
	tprints(", ");

	unsigned int keycode[2];

	if (!umove_or_printaddr(tcp, arg, &keycode)) {
	tprintf("[%u, ", keycode[0]);
	printxval_index(evdev_keycode, keycode[1], "KEY_???");
	tprints("]");
	}

	return RVAL_IOCTL_DECODED;
	}

	# ifdef EVIOCGKEYCODE_V2
	static int
	keycode_V2_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
	{
	tprints(", ");

	struct input_keymap_entry ike;

	if (umove_or_printaddr(tcp, arg, &ike))
	return RVAL_IOCTL_DECODED;

	tprintf("{flags=%" PRIu8
	", len=%" PRIu8 ", ",
	ike.flags,
	ike.len);

	if (!abbrev(tcp)) {
	unsigned int i;

	tprintf("index=%" PRIu16 ", keycode=", ike.index);
	printxval_index(evdev_keycode, ike.keycode, "KEY_???");
	tprints(", scancode=[");
	for (i = 0; i < ARRAY_SIZE(ike.scancode); i++) {
	if (i > 0)
	tprints(", ");
	tprintf("%" PRIx8, ike.scancode[i]);
	}
	tprints("]");
	} else {
	tprints("...");
	}

	tprints("}");

	return RVAL_IOCTL_DECODED;
	}
	# endif /* EVIOCGKEYCODE_V2 */

	static int
	getid_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
	{
	tprints(", ");

	struct input_id id;

	if (!umove_or_printaddr(tcp, arg, &id))
	tprintf("{ID_BUS=%" PRIu16
	", ID_VENDOR=%" PRIu16
	", ID_PRODUCT=%" PRIu16
	", ID_VERSION=%" PRIu16 "}",
	id.bustype,
	id.vendor,
	id.product,
	id.version);

	return RVAL_IOCTL_DECODED;
	}

	static int
	decode_bitset_(struct tcb *const tcp, const kernel_ulong_t arg,
	const struct xlat decode_nr[], const unsigned int max_nr,
	const char *const dflt, size_t decode_nr_size, enum xlat_type xt)
	{
	tprints(", ");

	unsigned int size;
	if ((kernel_ulong_t) tcp->u_rval > max_nr / 8)
	size = max_nr;
	else
	size = tcp->u_rval * 8;
	char decoded_arg[size];

	if (umove_or_printaddr(tcp, arg, &decoded_arg))
	return RVAL_IOCTL_DECODED;

	tprints("[");

	int bit_displayed = 0;
	int i = next_set_bit(decoded_arg, 0, size);
	if (i < 0) {
	tprints(" 0 ");
	} else {
	printxval_dispatch(decode_nr, decode_nr_size, i, dflt, xt);

	while ((i = next_set_bit(decoded_arg, i + 1, size)) > 0) {
	if (abbrev(tcp) && bit_displayed >= 3) {
	tprints(", ...");
	break;
	}
	tprints(", ");
	printxval_dispatch(decode_nr, decode_nr_size, i, dflt,
	xt);
	bit_displayed++;
	}
	}

	tprints("]");

	return RVAL_IOCTL_DECODED;
	}

	#define decode_bitset(tcp_, arg_, decode_nr_, max_nr_, dflt_, xt_) \
	decode_bitset_((tcp_), (arg_), (decode_nr_), (max_nr_), \
	(dflt_), ARRAY_SIZE(decode_nr_), (xt_))

	# ifdef EVIOCGMTSLOTS
	static int
	mtslots_ioctl(struct tcb *const tcp, const unsigned int code,
	const kernel_ulong_t arg)
	{
	tprints(", ");

	const size_t size = _IOC_SIZE(code) / sizeof(int);
	if (!size) {
	printaddr(arg);
	return RVAL_IOCTL_DECODED;
	}

	int buffer[size];

	if (umove_or_printaddr(tcp, arg, &buffer))
	return RVAL_IOCTL_DECODED;

	tprints("{code=");
	printxval(evdev_mtslots, buffer[0], "ABS_MT_???");

	tprints(", values=[");

	unsigned int i;
	for (i = 1; i < ARRAY_SIZE(buffer); i++)
	tprintf("%s%d", i > 1 ? ", " : "", buffer[i]);

	tprints("]}");

	return RVAL_IOCTL_DECODED;
	}
	# endif /* EVIOCGMTSLOTS */

	# if defined EVIOCGREP \|\| defined EVIOCSREP
	static int
	repeat_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
	{
	tprints(", ");
	printpair_int(tcp, arg, "%u");
	return RVAL_IOCTL_DECODED;
	}
	# endif /* EVIOCGREP \|\| EVIOCSREP */

	static int
	bit_ioctl(struct tcb *const tcp, const unsigned int ev_nr,
	const kernel_ulong_t arg)
	{
	switch (ev_nr) {
	case 0:
	return decode_bitset(tcp, arg, evdev_ev,
	EV_MAX, "EV_???", XT_SORTED);
	case EV_KEY:
	return decode_bitset(tcp, arg, evdev_keycode,
	KEY_MAX, "KEY_???", XT_INDEXED);
	case EV_REL:
	return decode_bitset(tcp, arg, evdev_relative_axes,
	REL_MAX, "REL_???", XT_INDEXED);
	case EV_ABS:
	return decode_bitset(tcp, arg, evdev_abs,
	ABS_MAX, "ABS_???", XT_INDEXED);
	case EV_MSC:
	return decode_bitset(tcp, arg, evdev_misc,
	MSC_MAX, "MSC_???", XT_INDEXED);
	case EV_SW:
	return decode_bitset(tcp, arg, evdev_switch,
	SW_MAX, "SW_???", XT_INDEXED);
	case EV_LED:
	return decode_bitset(tcp, arg, evdev_leds,
	LED_MAX, "LED_???", XT_INDEXED);
	case EV_SND:
	return decode_bitset(tcp, arg, evdev_snd,
	SND_MAX, "SND_???", XT_INDEXED);
	case EV_REP:
	return decode_bitset(tcp, arg, evdev_autorepeat,
	REP_MAX, "REP_???", XT_INDEXED);
	case EV_FF:
	return decode_bitset(tcp, arg, evdev_ff_types,
	FF_MAX, "FF_???", XT_SORTED);
	case EV_PWR:
	tprints(", ");
	printnum_int(tcp, arg, "%d");
	return RVAL_IOCTL_DECODED;
	case EV_FF_STATUS:
	return decode_bitset(tcp, arg, evdev_ff_status,
	FF_STATUS_MAX, "FF_STATUS_???",
	XT_INDEXED);
	default:
	tprints(", ");
	printaddr(arg);
	return RVAL_IOCTL_DECODED;
	}
	}

	static int
	evdev_read_ioctl(struct tcb *const tcp, const unsigned int code,
	const kernel_ulong_t arg)
	{
	/* fixed-number fixed-length commands */
	switch (code) {
	case EVIOCGVERSION:
	tprints(", ");
	printnum_int(tcp, arg, "%#x");
	return RVAL_IOCTL_DECODED;
	case EVIOCGEFFECTS:
	tprints(", ");
	printnum_int(tcp, arg, "%u");
	return RVAL_IOCTL_DECODED;
	case EVIOCGID:
	return getid_ioctl(tcp, arg);
	# ifdef EVIOCGREP
	case EVIOCGREP:
	return repeat_ioctl(tcp, arg);
	# endif
	case EVIOCGKEYCODE:
	return keycode_ioctl(tcp, arg);
	# ifdef EVIOCGKEYCODE_V2
	case EVIOCGKEYCODE_V2:
	return keycode_V2_ioctl(tcp, arg);
	# endif
	}

	/* fixed-number variable-length commands */
	switch (_IOC_NR(code)) {
	# ifdef EVIOCGMTSLOTS
	case _IOC_NR(EVIOCGMTSLOTS(0)):
	return mtslots_ioctl(tcp, code, arg);
	# endif
	case _IOC_NR(EVIOCGNAME(0)):
	case _IOC_NR(EVIOCGPHYS(0)):
	case _IOC_NR(EVIOCGUNIQ(0)):
	tprints(", ");
	if (syserror(tcp))
	printaddr(arg);
	else
	printstrn(tcp, arg, tcp->u_rval);
	return RVAL_IOCTL_DECODED;
	# ifdef EVIOCGPROP
	case _IOC_NR(EVIOCGPROP(0)):
	return decode_bitset(tcp, arg, evdev_prop,
	INPUT_PROP_MAX, "PROP_???",
	XT_INDEXED);
	# endif
	case _IOC_NR(EVIOCGSND(0)):
	return decode_bitset(tcp, arg, evdev_snd,
	SND_MAX, "SND_???", XT_INDEXED);
	# ifdef EVIOCGSW
	case _IOC_NR(EVIOCGSW(0)):
	return decode_bitset(tcp, arg, evdev_switch,
	SW_MAX, "SW_???", XT_INDEXED);
	# endif
	case _IOC_NR(EVIOCGKEY(0)):
	return decode_bitset(tcp, arg, evdev_keycode,
	KEY_MAX, "KEY_???", XT_INDEXED);
	case _IOC_NR(EVIOCGLED(0)):
	return decode_bitset(tcp, arg, evdev_leds,
	LED_MAX, "LED_???", XT_INDEXED);
	}

	/* multi-number fixed-length commands */
	if ((_IOC_NR(code) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0)))
	return abs_ioctl(tcp, arg);

	/* multi-number variable-length commands */
	if ((_IOC_NR(code) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
	return bit_ioctl(tcp, _IOC_NR(code) & EV_MAX, arg);

	return 0;
	}

	static int
	evdev_write_ioctl(struct tcb *const tcp, const unsigned int code,
	const kernel_ulong_t arg)
	{
	/* fixed-number fixed-length commands */
	switch (code) {
	# ifdef EVIOCSREP
	case EVIOCSREP:
	return repeat_ioctl(tcp, arg);
	# endif
	case EVIOCSKEYCODE:
	return keycode_ioctl(tcp, arg);
	# ifdef EVIOCSKEYCODE_V2
	case EVIOCSKEYCODE_V2:
	return keycode_V2_ioctl(tcp, arg);
	# endif
	case EVIOCRMFF:
	tprintf(", %d", (int) arg);
	return RVAL_IOCTL_DECODED;
	case EVIOCGRAB:
	# ifdef EVIOCREVOKE
	case EVIOCREVOKE:
	# endif
	tprintf(", %" PRI_klu, arg);
	return RVAL_IOCTL_DECODED;
	# ifdef EVIOCSCLOCKID
	case EVIOCSCLOCKID:
	tprints(", ");
	printnum_int(tcp, arg, "%u");
	return RVAL_IOCTL_DECODED;
	# endif
	default: {
	int rc = evdev_write_ioctl_mpers(tcp, code, arg);

	if (rc != RVAL_DECODED)
	return rc;
	}
	}

	/* multi-number fixed-length commands */
	if ((_IOC_NR(code) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0)))
	return abs_ioctl(tcp, arg);

	return 0;
	}

	void
	print_evdev_ff_type(const kernel_ulong_t val)
	{
	printxval(evdev_ff_types, val, "FF_???");
	}

	int
	evdev_ioctl(struct tcb *const tcp,
	const unsigned int code, const kernel_ulong_t arg)
	{
	switch (_IOC_DIR(code)) {
	case _IOC_READ:
	if (entering(tcp))
	return 0;
	return evdev_read_ioctl(tcp, code, arg);
	case _IOC_WRITE:
	return evdev_write_ioctl(tcp, code, arg) \| RVAL_DECODED;
	default:
	return RVAL_DECODED;
	}
	}

	#endif /* HAVE_LINUX_INPUT_H */